The MC3410 is a low-noise, integrated digital output 3-axis accelerometer with a feature set optimized for cell phones and consumer product motion sensing.
Applications include user interface control, gaming motion input, electronic compass tilt compensation for cell phones, game controllers, remote controls and portable media products.
Accurate event detection is enabled with a low noise architecture that minimizes false triggering found in competing devices. Low noise and low power are inherent in the monolithic fabrication approach, where the MEMS accelerometer is integrated in a single-chip with the electronics integrated circuit.
In the MC3410 the internal sample rate is fixed at 1024 samples / second. Specific orientation and gesture conditions can trigger an interrupt to a remote MCU. Alternatively, the device supports the reading of sample and event status via polling.
MC3410 3-Axis Accelerometer
FEATURES
Range, Sampling & Power
Preliminary Datasheet
± 2g / ± 4g / ± 8g ranges 10-bit or 14-bit resolution 1024 samples/sec
Programmable low pass filter
‒ From 8 to 512 Hz bandwidth
200 μA active current
Event Detection
Low-noise architecture minimizes
false triggering Tap, Shake, Drop
Portrait or landscape orientation with programmable hysteresis
Tilt detection in six orientations
Simple System Integration
I2C interface, up to 400 kHz 2 × 2 × 0.92 mm 12-pin package ‒ Pin-compatible to Bosch BMA2xx Single-chip 3D silicon MEMS
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MC3410 3-Axis Accelerometer
Preliminary Datasheet
TABLE OF CONTENTS
1 2 3
3.1 3.2 3.3
Order Information ............................................................................................................. 5 Functional Block Diagram ................................................................................................ 6 Packaging and Pin Description ........................................................................................ 7
Package Outline ................................................................................................................... 7 Pin Description ..................................................................................................................... 8 Typical Application Circuit .................................................................................................... 9
4
4.1 4.2 4.3
Specifications ................................................................................................................. 10
Absolute Maximum Ratings ................................................................................................ 10 Sensor Characteristics ....................................................................................................... 11 Electrical and Timing Characteristics .................................................................................. 12
4.3.1 4.3.2 4.3.3 5
5.1 5.2
Electrical Power and Internal Characteristics ....................................................... 12 I2C Electrical Characteristics ............................................................................... 13 I2C Timing Characteristics ................................................................................... 14
Sensor Sampling ................................................................................................................ 15 Offset and Gain Calibration ................................................................................................ 16
General Operation ......................................................................................................... 15
6 7 8
8.1 8.2 8.3 8.4
Operational States ......................................................................................................... 17 Operational State Flow .................................................................................................. 18 Interrupts ........................................................................................................................ 19
Enabling and Clearing Interrupts ........................................................................................ 19 Interrupt Support ................................................................................................................ 20 GINT Interrupt .................................................................................................................... 21 Event Detection .................................................................................................................. 22
9
9.1 9.2 9.3 9.4 9.5
Orientation Detection ..................................................................................................... 23
Orientation Hysteresis ........................................................................................................ 23 Portrait/Landscape Events ................................................................................................. 23 Front/Back Events .............................................................................................................. 28 Shake Detection ................................................................................................................. 30 Drop Detection ................................................................................................................... 32
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MC3410 3-Axis Accelerometer
9.6 9.7
Preliminary Datasheet Tap Detection ..................................................................................................................... 33 Continuous Sampling ......................................................................................................... 35
10 I2C Interface .................................................................................................................. 36
Physical Interface ............................................................................................................... 36 Timing ................................................................................................................................ 36 I2C Message Format .......................................................................................................... 36 Register Summary ............................................................................................................. 39 TILT: Status Register ......................................................................................................... 41 OPSTAT: Operational State Status Register ...................................................................... 43 INTEN: Interrupt Enable Register ....................................................................................... 44 MODE: Register ................................................................................................................. 45 TAPEN: Tap Detection Enable Register ............................................................................. 46 TAPP: Tap Pulse Register ................................................................................................. 47 DROP: Drop Event Control Register .................................................................................. 48 SHDB: Shake Debounce Register ...................................................................................... 49 XOUT_EX, YOUT_EX & ZOUT_EX: X, Y, Z-Axis Extended Accelerometer Registers ....... 50 CHIPID: Chip Identification Register ................................................................................... 51 OUTCFG: Output Configuration Register ........................................................................... 52 X-Axis Offset Registers ...................................................................................................... 53 Y-Axis Offset Registers ...................................................................................................... 54 Z-Axis Offset Registers ...................................................................................................... 55 X-Axis Gain Registers ........................................................................................................ 56 Y-Axis Gain Registers ........................................................................................................ 57 Z-Axis Gain Registers ........................................................................................................ 58 SHAKE_TH: Shake Threshold Register ............................................................................. 59 UD_Z_TH: Up/Down Z Axis Threshold Register ................................................................. 60 UD_X_TH: Up/Down X Axis Threshold Register ................................................................ 61 RL_Z_TH: Right/Left Z Axis Threshold Register ................................................................. 62 RL_Y_TH: Right/Left Y Axis Threshold Register ................................................................ 63 FB_Z_TH: Front/Back Z Axis Threshold Register ............................................................... 64 DROP_TH: Drop Threshold Register ................................................................................. 65 TAP_TH: Tap Threshold Register ...................................................................................... 66 PCODE: Product Code....................................................................................................... 67
10.1 10.2 10.3
11 Register Interface .......................................................................................................... 38
11.1 11.2 11.3 11.4 11.5 11.6 11.7 11.8 11.9 11.10 11.11 11.12 11.13 11.14 11.15 11.16 11.17 11.18 11.19 11.20 11.21 11.22 11.23 11.24 11.25 11.26 11.27
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MC3410 3-Axis Accelerometer 12 13 14 15
Preliminary Datasheet Example MC3410 Configuration .................................................................................... 68
Example: Shake, Tap & Drop thresholds Demo ................................................................. 68
12.1
Index of Tables .............................................................................................................. 70 Revision History ............................................................................................................. 72 Legal .............................................................................................................................. 73
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MC3410 3-Axis Accelerometer Preliminary Datasheet 1 ORDER INFORMATION Part Number MC3410 Resolution 10 or 14-bit Order Number MC3410-I5 Package VLGA-12 Shipping Tape & Reel, 5Ku Table 1. Order Information mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer Preliminary Datasheet 2 FUNCTIONAL BLOCK DIAGRAM AVDDRegulatorDVDDBias GeneratorOscillator/Clock GeneratorTESTMode LogicSensorsXC to VA/D Converter(Sigma Delta)Offset/Gain AdjustOrientationand Detection LogicX,Y,Z data pathsInterrupt DetectionVarious eventsRange, ResolutionINTNSCLI2C Slave InterfaceSDARegisters(64 x 8)YC to VA/D Converter(Sigma Delta)Offset/Gain Adjust10-bitXOUT_EX, YOUT_EX, ZOUT_EXGNDZC to VA/D Converter(Sigma Delta)Offset/Gain Adjust14-bitLPF[2:0]OTP MemoryVPP Figure 1. Block Diagram mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer Preliminary Datasheet 3 PACKAGING AND PIN DESCRIPTION 3.1 PACKAGE OUTLINE 0.10D0.10A12 11INDEX AREA12E109875 6SIDE VIEW340.10TOP VIEWbL143ee1SYMBOL// DIMENSION (MM)MIN.0.85NOM.0.922.00 BSC2.00 BSC0.5 BSC0.5125 REF0.200.050.2250.250.100.2750.300.150.325MAX.1.007b56 A D E e e1 b L1L89102L11L12110.100.10CC LPIN 1 MARKBOTTOM VIEW0.08 Figure 2. Package Outline and Mechanical Dimensions NOTE: Additional packaging information and device orientation can be found in Section 11.2 TILT: Status Register. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer 3.2 PIN DESCRIPTION Pin 1 2 3 4 5 6 7 8 9 10 11 12 Table 2. Pin Description Preliminary Datasheet Name NC SDA 1 DVDD NC INTN 2 VPP AVDD NC GND TEST NC SCL 1 Function No connect I2C serial data input/output I/O power supply No connect Interrupt active LOW 3 Connect to GND Analog power supply No Connect Ground Optional probe pin No connect I2C serial clock input Notes: 1) This pin requires a pull-up resistor, typically 4.7kΩ to DVDD. Refer to I2C Specification for Fast-Mode devices. Higher resistance values can be used (typically done to reduce current leakage) but such applications are outside the scope of this datasheet. 2) This pin can be configured by software to operate either as an open-drain output or push-pull output (MODE: Register). If set to open-drain, then it requires a pull-up resistor, typically 4.7kΩ to DVDD. 3) INTN pin polarity is programmable in the MODE: Register. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer Preliminary Datasheet 3.3 TYPICAL APPLICATION CIRCUIT To Fast-Mode I2C circuitry1From interface power supplyPlace cap closeto DVDD and GND on PCB(optional) To MCU interrupt input20.1uFNOTE1: Attach typical 4.7kΩ pullup resistors to DVDD, per I2C specification. When DVDD is powered down, SDA and SCL will be driven low by internal ESD diodes.NOTE2: Attach typical 4.7kΩ pullup resistor if INTN is defined as open-drain.Figure 3. Typical Application Circuit In typical applications, the interface power supply may contain significant noise from external sources and other circuits which should be kept away from the sensor. Therefore, for some applications a lower-noise power supply might be desirable to power the AVDD pin. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved.
}NCSDADVDDNCSCL NCTESTGNDNCAVDD0.1uFINTN VPPPlace cap closeto AVDD and GND on PCBFrom lower-noise power supplyAPS-048-0010v1.3
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MC3410 3-Axis Accelerometer Preliminary Datasheet 4 SPECIFICATIONS 4.1 ABSOLUTE MAXIMUM RATINGS Parameters exceeding the Absolute Maximum Ratings may permanently damage the device. Rating Supply Voltages Acceleration, any axis, 100 µs Ambient operating temperature Storage temperature ESD human body model Latch-up current at Top = 25 ⁰C Input voltage to non-power pin Table 3. Absolute Maximum Ratings Symbol Pins DVDD and AVDD g MAX TOP TSTG HBM ILU Minimum / Maximum Value -0.3 / +3.6 10000 -40 / +85 -40 / +125 ± 2000 100 Unit V g ⁰C ⁰C V mA V Pins INTN, SCL -0.3 / (DVDD + 0.3) or 3.6 and SDA whichever is lower mCube Proprietary and Confidential.
