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TCAN1043A-Q1: WAKE pin

HISAYOSHI KUROSHIMA
Prodigy 40 points
Part Number: TCAN1043A-Q1

Similar to the application information described in the data sheet, we are considering a circuit that connects 12V Pullup to the WAKE terminal and detects LO when operating an external SW.

In the circuit described in the data sheet, 3kΩ is connected to the PULL-UP resistor of the WAKE terminal.
I would like to change the PULL-UP resistor from 3kΩ to 47kΩ for use, but could you please tell me if you have any concerns?

  • +1
    TI__Genius 11700 points

    Kuroshima-san,

    In a word, using a 47 kOhm resistor there would be perfectly fine. Referencing the same circuit described in the data sheet and section 8.4.1.5.2, the minimum resistor value that must be used in the place of the 33kOhm resistor can be calculated to be about 4 kOhm given that you are using a 12V supply. Then, assuming you are keeping the 33 kOhm resistor the same, the value of the resistor you want to change must simply be less than ~660 kOhm. In general, if the battery voltage never exceeds 45 V, then the resistor in question must always be less than 650 kOhm.

    This setup also meets the input voltage requirements for the wake pin. Please let us know if you have any other questions!

    Best,

    Malcolm