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LPS25HB to LPS25H Temperature Difference

Question asked by Matthias Schranz on Dec 18, 2017
Latest reply on Dec 20, 2017 by Miroslav B

We are currently replacing the LPS331AP in our design. we favour the the LPS25HB. i'm working with the STEVAL-MKI165V1 Kit, which is directly connected to our board.
 The pressure seems to be in a reasonable range but the temperature readings are really off.
The LSP25HB measures a temperature of only 18.06°C while the old LPS331AP measures 23.53°C and the LSP25H measures 22.8°C.
The datasheet states a accuracy of +/- 2°C. Which is true for LPS25H, but the LPS25HB is 6 °C off.I found no difference in software (referring to the datasheet) between LPS25HB and LPS25H regarding initialization or conversation.

Why is there such a big temperature difference? The temperature measurement is quite important for us, and we do not have the space to put an extra temperature sensor on the board.

We even bought a second evaluationkit of the LPS25HB to verify our measurements. and they are both too low.

Thank you for your help!

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