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SN65HVD23: Can this part replace a CAN transceiver bridge?

Lauren Mayfield
Expert 7915 points
Part Number: SN65HVD23
Other Parts Discussed in Thread: TIDA-01487

Hi team,

My customer is is currently using a CAN transceiver part that internally creates a bridge between two CAN bus branches. They are wondering if there is a way to replace this part with two SN65HVD23 transceivers with appropriate connection on the microprocessor CAN peripheral side (RX/TX lines)?

Would this work? Do we have any app notes that can give them some guidance on this?

Thanks!
Lauren

  • 0
    Guru 317060 points

    TIDA-01487 is an isolated CAN bridge; just leave out the isolator.

    Also see this earlier question.

  • 0 in reply to Clemens Ladisch
    TI__Guru 53555 points

    Thanks Clemens!

    Hi Lauren,

    Let me know if this sounds like what you're looking for and if you have any more questions.

    Regards,
    Eric Schott

  • 0 in reply to Eric Schott1
    TI__Expert 7915 points

    Hi Eric,

    One more question-
    If they take that arbitration block, it looks like it will also function if they use it as a branch connection like so:

     

    Basically they have preferential connection to bus 1 there, and bus 2 is a secondary connected bus. Does that seem right? It looks like it would work electrically.

    Thanks!
    Lauren

  • 0 in reply to Lauren Mayfield
    TI__Guru 53555 points

    Hi Lauren,

    It's certainly possible to include an MCU here, but it may complicate things a bit when it needs to drive the CAN bus. In the configuration shown, there may be contention if the MCU and Bus 2 try to drive the TX1 signal at the same time. To avoid this, these two inputs could be ANDed together (allow 0s to dominante). 

    Another method would be to add the MCU to Bus 1 bia another CAN transceiver. This could be simplified by swapping CAN 1 with a dual channel device like TCAN1046. This would simply tie both CANHs and CANLs together and route the digital signals of each channel to the MCU and arbitration logic separately. 

    Let me know if either of these options sound good or if there's something else you would like to accomplish here.

    Regards,
    Eric Schott