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TCAN334: Compatibility to automotive CAN transceiver

Markus Krenn11
Prodigy 100 points
Part Number: TCAN334
Other Parts Discussed in Thread: TCAN332, TCAN330, TCAN337

Hello,

I'm designing an autmotive compatible CAN Interface but the General automotive CAN Transceiver in SOIC8 are to big for this space related application.
Is it possible to use instead the TCAN334? Does this part also fullfills the requirements? I'm not completely sure about it because of:
Common Mode Range
Bus Fault voltage
Vout recessive voltage difference

Thanks in advance

  • 0
    TI__Guru 65792 points
    Markus,

    TI's 3.3V CAN transceivers are compatible with the Automotive CAN standard, but not fully compliant. Does the 3.3V transceiver need to work with a 5V transceiver on the bus as well? That will determine if you should go with the TCAN334 or the SN65HVD23x series.

    Regards,
  • 0 in reply to Eric Hackett
    Prodigy 90 points
    Hi Eric,

    Yes I think so, so it's definitly an automotive application.
    Do you have any automotive compatible CAN transceiver with 3V Supply and much smaller than SOIC8?

    BR
    Markus
  • 0 in reply to Markus K.
    TI__Guru 65792 points

    Markus,

    EDIT: I was incorrect, the TCAN330, TCAN332, TCAN334, and TCAN337 devices come in the SOT-23 package, which is smaller than the SOIC8 package.

    Regards,

  • 0 in reply to Eric Hackett
    Prodigy 100 points
    Hi Eric,

    Ok, so they are compatible but not compliant, correct? So if I want to be compliant to automotive systems, I have to use a 5V CAN transceiver?
    It should be as small as possible. So my idea at the moment is, to use a dual voltage regulator for 5V and 3V and use the TCAN1042 with VSON8 with VIO option, so that the 3V microcontroller can be connected.
    5V supply is not possible for the microcontroller.

    BR
    Markus
  • 0 in reply to Markus Krenn11
    TI__Guru 65792 points
    Markus,

    That is correct, the 3.3V CAN transceivers are not fully compliant with ISO 11898 Automotive CAN standard due to specific voltage level requirements for bus signals. There are 3.3V transceivers in a smaller package though.

    That approach would work, you'd have to use the TCAN1042V device so that the logic levels of the device (TXD, RXD, STB) would all work at 3.3V logic. You can apply the 3.3V supply for the MCU to the VIO pin for this to work, but yes, a 5V supply will still be needed to power the VCC of the CAN transceiver.

    Regards,
  • 0 in reply to Eric Hackett
    Prodigy 100 points

    Hi Eric,

    So in the datasheet of TCAN330, TCAN332, TCAN334, and TCAN337 is mentioned  that they fullfill ISO 11898-2.
    In TCAN1042 also the ISO 11898-5 Physical Layer Standard is mentioned so thats why the TCAN3x are not fully compliant, is that correct?

    Thanks in advance,

    BR

    Markus

  • 0 in reply to Markus Krenn11
    TI__Guru 65792 points

    Markus,

    The TCAN1042 is fully compliant to the ISO 11898-2 and -5 standards, you are correct. The difference for the -5 standard is the low power mode specification is included. Not all of the TCAN33x devices have a low power mode.

    In the TCAN33x series datsheets, it says "compatible", not compliant. Meaning these transceivers are compatible with transceivers that are compliant with the ISO11898-2 standard, but they don't comply themselves.

    Regards,

  • 0 in reply to Eric Hackett
    Prodigy 100 points

    Hi Eric,

    So I would use the TCAN1042 with dual supply, I think thats the way to solve my issue.

    Thank you very much for the help.

    BR

    Markus