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mikewilliamson9
mikewilliamson9
Associate II
February 9, 2009
Question

GPIO output modes wrt impedence

  • February 9, 2009
  • 1 reply
  • 578 views
Posted on February 09, 2009 at 09:57

GPIO output modes wrt impedence

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    1 reply

    mikewilliamson9
    mikewilliamson9Author
    Associate II
    May 17, 2011
    Posted on May 17, 2011 at 13:02

    I have checked through the stm32 documentation especially 13902.pdf

    I cannot find an explicit explanation of the GPIO output modes. The modes are for maximum output speeds of 10, 2 and 50MHz. I assume that internally the slew rate of the pin is being limited. Is this performed by impedance changing or some active method?

    Particularly I am interested to know how this would affect the impedance of the pin seen from the outside.

    Has anyone had any issues regarding termination and using different output modes?

    Perhaps STOne-32 could shed some light on this?

    Thanks.

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