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TCAN1044A-Q1: standby mode

Chuqiang Wen
Expert 5825 points
Part Number: TCAN1044A-Q1

Hi Expert, 

Please help check below question for TCAN1044A-Q1 standby mode. 

We would like to put TCAN1044A into low power mode.

STB will be pulled to high level by SOC first.

However, when SOC is going to low power mode too, STB will be pulled to low level unintendedly by the SOC.

At the same time, VCC(5V) will be switched OFF and only VIO(3.3V) will be supplied.

Questions: 

  • May I know if TCAN1044A will remain in low power mode?
  • Can remote wake up still be supported?

Please kindly let me know if anything not clear.

Regards,

Ethan Wen

  • +1
    TI__Mastermind 26806 points

    Ethan,

    Thanks for posting! I am assuming based upon your question that you are using the TCAN1044AV-Q1 which has VIO.

    When the VCC supply to the device is removed, the device will become undervoltage/unpowered. If VIO is also supplied, then the behavior of the device depends on STB. If STB is high, it will be in Standby mode and capable of receiving bus wake-up (remote wake). However, if STB is also low, then it will not be capable of receiving wake-up, regardless of the level of VCC and/or VIO.

    The STB pin has an internal pull-up that biases the pin to VIO in the event it is left floating. If you mean the pin will be left floating, then this should still bring the STB pin high. However, if you mean that the MCU will strongly drive STB low, then this would prevent a remote wake from being possible. From your description, though, it doesn't seem like this is the case.

    Best,

    Danny