BMA150 datasheet(13/56 Pages) BOSCH

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Data sheet

BMA150

Triaxial, digital acceleration sensor

Bosch Sensortec

Rev. 1.6

Page 13

30 October 2008

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.

If a not-latched interrupt is generated, the device waits in the normal mode till the interrupt

condition disappears. The minimum duration of interrupt activation is 330µs. If no interrupt is

generated, the sensor IC goes to sleep mode for a defined time (wake_up_pause).

For more details on the wake-up functionality, please refer to chapter 7.3

3.1.5 Wake_up_pause

These bits (address 15h, bit 2 and 1) define the sleep phase duration between each automatic

wake-up.

Table 5: Settings of wake_up_pause

wake_up_pause<1:0>

Sleep phase duration

20 ms

80 ms

320 ms

2560 ms

Note: The accuracy of the wake-up timer is about ±30%.

3.1.6 Shadow_dis

BMA150 provides the possibility to block the update of data MSB while LSB are read out. This

avoids a potential mixing of LSB and MSB of successive conversion cycles. When this bit

(address 15h, bit 3) is at 1, the blocking procedure for MSB is not realized and MSB only

reading is possible.

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