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TCAN1145-Q1: power consumption in sleep mode

Alfie Cheng
Expert 3550 points
Part Number: TCAN1145-Q1

Tool/software:

Hi team, 

could you help with below question?

  1. in sleep mode, when there is no message on CAN bus, the device quiescent current is  65uA, but when there have message on CAN bus, the quiescent current will rise to 470uA, is it normal?
  2. if the fail-safe mode is disable, what is the any risk need to take into consideration?

  • 0
    TI__Mastermind 27660 points

    Hi Alfie,

    1. This is normal, that extra current is caused by WUF receiver, which means the transceiver need to consume more current to monitor the WUF. This WUF receiver will only be on when the bus has activity.

    2. Fail-safe mode provides a window of time to clear the faults and receive a wake event when the fault like UVCC, UVIO, TSD happen. The INH is still turned on in this mode, thus in a failure situation, the transceiver will maintain microcontroller functionality for as long as possible to provide a monitoring and software-driven fallback operation. If fail-safe mode is disabled, the transceiver may enter sleep mode if there's fault condition, which will turn INH off then shut down the voltage regulator of microcontroller.

    Regards,

    Sean