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TCAN4550-Q1: CAN Stuck Dominant

Part Number: TCAN4550-Q1

Hello team,

I have an question from customer on CAN Stuck Dominant in TCAN4550-Q1:

Could you tell us how to cause CAN Stuck Dominant fault? We want to confirm the behavior of CAN Stuck Dominant(CANDOM=1).

We tried following methods but didn't work:

- Confirmed CANDOM=0 when CANH/CANL are connect to GND

- Confirmed CANDOM=0 when CANL is connect to GND

Thank you,

Muwei Zheng

  • Muwei,

    If both CANH and CANL are connected to GND, this will be interpreted as recessive because there is no differential between CANH and CANL. If CANL is pulled to GND, there is still a chance that CANH will get pulled down with it and still not exceed the differential threshold for a dominant signal.

    Increasing the differential voltage between CANH to CANL to greater than 0.9V will create the dominant case, and then the controller should be able to interpret this as CAN bus stuck dominant.

    Regards,

    Eric Hackett