Application Note

Bosch Sensortec

BlueBox Demo-Board for the digital sensors AN18002

SMB365 (acceleration) and SMD500 (pressure)

23. Hysteresis and Threshold level settings

•for global interrupt conditions

oThreshold and Hysteresis for all axes are given in digits (d) of a 7bit word

o1d corresponds to 4 LSB (16mg in low g mode and 0.08g in high g mode)

•for axis individual interrupt conditions

oThreshold for each axis is given in digits (d) of a 5bit word

o1d corresponds to 16 LSB (64mg in low g mode and 0.32g in high g mode) o Hysteresis for each axis is given in digits (d) of a 3 bit word

o 1d corresponds to 64 LSB (256mg in low g mode and 1.28g in high g mode)

24.Selftest selection

•Off/On (disable/enable) selftest to check signal evaluation path (MEMS plus ASIC)

25.Interrupt signal output LED

•LED off = interrupt inactive; LED on = interrupt active

•No software-function but direct readout of the SMB365 internal interrupt logic pin

26.Acceleration signal output screen

•Acceleration sensitive digital signal, given in LSB, g or m/sec²

•1LSB corresponds to 4mg in low g mode and 20mg in high g mode

27.Ordinate unit selection (acceleration)

•choose proper unit of acceleration sensor output signal (g, m/s² or LSB)

28.Output signal reference color

• X-axis = green

Y-axis = yellow

Z-Axis = red

29.Ordinate scale selection (acceleration)

•full scale: ±512LSB, ±20m/s² or ±2g in 2 g range (resolution: 1LSB = 4mg)

•full scale: ±512LSB, ±100m/s² or ±10g in 10g range (resolution: 1LSB = 20mg)

30.Abscissa scale selection (timebase)

•select from 2000 to 50 msec/div

Rev. 1.0

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