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HDC2022: Recommended Operating Conditions

Brian Wang0928
Genius 14150 points
Part Number: HDC2022

Team, in the recommended operating conditions of d/s, we'd like to know why the temp range is differnce between these 3 items? and what's the design consideration in practical case? thanks.

  • 0
    TI__Genius 12395 points

    Brian,

    The HDC2022 needs multiple recommended operating temp ranges because each of its features has a different useful range. The temp sensor can be used across the full range of the device, so that's why its -40C to 125C. The heater isnt going to be able to heat the part past 85C in most scenarios, so if ambient temp exceeds 85C, the heater wont do anything. Hence, its temp range is -40C to 85C. The humidity sensor should not be used above 70C because higher temps can act as a bake which will create a negative shift in RH accuracy, and RH isnt a useful measurement below -20C, so thats why its range is -20C to 70C.

    If you want to use all the features of the HDC2022 confidently, I would personally stick to 0C to 70C. The RH reads will function at -20C but any polymer based RH sensor isnt likely to give useful data below 0C.

    Regards

    -Alex Thompson