ADV7626

When the ADV7626 has no power supply is it necessary to add additional circuitry to hold the hot plug detect line low in order to stop a connected computer attempting to read the EDID from the ADV7626? This was necessary on the ADV7611 HDMI receiver.

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  • Sorry, I mean HPA on the receive side - my apologies for the confusion.

    Attached is the Analog Devices schematic for the ADV7611 eval board.

    On the first page, second block is the circuit that I refer too.

    When there is no power on the eval board the MOFSET Q2 holds HPA_A line to ground – this circuit stops an attached computer from attempting to read the internal ADV7611 EDID. If there is no power on the eval board the HPA_A line would be high (via R49, Block 1)) without the MOSFET circuit.

    My question is does the ADV7626 require the same MOSFET circuit as it has an internal EDID.

    I hope my understanding is correct.

    Regards

    Will Haylock

    adv7611ebz_b_rec.pdf
Reply
  • Sorry, I mean HPA on the receive side - my apologies for the confusion.

    Attached is the Analog Devices schematic for the ADV7611 eval board.

    On the first page, second block is the circuit that I refer too.

    When there is no power on the eval board the MOFSET Q2 holds HPA_A line to ground – this circuit stops an attached computer from attempting to read the internal ADV7611 EDID. If there is no power on the eval board the HPA_A line would be high (via R49, Block 1)) without the MOSFET circuit.

    My question is does the ADV7626 require the same MOSFET circuit as it has an internal EDID.

    I hope my understanding is correct.

    Regards

    Will Haylock

    adv7611ebz_b_rec.pdf
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