BMA255 datasheet(30/119 Pages) BOSCH

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BMA255

Data sheet

Page 30

BST-BMA255-DS004-05 | Revision 1.2 | August 2014

Bosch Sensortec

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.

4.7.5.1 Enabling (disabling) for each axis

Any-motion detection can be enabled (disabled) for each axis separately by writing ´1´ (´0´) to

bits (0x16) slope_en_x, (0x16) slope_en_y, (0x16) slope_en_z. The criteria for any-motion

detection are fulfilled and the slope interrupt is generated if the slope of any of the enabled axes

exceeds the threshold (0x28) slope_th for [(0x27) slope_dur +1] consecutive times. As soon as

the slopes of all enabled axes fall or stay below this threshold for [(0x27) slope_dur +1]

consecutive times the interrupt is cleared unless interrupt signal is latched.

4.7.5.2 Axis and sign information of slope / any motion interrupt

The interrupt status is stored in bit (0x09) slope_int. The any-motion interrupt supplies additional

information about the detected slope. The axis which triggered the interrupt is given by that one

of bits (0x0B) slope_first_x, (0x0B) slope_first_y, (0x0B) slope_first_z that contains a value of

´1´. The sign of the triggering slope is held in bit (0x0B) slope_sign until the interrupt is

retriggered. If (0x0B) slope_sign = ´0´ (´1´), the sign is positive (negative).

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