BMA423 datasheet(3/129 Pages) BOSCH

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Data Sheet

BMA423

Page 3

BST-BMA423-DS000-00 | Version 1.0 | August 2017

Bosch Sensortec

BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.

Note: Specifications within this document are subject to change without notice.

Table of contents

SPECIFICATION.............................................................................................................................7

ABSOLUTE MAXIMUM RATINGS ..............................................................................................10

QUICK START GUIDE .................................................................................................................11

Note about using the BMA423: ................................................................................................. 11

First application setup examples algorithms: ............................................................................ 11

FUNCTIONAL DESCRIPTION .....................................................................................................15

4.1.

SUPPLY VOLTAGE AND POWER MANAGEMENT ......................................................................16

4.2.

DEVICE INITIALIZATION.........................................................................................................17

4.3.

POWER MODES...................................................................................................................18

4.4.

SENSOR DATA ....................................................................................................................20

Acceleration Data ..................................................................................................................... 20

Filter Settings ........................................................................................................................... 20

Accelerometer data processing for low power mode................................................................. 21

Data Ready Interrupt ................................................................................................................ 21

Temperature Sensor ................................................................................................................. 21

Sensor Time ............................................................................................................................. 22

Configuration Changes ............................................................................................................. 22

4.5.

FIFO..................................................................................................................................24

Frames ..................................................................................................................................... 24

Conditions and Details.............................................................................................................. 27

FIFO data synchronization........................................................................................................ 29

FIFO synchronization with external interrupts ........................................................................... 30

FIFO Interrupts ......................................................................................................................... 30

FIFO Reset............................................................................................................................... 30

4.6.

INTERRUPT FEATURES.........................................................................................................31

Global Configuration................................................................................................................. 31

Step Detector / Step Counter.................................................................................................... 33

Walking activity recognition....................................................................................................... 36

Tilt on Wrist............................................................................................................................... 37

Double tap / Tap detection ........................................................................................................ 40

Any Motion / No motion detection ............................................................................................. 41

4.7.

GENERAL INTERRUPT PIN CONFIGURATION ...........................................................................43

Electrical Interrupt Pin Behavior................................................................................................ 43

Interrupt Pin Mapping ............................................................................................................... 43

4.8.

AUXILIARY SENSOR INTERFACE............................................................................................44

Structure and Concept.............................................................................................................. 44

Interface Configuration ............................................................................................................. 44

Setup mode (AUX_IF_CONF.aux_manual_en =0b1)................................................................ 45

Data mode (AUX_IF_CONF.aux_manual_en=0) ...................................................................... 48

Delay (Time Offset) .................................................................................................................. 48

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