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DP83822IF: DP83822IFRHBR

Jeff Cohen
Prodigy 150 points
Part Number: DP83822IF

Hello,

I am trying to get a design that has a DP8322IFRHBR to pass ESD. I would like to isolate the drive of the LED's through a buffer such as an LVC1G08, but the LED's are also used for bootstraps. Further complicating things is the fact that the DP83822IF can be configured for either Fiber or copper modes based on the bootstrap resistors placed on the two LED's.  How can I place a buffer on teh LED's in a way that it will not mess up the device booting? When the unit is hit with ESD, the PHY locks up and cannot recover unless the unit is power cycled. Can the device be booted by software? This would make things much easier?

Thank you for your help and support.

Jeffrey Cohen

  • 0
    TI__Expert 7040 points

    Hi Jeffrey,

    Can you describe how you are testing the ESD performance of the PHY? Are you zapping the LED pins directly?

    Which mode are you targeting to boot into? The device can be configured into either Copper (default) or Fiber (Register 0x000A) mode through register configuration. 

    Regards,
    Justin 

  • 0
    Prodigy 150 points

    Hello Justin,

    The ESD issue is probably related to the fact that the Earth ground is running through a 40mil wide trace. I am having the PCB redesigned to make the Earth ground a copper fill. I am also buffering the LED's and control signal. I will buffer LED_1 and LED_ with a gate. From the data sheet it seems that as long as LED_0 is pulled up on power up, the LED will be active low, which is what I want. 

    Jeff