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Original question:

TCAN1043-Q1: The UV protect of TCAN1043

TCAN1043-Q1: The TC DTO of TCAN1043

Yao Zeng
Prodigy 100 points
Part Number: TCAN1043-Q1

Hi,TI partener:   

Why is there a TXD DTO? How to operate if the CAN node wants to transmit multiple consecutive dominants?
  • 0
    Guru 287370 points

    There is no CAN node that would want to do this. This is explained in the note following the figure:

    The CAN protocol allows a maximum of eleven successive dominant bits (on TXD) for the worst case, where five successive dominant bits are followed immediately by an error frame.

  • 0 in reply to Clemens Ladisch
    Prodigy 100 points

    where five successive dominant bits are followed immediately by an error frame

    -----------------------------------

    What's the meaning of this? Does it means that if there is a error frame,the CAN BUS will transfer ive successive dominant？

  • 0 in reply to Yao Zeng
    Guru 287370 points

    A normal transmission cannot have more than five equal bits. An error is indicated by six equal bits.

  • 0
    TI__Mastermind 19930 points

    Hi Yao,

    Clemens is correct. The purpose of the dominant time out is to make sure there are no errors on your bus. If you are running at a rate above 9.2 kbps then if all of a sudden your bus is held dominant indefinitely the other CAN transceivers can no longer communicate on the bus. This could lead to some catastrophic safety problems in a vehicle or other systems. That is why dominant time out exists in the case that a device stops working at least the other CAN transceivers can continue to communicate.

    Regards,

    Sean