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HDC1080: Relation between HDC1080 Output Accuracy and Reflow Temperature

Part Number: HDC1080

Dear Jose-san,

Marubun refrow.pptx

Thank you for your special support.

In the HDC 1080 of the customer, there is an error in the accuracy of the output,

I am looking for ways to solve this.

As one of the factors, we believe that the reflow temperature is attributable to it.

I have two questions.

The customer implements the HDC 1080 with the attached reflow profile.

The peak temperature is low compared to TI's recommendation, but if this temperature is low,

Is there a possibility that the moisture absorption of the device is insufficient and the IC absorption value varies after mounting?

This IC absorbs moisture because it is a capacitive coupling type, but even with an IC that was deviated by about 5% in humidity precision,

by removing moisture againIs it possible to think that the accuracy of humidity returns to 1-2% based on it?

If so, does the same phenomenon occur with the heater function of the HDC1080?

Best,Regars.

Fukazawa

  • Hi Fukazawa-san,
    Will have to check with our humidity sensors experts if such correlation between reflow temperature and RH accuracy.
    So far we were not exposed to that type of behavior but will check it anyway.

    Regards,
    Jose
  • Hello Jose-san,

    Thank you for your support many times.
    Did you get answers on the relationship between reflow temperature and output accuracy?
    It is prompted by the customer.

    Best Regars.
    Fukazawa
  • Hello Fukazawa-san,

    After discussions with my colleagues we concluded that the reflow profile used by your customer doesn't have any impact on RH accuracy or sensor integrity. Even though this temperature profile used lower values than the recommended ones, the difference is negligible from a moisture absorption perspective.

    Unless there was extensive exposure to high temps/ high RH levels (85C/85% as described in section 9.3.3 of the data sheet) the sensor should recover the original accuracy. Please notice that +/-2%RH is a typical value and not guaranteed across all conditions/ parts. 5%RH is a possible value on some units.


    Regards,
    Jose