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BMC156 Datasheet(PDF) 33 Page - Bosch Sensortec GmbH

Part # BMC156
Description  6-axis eCompassBMC156: Data sheet
PDF  141 Pages
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Manufacturer  BOSCH [Bosch Sensortec GmbH]
Direct Link  https://www.bosch-sensortec.com
Logo BOSCH - Bosch Sensortec GmbH

BMC156 Datasheet(HTML) 33 Page - Bosch Sensortec GmbH

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Data sheet
eCompass BMC156
Page 33
BST-BMC156-DS000-01 | Revision 1.0 | July 2014
Bosch Sensortec
© 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. Not intended for publication.
4.5 Accelerometer offset compensation
Offsets in measured acceleration signals can have several causes but they are always
unwanted and disturbing in many cases. Therefore, the accelerometer part of BMC156 offers an
advanced set of four digital offset compensation methods which are closely matched to each
other. These are slow, fast, and manual compensation, and inline calibration.
The compensation is performed with unfiltered data, and is then applied to both, unfiltered and
filtered data. If necessary the result of this computation is saturated to prevent any overflow
errors (the smallest or biggest possible value is set, depending on the sign). However, the
registers used to read and write compensation values have only a width of 8 bits.
An overview of the offset compensation principle is given in
Figure 7:
Figure 7: Principle of offset compensation
1g
7.8mg
15.6mg
31.2mg
62.5mg
125mg
250mg
500mg
Sign
3.9mg
1.9mg
0.97mg
1g
7.8mg
15.6mg
31.2mg
62.5mg
125mg
250mg
500mg
Sign
3.9mg
1.9mg
2g
1g
7.8mg
15.6mg
31.2mg
62.5mg
125mg
250mg
500mg
Sign
3.9mg
2g
4g
Sign
1g
7.8mg
15.6mg
31.2mg
62.5mg
125mg
250mg
500mg
8g
2g
4g
MSB
MSB
MSB
MSB
LSB
LSB
LSB
LSB
-
+-2g
+-4g
+-8g
+-16g
Sign
MSB
LSB
7.8mg
15.6mg
31.2mg
62.5mg
125mg
250mg
500mg
Read/
Write
12 bit acceleration data range
I2C/SPI/NVM mapping



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