IAM-20381
5 Programmable Interrupts .................................................................................................................................. 21
Wake-on-Motion Interrupt .....................................................................................................................21
6 Digital Interface ................................................................................................................................................. 22
I2C and SPI Serial Interfaces ....................................................................................................................22
I2C Interface.............................................................................................................................................22
IC Communications Protocol...................................................................................................................22
I2C Terms .................................................................................................................................................24
SPI Interface ............................................................................................................................................25
7 Serial Interface Considerations.......................................................................................................................... 26
IAM-20381 Supported Interfaces............................................................................................................26
8 Register Map...................................................................................................................................................... 27
9 Register Descriptions ......................................................................................................................................... 29
Registers 13 to 15 – Accelerometer Self-Test Registers..........................................................................29
Register 25 – Sample Rate Divider ..........................................................................................................29
Register 26 – Configuration.....................................................................................................................29
Register 28 – Accelerometer Configuration............................................................................................30
Register 29 – Accelerometer Configuration 2.........................................................................................31
Register 31 – Wake-on Motion Threshold (Accelerometer) ...................................................................32
Register 35 – FIFO Enable........................................................................................................................32
Register 54 – FSYNC Interrupt Status......................................................................................................32
Register 55 – INT/DRDY Pin / Bypass Enable Configuration....................................................................32
Register 56 – Interrupt Enable............................................................................................................33
Register 58 – Interrupt Status.............................................................................................................33
Registers 59 to 64 – Accelerometer Measurements ..........................................................................33
Registers 65 and 66 – Temperature Measurement............................................................................34
Register 104 – Signal Path Reset.........................................................................................................34
Register 105 – Accelerometer Intelligence Control............................................................................34
Register 106 – User Control................................................................................................................35
Register 107 – Power Management 1 ................................................................................................35
Register 108 – Power Management 2 ................................................................................................35
Registers 114 and 115 – FIFO Count Registers ...................................................................................36
Register 116 – FIFO Read Write..........................................................................................................36
Register 117 – Who Am I ....................................................................................................................36
Registers 119, 120, 122, 123, 125, 126 Accelerometer Offset Registers............................................37
10 Assembly............................................................................................................................................................ 38
Orientation of Axes.............................................................................................................................38
Package Dimensions ...........................................................................................................................39
11 Part Number Package Marking .......................................................................................................................... 41
12 Reference........................................................................................................................................................... 42
13 Revision History ................................................................................................................................................. 43
Document Number: DS-000216
Revision: 1.0
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