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ISO1042DWEVM: ISO1042 stops board casting after noisy event and never comes back online

john kelly
Prodigy 100 points
Part Number: ISO1042DWEVM
Other Parts Discussed in Thread: TMS320F28379D, ISO1042,

Hello, we are using a the iso1042bdwvr in our High voltage controller board for CAN communications, 250kps. During noisy events, i.e. HV inverters turning on, the controller stops board casting and does not come back online. From the CAN scope plots it appears that the device does not recover from a Tx DTO (will try to send plots). Is there any reason the device would stop board casting completely? Note thermal and power ok. We are using a TMS320F28379D. Aside, should I use a pullup on the Tx pin?

Thank John  

  • +1
    TI__Expert 8030 points

    Hi John,

    Thanks for reaching out. I am assuming when you use the term " board casting" you really mean "broadcasting". If this is not the case, please let me know.

    john kelly said:
    During noisy events, i.e. HV inverters turning on, the controller stops board casting and does not come back online.

    In this sentence, does the term "controller" refer to the ISO1042 transceiver? Does the transceiver stop working whenever the HV inverter turns on?

    john kelly said:
    From the CAN scope plots it appears that the device does not recover from a Tx DTO (will try to send plots)

    What exactly do you mean when you say that the device does not recover from a Tx DTO? From what you have said, I am assuming that the device is getting stuck in a dominant state and is not being driven recessive after the defined DTO period. Could you please provide oscilloscope screenshots that show this behavior?

    john kelly said:
    Is there any reason the device would stop board casting completely?

    No, this behavior is not expected with this device.

    john kelly said:
    Aside, should I use a pullup on the Tx pin?

    You can use a pullup resistor on the Tx pin, but it is not required for the device to function correctly.

    Could you please provide us with a schematic that has a higher resolution than the one you provided in your initial response? If it is easier, you can also provide the schematic as a PDF file.

    Additionally, are you testing this device on the ISO1042DWEVM, or are you testing this device on your own board?

    Regards,

    Kenneth