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SN65HVD231: Question for 3.3VCC device connect to 5VCC device

GaryC
Intellectual 2615 points
Part Number: SN65HVD231

We use SN65HVD231DR with VCC 3.3V. We want to connect other SN65HVD231DR with VCC 5V. May I know whether have any concern for the CAN_H, CAN_L and GND?

If our board has several of the SN65HVD231DR, may I connect all of devices with the same GND?

BR, Gary

  • 0
    Guru 243910 points

    The bus voltage is independent from the logic voltage.

    All CAN transceivers must use the same ground.

  • 0
    TI__Mastermind 48195 points

    Thanks Clemens!

    Hi Gary, 

    All of our 3.3V supplied CAN transceivers are designed to be compatible with other 5V supplied transceivers on the same CAN bus. See datasheet section 11.3.1.3 for more information on this. 

    Please note that SN65HVD231 needs to be supplied with 3.3V to its Vcc pin. This device is not capable of operating with 5V supplied to this pin. If a 5V supply is used, a 5V supplied transceiver such an TCAN1044A must be used. These transceivers can operate on the same CAN bus (connected CANH and CANL signals) because of the compatibility with the ISO 11898-2 CAN standard. 

    It is recommended to have all communicating nodes connected to the same GND potential. However, CAN transceivers often support a wide common mode range (-2V to +7V for SN65HVD231) in order to tolerate GND potential differences between nodes.

    Let me know if you have any more questions.

    Regards,
    Eric Schott