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HDC3022: HDC3022 accuracy issue from different units...

Peter Tseng
Mastermind 6180 points
Part Number: HDC3022

Hi Sir,

Customer tested HDC3022 5 pcs and found 1 unit has a big error accuracy compared with others.

May I know how TI does the QC for HDC3022? 100% test, sampling test or any other QC test methods?

Is there any documents for it?

Thanks.

  • 0
    TI__Genius 12195 points

    Peter,

    Can you please tell me a little more about the test setup? Since you are seeing that the temperature is just slightly higher, I believe that particular sensor is being heated. Either self-heating from communications, or it is picking up some heat from somewhere on the PCB or the environment. Were these tested in an oil bath? Or an oven? And the dark blue line is the calibrated reference?

    TI tests all of its HDC302x sensors for temperature accuracy and humidity accuracy in production. I will see what I can share publicly.

    Thanks

    -Alex Thompson

  • 0 in reply to Alex Thompson
    Mastermind 6180 points

    Hi SIr,

    Yes, the dark blue line is the reference curve.

    Customer uses the chamber to test and here is the chamber information and test configuration photo which the reference device is in the center. Other white devices are HDC3022.

    http://www.giant-force.com.tw/en/product02_en.aspx?CategoryNo=1&PrdtNo=1

    Please help to input your comments.

    Thanks.

  • 0 in reply to Peter Tseng
    TI__Genius 12195 points

    Peter,

    Thank you for the picture, it is very helpful to see. Which of the white assemblies is the HDC3022 that is slightly warmer? 

    Thanks

    -Alex Thompson

  • 0 in reply to Alex Thompson
    Mastermind 6180 points

    Hi Sir,

    The issue device is no.478 and the location is as below.

    And customer also test in fiexed 20degreeC and the test is OK.

    It seems the issue only occurred in cool down test.

  • 0 in reply to Peter Tseng
    TI__Expert 4850 points

    Hello Peter,

    Thanks for that information. Would it be possibly to try swapping the position of no.478 (the one which originally showed accuracy issues) with another assembly in the chamber and running the cooldown process again to see if the problem persists? And could you also attach a photo labeling all the assemblies listed in the test results chart? This would be really helpful to better understand your setup.

    Regards,

    Harry