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HDC1080: Humidity value stuck with 100%, No change..!

Part Number: HDC1080

Dear TI,

we are using HDC1080DMBT part for environment air humidity and temperature measurement, during validation test (24x7)1 out of 4 sensors got stuck at 100% humidity after few hundred hours. Could not see any deposits over the window. What may be cause for this issue.

  • Hi William,
    As noticed on the data sheet the specification for RH operating range requires a Non-Condensing environment. It's possible that the reading got stuck at that value due to the condensation in the die and may be ok after all water evaporates.

    Please follow the recommendations on foot note (11) on page 5 of the data sheet:
    Recommended humidity operating range is 10% to 70% RH. Prolonged operation outside this range may result in a measurement offset. The measurement offset will decrease after operating the sensor in this recommended operating range.

    During your tests did you exposed the part to high temperatures for long time? Can you please quantify the time and temperatures?

    Regards,
    Jose