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TCAN1145-Q1: VSUP Current Inquiry

Evan Wang
Expert 6980 points
Part Number: TCAN1145-Q1

Hi Team,

We would like to check the current consumption of TCAN114x-Q1 VSUP pin.

May we know how to define the "Additional current when selective wake is enabled and bus active"?

Like in normal mode(1.5mA) + this current to get total 2.05mA in normal mode?

Kindly help to clarify this point.

We try to calculate the "Total" VSUP current in below 2 state so we need that info.

Could you tell us how to get that total VSUP current value?

Thank you.

  • 0
    TI__Guru 50835 points

    Hi Evan,

    The SW additional current is relevant when SW receiver is active in sleep mode (the bubble you've labeled "1"). This current is not used when the transceiver in sleep mode with only the LP receiver active (bubble "2"). 

    When the TCAN1145 is in sleep mode with idle CAN bus, only the LP receiver is active in order to monitor the bus for a wake up pattern. In this state, the SW receiver is not active so he device is not decoding CAN data. After CAN data is recognized by the LP receiver, the device enters an active listing mode and turns on the SW receiver. In order to decode the CAN data to monitor for a wake-up frame (WUF) the device must draw additional current. In this state the VSUP pin will draw the quiescent 20uA + biasing current 15uA + selective wake current 400uA for a total of near 435uA nominal. Note that a non-partial networking enabled node would be fully active in this state and be drawing tens of mA in order to monitor the CAN bus. If the CAN bus returns to an idle state (tSILENCE is met), the TCAN1145 will return to the lower power state by turning off the bus bias and SW receiver so only the quiescent 20uA of current will be consumed. If a WUF appears while the transceiver is in its active listening mode the device will wake into Standby mode in order to activate the MCU. 

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

    Regards,
    Eric Schott