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CAN FD Questions

Akash Patel
Expert 6245 points


Hi Team,

A few questions that I had about about our CAN products:

  • Would our CAN2.0b microcontrollers (the TIVA MCUs, TM4C12x) be able to drive a CAN FD transceiver at CAN FD rates?
  • How does CAN FD transceiver overcome cable length limitations?

Thank you,

Akash Patel

  • 0
    TI__Guru** 103215 points
    Hello Akash,

    CAN FD allows for both higher speed and flexible data rates as an upgrade to current CAN networks. As you may know, a CAN packet is comprised of several fields including an arbitration field, data field, acknowledge bit, etc. The CAN FD protocol allows for higher data rates in the data field and lower speeds during arbitration. We do have CAN transceivers that are capable of operating with the CAN FD protocol, however at this time we do not have any micro controllers that can drive CAN FD packets. The protocol may be supported by our MCUs in the future.

    As for bus length, careful system design can allow for longer bus lengths. Common elements that improve performance are proper termination, appropriate cable materials, and reduction of the number of nodes on the bus.

    Best Regards,
    Casey McCrea
  • 0 in reply to Casey McCrea
    Prodigy 60 points
    Hello,

    Regarding CAN-FD I have a few questions, too.

    - Is there any roadmap, when the protocol will be supported my your MCUs?
    - Are the Tiva-MCUs CAN-FD tolerant or will it create errors? Especially for automotive use-cases this would be interesting.

    Best Regards,
    Fabian Sedlmeier
  • 0 in reply to Fabian Sedlmeier
    TI__Guru 62920 points
    Hi Fabian,

    I think the MCU teams would probably be able to give you a more accurate answer on this. This forum is primarily intended to support the analog side of things (like discrete CAN transceivers), and since the MCUs come out of a different division at TI we may not have the most up-to-date understanding of their future plans. You could find the relevant forum here, though: e2e.ti.com/.../.

    Best regards,
    Max