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About CANH and CANL on CAN driver

Kevin Weng
Prodigy 60 points
Other Parts Discussed in Thread: SN65HVD230

Dear All,

I try to use CAN driver "SN65HVD230DR " for my application.

if I connect  pin canH to canL and pin canL to canH in some ic,

will it  damage all/some CAN transceivers in this bus ?

if it will happen, does it possible to prevent this fault in circuit ?

Thank you!

  • 0
    TI__Genius 14015 points

    Hi Kevin,

    This shouldn't damage any of the transceivers, the SN65HVD230 has a 250mA short-circuit current limit. It might get hot from that current, but the high current won't do any damage directly. If the part got hot enough it may go into thermal shutdown, and the bus pins will go high impedance until the temperature drops back down. During this time, the D and R pins assume a logic high state.

    That being said, communication with the reversed polarity IC will not be possible. It will interpret both recessive and dominant bus lines as <0.5V differentially, which means it will always be seeing a logic high. Additionally, any bits that it sends onto the bus will be interpreted by the other transceivers as logic high's as well. 

    Let me know if this answers your question. Thanks,

    Jason Blackman

  • 0 in reply to Jason Blackman
    Prodigy 60 points

    Hi, Jason

    Thank you for your reply and those info. is useful for me.

    I think one of the mistake on first time I use CAN transceiver is

    I connected this VCC of IC with 5V. I think it may damage the IC.

    ps: sorry for I reply late.