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MC3410 3-Axis Accelerometer 4.2 SENSOR CHARACTERISTICS Preliminary Datasheet DVDD, AVDD = 2.8V, Top = 25 ⁰C unless otherwise noted Parameter Conditions Resolution and range set in OUTCFG: Output Configuration Register Min Typ ±2.0 ±4.0 ±8.0 256 128 64 1024 ± 0.02 ± 100 1 200 1 1 Max Unit Acceleration range g 259 130 65 1035 %/⁰C mg mg/⁰C μg/√Hz % FS % LSB/g Sensitivity 1 S10 (±2.0g 10-bit resolution) S10 (±4.0g 10-bit resolution) S10 (±8.0g 10-bit resolution) S14 (±8.0g 14-bit resolution) 2 253 126 63 1013 Sensitivity Temperature Drift 1 Zero-g Offset Zero-g Offset Temperature Drift 1 Noise Density 1 Nonlinearity 1 Cross-axis Sensitivity 1 Table 4. Sensor Characteristics -40 ≤ Top ≤ +85 ⁰C -40 ≤ Top ≤ +85 ⁰C Between any two axes 1 Values are based on device characterization, not tested in production. Benefits of 14-bit resolution are only realized with appropriate bandwidth settings. 2mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer Preliminary Datasheet 4.3 ELECTRICAL AND TIMING CHARACTERISTICS 4.3.1 ELECTRICAL POWER AND INTERNAL CHARACTERISTICS Parameter Supply voltage2 I/O voltage2 Sample Rate Tolerance 3Conditions Symbol AVDD DVDD Tclock Min Typ Max 2.0 1.7 -5 3.6 3.6 5 Unit V V % Test condition: AVDD = DVDD = 2.8V, Top = 25 ⁰C unless otherwise noted Parameter Standby current WAKE state supply current Pad Leakage Table 5. Electrical Characteristics Conditions Per I/O pad Symbol Idd0 I dd1024 I pad Min Typ Max -1 150 0.01 3 250 1 Unit μA μA μA 23 : Min and Max limits are hard limits without additional tolerance. : Values are based on device characterization, not tested in production. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer Preliminary Datasheet 4.3.2 I2C ELECTRICAL CHARACTERISTICS Parameter LOW level input voltage HIGH level input voltage Hysteresis of Schmitt trigger inputs Output voltage, pin INTN, Iol ≤ 2 mA Output voltage, pin SDA (open drain), Iol ≤ 1 mA Input current, pins SDA and SCL (input voltage between 0.1*DVDD and 0.9*DVDD max) Capacitance, pins SDA and SCL 4 Table 6. I2C Electrical and Timing Characteristics Symbol VIL VIH Vhys Vol Voh Vols Ii Ci Min -0.5 0.7*DVDD 0.05*DVDD 0 0 - -10 - Max 0.3*DVDD - - 0.4 0.9*DVDD 0.1*DVDD 10 10 Unit V V V V V V µA pF NOTES: If multiple slaves are connected to the I2C signals in addition to this device, only 1 pull-up resistor on each of SDA and SCL should exist. Also, care must be taken to not violate the I2C specification for capacitive loading. When DVDD is not powered and set to 0V, INTN, SDA and SCL will be held to DVDD plus the forward voltage of the internal static protection diodes, typically about 0.6V. When DVDD is disconnected from power or ground (e.g. Hi-Z), the device may become inadvertently powered up through the ESD diodes present on other powered signals. 4 : Values are based on device characterization, not tested in production. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer 4.3.3 I2C TIMING CHARACTERISTICS Preliminary Datasheet Figure 4. I2C Interface Timing Standard Mode Parameter fSCL tHD; STA tLOW tHIGH tSU;STA tHD;DAT tSU;DAT tSU;STO tBUF Fast Mode Min 0 0.6 1.3 0.6 0.6 - 100 0.6 1.3 Description SCL clock frequency Hold time (repeated) START condition LOW period of the SCL clock HIGH period of the SCL clock Set-up time for a repeated START condition Data hold time Data set-up time Set-up time for STOP condition Bus free time between a STOP and START Min 0 4.0 4.7 4.0 4.7 5.0 250 4.0 4.7 Max 100 - - - - - - - - Max 400 - - - - - - - - Units kHz μs μs μs μs μs ns μs μs Table 7. I2C Timing Characteristics NOTE: Values are based on I2C Specification requirements, not tested in production. See also Section 10.3 I2C Message Format. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer Preliminary Datasheet 5 GENERAL OPERATION The internal sampling rate range is fixed at 1024 samples per second. The resulting sensor readings appear as either 10-bit or 14-bit values, depending upon the selection chosen. 5.1 SENSOR SAMPLING Measurement data is stored in the “extended” registers XOUT_EX, YOUT_EX, and ZOUT_EX. The byte with the lower address of the byte pair is the least significant byte while the byte with the next higher address is the most significant byte. The 10-bit or 14-bit measurement is represented as 2’s complement format. 10-bit samples occupy bits [9:0], with bits [15:9] occupied by the sign bit. 14-bit samples occupy bits [13:0], with bits [15:13] occupied by the sign bit. The desired resolution and full scale acceleration range of ± 2g, ± 4g or ± 8g are set in OUTCFG: Output Configuration Register. The device sample rate is fixed at 1024 samples/second. The features Tap, Shake, Drop and Orientation detection are available. Acceleration Resolution 10-bit 10-bit 10-bit Range ± 2g ± 4g ± 8g Value Full Scale Full Scale per bit Negative Positive (mg/LSB) Reading Reading ~3.9 ~7.8 ~15.6 0xFE00 (-512) 0x01FF (+511) Comments Signed, 2’s complement number, results in registers XOUT_EX_L, XOUT_EX_H YOUT_EX_L, YOUT_EX_H ZOUT_EX_L, ZOUT_EX_H (Sign-extended. Integer interpretation also shown) Signed, 2’s complement number, results in registers XOUT_EX_L, XOUT_EX_H YOUT_EX_L, YOUT_EX_H ZOUT_EX_L, ZOUT_EX_H (Sign-extended. Integer interpretation also shown) 14-bit ± 8g ~0.98 0xE000 (-8192) 0x1FFF (+8191) Table 8. Summary of Resolution, Range, and Scaling Based upon the intended application, filtering of the data samples may be desired. The device has several low-pass filter (LPF) options for the raw sample data, intended to filter out mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved.
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MC3410 3-Axis Accelerometer Preliminary Datasheet undesired high frequency components. Related to this LPF setting is the GINT interrupt rate, which can be modified to occur based upon the LPF roll-off frequency, rather than the sample rate (fixed at 1024 samples / second). See Section 8.2 GINT Interrupt for more on this option. The cutoff points for the LPF can be set from 8Hz to 512 Hz. These, and the controls for the GINT rate, are described in Section 11.12 OUTCFG: Output Configuration Register. 5.2 OFFSET AND GAIN CALIBRATION Digital offset and gain calibration can be performed on the sensor, if necessary, in order to reduce the effects of post-assembly influences and stresses which may cause the sensor readings to be offset from their factory values. The register controls are described in Sections 11.13 through 11.18. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer Preliminary Datasheet 6 OPERATIONAL STATES The device has two states of operation: STANDBY (the default state after power-up), and WAKE. The STANDBY state offers the lowest power consumption. In this state, the I2C interface is active and all register reads and writes are allowed. There is no event detection, sampling, or acceleration measurement in the STANDBY state. Internal clocking is halted. Complete access to the register set is allowed in this state, but interrupts cannot be serviced. The device defaults to the STANDBY state following power-up. The time to change states from STANDBY to WAKE is less than 10uSec and does not depend upon the sample rate. Registers can be written (and therefore resolution, range. thresholds and other settings changed) only when the device is in STANDBY state. The I2C interface allows write access to all registers only in the STANDBY state. In WAKE state, the only I2C register write access permitted is to the MODE: Register. Full read access is allowed in all states. State I2C Bus Description Device is powered; Registers can be accessed via I2C. Lowest power state. No interrupt generation, internal clocking disabled. Default power-on state. Device responds to STANDBY I2C bus (R/W) WAKE Device responds to Continuous sampling and reading of sense data. All registers except I2C bus (Read) the MODE: Register are read-only. Table 9. Operational States mCube Proprietary and Confidential.
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MC3410 3-Axis Accelerometer Preliminary Datasheet 7 OPERATIONAL STATE FLOW Figure 5. Operational State Flow shows the operational state flow for the device. The device defaults to STANDBY following power-on. WAKEOPCON=11OPCON=01STANDBY Figure 5. Operational State Flow The operational state may be forced to a specific state by writing into the OPCON bits, as shown below. Two bits are specified in order to promote software compatibility with other mCube devices. The operational state will stay in the mode specified until changed: Action Force Wake State Force Standby State Setting OPCON[1:0] = 01 OPCON[1:0] = 11 Effect Switch to WAKE state and stay there Continuous sampling Switch to STANDBY state and stay there Disable sensor and event sampling Table 10. Forcing Operational States mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer Preliminary Datasheet 8 INTERRUPTS The sensor device utilizes output pin INTN to signal to an external microprocessor that an event has been sensed. The microprocessor would contain an interrupt service routine which would perform certain tasks after receiving this interrupt and reading the associated status bits, perhaps after the product was put into a certain orientation or had been tapped. The microprocessor would set up the registers in the sensor so that when a specific event is detected, the microprocessor would receive the interrupt and the interrupt service routine would be executed. For products that will instead use polling, the method of reading sensor data would be slightly different. Instead of receiving an interrupt when an event occurs, the microprocessor must periodically poll the sensor and read status data while the INTN pin is not used. For most applications this is likely best done at the sensor sampling rate or faster. Note that at least one I2C STOP condition must be present between samples in order for the sensor to update the sample data registers. In this case, the event detection bits (TAPD, SHAKED, DROPD) and associated interrupt enable bits in the TILT: Status Register must still be set up as if interrupts would occur in order for the status registers to be updated with proper data. Although the INTN is not connected, the registers in the sensor will still contain valid status and so can be used by software to know the orientation of the product or if an event has occurred. 8.1 ENABLING AND CLEARING INTERRUPTS The INTEN: Interrupt Enable Register determines which events generate interrupts. When an event is detected, it is masked with an interrupt enable bit in this register and the corresponding status bit is set in the TILT: Status Register. Multiple interrupt events might be reported at the same time in the TILT: Status Register, so software must interpret and prioritize the results. The pin INTN is cleared during the next I2C bus cycle after the device ID has been recognized by the device. When an interrupt is triggered, the first I2C read access to the device clears INTN pin. The condition (TAPD, SHAKED, DROPD) that generated the interrupt will remain held in the TILT: Status Register until it is read. Note that the orientation bit-fields POLA and BAFR are continuously updated (every sample) in the TILT: Status Register and are not held. Note that multiple interrupts may be active at the same time, and so a software routine reading the TILT: Status Register should account for this. