Information

BMA280
Data sheet
Page 110
BST-BMA280-DS000-11 | Revision 1.8 | August 2014 Bosch Sensortec
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Note: Specifications within this document are subject to change without notice.
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
Sensor Orientation
(gravity vector )
Output Signal X
0g / 0LSB
1g / 4096LSB
0g / 0LSB
-1g / -4096LSB
0g / 0LSB
0g / 0LSB
Output Signal Y
-1g / -4096LSB
0g / 0LSB
1g / 4096LSB
0g / 0LSB
0g / 0LSB
0g / 0LSB
Output Signal Z
0g / 0LSB
0g / 0LSB
0g / 0LSB
0g / 0LSB
1g / 4096LSB
-1g / -4096LSB
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