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TCA9554: how to setting for unused pin

dimitry chen
Intellectual 985 points
Part Number: TCA9554

Hi 

my design is i2c to 4 bit,

what should i do for anther 4 unused pin

pull down ? or register setting ?

  • 0
    TI__Mastermind 47895 points

    Hi Dimitry,

    All P-pins have internal 100-kOhm pull-up resistors to keep them from floating. Unused pins can be left floating or tied to Vcc through external pull-ups (resistors to protect if accidentally configured as output lows). Registers can be left as inputs for low power leakage or set as output highs to avoid noise causing nINT glitches. 

    Let me know if you have any more questions.

    Regards,

    Eric