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HDC2022: humidity drift issue

Nan Zhang
Intellectual 1895 points
Part Number: HDC2022

Hi team，

     The customers are using the HDC2022 in their products. During their produce, hdc2022 are inevitably exposed to benzene when they manufacture assembled products. After that, they find humidity drift in hdc2022. Our humidity sensor absorb the benzene leading to the drift. After some test, customers find that the drift would decrease after heating. So they want to know:

    1.could they use the hdc2022 self-heating function to reduce the drift( The heat causes the sensor that has adsorbed benzene to re-release benzene， does it make sense)?

    2.do you have some ideas to solve this drift as much as possible?

YOURS

NAN

  • 0
    TI__Expert 8155 points

    Hello Nan,

    1. Yes running the heater can release and partially undo the effects of some chemical contaminants. It seems that the customer has already found that running the on-chip heater will reduce the humidity drfit somewhat, so doing this periodically or repeatedly will help reduce humidity drift. Do you know how much drift they saw with exposing the HDC2022 to benzene, and how much the humidity was improved by running the heater? If the customer ran the heater once and the humidity drift was partially corrected, running it an additional time could help reduce the drift further.

    2. To solve the drift, the best way is to reduce how much the HDC2022 is being exposed to drift. The HDC2022 should be the last component installed in the assembly process, this should minimize how much benzene it is exposed to. During the benzene exposure, doing so in a well ventilated space with a fresh air supply will help reduce humidity drift as well. Anything the customer can do to reduce exposure time to benzene and reduce the concentration of the benzene as well will help.

    Regards

    -Alex Thompson