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Linux/TPD12S016: HDMI ESD CHIP-DDC EDID read Error

Part Number: TPD12S016

Tool/software: Linux

Hi,

We are using "TPD12S016PWR" ESD IC with HDMI Transmitter "SiI9022ACNU" IC Combination in our Design.
While testing HDMI Interface we are facing DDC EDID read Error.
After removing the ESD IC and done direct wiring from HDMI Transmitter IC to HDMI Connector, it is working without any issues(EDID Read passes).
We are suspecting that with ESD Chip is not meeting the I2C timing specification.

What are the timing which TPD12S016PWR" is violating?

Could you please suggest how to solve the above mentioned issue.

Thanks

Jaffir

7 Replies

  • Jaffir,

    What else do you have connected to the I2C line? Could you send a schematic and a two waveforms of the signal, one with the ESD device connected and one without it.

    Regards,
    Cameron
  • In reply to Cameron Phillips:

    Hi Cameron,

    Please see my answers in line.

    What else do you have connected to the I2C line?
    Ans: We have connected only the HDMI Transmitter to the I2C lines. No other devices are connected to I2C lines

    Could you send a schematic
    Ans: I have shared the Schematics of HDMI Transmitter"SiI9022ACNU" and ESD Chip "TPD12S016PWR" section.

    And a two waveforms of the signal, one with the ESD device connected and one without it.
    Ans: Yes I have shared the two waveforms of the signal's.
    one is with ESD(DDC EDID read Error) and another one is without ESD(EDID Read passes).

    Regards,

    Jaffir

  • In reply to Jaffir Mohammed:

    Hi Cameron,

    Any update on the above issue.

    Regards,

    Jaffir

  • In reply to Jaffir Mohammed:

    Sorry for the delay.

    What might be going on is the common mode choke you have between the controller and the TPD12S016 is lowering the bandwidth of the TPD12S016. Try it without the CMC's and see if it still has the error.

    Regards,
    Cameron
  • In reply to Cameron Phillips:

    Hi Cameron,

    Common mode chokes are used only on HDMI lines not on the I2C lines.
    We are facing the issue on I2C DDC EDID read Error.

    Thanks
    Jaffir
  • In reply to Jaffir Mohammed:

    Hi Cameron,

    Any update on the above issue.

    Thanks

    Jaffir

  • In reply to Jaffir Mohammed:

    Jaffir,

    I'm sorry I have been stretched thin.
    I cannot replicate your exact issue but I believe the IO capacitance for this device is 15pF which might be too high for your system.
    3 TPD4E05U06's could protect all of those lines and has a capacitance of 0.5pF.

    If you need the level shifter TI has many of those.
    Let me know of anything else.

    Regards,
    Cameron

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