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TCAN1043-Q1: How to test nfault pin in can bus failures

Jimmy Huang22
Expert 1470 points
Part Number: TCAN1043-Q1

HI ti team,

1, Could you pls help us check how to test the nfault pin in can bus failures?

I test in normal mode,short the CANH to GND,the nfault pin also is high no changed to low

2, in Standy mode, if use can bus to wake up,the nfault pin also is high no changed. Can I wake up the MCU with Nfault pin when Can bus signals?

  • 0
    TI__Guru 53515 points

    Hi Jimmy,

    1. The CAN Bus Failure Fault Flag only detects a bus fault while transmitting a dominant signal on the CAN bus. One of the fault conditions must persist for four consecutive recessive to dominant transitions for nFAULT to indicate the condition.To test this, Transmit a square wave while applying the fault and observe the nFAULT pin go low after the fourth transition.

    2. The nFAULT pin will identify the source of a wake up request only after returning to normal mode. During stanby mode, a wake up request is indeicated by the RXD terminal being low. Use this pin to wake the MCU and then use nFAULT to identify if the source of the wake up command was on the WAKE pin or the CAN bus.

    Let me know if you have any more questions,
    Regards,
    Eric