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TMDS181: Handling of the SCL_SRC/SDA_SRC Pin in the snoop option of ACTIVE DDC BLOCK

强 王
Prodigy 125 points

Part Number: TMDS181

Hi Team，

TMDS181 is used in our product.

The ACTIVE DDC BLOCK wants to be set to the snoop option.

SCL_SNK/SDA_SNK is connected to the DDC of SRC and SNK to implement the snoop function.

Do I understand it correctly?

What is the purpose of SCL_SRC/SDA_SRC grounding processing?

SCL_SRC/SDA_SRC is not used. Is it OK if the two pins are suspended? Is there a risk?

Please help to comment.

Thanks!

John

  • 0
    Prodigy 125 points

    Some of our products have been shipped, and the SCL_SRC/SDA_SRC pins of these products are suspended, and we need to assess their risks.

    Thank you!


  • 0 in reply to 强 王
    TI__Guru**** 193471 points

    Hi,

    Please see my response below

    SCL_SNK/SDA_SNK is connected to the DDC of SRC and SNK to implement the snoop function.

    Do I understand it correctly?

    *** Yes

    What is the purpose of SCL_SRC/SDA_SRC grounding processing?

    SCL_SRC/SDA_SRC is not used. Is it OK if the two pins are suspended? Is there a risk?

    *** SCL_SRC/SDA_SRC need to be connected to GND, otherwise noise could coupling onto them and cause TMDS181 not snooping correctly.

    Thanks

    David