BMA253
Data sheet
Page 22
The public offset compensation registers (0x38) offset_x, (0x39) offset_y, (0x3A) offset_z are
images of the corresponding registers in the NVM. With each image update (see section 4.6
Non-volatile memory for details) the contents of the NVM registers are written to the public
registers. The public registers can be over-written by the user at any time. After changing the
contents of the public registers by either an image update or manually, all 8bit values are
extended to 12bit values for internal computation. In the opposite direction, if an internally
computed value changes it is converted to an 8bit value and stored in the public register.
Depending on the selected g-range the conversion from 12bit to 8bit values can result in a loss
of accuracy of one to several LSB. This is shown in figure 5.
In case an internally computed compensation value is too small or too large to fit into the
corresponding register, it is saturated in order to prevent an overflow error.
By writing ´1´ to the (0x36) offset_reset bit, all offset compensation registers are reset to zero.
BST-BMA253-DS000-01 | Revision 1.0 | August 2015
Bosch Sensortec
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Note: Specifications within this document are subject to change without notice.
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