Datasheet

Data Sheet
BMA456
Page 19
BST-BMA456-DS000-01 | Version 1.1 | October 2017 Bosch Sensortec
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Note: Specifications within this document are subject to change without notice.
The auxiliary sensor functionality is supported only when the auxiliary interface is connected for the
auxiliary sensor operation. If the auxiliary interface is not used for auxiliary sensor operation, then the
auxiliary sensor interface must remain disabled by setting PWR_CTRL.aux_en=0b0 (default).
To change the power mode of the auxiliary sensor, both the power mode of the auxiliary interface and
the auxiliary sensor part needs to be changed, e.g. to set the auxiliary sensor to suspend mode:
 Set the auxiliary sensor interface to suspend in Register PWR_CTRL.aux_en=0b0. Changing
the auxiliary sensor interface power mode to suspend does not imply any mode change in the
auxiliary sensor.
 The auxiliary sensor part itself must be put into suspend mode by writing the respective
configuration bits of the auxiliary sensor part. The power mode of the auxiliary sensor part is
controlled by setting the BMA456 auxiliary sensor interface into manual mode by
AUX_IF_CONF.aux_manual_en=0b1 and then communicating with the auxiliary sensor part
through the BMA456 registers AUX_RD_ADDR, AUX_WR_ADDR, and AUX_WR_DATA. For
details see Chapter 4.8.