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TCA9535: TCA9535 IO Input pin state

Jim Tseng
Intellectual 2250 points
Part Number: TCA9535

Hello Expert,

Could you help to check the IO state when we set it as a input? What’s value of impedance in IO pin?

thanks

Jim

  • +1
    TI__Mastermind 23743 points

    Jim,

    When the I/O is set as an input, the pin is put into a High-Z state. There are no internal pullup resistors to pull to VCC or GND. Looking at the input leakage current spec from the datasheet, we can expect the impedance of the I/O to ,change as the input voltage changes. At max conditions, assume Ileak = 1uA and VCC=5.5V, we can calculate that the impedance of the I/O pin is VCC/Ileak >= 5.5Mohm. 

    Regards,

    -Tyler