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TCAN1044-Q1: What is the power strategy of TCAN1044 under sleep mode?

Jeff Yun
Expert 4175 points
Part Number: TCAN1044-Q1

Hi, Team

Hope you are doing well!

My customer has some questions when they use our TCAN1044-Q1.

1) What is the power strategy of TCAN1044-Q1 under sleep? If it is necessary to be able to wake up via the bus, then in terms of power supply, is it required that Vio has power and VCC can be powered off? Or does it require Vcc to be powered, and Vio can be powered off?
2) Regardless of whether VCC or Vio is required to be powered, in order to reduce the quiescent current, is it necessary for STB to be active in Standby mode?

Thanks & Best Regards

Jeff

  • 0
    TI__Guru 53555 points

    Hi Jeff,

    When TCAN1044 is in Standby mode with the STB pin driven high, the CAN driver and high-speed receiver are disabled and the device consumes much less power. In this state, the low power wake-up receiver remains active to monitor the CAN bus for a wake up pattern (WUP). The low power receiver is supplied by the Vio pin so the 5V Vcc rail may be disabled for this Sleep state (non-V devices must keep Vcc active to power the low power receiver). 

    When the transceiver receives a WUP while in Standby mode, it will drive the RXD signal low (one of the reasons that Vio is required) to indicate the wake request to the MCU. The MCU may then re-enable the Vcc supply if applicable and drive the STB pin low to place the transceiver into Normal mode so that the node may interface with the CAN bus. 

    Let me know if this is clear and if you have any more questions.

    Regards, 
    Eric Schott