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PSoC™ 4

XiaoPing_Yang
New Contributor II

Hi Sir ,

      In my last discussion , Roy tell me that the unused pins  need not  be configured or be terminated to ground or supply through resistors of typical value of 10K Ohm. My customer now ask if unused pins could be configured internal pull up or pull down , so they can save the pcb space and resistors .

     Thanks.

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LinglingG_46
Moderator
Moderator

I think it is not necessary to configure the unused pin to resistor pull up or pull down,   it is better to let the pin drive mode Analog High Z.

In the previous discussion, Roy gives suggestion that connect 10k resistor to unused pin , aims to avoid the instantaneous noise.

if customer configure the pin to pull up or pull down, it even can increase the damage risk.

As a conclusion, if the customer don't want to let connect the 10k resistor to unused pin, they can let them float, or connect to Ground direct.

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