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DP83822EVM: Compliance test with DP83822EVM

Hirotaka Matsumoto
Guru 27585 points
Part Number: DP83822EVM

Hi all

Would you mind if we ask DP83822EVM?

If you have some infromation of Compliance test with DP83822EVM, could you let us know?
In case of full range temparature -40C to 125C, is there no problem for compliance test.
As the background of our question, our customer told us that link loss failure occurs in case of 5C.
Of course, we break down the issue into parts in order to find the real cause.
That's why, we ask you whether you have some experience in case of 5C or less than 5C.

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Mastermind 19780 points
    Hi Hirotaka-san,

    We do not have an issue with DP83822 at low temperatures, we characterize the device at all temps from -40C to 125C.

    Can you describe what occurs besides link loss? I would like to know the conditions. Is the link created at 25C, then the temperature brought down and it is lost at 5C? Does this happen for all starting temperatures? Does the link come back after a period of time? Can you share a schematic capture of the DP83822?

    Best Regards,
  • 0 in reply to Rob Rodrigues
    Guru 27585 points

    Rob san

    Thank you so much for your reply!

    Can you describe what occurs besides link loss?
    ->Our customer confirmed that it causes of RX_ER(receiving error).They confirmed that RX_ER count(0x0015 Receive Error Count Register (RECR)) increases to 0xff.

     Is the link created at 25C, then the temperature brought down and it is lost at 5C?
    ->Now, we confirm it.

    Does this happen for all starting temperatures?
    ->We heaed that this happens with less than 5C.

    Does the link come back after a period of time?
    ->Now, we confirm it.

    Can you share a schematic capture of the DP83822?
    ->We confirm to our customer that it is possible or impossible.

    We will feed back you.

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    Guru 27585 points

    Hi all

    The problem was solved.
    The cause was the noise at clock line.
    Clock is supplied by CPU.
    On our customer's board, the pattern layout which is between PHY and CPU was too long.

    Thank you for your cooperation always!

    Kind regards,

    Hirotaka Matsumoto