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HDC2010: The application issues of chips

Jimmy Huang
Genius 3515 points
Part Number: HDC2010
Other Parts Discussed in Thread: STRIKE

Tool/software:

May I ask a question?  Generally, temperature and humidity sensors on products are exposed or have waterproof and breathable membranes added, mainly for the consideration of measurement accuracy.  However, this basically fails to meet the ESD air discharge test requirements.  Do you have any good suggestions?Please provide your detailed suggestions and explain the principle



Static electricity can directly hit the chip.  Generally, TVS protection measures are ineffective

  • 0
    TI__Genius 11815 points

    Hi Jimmy,

    For all our humidity sensors, we perform reliability testing with the Human Body Model and Charged Device Model for ESD during the product qualification to ensure the sensors can withstand ESD. However you are correct that that the TVS diodes are not going to protect against ESD events that directly strike the center cavity. It's important to note though that the sensing electrode is not directly exposed to the air, there is mold compound covering most of the die, and a polymer layer that covers the sensing element. The polymer layer has a high dielectric breakdown voltage, so that offers some protection as well. Unfortunately there is some inherent ESD risk to using any humidity sensor because of the open cavity, but we have sold these sensors for years without customers having ESD issues, so I don't consider it to be a major concern.

    Regards

    -Alex Thompson