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer Preliminary Datasheet Any of the following interrupts can be enabled or disabled in the INTEN: Interrupt Enable Register and DROP: Drop Event Control Register. ‒ Front/Back Interrupt ‒ Up/Down/Left/Right (portrait / landscape) Interrupt ‒ Tap Detection Interrupt ‒ GINT (real-time motion tracking, generate interrupt each sample period) ‒ Shake on X-axis, Shake on Y-axis, and Shake on Z-axis ‒ Drop event detection The INTEN: Interrupt Enable Register contains many of the interrupt enable bits. The drop interrupt enable bit DINT is located in the DROP: Drop Event Control Register. 8.2 INTERRUPT SUPPORT The following table shows the relationship between motion events and interrupt enable bits for determining when the device will generate an interrupt. No measurements or interrupts are generated in the STANDBY state. Motion Event Portrait/Landscape or Front/Back orientation change Interrupt Enable Bits FBINT = 1 PLINT = 1 SHINTX = 1 SHINTY = 1 SHINTZ = 1 Shake Tap Drop Sample Update Table 11. Interrupt Support TINT = 1 DINT = 1 GINT = 1 mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer 8.3 GINT INTERRUPT Preliminary Datasheet The GINT interrupt can trigger on each sample period (default), or be “filtered” by the bandwidth setting of the LPF. If the OUTCFG: Output Configuration Register IRATE bit is inactive, then the GINT interrupt will trigger each sample period. If the IRATE bit is active, the GINT interrupt rate will be updated based on the low-pass filter setting controlled by bit-field LPF.mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer 8.4 EVENT DETECTION Preliminary Datasheet The detection logic monitors and compares sensor outputs against the comparisons selected by the application software. Each type of event can be masked by a separate bit in the INTEN: Interrupt Enable Register. The following table shows how the detection events are evaluated. Event Up X Axis |Z|< (UD_Z_TH) and |X|> (UD_X_TH) and X < 0 1Y Axis Z Axis Down |Z|< (UD_Z_TH) and |X|> (UD_X_TH) and X > 0 1 Right |Z|< (RL_Z_TH) and |Y|> (RL_Y_TH) and Y < 0 2 Left |Z|< (RL_Z_TH) and |Y|> (RL_Y_TH) and Y > 0 2 Front Back SHAKED DROPD TAPD 654 |X| > 1.3g ± SHAKE_TH |X| < 0.5g ± DROP_TH |X|> TAP_TH |Y| > 1.3g ± SHAKE_TH |Y| < 0.5g ± DROP_TH |Y|> TAP_TH Z > FB_Z_TH Z < -1 * FB_Z_TH |Z| > 1.3g ± SHAKE_TH |Z| < 0.5g ± DROP_TH |Z|> TAP_TH 33Table 12. Detection Logic Event Evaluation 1 Up/Down Z threshold is programmable from 0.425g to 1.172g, up/down X threshold is programmable from |X| to |X| + 0.747g. 2 Right/left Z threshold is programmable from 0.425g to 1.172g, right/left Y threshold is programmable from |Y| to |Y| + 0.747g. 3 4 5Front/back Z threshold is programmable from 0.174g to 0.547g. SHAKED event is triggered when any axis > SHAKE_TH, programmable from 0.925g to 1.1672g. DROPD event is triggered when condition (a) |X|+|Y|+|Z| < 0.5g + DROP_TH or condition (b) |X|<0.5g ± DROP_TH and |Y| < 0.5g ± DROP_TH and |Z| < 0.5g ± DROP_TH, this is user selectable. The range is from 0.125g to 0.872g. 6 TAPD event is triggered by |X|> TAP_TH or |Y|>TAP_TH g or |Z|>TAP_TH, where TAP_TH is programmable and any combination of X, Y, and Z may be selected. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer Preliminary Datasheet 9 ORIENTATION DETECTION The MC3410 allows an application to determine the orientation of the device. The current orientation of the device is reported as Left, Right, Up, Down, Front, and Back for each sampling period. This information generates the Portrait/Landscape status bits in the TILT: Status Register. 9.1 ORIENTATION HYSTERESIS Hysteresis can be added to portrait/landscape and front/back detection by modifying the default threshold offset values. See the specific sections below for more information. 9.2 PORTRAIT/LANDSCAPE EVENTS Portrait/landscape detection is a combination of left, right, up, and down events, also partially dependent upon Z sensor readings. The default comparison angle for portrait/landscape is 45 degrees when evaluating differences between LEFT, RIGHT, UP, and DOWN, as long as the magnitude of Z is < 0.8g (default). See Figure 6. By increasing the threshold values written to the UD_X_TH: Up/Down X Axis Threshold and RL_Y_TH: Right/Left Y Axis Threshold, hysteresis can be introduced to the angle of evaluation. These registers add a small offset to the default X and Y values and introduce additional margin in the portrait/landscape detection logic. For most applications, the same value should be written to both registers. When the device orientation is in the hysteresis region, the device will report orientation as “unknown”. When this reading is reported, in order to implement a hysteresis effect for orientation, high-level software should use the last known portrait/landscape information. In the example shown in Figure 7 the evaluation angle has been decreased to 40 degrees in each threshold, such that there is a 10 degree “deadband” or hysteresis-area between LEFT/RIGHT and DOWN/UP areas. The circle represents the acceleration in the Z axis, which has a default of 0.8g, or about a 33 degree tilt relative to the Z axis. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer Default UD_Z_TH ≈ 33º (Up/Down Arc radius)Default UD_X_TH ≈ 45º Default UD_Z_TH ≈ 33º (Up/Down Arc radius)Preliminary Datasheet UD_X_TH ≈ 40ºPOLA = UP-XDefault RL_Y_TH ≈ 45ºPOLA = UP-XHysteresis ≈ 10ºRL_Y_TH ≈ 40ºPOLA = LEFT+YPOLA = UNKNOWN in shaded region-YPOLA = RIGHTPOLA = LEFT+YPOLA = UNKNOWN in shaded regions-YPOLA = RIGHT Default RL_Z_TH ≈ 33º(Left/Right Arc radius)+XPOLA = DOWNDefault RL_Z_TH ≈ 33º(Left/Right Arc radius)+XPOLA = DOWN Figure 6. Default Orientation Settings Figure 7. Example Simple Orientation Hysteresis = 10 degrees The Z threshold for each direction can also be adjusted, as shown in Figure 8. This has the effect of altering the angle relative to the Z axis which causes the orientation state to change. Figure 9 shows an example of setting the UD_Z_TH and RL_Z_TH registers to different values, as well as setting the UD_X_TH and RL_Y_TH registers to different values. However for most applications the same value should be written to both registers in both cases. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 24 / 73
MC3410 3-Axis Accelerometer UD_Z_TH ≈ max (1º)(Up/Down Arc radius)UD_X_TH ≈ 40º UD_Z_TH ≈ 59º(Up/Down Arc radius)Preliminary Datasheet POLA =UP-XUD_X_TH ≈ 13ºHysteresis ≈ 49ºPOLA = UP-XHysteresis ≈ 10ºRL_Y_TH ≈ 40ºPOLA = UNKNOWN in shaded regionsRL_Y_TH ≈ 28ºPOLA = LEFT+Y-YPOLA = RIGHTPOLA = LEFT+Y-YPOLA = RIGHTRL_Z_TH ≈ max (1º)(Left/Right Arc radius)RL_Z_TH ≈ 1º(Left/Right Arc radius) inNWOnsKNioNeg U r =edLAhadPOs+XPOLA = DOWN+XPOLA = DOWN Figure 8. Effect of Changing UD_Z_TH Threshold with Hysteresis = 10 degrees Figure 9. Example of Complex Thresholds for Up/Down X, Right/Left Y, Up/Down Z & Right/Left Z Table 13 summarizes the portrait/landscape event evaluation criteria. Some example threshold values and the corresponding trip angle and amount of hysteresis are shown in Table 14. Event Up X Axis |Z|< (UD_Z_TH) and |X|> (UD_X_TH) and X < 0 Down |Z|< (UD_Z_TH) and |X|> (UD_X_TH) and X > 0 Right |Z|< (RL_Z_TH) and |Y|> (RL_Y_TH) and Y < 0 Left |Z|< (RL_Z_TH) and |Y|> (RL_Y_TH) and Y > 0 Table 13. Portrait/Landscape Event Evaluation Criteria Y Axis Z Axis mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer Registers UD_X_TH or RL_Y_TH Threshold Value 0x00 0x10 0x20 0x30 0x40 0x50 0x60 … 0xFF Resulting Hysteresis Preliminary Datasheet Corresponding g Value (approximate) 0.72 0.68 0.66 0.63 0.61 0.58 0.55 … 0.26 Trip Angle (approx. degrees) 45 43 41 39 37 36 34 … 15 (approx. degrees) 0 4 8 12 16 20 24 … 64 Table 14. Some Approximate X and Y-axis Portrait/Landscape Evaluation Angles and Values Registers UD_Z_TH or RL_Z_TH Threshold Value 0x80 0x90 … 0xE0 0xF0 0x00 0x10 0x20 … 0x70 0x7F Trip Angle (approx. degrees) 67 64 … 48 45 40 36 32 … 9 3 Corresponding g Value (approximate) 0.43 0.47 … 0.71 0.75 0.80 0.85 0.89 … 1.13 Max (~0.17)* Table 15. Some Approximate Z-axis Portrait/Landscape Evaluation Angles and Values NOTE*: Max values >1.0g are possible, to cover offset variations. Table 16 shows the orientation event conditions for the portrait/landscape detection hardware. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer POLA[2:0] 000 001 010 101 110 Down 0 0 0 1 0 Preliminary Datasheet Up 0 0 0 0 1 Left 0 1 0 0 0 Right 0 0 1 0 0 Description/Comments Unknown Left/landscape Right/landscape Down/portrait Up/portrait Table 16. Portrait/Landscape TILT: Status Register Assignments mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer 9.3 FRONT/BACK EVENTS Preliminary Datasheet The front/back detection compares ZOUT with a low g value, ranging from 0.174g to 0.547g, with the offset from 0.174g specified by the FB_Z_TH: Front/Back Z Axis Threshold Register. This equates to a range of approximately 55 degrees. The BAFR bit-field is updated in the TILT: Status Register according to the front/back orientation sensed by the device. Additional hysteresis can be added to front/back detection by increasing the front/back Z axis threshold value located in the FB_Z_TH: Front/Back Z Axis Threshold Register. When the front/back orientation of the device is in the deadband region, BAFR bit-field will report the orientation as “unknown”. The default settings (0x00) equate to a range of approximately 25 degrees where the sensor will report BAFR = FRONT (or BACK). The maximum settings (0xFF) equate to about a 80 degree range. See Figure 10 and Figure 11. BAFR = FRONTBAFR = FRONT+ZBAFR = UNKNOWN+Z25.0°se25.0°BAFR = UNKNOWNBAFR = BACK80.0°BAFR = UNKNOWNBAFR = UNKNOWNFB_Z_TH = 0x00 == 25º(default, approx.)Figure 10. Default Setting of FB_Z_TH for BAFR Readings nsorsens80.0°or-Z-Z BAFR = BACK FB_Z_TH = 0xFF == 80º(maximum, approx.) Figure 11. Maximum setting of FB_Z_TH for BAFR Readings The bit settings for the BAFR bit-field are shown in Table 17. Table 18 shows the front/back orientation evaluation criteria. Some example threshold values and the corresponding trip angles are shown in Table 19. All values are approximate and not tested in production. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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MC3410 3-Axis Accelerometer BAFR[1:0] 00 01 10 11 Status Unknown condition of front or back Preliminary Datasheet Front: Device is in orientation e. in Figure 18 Back: Device is in orientation f. in Figure 18 Reserved Table 17. BAFR Bit Assignments in the TILT: Status Register Event Front Back X Axis Y Axis Z Axis Z > FB_Z_TH Z < -1 * FB_Z_TH Table 18. Front/Back Event Evaluation FB_Z_TH Trip Angle Threshold Value 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 … 0xFF Table 19. Approximate Front/Back Evaluation Angles and Values (approx. degrees) 25 28 32 35 39 42 46 49 … 80 mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 29 / 73
