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Application Note
BlueBox Demo-Board for the digital sensors
SMB365 (acceleration) and SMD500 (pressure)
Bosch Sensortec
AN18002
Rev. 1.0
Page 41
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7211RB11.
How to perform a SMB365 Selftest:
• Put the BlueBox in a stable neutral-horizontal position
• Select Operation Mode (example refers to Normal-Power Mode) [20]
• 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
X and Y see related sensor datasheet
Low g (± 2g)
Z see related sensor datasheet
X and Y see related sensor datasheet
High g (± 10g)
Z see related sensor datasheet