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TCA9544A: I/O state

Shu-Cheng LIN
Guru 11785 points
Part Number: TCA9544A


Hi Sirs,

Sorry to bother you.

May i know what I/O state when power on but I2C host not start send data? is pull high?

Because we saw function block looks there have internal 100K PU high resistor, or i''m wrong?

  • 0
    TI__Guru* 75301 points
    Hey Shu,

    "May i know what I/O state when power on but I2C host not start send data? is pull high?"
    Yes, the I/O ports will be referenced to the Vcc through the 100k pull up resistor. (After being powered on and not programmed yet)

    "Because we saw function block looks there have internal 100K PU high resistor, or i''m wrong?"
    You are correct.

    Thanks,
    -Bobby