MC3410 3-Axis Accelerometer 9.4 SHAKE DETECTION Preliminary Datasheet The threshold for detecting a shake event can be set to a range of values around a 1.3g baseline. The shake threshold can range from 0.925g to 1.672g. The value is a signed, 2’s complement number. Resolution is approximately 2.9mg/bit. A shake event will be triggered when high-g values are sensed for a sufficient number of samples. SHDB: Shake Debounce Register can be set to count from 1 to 63 events before setting the SHAKED bit in the TILT: Status Register. Higher values yield longer evaluation periods. See Figure 12 and Figure 13. Shake detection can be any combination of axes. To enable detection even when not using interrupts, set the corresponding SHINTX, SHINTY, or SHINTZ bit-fields in the INTEN: Interrupt Enable Register. Event X Axis or Y Axis |Y| > +1.3g ± Threshold or Z Axis |Z| > +1.3g± Threshold Shake |X| > +1.3g ± Threshold Table 20. SHAKE Event Evaluation (Baseline + Offset) Sensed g valueSampleShake detect is reset hereSHAKE_TH Register1.3 g{TimeShake Debounce Register == 4 but the sensed g value is above 1.3g + SHAKE_TH for only 3 samples. Shake event is not detected. Figure 12. Example Use of Shake Detection Hardware – Shake Not Detected mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 30 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet Sensed g valueSampleShake detected hereSHAKE_TH Register1.3 g{TimeShake Debounce Register == 4 and the sensed g value is above 1.3g + SHAKE_TH for 5 samples. Shake event is detected. Figure 13. Example Use of Shake Detection Hardware – Shake Detected. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 31 / 73
MC3410 3-Axis Accelerometer 9.5 DROP DETECTION Preliminary Datasheet Drop detection is defined as a low-g acceleration applied to all axes. Two modes of drop detection are supported: Mode A: Drop detection is a summation of all 3 axes: Drop is detected when: Sum( mag(X) + mag(Y) + mag(Z) ) < 0.5g ± DROP_TH Threshold else Drop not detected; Mode B: Drop detection is the logical AND of three comparisons: Drop is detected when: mag(X) < 0.5g ± DROP_TH Threshold and mag(Y) < 0.5g ± DROP_TH Threshold and mag(Z) < 0.5g ± DROP_TH Threshold else Drop not detected. The typical drop threshold value is on the order of < 0.5g for all axes. The drop detection range is from 0.125g to 0.872g. The drop debounce value (bit-field DDB in the DROP: Drop Event Control Register) can filter from 1 to 8 consecutive events before setting the drop interrupt. Event Drop Mode A Drop Mode B X Axis Sum (|X| |X| < 0.5g ± DROP_TH + and Y Axis |Y| |Y| < 0.5g ± DROP_TH + and Z Axis |Z|) < 0.5g ± DROP_TH |Z| < 0.5g ± DROP_TH Table 21. Drop Event Evaluation mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 32 / 73
MC3410 3-Axis Accelerometer 9.6 TAP DETECTION Preliminary Datasheet On-chip tap detection hardware allows the device to detect user events such as on-screen button presses. Tap detection can be enabled or disabled on each axis via the TAPEN: Tap Detection Enable Register. To detect fast, impulse events like a tap, the TAPP: Tap Pulse Register should be written with a tap pulse parameter that sets the maximum number of sample periods that a TAPD event may exceed the threshold before it is ignored by the detection logic. Sensed values that are above the threshold for long periods of time typically do not correspond to tap events. For example, setting the pulse value to 5 requires that the tap impulse exceed the threshold for at least 1 sample period and up to 5 sample periods. The tap detection hardware is rearmed after the sensed value is below the threshold. See the example in Figure 14 and Figure 15. Tap detect is reset here (6th sample)SampleSensed ValueTap detect is rearmed hereTAP_TH Register0 snapTimeTap Pulse Register == 5 but the sensed value is above the threshold for 10 samples. No tap is detected. Figure 14. Example Use of Tap Detection Hardware – No Tap Detected mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 33 / 73
MC3410 3-Axis Accelerometer SamplePreliminary Datasheet Sensed ValueCompared ValueSensed ValueTap detected hereTAP_TH Register0 snapTimeTap Pulse Register == 5 and the sensed value is above the threshold for 3 samples. Tap is detected. Figure 15. Example Use of Tap Detection Hardware – Tap Detected The threshold value, set by writing the TAP_TH: Tap Threshold Register, is an 8-bit unsigned number that species the threshold detection level for all tap events. This value is not an offset, but a magnitude which determines the minimum level for a valid tap event. Event Tap X Axis |X|> TAP_TH Y Axis |Y|> TAP_TH Z Axis |Z|> TAP_TH Table 22. Default Tap Event Evaluation mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 34 / 73
MC3410 3-Axis Accelerometer 9.7 CONTINUOUS SAMPLING Preliminary Datasheet The device has the ability to read all sampled readings in a continuous sampling fashion. The device always updates the XOUT_EX, YOUT_EX, and ZOUT_EX registers at 1024 samples/second. An optional interrupt can be generated each time the sample registers have been updated (GINT interrupt bit in the INTEN: Interrupt Enable Register). See Sections 8.3 and 11.11 for GINT operation and options. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 35 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 10 I2C INTERFACE 10.1 PHYSICAL INTERFACE The I2C slave interface operates at a maximum speed of 400 kHz. The SDA (data) is an open-drain, bi-directional pin and the SCL (clock) is an input pin. The device always operates as an I2C slave. An I2C master initiates all communication and data transfers and generates the SCL clock that synchronizes the data transfer. The I2C device address is 0x4c (8-bit address 0x98). The I2C interface remains active as long as power is applied to the DVDD and AVDD pins. In STANDBY state the device responds to I2C read and write cycles, but interrupts cannot be serviced or cleared. All registers can be written in the STANDBY state, but in WAKE only the MODE: Register can be modified. Internally, the registers which are used to store samples are clocked by the sample clock gated by I2C activity. Therefore, in order to allow the device to collect and present samples in the sample registers at least one I2C STOP condition must be present between samples. Refer to the I2C specification for a detailed discussion of the protocol. Per I2C requirements, SDA is an open drain, bi-directional pin. SCL and SDA each require an external pull-up resistor, typically 4.7kΩ. Refer also to Figure 3. Typical Application Circuit. 10.2 TIMING See Section 4.3.3 I2C Timing Characteristics for I2C timing requirements. 10.3 I2C MESSAGE FORMAT The device uses the following general format for writing to the internal registers. The I2C master generates a START condition, and then supplies the device ID, 0x4C or 1001100. The 8th bit is the R/W# flag (write cycle = 0). The device pulls SDA low during the 9th clock cycle indicating a positive ACK. This means, from an 8-bit point of view of an external I2C master, writes should be written to address 0x98 and reads will occur by reading address 0x99. The second byte is the 8-bit register address of the device to access, and the last byte is the data to write. STARTI2C Master(To Sensor)I2C Slave(From Sensor)Device ID (4C)R/W#Register AddressRegister Data to WriteStopS10011000R7R6R5R4R3R2R1R0D7D6D5D4D4D2D1D0PACKACKACKACK/NAKACK/NAKACK/NAK Figure 16. I2C Message Format, Write Cycle, Single Register Write mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 36 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet In a read cycle, the I2C master writes the device ID (R/W#=0) and register address to be read. The master issues a RESTART condition and then writes the device ID with the R/W# flag set to ‘1’. The device shifts out the contents of the register address. STARTI2C Master(To Sensor)I2C Slave(from Sensor)Device ID (4C)R/W#Register AddressRestartDevice ID (4C)R/W#NAKNAKSTOPPS10011000R7R6R5R4R3R2R1R0R10011001ACKACKACKD7D6D5D4D3D2D1D0ACK/NAKACK/NAKACK/NAKRead Data Byte Figure 17. I2C Message Format, Read Cycle, Single Register Read The I2C master may write or read consecutive register addresses by writing or reading additional bytes after the first access. The device will internally increment the register address. If an I2C burst read operation reads past register address 0x12 the internal address pointer “wraps” to address 0x03 and the contents of the TILT: Status Register are returned. This allows application software to burst read the contents of the six extended registers and the relevant device state registers in a single I2C cycle. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 37 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11 REGISTER INTERFACE The device has a simple register interface which allows a MCU or I2C master to configure and monitor all aspects of the device. This section lists an overview of user programmable registers. By convention, Bit 0 is the least significant bit (LSB) of a byte register. Two registers are needed in order to contain each sample, the XOUT_EX, YOUT_EX & ZOUT_EX: X, Y, Z-Axis Extended Accelerometer Registers. The least significant byte is located in the register with a lower address (e.g. XOUT_EX_L), followed by the most significant byte in the next higher address (e.g. XOUT_EX_H). mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 38 / 73
MC3410 3-Axis Accelerometer 11.1 REGISTER SUMMARY Addr Name 0x00-0x02 0x03 TILT Tilt Status Register Preliminary Datasheet Description Bit 7 Bit 6 Bit 5 Bit 4 RESERVED 6Bit 3 Bit 2 Bit 1 Bit 0 POR R/5Value W SHAKED DROPD OTPA 0 TAPD Resv 8POLA [2] 0 RESERVED 6POLA [1] 0 POLA [0] 0 0x04 OPSTAT 0x05 0x06 INTEN 0x07 MODE 0x08 0x09 TAPEN 0x0A TAPP 0x0B DROP 0x0C SHDB 0x0D XOUT _EX_L XOUT 0x0E _EX_H YOUT 0x0F _EX_L Operational State Status RegisterBAFR BAFR [1] [0] OPSTAT OPSTAT [1] [0] PLINT OPCON [1] FBINT OPCON [0] Resv TAPP [0] DROP_ DB[0] SHDB [0] XOUT _EX[0] XOUT _EX[8] YOUT _EX[0] YOUT _EX[8] ZOUT _EX[0] ZOUT _EX[8] 80x00 0x03 R R Interrupt Enable RegisterSHINTX IAH SHINTY IPP SHINTZ Resv 8GINT Resv 8ASINT Resv 6TINT 0 70x00 0x03 W W Mode Register8RESERVED Tap Detection Enable RegisterTap Pulse RegisterZDA YDA Resv DINT Resv 88XDA Resv Resv 88Resv Resv Resv 888Resv TAPP [3] Resv 88Resv TAPP [2] DROP_ DB[2] 8Resv TAPP [1] DROP_ DB[1] SHDB [1] XOUT _EX[1] XOUT _EX[9] YOUT _EX[1] YOUT _EX[9] ZOUT _EX[1] ZOUT _EX[9] 80x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 W W W W R R R R R R Resv DROP_ MODE Resv 88Drop Event Control RegisterShake Debounce RegisterXOUT Extended RegisterXOUT Extended RegisterYOUT Extended RegisterSHDB SHDB SHDB SHDB [5] [4] [3] [2] XOUT XOUT XOUT XOUT XOUT XOUT _EX[7] _EX[6] _EX[5] _EX[4] _EX[3] _EX[2] XOUT XOUT XOUT XOUT XOUT XOUT _EX[15] _EX[14] _EX[13] _EX[12] _EX[11] _EX[10] YOUT YOUT YOUT YOUT YOUT YOUT _EX[7] _EX[6] _EX[5] _EX[4] _EX[3] _EX[2] YOUT YOUT YOUT YOUT YOUT YOUT _EX[15] _EX[14] _EX[13] _EX[12] _EX[11] _EX[10] ZOUT _EX[7] ZOUT _EX[6] ZOUT _EX[5] ZOUT _EX[4] ZOUT _EX[3] ZOUT _EX[2] YOUT 0x10 _EX_H ZOUT 0x11 _EX_L ZOUT 0x12 _EX_H 0x13-0x17 0x18 CHIPID 0x19-0x1F 0x20 OUTCFG 0x21 XOFFL YOUT Extended RegisterZOUT Extended RegisterZOUT Extended RegisterZOUT ZOUT ZOUT ZOUT ZOUT ZOUT _EX[15] _EX[14] _EX[13] _EX[12] _EX[11] _EX[10] RESERVED6 Chip ID Register0 0 0 0 RESERVED 60 0 1 0 0x02 R Output Configuration RegisterX-Offset LSB RegisterIRATE LPF [2] LPF [1] LPF [0] HIRES [1] HIRES [0] 1 91 90x03 W XOFF[7] XOFF[6] XOFF[5] XOFF[4] XOFF[3] XOFF[2] XOFF[1] XOFF[0] Per chip W 56 ‘R’ registers are read-only, via external I2C access. ‘W’ registers are read-write, via external I2C access. Registers designated as ‘RESERVED’ should not be accessed by software. 7 Software must always write a zero ‘0’ to this bit. 8 Bits designated as ‘Resv’ are reserved for future use. 9 Software must always write a one ‘1’ to this bit. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 39 / 73
