Microcontroller Input

Discussion in 'Embedded Systems and Microcontrollers' started by DancinNancy, Feb 8, 2009.

  1. DancinNancy

    Thread Starter Member

    Oct 1, 2008
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    probably a simple question but does anyone know how high a voltage the microcontroller needs before it notices an input? Like is .5 Volts high enough or does it need at least 2?
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    What microcontroller are you referring to?

    hgmjr
     
  3. DancinNancy

    Thread Starter Member

    Oct 1, 2008
    24
    0
    the pic32 microcontroller
     
  4. DancinNancy

    Thread Starter Member

    Oct 1, 2008
    24
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    i dont know the full name of it off the top of my head but it is the one that comes with the starter kit...its something like pic32mx...
     
  5. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Most of the inputs on a PIC are TTL compatible thus every voltage above 2.4V will be read as high. However, not all the inputs have the same logic levels, read the datasheet to see which are TTL and which not.
     
  6. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    A quick check of the PIC32MX family electrical parameters section of the datasheet indicates that a high is defined as 0.8*Vdd and a low is defined as an input that is 0.15*Vdd.

    hgmjr
     
  7. DancinNancy

    Thread Starter Member

    Oct 1, 2008
    24
    0
    Thank you very much hgmr
     
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