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DP83822I: Ethernet XCVR is intermittent.

GLENN SIVILA
Prodigy 10 points
Part Number: DP83822I

Tool/software:

We're having intermittent issue with the Ethernet XCVR. Applied 25 MHZ oscillator on pin 23. The PN of the Ethernet XCVR is DP83822IRHBT.

Pins 2 (TX_CLK), 23 (XI) and 25 (RX_CLK) probed with an oscilloscope. In the failed state no clocks were observed on pins 2 and 25.  The oscillator input on pin 23 was present and measured at 25 MHz’s. When the unit was probed in the working state pins 2 (TX_CLK), 23 (XI) and 25 (RX_CLK ) displayed good clocks.  At this point we believe the issue is within the TI Ethernet transceiver. 

  • 0
    TI__Mastermind 21162 points

    Hi Glenn,

    How often does the PHY failed state occur?

    If there is no output clock when valid input clock is present, I suspect the PHY is either not powered or damaged.

    To confirm if it is powered, please probe voltage across RBIAS resistor (should equal ~1V)

    To confirm if it is damaged, please perform an ABA swap of the PHY with another board.

    Thank you,

    Evan