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Modifications reserved | Data subject to change without notice

Document number: BST-BMA400-DS000-13 Revision_2.2_012025

Interrupt engine overrun

The interrupt overrun is asserted if filter and interrupt computations cannot be finished in a sample

acquisition time. The interrupt status is mapped (mirrored) to all interrupt registers INT_STAT0,

INT_STAT1 and INT_STAT2, bit ieng_overrun_stat. The interrupt is cleared by reading of any of these

registers.

The interrupt is mapped to pads INT1 and INT2 by the registers INT1_MAP.

ieng_overrun_int1 and INT2_MAP. ieng_overrun_int2.

The interrupt behavior is not dependent on non-latch, latch mode setting.

If this occurs, advanced interrupts of less importance must be disabled until the Interrupt engine

overrun vanishes.

Orientation change interrupt

The orientation-change interrupt is enabled by (INT_CONFIG0.orientch_int) = 1.

The interrupt is optimized to detect a (screen) orientation change when the product is used in a

wearable device or similar application.

The orientation change is evaluated by monitoring the acceleration change in X/Y/Z direction (each

individually selectable). The orientation change is evaluated as difference to the last stable orientation

stored in the reference registers.

The orientation changed interrupt is generated as soon as the orientation change condition is fulfilled

on one of the enabled axes selected by (ORIENTCH_CONFIG0.orient_X/Y/Z_en).

The orientation change interrupt supports two input acceleration data streams for evaluation: acc_filt2;

and the low-pass filtered data source with 1Hz cut-off frequency acc_filt_lp

ORIENTCH_CONFIG0.data_src

Data source for Interupt

acc_filt2

acc_filt_lp

The threshold for the orientation change interrupt can be configured in the register

ORIENTCH_CONFIG1.orient_thres. The threshold configuration has 8 bits and a resolution of

8mg/LSB. In case the acceleration is above the reference acceleration stored for last position for

defined period of time ORIENTCH_CONFIG3.orient_dur; the BMA400 orientation change condition is

true.

The minimum duration of a new orientation (which shall trigger an interrupt) can be configured in the

10ms/LSB.

When the duration condition is fulfilled, the reference orientation is updated according to the

configuration stored in the Register (ORIENTCH_CONFIG0.orient_refu). The reference update mode

supports following modes:



no automatic update at all, the reference orientation will be updated by the user when needed



update with output from filter acc_filt2



update with output from filter acc_filt_lp

BMA400 Datasheet(PDF) 44 Page - Bosch Sensortec GmbH

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