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Original question:

TCAN1043A-Q1: The CANH / CANL differential signal trace impedance control

TCAN1043A-Q1: about CAN H and CAN L trace layout guide

Lawrence He
Genius 3115 points
Part Number: TCAN1043A-Q1

Hi, Support Team

We saw the E2E link.

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1175879/tcan1043a-q1-the-canh-canl-differential-signal-trace-impedance-control

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The CAN H and CAN L layoutTrace Width Calculator as below:

calculator result:

Thickness is 1.85mil and Required Trace Width (W) is 4.15 mil

if we cannot match a 120-ohm impedance, maybe 122 to 125-ohm have any concern? 

if any suggestion, Please advisem me.

Thanks,

Best regards,

Lawrence

  • 0
    TI__Guru 53575 points

    Hi Lawrence,

    The linked post discusses why it is not critical to impedance match the CAN traces due to the relatively slow speeds used by CAN and the small proportion of the signal length that is the signal trace. This means it is quite acceptable to have CAN traces that don't have the same 120-ohm impedance as the rest of the signal path. 

    In this case, I don't think there is any concern to having 122-ohm to 125-ohm trace impedance.

    Let me know if you have any more questions. 

    Regards,
    Eric Schott