Dear ST/Forum,
Preamble:
We are using the LPS22HBTR pressure-temperature sensor in some PCB assemblies.
The data sheet indicates a pressure reading range with defined accuracy from 260 to 1260hPA/millibar and an absolute maximum overpressure value of 2MPa (20000mbar).
We are using the sensor in a vacuum application, where we expect them to not be exposed to vacuum unless there is a leak in part of the assembly. From the data sheet, we have noted there is no minimum safe pressure defined but we naturally expect the pressure readings to be at least inaccurate below 260mbar as it falls outside of the range quoted as "accurate". However we note that readings are given that seem at least sensible down to about 1mbar and then when the pressure goes lower, the sensors starts to read 4096.159874325 or similar, with the digits to the right still decreasing. Lower still and 4096 changes to 4095. We have not continued to note the readings at these low pressures.
Temperature readings seem unaffected by exposure to vacuum.
Query:
Is there any information on data behaviour below 260mbar?
As there is no minimum pressure defined in the "absolute maximum" section of the data sheet, we assume vacuum will not damage the part? Please can you confirm.
Thanks in advance
Duncan
