What is NC and DNU pin and what should I do with them?
NC (Not Connected) pin
NC means: No Connected pin, which means that the pin is not internally connected to the die. So, it can be either left floating or tied to GND or tied to VCC.
DNU (Do Not Use) pin
DNU means: Do Not Use. DNU pins might be used for test mode entry and hence these pins must be left unconnected/floating.
Translation from Japanese: NCピンとDNUピンについて - Community Translated (JA)
