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TCAN1043-Q1: the CAN bus shorted to GND how to recover normal mode

Lawrence He
Genius 3115 points
Part Number: TCAN1043-Q1
Other Parts Discussed in Thread: TCAN1043

Hi, Support Team

the CAN bus shorted to GND how to recover normal mode?

The CAN bus shorted to GND should still allow the device to go into Standby mode. its mean if i see nFault is Low and then we should set EN/nSTB go into Standby. and then wait nFault to High. it will go to normal mode?

is correct?

if any suggestion, Please advsie me.

Thanks,

Best regards,

Lawrence

  • 0
    TI__Guru 53575 points

    Hi Lawrence. 

    The fault detection circuit in the TCAN1043 is only able to detect the presence or absence of a bus fault while it is driving the CAN bus in normal mode. It does this by measuring the dominant current of the CAN driver when TXD is low. In order for the system to determine if the bus fault has been resolved, it will have to attempt to transmit a frame while the transceiver is in normal mode and see if the nFAULT pin asserts low or remains high. 

    In the case where a bus fault is detected, it may not be required for the transceiver to move to standby mode. This is simply additional information that the system can use to determine the appropriate action. For instance, if CAN communicate can no longer be sent or received correctly and the TCAN1043 reports a bus fault, it may be desired that the system moves to a low low power state.The system may then auto wake every 1 minute (for example) to drive the CAN bus to see if the fault has been resolved. 

    Note that whenever the TCAN1043 leaves normal mode and then returns to normal mode, transitions on TXD will be required to determine if a bus fault is still present. 

    Let me know if you have any more questions. 

    Regards, 
    Eric Schott