Multiple pull-down inputs

[ErikMichiels]

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!

 

[BobK]

If they are unused inputs, yes. If you expect to use them as seperate inputs, you cannot connect them together.

Bob

 

[gorgon]

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.

 

[(*steve*)]

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)