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SN65HVD1050: the routing of SN65HVD1050 CAN communications

sherry yang
Prodigy 240 points
Part Number: SN65HVD1050

What are the requirements for the routing of SN65HVD1050 CAN communications?

Whether need to take the differential line? What is the wire diameter of the line? How much pitch between CANH and CANL is appropriate?

How many ohms of impedance? (communication matching resistance is 60 ohms)

  • 0
    TI__Guru 62920 points

    Hi Sherry,

    Yes, routing CANH/CANL as differential signals helps to maintain the EMI benefits of balanced signaling and also helps when matching the lengths of these traces.  The lines should be routed such that they have a controlled characteristic impedance, which is typically set to 120 Ohms (differential) in order to match the typical characteristic impedance of the twisted pair cabling using.  The trace impedance will be a function of the trace widths/spacing as well as the PCB stack-up information (such as the dielectric material used and the spacing between layers), and most PCB CAD tools will help to calculate or tune this impedance.  If your CAD tool does not feature impedance calculations, you might want to search for a free online tool for this calculation.

    Regards,
    Max