Datasheet

Preliminary Data Sheet
BMA400
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BST-BMA400-DS000-00 | Version 0.1 | November 2017 Bosch Sensortec
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Note: Specifications within this document are subject to change without notice.
Auto low-power mode
Power mode can be changed from Normal to Low-power mode through a serial interface command.
It is also possible to change automatically (without a serial command) from normal mode to low-power
mode, called auto low-power.
The following timed and non-timed triggers are supported for automatic switching from Normal mode
to Low-power mode:
• First data ready: (AUTOLOWPOW_1.auto_lp_timeout =b00)
If AUTOLOWPOW_1.drdy = ‘1’, BMA400 is set into low-power mode when new data
calculation is finished.
• Generic interrupt 1: (AUTOLOWPOW_1.auto_lp_timeout =b00)
If AUTOLOWPOW_1.gen1_int = ‘1’, BMA400 is set into Low-power mode as soon as
the Generic interrupt 1 is detected. (see chapter 4.6)
• low_power_timeout (AUTOLOWPOW_1.auto_lp_timeout =b01): the sensor is set into
low-power mode as soon the timeout counter reaches
AUTOLOWPOW_1.auto_lp_timeout_thres. The auto-low-power timeout counter is 12
bits wide and is incremented every 2.5ms.
• low_power_timeout with counter reset on activity detected
(AUTOLOWPOW_1.auto_lp_timeout =b10,b11): the timeout counter is restarted in
case generic interrupt 2 (see chapter 4.6) is asserted.
The sensor is set into low-power mode when finally the timeout counter reaches
AUTOLOWPOW_1.auto_lp_timeout_thres. The auto-low-power timeout counter is 12
bits wide and is incremented every 2.5ms.
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