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DP83848-EP: DP83848 Application Question in High Temperature

Part Number: DP83848-EP

Hi Team,

 

My customer finds a DP83840 issue under high-temperature( air temp is about 70 degC). Could you please help me with this? Thanks.

Issue Description:

The board is put under the temperature higher than 70degC. The PHY link is built up under the normal temperature. They increased the temperature to 70 degC and the link works well. They disconnect the PHY connector to the board at 70degC and re-connect the connector, but found that the 100base-TX signal deteriorated. The device works at 100MSPS and MDI.

Test Results:

                Note that the signals shown as below are tested after the signal transmitted over a transformer. And only the DP83840 is heated.

  1. When the air temperature is normal or 70degC, and without disconnect-reconnect action, the signal is good (Eye pattern and time-domain signal).

  2. When the air temperature is higher than 70degC, disconnect and reconnect PHY interface, the signal deteriorated (Eye pattern and time-domain signal).

Test Results:

  1. Did you find the same issue on your bench?
  2. Is there any other steps we can take to debug this issue?