Bosch MAN-REG-X-08 Especificaciones Pagina 27

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Data sheet
BMA220
Page 27
BST-BMA220-DS003-08 | Revision 1.15 | August 2011 Bosch Sensortec
© 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.
5.7 Low-g detection
For freefall detection, the absolute values of the acceleration data of all axes are observed
(global criteria). A low-g situation is likely to occur when all axes fall below a lower threshold
low_th. The interrupt will be generated if the measured acceleration falls below the threshold
and stays below the hysteresis level low_th+low_hy for a minimum number of data points
(low_dur). Thus, the duration of a released interrupt is depending on the data sampling rate
which is related to the bandwidth.
Figure 10: Low-g interrupt detection
acceleration
low_dur
counter value
time
time
time
low_th
INT
(not latched)
low_th + low_hy
not latched
latched
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