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Protecting evaluation card from transients and electromagnetic effects

Tahir Qureshi
Prodigy 120 points

How to avoid current transients and electromagnetic effects on TMDXRM48HDK?

I am trying the evaluation card in an environment where there are chances of transients at many places.

I have already broken one card and don't want it to happen again. Therefore, I would appreciate if I can instructions on ground and other protection which should be applied on the card.

  • 0
    TI__Expert 4610 points

    Hi,

    Thanks for using e2e forum. I have forwarded your query to our experts. They should get back to you.

    Regards,

    Praveen

     

  • 0 in reply to Praveen Kumar Ravichandran
    TI__Guru**** 197306 points

    Hello,

    The HDK is sensitive to static discharges. Use a grouding strap tp prevent damaging the board.

    Regards,

    QJ

  • 0 in reply to QJ Wang
    Prodigy 120 points

    In that case I have three more questions.

    1. Are TP4, 5, 6 and 7 need to be grounded?

    2. Do I need to ground all the four pins?

    3. What about CAN ground? Can I survive without grounding it?

    4. Is there a need for adding a resistor between CAN-H / CAN-L and CAN-Gnd ?

  • 0 in reply to Tahir Qureshi
    TI__Guru**** 197306 points

    Hi Tahir,

    1. TP4/5/6/7 are connected to GND on HDK

    2. Which 4 pins?

    3. It is not required to provide a common ground between nodes. but I recommend to use 1 common ground between nodes, make sure this happens at one place only to avoid ground loops. If no common groud used, it is possible to have ground offsets between nodes. That is, each node may observe different single-ended bus voltages while maintaining the same differential voltage. Operating a CAN system with large ground offsets can lead to increased electromagnetic emissions.

    4. Bus termination is used to minimize signal reflection on the bus. CAN protocol requires that the CAN bus have a nominal impedance of 120ohms. Therefore, the typical terminating resistor value for each end of the bus is 120ohms. You can use either standard termination (on USB stick) or split termination (used on HDK).

    Regards,

    QJ