MC3410 3-Axis Accelerometer Addr Name 0x22 XOFFH 0x23 YOFFL 0x24 YOFFH 0x25 ZOFFL 0x26 ZOFFH 0x27 XGAIN 0x28 YGAIN 0x29 ZGAIN 0x2A 0x2B 0x2C 0x2D 0x2E 0x2F 0x30 0x31 0x32 SHAKE Shake _TH Threshold RegisterUD_Z _TH UD_X _TH RL_Z _TH RL_Y _TH FB_Z _TH DROP _TH Up/Down Z Threshold RegisterUp/Down X Threshold RegisterRight/Left Z Threshold RegisterRight/Left Y Threshold RegisterFront/Back Z Threshold RegisterDrop Threshold Register Bit 6 Resv 8Preliminary Datasheet Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR R/5Value W Description X-Offset MSB RegisterY-Offset LSB RegisterBit 7 XGAIN[8] Bit 5 XOFF[13] XOFF[12] XOFF[11] XOFF[10] XOFF[9] XOFF[8] Per chip W YOFF[7] YOFF[6] YOFF[5] YOFF[4] YOFF[3] YOFF[2] YOFF[1] YOFF[0] Per chip W YGAIN[8] Y-Offset MSB RegisterZ-Offset LSB RegisterResv 8YOFF[13] YOFF[12] YOFF[11] YOFF[10] YOFF[9] YOFF[8] Per chip W ZOFF[7] ZOFF[6] ZOFF[5] ZOFF[4] ZOFF[3] ZOFF[2] ZOFF[1] ZOFF[0] Per chip W ZGAIN[8] Z-Offset MSB RegisterResv 8ZOFF[13] ZOFF[12] ZOFF[11] ZOFF[10] ZOFF[9] ZOFF[8] Per chip W X Gain RegisterY Gain RegisterZ Gain RegisterXGAIN[7] XGAIN[6] XGAIN[5] XGAIN[4] XGAIN[3] XGAIN[2] XGAIN[1] XGAIN[0] Per chip W YGAIN[7] YGAIN[6] YGAIN[5] YGAIN[4] YGAIN[3] YGAIN[2] YGAIN[1] YGAIN[0] Per chip W ZGAIN[7] ZGAIN[6] ZGAIN[5] ZGAIN[4] ZGAIN[3] ZGAIN[2] ZGAIN[1] ZGAIN[0] Per chip W SHAKE _TH[7] UD_Z _TH[7] UD_X _TH[7] RL_Z _TH[7] RL_Y _TH[7] FB_Z _TH[7] DROP _TH[7] TAP _TH[7] 1 SHAKE _TH[6] UD_Z _TH[6] UD_X _TH[6] RL_Z _TH[6] RL_Y _TH[6] FB_Z _TH[6] DROP _TH[6] TAP _TH[6] 0 SHAKE _TH[5] UD_Z _TH[5] UD_X _TH[5] RL_Z _TH[5] RL_Y _TH[5] FB_Z _TH[5] DROP _TH[5] TAP _TH[5] 1 RESERVED SHAKE SHAKE _TH[4] _TH[3] UD_Z _TH[4] UD_X _TH[4] RL_Z _TH[4] RL_Y _TH[4] FB_Z _TH[4] DROP _TH[4] UD_Z _TH[3] UD_X _TH[3] RL_Z _TH[3] RL_Y _TH[3] FB_Z _TH[3] DROP _TH[3] 6SHAKE _TH[2] UD_Z _TH[2] UD_X _TH[2] RL_Z _TH[2] RL_Y _TH[2] FB_Z _TH[2] DROP _TH[2] TAP _TH[2] 0 SHAKE _TH[1] UD_Z _TH[1] UD_X _TH[1] RL_Z _TH[1] RL_Y _TH[1] FB_Z _TH[1] DROP _TH[1] TAP _TH[1] 0 SHAKE _TH[0] UD_Z _TH[0] UD_X _TH[0] RL_Z _TH[0] RL_Y _TH[0] FB_Z _TH[0] DROP _TH[0] TAP _TH[0] 0 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 W W W W W W W W TAP Tap _TH Threshold Register0x33 to 0x3A Product CodeTAP TAP _TH[4] _TH[3] 6RESERVED 0 RESERVED 60x3B PCODE 0x3C to 0x3F 1 0xA8 R Table 23. Register Summary 10 10 No registers are updated with new event status or samples while a I2C cycle is in process. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 40 / 73
MC3410 3-Axis Accelerometer 11.2 TILT: STATUS REGISTER Preliminary Datasheet This register contains bits which are set when a motion event is detected. Each event has a corresponding interrupt enable which can mask any combination of events. The event detection bits (SHAKED, DROPD, TAPD) remain held until the register is read by the I2C interface. Note that the orientation bit-fields POLA and BAFR are continuously updated (every sample) in the TILT: Status Register and are not held. Note that multiple interrupts may be active at the same time, and so a software routine reading the TILT: Status Register should account for this. Refer to Figure 18. Package Orientation and Figure 19. Package Axis Reference. Addr 0x03 Name TILT Description Tilt Status Register Bit 7 SHAKED Bit 6 DROPD Bit 5 TAPD Bit 4 POLA [2] Bit 3 POLA [1] Bit 2 POLA [0] Bit 1 BAFR [1] Bit 0 BAFR [0] POR R/Value W 0x00 R BAFR[1:0] Back or Front 00: Unknown condition of front or back 01: Front – Device is in orientation e in Figure 18. Package Orientation. 10: Back – Device is in orientation f in Figure 18. Package Orientation. 11: Reserved Portrait or Landscape 000: Unknown condition of up, down, left or right 001: Left – Device is in orientation b in Figure 18. Package Orientation. 010: Right – Device is in orientation c in Figure 18. Package Orientation. 011: Reserved 100: Reserved 101: Down – Device is in orientation d in Figure 18. Package Orientation. 110: Up – Device is in orientation a in Figure 18. Package Orientation. 111: Reserved 0: Tap event not detected 1: Tap event detected 0: Drop event not detected 1: Drop event detected 0: Shake event not detected 1: Shake event detected POLA[2:0] TAPD DROPD SHAKED Table 24. TILT Status Register Settings mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 41 / 73
MC3410 3-Axis Accelerometer Top Viewa.Direction of Earth gravity acceleration Preliminary Datasheet TopPin 1Side Viewe.b.XOUT = -1gYOUT = 0gZOUT = 0gTILT = UPc.XOUT = 0gYOUT = 0gZOUT = +1gTILT = FRONTf.XOUT = 0gYOUT = +1gZOUT = 0gTILT = LEFTd.XOUT = 0gYOUT = -1gZOUT = 0gTILT = RIGHTXOUT = 0gYOUT = 0gZOUT = -1gTILT = BACKXOUT = +1gYOUT = 0gZOUT = 0gTILT = DOWN Figure 18. Package Orientation +Z-Y-X+X+Y-Z Figure 19. Package Axis Reference mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 42 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.3 OPSTAT: OPERATIONAL STATE STATUS REGISTER The Operational State status register reports which operational state the device is in, either WAKE or STANDBY as shown in Table 25. Operational State Status Register Addr Name Description Operational State Status Register Bit 7 OTPA Bit 6 0 Bit 5 Resv Bit 4 0 Bit 3 0 Bit 2 0 Bit 1 Bit 0 POR R/Value W 0x03 R OPSTAT OPSTAT [1] [0] 0x04 OPSTAT OPSTAT[1:0] Sampling State Register Status, Wait State Register Status 00: Reserved 01: Device is in WAKE state 10: Reserved 11: Device is in STANDBY state, no sampling Reserved One-time Programming (OTP) activity status 0: Internal memory is idle and the device is ready for use 1: Internal memory is active and the device is not yet ready for use Resv OTPA Table 25. Operational State Status Register mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 43 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.4 INTEN: INTERRUPT ENABLE REGISTER The interrupt enable register enables or disables interrupts on various motion events. If the corresponding interrupt enable bit is set, a matching event will generate an interrupt transition on the external interrupt pin, INTN. To enable the drop interrupt, set the DINT control bit in the DROP: Drop Event Control Register. When an interrupt is triggered, the first I2C access to the device will clear the external interrupt pin, but the condition (TAPD, SHAKED, DROPD) that generated the interrupt will remain held in the TILT: Status Register until it is read. Note that the orientation bit-fields POLA and BAFR are continuously updated (every sample) in the TILT: Status Register and are not held. Addr 0x06 Name INTEN Description Bit 7 Bit 6 SHINTY Bit 5 SHINTZ Bit 4 GINT Bit 3 Resv Bit 2 TINT Bit 1 PLINT Bit 0 FBINT POR R/Value W 0x00 W Interrupt Enable SHINTX Register FBINT PLINT TINT Resv GINT Front / Back Interrupt 0: Disable interrupt on front/back position change 1: Enable interrupt on front/back position change Portrait / Landscape Interrupt 0: Disable interrupt on up/down/left/right position change 1: Enable interrupt on up/down/left/right position change Tap Interrupt 0: Disable interrupt on tap detection 1: Enable interrupt on tap detection Reserved Generate Interrupt 0: Disable automatic interrupt after each measurement 1: Enable automatic interrupt after each measurement is updated in XOUT, YOUT, or ZOUT. The interrupt occurs for each measurement, not value change. See Section 8.3. Shake Interrupt, X-axis 0: Disable X-axis interrupt, SHAKED is not set in TILT: Status Register upon event 1 : Enable X-axis interrupt, SHAKED is set in TILT: Status Register upon event Shake Interrupt, Y-axis 0: Disable Y-axis interrupt, SHAKED bit is not set in TILT: Status Register upon event 1 : Enable Y-axis interrupt, SHAKED bit is set in TILT: Status Register upon event Shake Interrupt, Z-axis 0: Disable Z-axis interrupt, SHAKED bit is not set in TILT: Status Register upon event 1 : Enable Z-axis interrupt, SHAKED bit is set in TILT: Status Register upon event SHINTX SHINTY SHINTZ Table 26. Interrupt Enable Register Settings mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 44 / 73
MC3410 3-Axis Accelerometer 11.5 MODE: REGISTER Preliminary Datasheet The MODE register controls the active operating state of the device. This register can be written from either operational state (STANDBY or WAKE). Addr 0x07 Name MODE Description Mode Register Bit 7 IAH Bit 6 IPP Bit 5 Resv *Bit 4 Resv *Bit 3 Resv *Bit 2 0 *Bit 1 OPCON [1] Bit 0 OPCON [0] POR R/Value W 0x03 W NOTE*: Software must always write a zero ‘0’ to Bit 2. Bits 3, 4 and 5 are reserved. 00: Reserved 01: Move to WAKE state and remain there 10: Reserved 11: Move to STANDBY state and remain there (STANDBY is the default POR state) 0: Interrupt pin INTN is open drain (default) and requires an external pull-up to AVDD. 1: Interrupt pin INTN is push-pull. No external pull-up resistor should be installed. 0: Interrupt pin INTN is active low 1: Interrupt pin INTN is active high Set Device Operational State. WAKE or STANDBY OPCON [1:0] Interrupt Push Pull IPP IAH Interrupt Active High Table 27. Mode Register Functionality mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 45 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.6 TAPEN: TAP DETECTION ENABLE REGISTER This register allows individual tap/pulse detection on each axis. Setting XDA, YDA, or ZDA adds the corresponding axis to tap event detection. See also Section 9.6 Tap Detection. Addr 0x09 Name TAPEN Description Tap Detection Enable Register Bit 7 ZDA Bit 6 YDA Bit 5 XDA Bit 4 Resv Bit 3 Resv Bit 2 Resv Bit 1 Resv Bit 0 Resv POR R/Value W 0x00 W XDA YDA ZDA 0: Disable Tap detection on X-axis 1: Enable Tap detection on X-axis 0: Disable Tap detection on Y-axis 1: Enable Tap detection on Y-axis 0: Disable Tap detection on Z-axis 1: Enable Tap detection on Z-axis Table 28. TAPEN Register Settings mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 46 / 73
