BMA250
Data sheet
Bosch Sensortec
Rev. 1.0 Page 4 / not for publishing 03 March 2011
© 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.
Index of Contents
1. SPECIFICATION...................................................................................................................................... 7
2. ABSOLUTE MAXIMUM RATINGS.......................................................................................................... 9
3. BLOCK DIAGRAM................................................................................................................................. 10
4. FUNCTIONAL DESCRIPTION............................................................................................................... 10
4.1 POWER MANAGEMENT ......................................................................................................................... 10
4.2 OPERATIONAL MODES ......................................................................................................................... 11
4.2.1 General mode............................................................................................................................. 12
4.2.2 Dedicated mode (μC-less or stand-alone mode)....................................................................... 12
4.3 POWER MODES.................................................................................................................................... 14
4.4 SENSOR DATA..................................................................................................................................... 16
4.4.1 Acceleration data ....................................................................................................................... 16
4.4.2 Temperature data....................................................................................................................... 17
4.5 SELF-TEST .......................................................................................................................................... 18
4.6 OFFSET COMPENSATION ...................................................................................................................... 18
4.6.1 Slow compensation .................................................................................................................... 20
4.6.2 Fast compensation..................................................................................................................... 21
4.6.3 Manual compensation ................................................................................................................ 21
4.6.4 Inline calibration ......................................................................................................................... 21
4.7 NON-VOLATILE MEMORY ...................................................................................................................... 22
4.8 INTERRUPT CONTROLLER..................................................................................................................... 22
4.8.1 General features ........................................................................................................................ 23
4.8.2 Mapping (inttype to INT Pin#) .................................................................................................... 24
4.8.3 Electrical behaviour (INT pin# to open-drive or push-pull) ........................................................ 24
4.8.4 New data interrupt...................................................................................................................... 25
4.8.5 Any-motion (slope) detection ..................................................................................................... 25
4.8.5.1 Enabling (disabling) for each axis........................................................................................... 26
4.8.5.2 Axis and sign information of any motion interrupt................................................................... 26
4.8.5.3 Serial interface and dedicated wake-up mode........................................................................ 26
4.8.6 Tap sensing................................................................................................................................ 26
4.8.6.1 Single tap detection................................................................................................................. 28
4.8.6.2 Double tap detection ............................................................................................................... 28
4.8.6.3 Selecting the timing of tap detection....................................................................................... 28
4.8.6.4 Axis and sign information of tap sensing ................................................................................28
4.8.6.5 Tap sensing in low power mode ............................................................................................. 29
4.8.7 Orientation recognition............................................................................................................... 29
4.8.7.1 Orientation blocking ................................................................................................................ 32
4.8.8 Flat detection.............................................................................................................................. 33
4.8.9 Low-g interrupt ........................................................................................................................... 34
4.8.10 High-g interrupt ........................................................................................................................ 34
4.8.10.1 Axis and sign information of high-g interrupt ........................................................................ 35