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LPS22HBTR Datasheet(PDF) 35 Page - STMicroelectronics

Part # LPS22HBTR
Description  MEMS nano pressure sensor: 260-1260 hPa absolute digital output barometer
PDF  49 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LPS22HBTR Datasheet(HTML) 35 Page - STMicroelectronics

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LPS22HB
Register description
49
Figure 21. “Threshold based” interrupt event
If the AUTOZERO bit is set to '1', the measured pressure is used as the reference in the
register REF_P (15h, 16h and 17h). From that point on, the output pressure registers
PRESS_OUT (28h, 29h and 2Ah) are updated and the same value is also used for the
interrupt generation:
–
PRESS_OUT = measured pressure - REF_P
–
P_DIFF_IN = measured pressure - REF_P
After the first conversion, the AUTOZERO bit is automatically set to '0'. To return back to
normal mode, RESET_AZ bit has to be set to '1'. This resets also the content of the REF_P
registers.
If the AUTORIFP bit is set to '1', the measured pressure is used as the reference in the
register REF_P (15h, 16h and 17h). From that point on, the value used for the interrupt
generation is the following:
–
P_DIFF_IN = measured pressure - REF_P
The output registers PRESS_OUT (28h, 29h and 2Ah) show the difference between the
measured pressure and the content of the RPDS registers (18h and 19h):
–
PRESS_OUT = measured pressure - RPDS
After the first conversion, AUTORIFP bit is automatically set to '0'. To return back to normal
mode, the RESET_ARP bit has to be set to '1'.



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