MC3410 3-Axis Accelerometer 11.7 TAPP: TAP PULSE REGISTER Preliminary Datasheet This value sets the number of samples for which a tap pulse must exceed the TAP_TH threshold before it is rejected as not a tap event. If the values detected by the sensor exceed the TAP_TH threshold for longer than the reject count, no tap event is detected and the interrupt is not set. See also Section 9.6 Tap Detection. Addr 0x0A Name TAPP Description TAP Pulse Register Bit 7 Resv Bit 6 Resv Bit 5 Resv Bit 4 Resv Bit 3 TAPP [3] Bit 2 TAPP [2] Bit 1 TAPP [1] Bit 0 TAPP [0] POR R/Value W 0x00 W TAPP [3:0] 0x0 0x1 0x2 0x3 … 0xF Tap Detection Sample Periods (n) 1 2 3 4 5 ≤ n ≤ 15 16 Description This tap detection filtering requires the sensed values to exceed the TAP_TH threshold level for n sample periods. When they have, the sensor will set TAPD bit in the TILT: Status Register. In addition, if the TINT tap interrupt is enabled in the INTEN: Interrupt Enable Register then an interrupt will be generated by the device. Table 29. TAPP Tap Pulse Register Settings mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 47 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.8 DROP: DROP EVENT CONTROL REGISTER Addr 0x0B Name DROP Description Bit 7 Bit 6 DINT Bit 5 Resv Bit 4 Resv Bit 3 Resv Bit 2 DROP_ DB[2] Bit 1 DROP_ DB[1] Bit 0 DROP_ DB[0] POR R/Value W 0x00 W Drop Event Control DROP_ Register MODE DROP_DB[2:0] Drop Debounce Drop event debounce value, the number 000: 1 drop event of drop events detected must reach this 001: 2 adjacent drop events count for the final event to be valid. 010: 3 adjacent drop events … : 4 ≤ n ≤ 7 adjacent drop events 111: 8 adjacent drop events DINT Drop Interrupt The DROPD bit in the TILT: Status 0: Disable drop event interrupt Register will be set upon event 1: Enable drop event interrupt occurrence regardless of this bit setting. DROP_MODE Drop Mode 0: Mode A: Drop detection is a summation of all 3 axes: Drop is detected when: Sum( mag(X) + mag(Y) + mag(Z) ) < 0.5g ± DROP_TH Threshold else Drop not detected; 1: Mode B: Drop detection is the logical AND of three comparisons: Drop is detected when: mag(X) < 0.5g ± DROP_TH Threshold and mag(Y) < 0.5g ± DROP_TH Threshold and mag(Z) < 0.5g ± DROP_TH Threshold else Drop not detected. Table 30. Drop Event Control Register Settings mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 48 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.9 SHDB: SHAKE DEBOUNCE REGISTER The shake debounce register allows a 1 to 63 event count to be required before a valid shake event is detected or an interrupt is generated. The debounce value applies to all 3-axes. Addr 0x0C Name SHDB Description Shake Debounce Register Bit 7 Resv Bit 6 Resv Bit 5 SHDB [5] Bit 4 SHDB [4] Bit 3 SHDB [3] Bit 2 SHDB [2] Bit 1 SHDB [1] Bit 0 SHDB [0] POR R/Value W 0x00 W SHDB[5:0] 0x01 0x02 0x03 …. 0x3F Adjacent Shake Events (n) 1 2 3 4 ≤ n ≤ 62 63 Description Shake detection debounce filtering requires n adjacent shake detection events in order to trigger a shake event and set the SHAKED bit in the TILT: Status Register. In addition, if the SHINTX, SHINTY or SHINTZ bits are set in the INTEN: Interrupt Enable Register and that event occurs, then an interrupt will be generated by the device. Table 31. SH_DB Shake Debounce Register Settings mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 49 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.10 XOUT_EX, YOUT_EX & ZOUT_EX: X, Y, Z-AXIS EXTENDED ACCELEROMETER REGISTERS The measurements from sensors for the 3-axes are written to the registers XOUT_EX, YOUT_EX & ZOUT_EX: X, Y, Z-Axis Extended Accelerometer Registers. The most-significant bit of the value is the sign bit, and is sign extended to the higher bits. Note that all 3 axes are sampled and updated simultaneously. If an I2C burst read operation reads past register address 0x12 the internal address pointer “wraps” to address 0x03 and the contents of the TILT: Status Register are returned. This allows application software to burst read the contents of the six extended registers and relevant device state registers in a single I2C read cycle. Once an I2C start bit has been recognized by the sensor, registers will not be updated until an I2C stop bit has occurred. Therefore, if software desires to read the low and high byte registers ‘atomically’, knowing that the values have not been changed, it should do so by issuing a start bit, reading one register, then reading the other register then issuing a stop bit. Note that all 6 registers may be read in one burst with the same effect. 10-bit samples occupy bits [9:0], with bits [15:9] occupied by the sign bit. 14-bit samples occupy bits [13:0], with bits [15:13] occupied by the sign bit. Addr 0x0D 0x0E 0x0F 0x10 0x11 0x12 Name XOUT _EX_L XOUT _EX_H YOUT _EX_L YOUT _EX_H ZOUT _EX_L ZOUT _EX_H Description Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 XOUT _EX[1] XOUT _EX[9] YOUT _EX[1] YOUT _EX[9] ZOUT _EX[1] ZOUT _EX[9] Bit 0 XOUT _EX[0] XOUT _EX[8] YOUT _EX[0] YOUT _EX[8] ZOUT _EX[0] ZOUT _EX[8] POR R/Value W 0x00 0x00 0x00 0x00 0x00 0x00 R R R R R R XOUT Extended XOUT XOUT XOUT XOUT XOUT XOUT Register _EX[7] _EX[6] _EX[5] _EX[4] _EX[3] _EX[2] XOUT Extended XOUT XOUT XOUT XOUT XOUT XOUT Register _EX[15] _EX[14] _EX[13] _EX[12] _EX[11] _EX[10] YOUT Extended Register YOUT Extended Register ZOUT Extended Register ZOUT Extended Register YOUT _EX[7] YOUT _EX[6] YOUT _EX[5] YOUT _EX[4] YOUT _EX[3] YOUT _EX[2] YOUT YOUT YOUT YOUT YOUT YOUT _EX[15] _EX[14] _EX[13] _EX[12] _EX[11] _EX[10] ZOUT _EX[7] ZOUT _EX[6] ZOUT _EX[5] ZOUT _EX[4] ZOUT _EX[3] ZOUT _EX[2] ZOUT ZOUT ZOUT ZOUT ZOUT ZOUT _EX[15] _EX[14] _EX[13] _EX[12] _EX[11] _EX[10] Table 32. Extended Accelerometer Registers mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 50 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.11 CHIPID: CHIP IDENTIFICATION REGISTER This register returns 0x02. Addr 0x18 Name CHIPID Description Chip ID Register Bit 7 0 Bit 6 0 Bit 5 0 Bit 4 0 Bit 3 0 Bit 2 0 Bit 1 1 Bit 0 0 POR R/Value W 0x02 R mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 51 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.12 OUTCFG: OUTPUT CONFIGURATION REGISTER This register can be used to set the resolution of the accelerometer measurements, the maximum g-range and low-pass filter settings for sampling and the bandwidth setting for the GINT interrupt. The lowest 2 bits must be set by software to binary b‘11. Addr 0x20 Name OUTCFG Description Output Configuration Register Bit 7 IRATE Bit 6 LPF [2] Bit 5 LPF [1] Bit 4 LPF [0] Bit 3 HIRES [1] Bit 2 HIRES [0] Bit 1 1* Bit 0 1* POR R/Value W 0x03 W NOTE*: Software must always write a ‘1’ to bits 0 and 1. Accelerometer g Ranges and Resolution 00: Select +/- 2g range, 10-bit resolution 01: Select +/- 4g range, 10-bit resolution 10: Select +/- 8g range, 10-bit resolution 11: Select +/- 8g range, 14-bit resolution Low Pass Filter bandwidth 000: Low-pass filter set to 512 Hz bandwidth 001: Low-pass filter set to 256 Hz bandwidth 010: Low-pass filter set to 128 Hz bandwidth 011: Low-pass filter set to 64 Hz bandwidth 100: Low-pass filter set to 32 Hz bandwidth 101: Low-pass filter set to 16 Hz bandwidth 110: Low-pass filter set to 8 Hz bandwidth 111: Reserved GINT sample rate trigger 0: GINT interrupt updates at sample acquisition rate 1: GINT interrupt updates at LPF bandwidth setting determined by LPF[2:0] If IRATE=’1’, the GINT interrupt will occur at the same rate as the bandwidth setting of the LPF. This prevents extraneous sample acquisition interrupts at a rate greater than the LPF setting. HIRES[1:0] LPF[2:0] IRATE Table 33. OUTCFG Resolution and Range Select Register Settings mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 52 / 73
MC3410 3-Axis Accelerometer 11.13 X-AXIS OFFSET REGISTERS Preliminary Datasheet This register contains a signed 2’s complement 14-bit value applied as an offset adjustment to the output of the sensor values, prior to being sent to the OUT_EX registers. The Power-On-Reset value for each chip is unique and is set as part of factory calibration. If necessary, this value can be overwritten by software. Each LSB is worth ~0.73mg of offset. When adjusting offset values, note that the gain stage is after the offset stage inside the chip. Therefore an adjustment to the desired offset value might be required, inversely proportional to the gain. NOTE: When modifying these registers with new gain or offset values, software should perform a read-modify-write type of access to ensure that unrelated bits do not get changed inadvertently. Addr Name 0x21 XOFFL 0x22 XOFFH Description X-Offset LSB Register X-Offset MSB Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR Value R/W XOFF[7] XOFF[6] XOFF[5] XOFF[4] XOFF[3] XOFF[2] XOFF[1] XOFF[0] Per chip W XGAIN[8] Resv XOFF[13] XOFF[12] XOFF[11] XOFF[10] XOFF[9] XOFF[8] Per chip W mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 53 / 73
MC3410 3-Axis Accelerometer 11.14 Y-AXIS OFFSET REGISTERS Preliminary Datasheet This register contains a signed 2’s complement 14-bit value applied as an offset adjustment to the output of the sensor values, prior to being sent to the OUT_EX registers. The Power-On-Reset value for each chip is unique and is set as part of factory calibration. If necessary, this value can be overwritten by software. Each LSB is worth ~0.73mg of offset. When adjusting offset values, note that the gain stage is after the offset stage inside the chip. Therefore an adjustment to the desired offset value might be required, inversely proportional to the gain. NOTE: When modifying these registers with new gain or offset values, software should perform a read-modify-write type of access to ensure that unrelated bits do not get changed inadvertently. Addr Name 0x23 YOFFL 0x24 YOFFH Description Y-Offset LSB Register Y-Offset MSB Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR Value R/W YOFF[7] YOFF[6] YOFF[5] YOFF[4] YOFF[3] YOFF[2] YOFF[1] YOFF[0] Per chip W YGAIN[8] Resv YOFF[13] YOFF[12] YOFF[11] YOFF[10] YOFF[9] YOFF[8] Per chip W mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 54 / 73
MC3410 3-Axis Accelerometer 11.15 Z-AXIS OFFSET REGISTERS Preliminary Datasheet This register contains a signed 2’s complement 14-bit value applied as an offset adjustment to the output of the sensor values, prior to being sent to the OUT_EX registers. The Power-On-Reset value for each chip is unique and is set as part of factory calibration. If necessary, this value can be overwritten by software. Each LSB is worth ~0.73mg of offset. When adjusting offset values, note that the gain stage is after the offset stage inside the chip. Therefore an adjustment to the desired offset value might be required, inversely proportional to the gain. NOTE: When modifying these registers with new gain or offset values, software should perform a read-modify-write type of access to ensure that unrelated bits do not get changed inadvertently. Addr Name 0x25 ZOFFL 0x26 ZOFFH Description Z-Offset LSB Register Z-Offset MSB Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR Value R/W ZOFF[7] ZOFF[6] ZOFF[5] ZOFF[4] ZOFF[3] ZOFF[2] ZOFF[1] ZOFF[0] Per chip W ZGAIN[8] Resv ZOFF[13] ZOFF[12] ZOFF[11] ZOFF[10] ZOFF[9] ZOFF[8] Per chip W mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 55 / 73
