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TCAN1042G-Q1: TCAN1042 layout

Kygo Cheng
Expert 6830 points
Part Number: TCAN1042G-Q1
Other Parts Discussed in Thread: TCAN4550-Q1

Hi Team,

There is a good new that DIN TCAN1042

If the CANH and CANL trace are not the same exact length what will it impact? Will it cause any significant impxct?

TCAN1042: CANL = 1495mils, CANH= 1774 mils

  • 0
    TI__Guru 74322 points

    Kygo,

    Similar to the TCAN4550-Q1 thread on this same topic, while the difference between CANH and CANL isn't too significant, I would still recommend the customer try to get the difference between the two below 100 mils. The effect this can have is timing asymmetry between CANH and CANL, which would ultimately degrade the receiver interpretation of each bit, and may cause worse emissions due to any mistiming. 

    What will the data rate be for this application?

    Regards,

    Eric Hackett

  • 0 in reply to Eric Hackett
    TI__Expert 6830 points

    Hi Eric,

    In order to meet the difference of the trace lenght below 100mils. 

    Could you help confirm if the layout of CANFD_L and CANFD_H in this way? Shown as below red line.

  • 0 in reply to Kygo Cheng
    TI__Guru 53575 points

    Hi Kygo,

    Yes, the routing of the CAN traces like this is no problem. Are you able to share the target data rate for this system? The slower this is, the less critical the length difference will be. 

    I will note that with the CAN traces routed above the FS-POW lines, there's risk of cross talk between these signals (power?) lines. This should be avoided if possible, but should not be a large issue if the signals are low-speed (low current power traces) or the board is thick enough to provide significant shielding. 

    Regards,
    Eric Schott