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Is TM4C129x series GPIO capiable of output 1.8 volts

Jason
Intellectual 805 points

Is there any way to get a GPIO output voltage level of 1.8. I was thinking of an open drain but this isnt a valid solution, what about changing an input voltage rail or something like that. I know there are level translators for this i was just wondering if it could be done with out it.

  • 0
    Guru 47900 points

    Not directly - nor easily mefears...

    No mention of your current need/demand is provided.   If very light (sub 2 mA or so) you may "get away" w/simple resistive, voltage divider.  You can "beef that up" via the imposition of an op-amp - between that aforementioned voltage divider and the "real world."  (that should get you to the 10-15mA range)

    There is a downside - you will likely lose some GPIO speed (both rise & fall times) and reduce the output speed capability of that "boosted GPIO."

  • 0
    TI__Guru**** 244400 points

    Hello JWL,

    No there is no way to do that on TM4C129 or TM4C123. The IO voltage is derived from the VDDS and if you reduce the voltage you would trip the POR BOR.

    Advise is to use an external level translator.

    Regards

    Amit