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TM4C1292NCPDT: GPIO Hi-Z define

Eric Chen4
Expert 2370 points
Part Number: TM4C1292NCPDT

Hi,

Now using TM4C1292 and need to define GPIO Hi-Z but spec only define some status as below.

May I know if "Open Drian" is the same "Hi-Z" mean?

Thanks.

Regards,

Eric

  • 0
    TI__Guru**** 190806 points
    Hi,
    Normally you will need to have a pull up driver on the signal in a open drain configuration. If you drive the open drain pin to a logic 0 then the pin is pulled to ground. If you don't drive the pin then the state of the pin is pulled up to the 3.3V via a pullup resistor. Even though the chip has an internal weak pull resistor, you will want put an external pullup resistor externally.