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TCA9517: Monitoring the activity of the HDMI DDC bus

Roy Hsu
Genius 9400 points
Part Number: TCA9517


Hi Team,

My customer wants to monitor the HDMI DDC bus between the video source and sink, so I recommended them the TCA9517 as a buffer.

Basically, we want the MCU to be able to see the transactions between the PC and the monitor.

Do you think this configuration work?

Thanks!

Roy Hsu

  • 0
    TI__Guru 74961 points
    Hello Roy,

    TCA9517 has a static voltage offset on the B side and thus buffers cannot be connected to each other's static voltage offsets. Therefore you should not connect the B sides of the devices together. A-B is okay and A-A is okay but not A-B.

    Can you also specify what voltages and max frequency?

    Thanks,
    -Bobby
  • 0 in reply to BOBBY
    TI__Genius 9400 points

    Hi Bobby,

    1. I don't think there's any B-B connection in the diagram... Could you point out the connection you're talking about?

    2. The DDC bus should be rated at 5V and the frequency is 400 kHz.

    Thanks!

    Roy Hsu

  • 0 in reply to Roy Hsu
    TI__Guru 74961 points
    Hey Roy,

    1. Your new diagram looks correct with TCA9517's A to A side together and I do not see any problems.

    2. TCA9517 meets the requirements you've specified.

    Thanks,
    -Bobby