BMA145

Data sheet

Bosch Sensortec

4.6

Polarity of the acceleration output

If the sensor is accelerated into the indicated directions, the corresponding channels will deliver

a positive acceleration signal (dynamic acceleration).

Example: If the sensor is at rest or at uniform motion in a gravity field according to the figure

given below, the output signals are:

 ± 0g for the X channel

 ± 0g for the Y channel

 + 1g for the Z channel

+y

+z

top side

+x

gravity vector

The following table lists all corresponding output signals on Ax, Ay, and Az while the sensor is

at rest or at uniform motion in a gravity field under assumption of a top down gravity vector as

shown above.

Sensor orientation

(gravity vector

)

Output signal Ax

0g / 1.5V

-1g / 1.2V

0g / 1.5V

+1g / 1.8V

0g / 1.5V

0g / 1.5V

Output signal Ay

+1g / 1.8V

0g / 1.5V

-1g / 1.2V

0g / 1.5V

0g / 1.5V

0g / 1.5V

Output signal Az

0g / 1.5V

0g / 1.5V

0g / 1.5V

0g / 1.5V

+1g / 1.8V

-1g / 1.2V

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upright

Rev. 1.3

Page 14 / proprietary information

11 February 2010

© 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.