MC3410 3-Axis Accelerometer 11.16 X-AXIS GAIN REGISTERS Preliminary Datasheet The gain value is an unsigned 9-bit number that is applied to the X-axis value following the offset adjustment stage. The gain is a 9-bit value with the MSB located in X-Offset MSB register bit 7. The gain is computed by the following formula: Gain = (40 + XGAIN)/128 For example, a XGAIN register value of decimal 88 results in a gain of 1. NOTE: When modifying these registers with new gain or offset values, software should perform a read-modify-write type of access to ensure that unrelated bits do not get changed inadvertently. Addr Name 0x22 XOFFH 0x27 XGAIN Description X-Offset MSB Register X Gain Register Bit 7 XGAIN[8] Bit 6 Resv Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR Value R/W XOFF[13] XOFF[12] XOFF[11] XOFF[10] XOFF[9] XOFF[8] Per chip W XGAIN[7] XGAIN[6] XGAIN[5] XGAIN[4] XGAIN[3] XGAIN[2] XGAIN[1] XGAIN[0] Per chip W mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 56 / 73
MC3410 3-Axis Accelerometer 11.17 Y-AXIS GAIN REGISTERS Preliminary Datasheet The gain value is an unsigned 9-bit number that is applied to the Y-axis value following the offset adjustment stage. The gain is a 9-bit value with the MSB located in Y-Offset MSB register bit 7. The gain is computed by the following formula: Gain = (40 + YGAIN)/128 For example, a YGAIN register value of decimal 88 results in a gain of 1. NOTE: When modifying these registers with new gain or offset values, software should perform a read-modify-write type of access to ensure that unrelated bits do not get changed inadvertently. Addr Name 0x24 YOFFH 0x28 YGAIN Description Y-Offset MSB Register Y Gain Register Bit 7 YGAIN[8] Bit 6 Resv Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR Value R/W YOFF[13] YOFF[12] YOFF[11] YOFF[10] YOFF[9] YOFF[8] Per chip W YGAIN[7] YGAIN[6] YGAIN[5] YGAIN[4] YGAIN[3] YGAIN[2] YGAIN[1] YGAIN[0] Per chip W mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 57 / 73
MC3410 3-Axis Accelerometer 11.18 Z-AXIS GAIN REGISTERS Preliminary Datasheet The gain value is an unsigned 9-bit number that is applied to the Z-axis value following the offset adjustment stage. The gain is a 9-bit value with the MSB located in Z-Offset MSB register bit 7. The gain is computed by the following formula: Gain = (40 + ZGAIN)/128 For example, a ZGAIN register value of decimal 88 results in a gain of 1. NOTE: When modifying these registers with new gain or offset values, software should perform a read-modify-write type of access to ensure that unrelated bits do not get changed inadvertently. Addr Name 0x26 ZOFFH 0x29 ZGAIN Description Z-Offset MSB Register Z Gain Register Bit 7 ZGAIN[8] Bit 6 Resv Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR Value R/W ZOFF[13] ZOFF[12] ZOFF[11] ZOFF[10] ZOFF[9] ZOFF[8] Per chip W ZGAIN[7] ZGAIN[6] ZGAIN[5] ZGAIN[4] ZGAIN[3] ZGAIN[2] ZGAIN[1] ZGAIN[0] Per chip W mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 58 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.19 SHAKE_TH: SHAKE THRESHOLD REGISTER SHAKE_TH has a baseline value of 1.3g plus a threshold, SHAKE_TH. The shake threshold can range from 0.925g to 1.672g. The value is an 8-bit signed 2’s complement number. The resolution is approximately 2.9mg/bit. See also Section 9.4 Shake Detection. Shake Event = ( mag(X) > 1.3g + SHAKE_TH ) or ( mag(Y) > 1.3g + SHAKE_TH ) or ( mag(Z) > 1.3g + SHAKE_TH ) Addr Name Description Shake Threshold Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR R/Value W 0x00 W 0x2B SHAKE_TH Signed 2’s complement value SHAKE_TH[7:0] 0x80 0x00 0x7F Table 34. SHAKE_TH Threshold Register Settings Description (~2.9mg/LSB) Shake threshold is 0.925g Shake threshold is 1.3g Shake threshold is 1.672g mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 59 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.20 UD_Z_TH: UP/DOWN Z AXIS THRESHOLD REGISTER The threshold value, UD_Z_TH[7:0] is an 8-bit signed 2’s complement number that can range from 0.425g to 1.172g, for determination of the POLA orientation bits. The resolution is approximately 2.9mg/bit. See also Section 9.2 Portrait/Landscape. Addr 0x2C Name Description Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR R/Value W 0x00 W Up/Down Z Axis UD_Z_TH Threshold Register Signed 2’s complement value UD_Z_TH[7:0] 0x80 0x00 0x7F Description (~2.9mg/LSB) Up/down Z axis threshold is 0.425g Up/down Z axis threshold is 0.8g Up/down Z axis threshold is 1.172g Table 35. Up/Down Z-axis Threshold Register Settings mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 60 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.21 UD_X_TH: UP/DOWN X AXIS THRESHOLD REGISTER This 8-bit unsigned value is an offset that is added to the magnitude of the X-axis accelerometer measurement. The range of the offset is 0g to 0.747g; the resolution is approximately 2.9mg/bit. See also Section 9.2 Portrait/Landscape. Increasing this value in conjunction with the RL_Y_TH: Right/Left Y Axis Threshold Register widens the deadband in portrait /landscape detection. For most applications, the same value should be written to both registers. Addr 0x2D Name Description Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR R/Value W 0x00 W Up/Down X Axis UD_X_TH Threshold Register Unsigned value UD_X_TH[7:0] 0x00 0xFF Description (~2.9mg/LSB) Up/down X threshold offset is 0g Up/down X threshold offset is +0.747g Table 36. Up/Down X-axis Threshold Register Settings mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 61 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.22 RL_Z_TH: RIGHT/LEFT Z AXIS THRESHOLD REGISTER The threshold value, RL_Z_TH[7:0] is an 8-bit signed 2’s complement number that can range from 0.425g to 1.172g, for determination of the POLA orientation bits. The resolution is approximately 2.9mg/bit. See also Section 9.2 Portrait/Landscape. Addr 0x2E Name Description Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR R/Value W 0x00 W Right/Left Z Axis RL_Z_TH Threshold Register Signed 2’s complement value RL_Z_TH[7:0] 0x80 0x00 0x7F Description (~2.9mg/LSB) Right/left Z axis threshold is 0.425g Right/left Z axis threshold is 0.8g Right/left Z axis threshold is 1.172g Table 37. Right/Left Z-axis Threshold Register Settings mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 62 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.23 RL_Y_TH: RIGHT/LEFT Y AXIS THRESHOLD REGISTER This 8-bit unsigned value is an offset this is added to the magnitude of the Y-axis accelerometer measurement. The range of the offset is 0g to 0.747g; the resolution is approximately 2.9mg/bit. See also Section 9.2 Portrait/Landscape. Increasing this value in conjunction with the UD_X_TH: Up/Down X Axis Threshold Register widens the dead-band in portrait /landscape detection. For most applications, the same value should be written to both registers. Addr 0x2F Name Description Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR R/Value W 0x00 W Right/Left Y Axis RL_Y_TH Threshold Register Unsigned value RL_Y_TH[7:0] 0x00 0xFF Description (~2.9mg/LSB) Right/left Y-axis threshold offset is 0g Right/left Y-axis threshold offset is +0.747g Table 38. Right/Left Y-axis Threshold Register Settings mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 63 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.24 FB_Z_TH: FRONT/BACK Z AXIS THRESHOLD REGISTER The threshold value, FB_Z_TH[7:0] is an 8-bit unsigned number that adds up to + 0.373g to the baseline detection level of 0.174g, in increments of approximately 1.46mg/LSB. Increasing the threshold value increases the hysteresis of the front/back detection level. See also Section 9.3 Front/Back. Addr 0x30 Name Description Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR R/Value W 0x00 W Front/Back Z Axis FB_Z_TH Threshold Register Unsigned value FB_Z_TH[7:0] 0x00 0xFF Description (~1.46mg/LSB) Front/back Z threshold is 0.174g Front/back Z threshold is 0.547g Table 39. Front/Back Z-axis Threshold Register Settings mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 64 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.25 DROP_TH: DROP THRESHOLD REGISTER The threshold value, DROP_TH[7:0] is an 8-bit signed 2’s complement number that adjusts the drop-detection baseline detection level of 0.5g. See also Section 9.5 Drop Detection. Addr 0x31 Name DROP_TH Description Drop Threshold Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR R/Value W 0x00 W Signed 2’s complement value DROP_TH[7:0] 0x80 0x00 0x7F Table 40. Drop Threshold Register Settings Description (~2.9mg/LSB) Drop threshold is 0.125g Drop threshold is 0.5g Drop threshold is 0.872g mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 65 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 11.26 TAP_TH: TAP THRESHOLD REGISTER The threshold value, TAP_TH[7:0] is an 8-bit unsigned number that species the threshold detection level for all tap events. This value is not an offset, but a magnitude which determines the minimum level for a valid tap event. The detector is implemented as a 2nd-order high pass filter. As such, the units are the 2nd derivative of acceleration, also known as ‘snap’. The full range is 0 to 12 snap. The resolution is ~47 milliSnap/bit. See also Section 9.6 Tap Detection. Addr 0x32 Name TAP_TH Description Tap Threshold Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR R/Value W 0x00 W Unsigned value TAP_TH[7:0] 0x00 0x80 0xFF Table 41. TAP_TH Tap Threshold Register Settings Description (~47 mSnap/LSB) Tap threshold is 0 snap Tap threshold is 6 snap Tap threshold is 12 snap mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 66 / 73
MC3410 3-Axis Accelerometer 11.27 PCODE: PRODUCT CODE Preliminary Datasheet This register returns a value specific to the part number of this mCube device, noted below. Addr 0x3B Name PCODE Description Product Code Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 POR R/Value W 0xA8 R 0xA8 mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 67 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet 12 EXAMPLE MC3410 CONFIGURATION This section shows an example configuration, for demonstration purposes. The sequences are described as register read and write cycles; the I2C device ID and protocol are implied. 12.1 EXAMPLE: SHAKE, TAP & DROP THRESHOLDS DEMO Sequence 1 2 3 4 5 6 7 8 9 11 13 14 15 16 Register 0x07 0x06 0x09 0x0A 0x0B 0x0C 0x20 0x2B 0x2C 0x2E 0x30 0x31 0x32 0x07 Data to Write Comments 0x43 0xE4 0x40 0x03 0x00 0x1F 0x33 0x44 0x95 0x95 0x40 0xAB 0x64 0x41 Go to STANDBY state, configure INTN pin, active low (IAH = 0), active drive (IPP = 1) Enable shake interrupt in X,Y or Z-axis, enable tap interrupt, disable others Enable Tap detection on Y-axis Tap detected for pulses > Tap threshold and for 4 or fewer sample periods Set drop mode A, drop debounce set to be 1 drop event, no drop interrupt Set shake debounce register to 31 adjacent shake events Select +/- 2g range at 10-bit resolution; LPF Bandwidth=64Hz; GINT updates at sample rate Set shake threshold to be approximately 1.5g (1.3 + 44 x ~2.9 mg/LSB). Set up/down Z axis threshold to ~0.5g (~60deg) Set right/left Z axis threshold to ~0.5g (~60deg) Set front/back Z axis threshold to ~39deg Set drop threshold to < ~0.25g Set tap threshold to ~4.7 snap Go to WAKE state, enable sampling, configure INTN pin, active low (IAH = 0), active drive (IPP = 1) Table 42. Tap Demo Register Sequence To observe the demo: ‒ Write the registers as shown above. ‒ Tap the device in the Y-direction mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved.
