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TCAN1145-Q1: Is there any GPIO for shutoff CAN communication?

xw Duan
Intellectual 640 points
Part Number: TCAN1145-Q1


hi TI experts,

Is there any GPIO for shutoff CAN communication in TCAN1145? such as TCAN1143, EN pin can be used for shutoff CAN communication by changing its state diagram.

BR

xiaowei

  • 0
    TI__Guru 74322 points

    Xiaowei,

    Mode transition occurs through SPI communication on the TCAN1145-Q1, there isn't any direct way through pins to force the device into a state where CAN communication is disabled. An undervoltage event on VCC can force the device into Sleep mode (or Failsafe if that is configured), but I would not recommend this as a way to disable your CAN bus.

    Regards,

    Eric Hackett

  • 0 in reply to Eric Hackett
    Intellectual 640 points

    hi eric,

    Thanks for your answer.

    From state diagram of TCAN1145, there are three ways(UV(vcc), UV(vio),TSD) for transmitting to Failsafe state from any others.

    Why ‘undervoltage event on VCC’ is not recommneded? how about 'undervoltage event on VIO'? 

    BR

    xiaowei

  • +1 in reply to xw Duan
    TI__Guru 74322 points

    Xiaowei,

    It's not recommended because these are typically seen as fault conditions, and it's recommended to transition to the desired state (sleep mode) and then remove power. Not remove power to transition to these states intentionally. UVIO and UVCC are ways to force the device into sleep or failsafe mode, it's just not recommended to remove a power supply during normal operation to do so. That being said, if the customer can guarantee that the device is not performing any needed operations when they need to stop communicating and thus remove power, then I suppose this is okay.

    Regards,

    Eric Hackett

  • 0 in reply to Eric Hackett
    Intellectual 640 points

    hi Eric,

    Thanks for your reply.

    In our safety concept, if there are some critical errors, CAN shall be shutoff independently by IO signal.So VCC/VIO can be used for it.

    BR

    xiaowei

  • +1 in reply to xw Duan
    TI__Guru 74322 points

    Xiaowei,

    Understood, please let us know if you have any other questions.

    Regards,

    Eric Hackett