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Original question:

SN55HVD251 and SN65HVD231 -- ISO11898

SN65HVD231: ISO compliant test of SN65HVD231D & SN65HVD231Q-Q1

Ben Kuo
Expert 6715 points
Part Number: SN65HVD231

Dear team,

May I double confirm below item with you? Thanks.

Does our SN65HVD231D & SN65HVD231Q-Q1 can both compatible with ISO11898(1-5) and ISO16845?

Ben

  • 0
    TI__Mastermind 22965 points

    Hi Ben,

    I have looped in Eric  to help follow-up with your question. 

  • 0 in reply to Ravi Singh
    TI__Expert 6715 points

    Hi Ravi and Eric,

    Did we have update? thanks.

    Ben

  • 0 in reply to Ben Kuo
    TI__Guru 60262 points

    Ben,

    By definition, 3.3V CAN transceivers aren't fully compliant to ISO11898-2 because of the Vsym parameter and the single-ended CANH and CANL voltage definitions. They are compatible with 5V CAN transceivers that adhere to the ISO11898-2 specification. This is the same for ISO16845, the 3.3V CAN transceivers are compatible, but not fully compliant.

    Please let me know if you have any other questions.

    Regards,

  • 0 in reply to Eric Hackett
    TI__Expert 6715 points

    Hi Eric,

    I would like to double confirm with you.

    Does 5V CAN means 5V supply voltage? or Voltage at any bus terminal(VIC)?

    An other question is, 

    We have show *Compatible With ISO 11898-2 Standard* in SN65HVD23x datasheet, but it's fully compliance in 5V CAN.

    Did you have suitable solution can share with us? ( 3.3V CAN Transceivers/ Fully Compatible With ISO 11898-2 Standard)

    thanks.

    Ben

  • 0 in reply to Ben Kuo
    TI__Guru 60262 points

    Ben,

    5V CAN does indeed mean 5V supply (VCC) voltage and thus 5V CAN bus biasing. 3.3V CAN means the VCC is 3.3V and thus the CAN bus is biased to 3.3V.

    Because of some parameters in the 5V CAN ISO 11898 standard, and because the 3.3V CANH and CANL voltages are asymmetrical to work with 5V CAN transceivers, it's not possible for the 3.3V CAN to be fully compliant with the ISO11898-2 standard. So there aren't any 3.3V transceivers that are fully compliant with ISO11898-2, but they will work with 5V transceivers that are fully compliant with ISO11898-2.

    Regards,