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UCD9090A: About GPIO output logic

Tomoaki Imamatsu
Prodigy 30 points
Part Number: UCD9090A


Sometimes the output logic is different from the input condition.
(Please see the figure below)

Normal case

 


Abnormal case

In normal operation, the operation that PON_STEP 1 goes "L" when GPIO 17 goes "L", but PON_STEP 1 does not go to "L" but remains "H" in case of abnormality.

This phenomenon causes the system to stop and become a problem.
Is this phenomenon reported as occurring in other equipment as well?

  • 0
    TI__Guru 66380 points
    Are the conditions the same for both working and non-working case? Why was Yellow waveform different?
    Could you please share your poject file so that we can help futher on this?

    Regards
    Yihe
  • 0 in reply to yihe
    Prodigy 30 points
    In reply to yihe:

    Of course the conditions are the same.
    The yellow waveform is different because the green waveform at the case of abnormality does not change to "L".
    The condition of the yellow waveform is set to "H" when the green waveform changes to "L".
    The problem is that the green waveform does not change to "L".
    The project can not be sent due to confidential matter.

    Imamatsu