I can ADUM2201 pin14 (VDD) and pin 15 (NC) are shorted together to to vcc it?
This way it will damage the IC?
Pin 15 has no internal connection - it does not connect to any internal circuitry. Therefore this pin can be connected to any convenient supply or ground. This is true of all pins marked NC…
There is also no risk for long-term connection for the ADuM221N0. Pin 15 is not connected to internal circuitry at all - it is an open circuit (same situation as the ADuM2201).