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TCAN4550-Q1: WAKE pin resistance and unused termination

Shinji Tsuji
Genius 15394 points

Part Number: TCAN4550-Q1
Other Parts Discussed in Thread: TCAN1043-Q1

Hi team,

Could you advise how much is the WAKE pin internal resistance?

I would not use WAKE function, and would like to pull this pin to GND.

Could you give me the recommended pull down resistor value?

regards,

  • 0
    TI__Guru 74962 points

    Tsuji-san,

    This WAKE circuit is similar to the WAKE circuit on TCAN1043-Q1 in that if it not being used, it can be shorted to battery or GND directly with no resistor. Once the device detects the WAKE pin state, internal pull-down/pull-up circuits are activated to minimize the amount of current used. If the WAKE pin is tied directly to VBAT, there is slightly less (~1-3uA) current consumption than if it is tied to GND.

    Please let me know if you have any other questions.

    Regards,

  • 0 in reply to Eric Hackett
    TI__Genius 15394 points

    Hi Eric,

    If you don't use WAKE function and connect the pin to BATT, should I use current limiting resistor

    to protect this pin from negative pulse on BATT to exceed absolute max rating of 3mA?

    regards

  • 0 in reply to Shinji Tsuji
    TI__Guru 62920 points

    Hello Tsuji-san,

    Yes, you should not exceed the 3-mA absolute maximum limit.  If WAKE could be exposed to a negative voltage, then a current limiting resistance should be used.

    Regards,
    Max