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TCAN3414: How to deal with CAN GND

Robert Jan Bout
Prodigy 171 points
Part Number: TCAN3414

Tool/software:

Hi, I have a simple question. I use the TCAN3414 in my system. Which is a 3v3 CAN driver. Now, we need (or do we?) CAN ground. Is this compatible with 5V drivers? If I'm right, the idle bus voltage of 3v3 and 5v CAN drivers differ. With the 5V ones being 2.5V and the 3v3 ones being 1.65v. Am I right that this is going to possibly cause problems or add extra current flow? Nothing seems to be written about this topic.

  • +1
    TI__Mastermind 26806 points

    Robert,

    The 3.3V CAN transceivers are capable of idling at either 2.5V or <2V depending on bus conditions. This is what allows for them to be interoperable.

    Regarding your GND question, it is not a requirement for TCAN3414 to have a different GND than other 5V CAN transceivers on the bus. If the other transceivers share the same GND, then it is fully acceptable to share the same GND between 5V and 3.3V CAN transceivers. The devices are intended to be fully interoperable with existing 5V CAN networks.

    In a heterogeneous setting (i.e. mixed 3.3V CAN and 5V CAN), you might see the common-mode shift around depending on which nodes are communicating/transmitting at any given time. This is an expected phenomenon.

    Best,

    Danny

  • 0 in reply to Danny Bacic
    Prodigy 171 points

    Thanks for your clear response. Now I can confidently use this driver.