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TCAN1042-Q1: the rising edge time

Amelie Zheng
Genius 10865 points
Part Number: TCAN1042-Q1
Other Parts Discussed in Thread: SN65HVD251-Q1,

Hi Team,

During the test, the rising edge time is about 20~50ns (CAN rate: 500Kbit/s). CAR OEM requirement is 200-500ns.

could we change the CAN rising edge time?

Why the rising time is faster than datasheet so much?

  • 0
    Guru 317390 points

    The rise/fall times are specified as tR and tF.

    Transceivers like the SN65HVD251-Q1 allow to adjust the rise/fall time with the Rs pin.

  • 0 in reply to Clemens Ladisch
    TI__Guru 74292 points

    Amelie,

    As Clemens said, the rising time is represented by tR and tF in the datasheet. Only our older devices have slope control on the CAN bus pins. 200-500ns is pretty slow relative to typical CAN data rates, are you sure this is the requirement for the rise and fall time?

    Is the CAR OEM requirement coming from EMC limits? Typically that's why rise time is adjusted. If the customer is uncomfortable with fast rise times, we can provide EMC certification reports to show that TCAN1042-Q1 still meets EMC requirements even with faster rise times on the CAN bus.

    Regards,

    Eric Hackett