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DS90UH948-Q1: DS90UH949-Q1 touch panel

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Replies: 5

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Part Number: DS90UH948-Q1

Dear TI Exprts

Our customer is using  serializer  DS90UH949-Q1  and  deserializer is DS90UH948-Q1 and a touch panel over I2C of the deserializer(DS90UH948-Q1).

Now they met with a problem need your help: Touch Panel  cannot be used normally

At most of the time, touch panel can work normally, but sometimes it cannot be used,rebooting the system will return to normal.

When the touch panel cannot be used, the I2C CLK of  949  is pulled to 0V; the I2C CLK and data  of 948 are normal(High)

Can you give me any advices? Thank you very much~

 

Best Regards

  • Hello Qianqian,

    Would it be possible for you to send us a scope capture or logic analyzer trace showing the I2C traffic when this issue occurs?

    Also can you share any programming steps you are using for 949/948?

    Best Regards,

    Casey 

  • In reply to Casey McCrea:

    Hi Qianqian,

    Haven't heard from you in a while - hopefully no news is good news and the issue is now resolved.  If so, to help enable others that may have the same question find the correct answer, please press the green 'this resolved my issue' button.

    If not, please provide the information requested by Casey and let us know what other issues related to the original question remain.

    Sincerely,
    Bryan Kahler

  • In reply to Bryan Kahler:

    HI Bryan

    Thanks for your attention~

    Because the fail rate is very low,maybe we need wait for the next failure

    Do you have anyother suggestions we can try?

    Best Regards

  • In reply to Qianqian:

    Hi Qianqian,

    Is the device clock stretching?  How long is the line being held low for?

    When you are able to see the problem again - which device on the bus is holding the clk line low?

    Sincerely,
    Bryan Kahler

  • In reply to Bryan Kahler:

    Hello Qianqian,

    Any updates here? Was the issue resolved?

    Best Regards,

    Casey