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SN65HVD230 5 V compatibility

Jeremy Dwyer25
Prodigy 30 points


Hi all,


I can see in the datasheet that this chip is compatible with 5 V CAN bus devices.  However, I have concern that mixing the two will cause an excessive current demand on the 5 V nodes if many 3.3 V devices using this chip are in arbitration with a 5 V device.  We will have five 5 V devices and five 3.3 V devices on the same bus.


I do not know if I can get specs on the 5 V nodes we are purchasing.  Is this a valid concern, and what steps can I take to address it?


Thanks,

Jeremy

  • 0
    TI__Guru 62920 points
    Hi Jeremy,

    Is your concern that current will flow from the 5-V transceivers to the 3.3-V transceivers on the CANH line when both transceiver types are dominant? If so, that shouldn't occur - the output driver for the HVD230 uses series diodes in order to prevent reverse current flow.

    Section 4 of the following application note might be helpful in giving you an idea of how supply currents are shared between 3.3-V and 5-V transceivers operating on a common network:

    www.ti.com/.../slla337.pdf

    I hope this helps; please let me know if you have any other questions.

    Best regards,
    Max