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Data sheet

BMA220

Page 11

BST-BMA220-DS003-08 | Revision 1.15 | August 2011 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.

4.1.3 Low-power mode dimensioning

The power saving that can be achieved depends on the programmed sleep duration and the

configured bandwidth. Figure 4 explains the power consumption in relation to the different ASIC

states (sleep and awake phases).

Figure 4: Sleep and awake phase

If a low bandwidth is selected, the time required for filter settling might be the dominating time.

Refer to table 2 for the appropriate dimensioning of the attainable current saving.

Table 4: Approximate awake phase times for 1 data sample

Filter cut-off Settling time

32 Hz 16690µs

64 Hz 8690µs

125 Hz 4690µs

250 Hz 2690µs

500 Hz 1690µs

1000 Hz 1190µs

4.1.4 Channel activation / de-activation

In order to optimize further power consumption of the BMA220, data evaluation of individual

axes can be deactivated. Per default, all three axes are active. If the user wants to disable one

or more axes, the appropriate en_?_channel bits at address 0x0F (SPI) / 0x1E (I

C) must be

set to ‘0’.

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Bosch MAN-REG-X-08 Spezifikationen Seite 11