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DP83822I: Inquiry about etherCAT design.

DEUGKI SHIN
Prodigy 50 points
Part Number: DP83822I

Tool/software:

Hello.

I am currently designing an EtherCAT using the DP83822IH.

I am writing this to seek advice regarding EtherCAT design. To implement the minimum number of pins, I plan to use only 5 pins for the EtherCAT connection (TX +/-, RX +/-, Shield GND) with a separate connector instead of an RJ45.

After using a transformer, I am considering connecting the secondary side, which should originally connect to RJ45 pins 4, 5, 7, and 8, to GND or chassis GND. Would this be acceptable? I would appreciate your advice.

Thank you.

Best,

  • 0
    TI__Mastermind 34225 points

    Hello,

    Essentially, you are asking if you may replace the secondary of the transformer with GND? This would not be recommended as our guidance has been to include Bob-Smith termination.

    Sincerely,

    Gerome

  • 0 in reply to Gerome Cacho
    Prodigy 50 points

    Hello,

    Thank you for your response.

    I plan to use a separate 5-pin connector (TX_P, TX_N, RX_P, RX_N, Chassis GND) instead of a LAN connector as indicated below. Please advise if there are any adjustments or corrections that should be made.

    Thank you.

    Best,

  • 0 in reply to DEUGKI SHIN
    TI__Mastermind 34225 points

    Hello,

    Thank you for providing the diagram. I don't see any issues with this as the secondary of the transformer is connected appropriately. While slightly unconventional as we primarily expect RJ-45 connection, the 5 pin connector should be okay to proceed further. 

    Sincerely,

    Gerome

  • 0 in reply to Gerome Cacho
    Prodigy 50 points

    Hello,
    Thank you for your response.

    Lastly, I am trying to separate the primary-side and secondary-side grounds (GND). I believe that the Bob Smith Termination should be connected to the secondary-side GND, which is the chassis GND. Am I correct?

    Best,