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Multiple pull-down inputs

Discussion in 'General Electronics Discussion' started by ErikMichiels, Mar 29, 2013.

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  1. ErikMichiels

    ErikMichiels

    1
    0
    Mar 29, 2013
    Hello,

    Do I have to use 4 separate resistors for connecting 4 digital inputs with my MCU? Or could I use 1 general pull-down resisitor?

    Thansk in advance!
     
  2. BobK

    BobK

    7,676
    1,685
    Jan 5, 2010
    If they are unused inputs, yes. If you expect to use them as seperate inputs, you cannot connect them together.

    Bob
     
  3. gorgon

    gorgon

    603
    24
    Jun 6, 2011
    If these 'inputs' are configurable in/outputs, you can just configure them as outputs with no pulldowns. Most IO on a MCU can be programmed with a week pullup, so you may leave them unconnected too. This you need to lookup in the datasheet for the MCU.
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,309
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    Jan 21, 2010
    But if they are inputs, and they are being used, you'll need a pull-down resistor on each (assuming you need a pull down)
     
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