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HDC2022: Encapsulated in Epoxy

Jacob Wyrick
Expert 6205 points
Part Number: HDC2022

Hi team,

My customer are looking at using the HDC2022 in an outdoor environment where they'll need to coat the board in an epoxy resin.

Will the humidity sensor be able to function properly/read the relative humidity when covered or does the top-side of the device need to be exposed to the ambient, target environment?

If the HDC2022 does need to be exposed to the ambient environment, the E2E post, at the bottom of this message, outlines using a polyimide tape on the device that can be used to remove the epoxy after coating. Is this still the recommended method?

Are there any other methods that should be considered?

Are there any potential issues with this method of removing the coating?

https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/922806/hdc2021-protective-tape-vs-protective-cover-and-conformal-coating?tisearch=e2e-sitesearch&keymatch=HDC2022

Thanks,

Jacob

  • 0
    TI__Expert 3270 points

    Hi Jacob,

    The HDC2022 needs to be exposed to the ambient environment in order to measure the temperature and humidity accurately. You can use a polyimide tape over the filter during the coating process and it can be removed after. The residue from the adhesive should not enter the open cavity due to the presence of the IP67 filter.

    Regards,
    Pavani Tenneti