Datasheet

Data Sheet
BMA456
Page 3
BST-BMA456-DS000-01 | Version 1.1 | October 2017 Bosch Sensortec
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
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
1. SPECIFICATION ............................................................................................................................. 7
2. ABSOLUTE MAXIMUM RATINGS .............................................................................................. 10
3. QUICK START GUIDE ................................................................................................................. 11
Note about using the BMA456: ................................................................................................. 11
First application setup examples algorithms: ............................................................................ 11
4. 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