BMA253
Data sheet
Page 110
9.2 Sensing axes orientation
If the sensor is accelerated in the indicated directions, the corresponding channel will deliver a
positive acceleration signal (dynamic acceleration). If the sensor is at rest and the force of
gravity is acting along the indicated directions, the output of the corresponding channel will be
negative (static 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
Figure 28: Orientation of sensing axis
The following table lists all corresponding output signals on X, Y, and Z while the sensor is at
rest or at uniform motion in a gravity field under assumption of a ±2g range setting and a top
down gravity vector as shown above.
Table 25: Output signals depending on sensor orientation
t h g i r p u
Sensor Orientation
upright
(gravity vector )
Output Signal X
Output Signal Y
Output Signal Z
0g / 0LSB 1g / 1024LSB
0g / 0LSB -1g / -1024LSB
0g / 0LSB
0g / 0LSB
0g / 0LSB
0g / 0LSB
-1g / -1024LSB
0g / 0LSB 1g / 1024LSB
0g / 0LSB
0g / 0LSB
0g / 0LSB
0g / 0LSB
0g / 0LSB 1g / 1024LSB -1g / -1024LSB
BST-BMA253-DS000-01 | Revision 1.0 | August 2015
Bosch Sensortec
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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.
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