Application Note
Bosch Sensortec
BlueBox
SMB365 (acceleration) and SMD500 (pressure)
How to perform a SMB365 Selftest:
•Put the BlueBox in a stable
•Select Operation Mode (example refers to
•Select acceleration range (example refers to low g Mode) [21]
•Scale ordinate [27], [29] and abscissa [30] (example refers to ±512 LSB full scale, in 2g range)
•Start data acquisition [8]
•Wait a few seconds
•Activate Selftest (Selftest On) [24]
•Wait a few seconds
•Deactivate Selftest (Selftest Off) [24]
•Stop data acquisition [9]
•Interpret selftest by comparing LSB signals
A successful test shows a rising edge (signal ad on) while activating the Selftest function and a falling edge (signal subtraction) while activating the Selftest function at every axis on the acceleration signal output screen. Dependent on sensor, acceleration range and axis, the test signal should respond a LSB value within the specified tolerance level in a stable neutral- horizontal position of the board.
Acceleration range | Axis | Successful selftest signal | |
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Low g (± 2g) | X and Y | see related sensor datasheet | |
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Z | see related sensor datasheet | ||
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High g (± 10g) | X and Y | see related sensor datasheet | |
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Z | see related sensor datasheet | ||
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Rev. 1.0 | Page 41 |
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