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MC3410 3-Axis Accelerometer Preliminary Datasheet ‒ Observe interrupt trigger and TAPD tap detection bit ‒ Read TILT: Status Register to reset the Tap interrupt ‒ Tap the device in the X and Z directions ‒ Observer no interrupt triggers ‒ Rotate the device around in 3D-space ‒ Observe that the up/down/left/right indications trip at a very steep angle (the chip must be tilted a lot in order for UNKNOWN to not be indicated by the hardware) ‒ Observe that there is very little hysteresis between the FRONT and BACK readings mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 69 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet
13 INDEX OF TABLES
Table 1. Order Information.........................................................................................................................................7 Table 2. Pin Description ........................................................................................................................................... 10 Table 3. Absolute Maximum Ratings ....................................................................................................................... 13 Table 4. Sensor Characteristics ................................................................................................................................ 14 Table 5. Electrical Characteristics ............................................................................................................................ 15 Table 6. I2C Electrical and Timing Characteristics ................................................................................................... 16 Table 7. I2C Timing Characteristics .......................................................................................................................... 17 Table 8. Summary of Resolution, Range, and Scaling ............................................................................................. 18 Table 9. Operational States ..................................................................................................................................... 20 Table 10. Forcing Operational States ...................................................................................................................... 21 Table 11. Interrupt Support ..................................................................................................................................... 23 Table 12. Detection Logic Event Evaluation ............................................................................................................ 25 Table 13. Portrait/Landscape Event Evaluation Criteria ......................................................................................... 29 Table 14. Some Approximate X and Y-axis Portrait/Landscape Evaluation Angles and Values .............................. 30 Table 15. Some Approximate Z-axis Portrait/Landscape Evaluation Angles and Values ........................................ 30 Table 16. Portrait/Landscape TILT: Status Register Assignments ........................................................................... 31 Table 17. BAFR Bit Assignments in the TILT: Status Register .................................................................................. 33 Table 18. Front/Back Event Evaluation ................................................................................................................... 33 Table 19. Approximate Front/Back Evaluation Angles and Values ......................................................................... 33 Table 20. SHAKE Event Evaluation (Baseline + Offset) ............................................................................................ 34 Table 21. Drop Event Evaluation ............................................................................................................................. 36 Table 22. Default Tap Event Evaluation................................................................................................................... 38 Table 23. Register Summary .................................................................................................................................... 44 Table 24. TILT Status Register Settings .................................................................................................................... 45 Table 25. Operational State Status Register ............................................................................................................ 47 Table 26. Interrupt Enable Register Settings ........................................................................................................... 49 Table 27. Mode Register Functionality .................................................................................................................... 50 Table 28. TAPEN Register Settings........................................................................................................................... 51 Table 29. TAPP Tap Pulse Register Settings ............................................................................................................. 52 Table 30. Drop Event Control Register Settings ...................................................................................................... 53 Table 31. SH_DB Shake Debounce Register Settings .............................................................................................. 54 mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3
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Table 32. Extended Accelerometer Registers.......................................................................................................... 55 Table 33. OUTCFG Resolution and Range Select Register Settings ......................................................................... 57 Table 34. SHAKE_TH Threshold Register Settings ................................................................................................... 64 Table 35. Up/Down Z-axis Threshold Register Settings .......................................................................................... 65 Table 36. Up/Down X-axis Threshold Register Settings .......................................................................................... 66 Table 37. Right/Left Z-axis Threshold Register Settings .......................................................................................... 67 Table 38. Right/Left Y-axis Threshold Register Settings .......................................................................................... 68 Table 39. Front/Back Z-axis Threshold Register Settings ........................................................................................ 69 Table 40. Drop Threshold Register Settings ............................................................................................................ 70 Table 41. TAP_TH Tap Threshold Register Settings ................................................................................................. 71 Table 42. Tap Demo Register Sequence .................................................................................................................. 73
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MC3410 3-Axis Accelerometer Preliminary Datasheet 14 REVISION HISTORY Date 2012-03 Revision APS-048-0010v1 Description First release. mCube Proprietary and Confidential. © 2012 mCube Inc. All rights reserved. APS-048-0010v1.3 72 / 73
MC3410 3-Axis Accelerometer Preliminary Datasheet
15 LEGAL
1. M-CUBE reserves the right to make corrections, modifications, enhancements, improvements and other changes to its products and to this document at any time and discontinue any product without notice. The information contained in this document has been carefully checked and is believed to be accurate. However, M-CUBE shall assume no responsibilities for inaccuracies and make no commitment to update or to keep current the information contained in this document. 2. M-CUBE products are designed only for commercial and normal industrial applications and are not suitable for other purposes, such as: medical life support equipment; nuclear facilities; critical care equipment; military / aerospace; automotive; security or any other applications, the failure of which could lead to death, personal injury or environmental or property damage. Use of the products in unsuitable applications are at the customer’s own risk and expense. 3. M-CUBE shall assume no liability for incidental, consequential or special damages or injury that may result from misapplication or improper use of operation of the product.
4. No license, express or implied, by estoppel or otherwise, to any intellectual property rights of M-CUBE or any third party is granted under this document.
5. M-CUBE makes no warranty or representation of non-infringement of intellectual property rights of any third party with respect to the products. M-CUBE specifically excludes any liability to the customers or any third party regarding infringement of any intellectual property rights, including the patent, copyright, trademark or trade secret rights of any third party, relating to any combination, machine, or process in which the M-CUBE products are used. 6. Examples of use described herein are provided solely to guide use of M-CUBE products and merely indicate targeted characteristics, performance and applications of products. M-CUBE shall assume no responsibility for any intellectual property claims or other problems that may result from applications based on the examples described herein 7. Information described in this document including parameters, application circuits and its constants and calculation formulas, programs and control procedures are provided for the purpose of explaining typical operation and usage. “Typical” parameters that may be provided in M-CUBE data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters including “Typicals,” must be validated for each customer application by customer’s technical experts. In no event shall the information described be regarded as a guarantee of conditions or characteristics of the products. Therefore, the customer should evaluate the design sufficiently as whole system under the consideration of various external or environmental conditions and determine their application at the customer’s own risk. M-CUBE shall assume no responsibility or liability for claims, damages, costs and expenses caused by the customer or any third party, owing to the use of the above information. is a trademark of M-CUBE, Inc.
M-CUBE and the M-CUBE logo are trademarks of M-CUBE, Inc., All other product or service names are the property of their respective owners. © M-CUBE, Inc. 2011. All rights reserved.
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