Preliminary Datasheet
SMB365
Three-axis accelerometer
Bosch Sensortec
5.4
Acceleration Data Format
The description of the digital signal is "2's complement". From negative to positive accelerations, the
following sequence for the
±2g measurement range can be observed (±10g correspondingly):
-2.000g :
10 0000 0000
-1.996g :
10 0000 0001
...
-0.004g :
11 1111 1111
0.000g
:
00 0000 0000
+0.004g :
00 0000 0001
...
+1.992g :
01 1111 1110
+1.996g :
01 1111 1111
5.5
Self Test
The sensor features an on-chip self-test which can be activated by changing the corresponding self test
bit in the corresponding via SPI. The self test is realized by a physical deflection of the seismic mass due
to an electrostatic force. Thus, it provides full testing of the complete signal evaluation path including the
micromachined sensor structure and the evaluation ASIC.
The self test is activated by setting the self test activation bit to 1. The test works in all measurement
modes (2g, 10g, normal, low-power) and acts on all three channels simultaneously. The typical change in
output will be 300LSB in the 2g-mode and 60LSB in the 10g-mode. The self test response remains as a
static offset on the output as long as the self test register is not set back to 0.
While the self test is activated, any acceleration or gravitational force applied to the sensor will be
observed in the output signal as a superposition of both acceleration and self test signal.
Self Test Response
Output Signal [LSB]
Self Test Activation Bit
0
1
Rev. 1.2
Page 13
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copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
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