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TCAN1145-Q1: Quiescent current with selective wake enabled

Matt Guibord
Genius 17340 points
Part Number: TCAN1145-Q1

Hello,

I am trying to figure out the quiescent current of the TCAN1145-Q1 during sleep mode when selective wake is enabled. Am I interpreting it correctly that the SUP current should be the sleep current (20 uA) plus the "additional current when CAN bus is listening" (15 uA) for a total ISUP of 35 uA (typ)? Or is the sleep current (20 uA) plus the "additional current when selective wake is enabled and bus active" (400 uA) for a total ISUP of 420 uA?

And for ICC, is it simply the sleep mode current of 2.5 uA (typ)?

Thanks,
Matt Guibord

  • 0
    TI__Guru 74252 points

    Matt,

    Thanks for bringing this to E2E, I'm checking with our systems team on this for the ISUP current because I agree the datasheet is a bit unclear. 

    For ICC, that is correct, the sleep mode current is only 2.5uA.

    Regards,

  • 0 in reply to Eric Hackett
    TI__Guru 74252 points

    Matt,

    I got some more clarification on this.

    Your interpretation is correct, when the device is asleep, selective wake is enabled and the CAN bus is biased to 0V, the current is 35uA max. When the device is in sleep mode, selective wake is enabled and the CAN bus is biased to 2.5V, the current consumption is max 75uA. Then if the device is in sleep mode, selective wake is enabled, and there is CAN communication on the bus from other nodes, the current consumption is 35uA + 550uA maximum.

    Thanks for pointing this out, and brining it to E2E. Please let us know if you have any other questions.

    Regards,

  • 0 in reply to Eric Hackett
    TI__Genius 17340 points

    Hi Eric,

    Thanks for the response, this is clear! One follow up though...

    When the device is in sleep mode with selective wake enabled and there is activity on the CAN bus, does the current jump to the 550 uA (max) just due to the activity? Or does the current jump only after the WUP signal is received and the WUF receiver is activated? What would happen to the current if the specific module was not asked to wake (and goes back to sleep) but the CAN bus remains active due to other ECUs communicating?

    Regards,
    Matt Guibord

  • 0 in reply to Matt Guibord
    TI__Guru 74252 points

    Matt,

    It's due to the activity and the bus being biased to 2.5V from the WUP being received. If the WUP is received and the WUF receiver is activated but there is no activity, the current should be maximum 75uA.

    Does this make sense?

    Regards,