NFC Disengagement

Other Hardware General Electronics
1

I have NFC module and tag in a system, I am trying to disconnect it without disconnecting the Modules from the PCB, any advice or suggestion for it.

Thanks in advance

2

are you saying that you want it to be removed from being supplied power or do you want to just to have your arduino think its no longer there?

3

pictures or full description would help us help you.

4

Usually the easier way to power down a peripheral is this:

  1. Set all the OUTPUT pins connected to it to INPUT
  2. switch its Vcc off using a PNP or pFET and another pin dedicated to controlling the power.

Reversing the procedure is the exact reverse.

Using a PNP or pFET switch means you can keep grounds common, which often finesses some
problems. Google 'high side switching'.

Its vital not to phantom-power the peripheral so those logic outputs connected to it must be
disabled whenever the thing is powered down. Google 'phantom power' and 'CMOS latchup'.

But if a module has an enable or shutdown pin anyway, that is the thing to use.