This is somewhat similar to this question about NC pins. In cases where the datasheet doesn't specify what to do with unused IC pins, what is the recommendation to do with these pins? In particular I'm thinking of GPIO pins for the AT32UC3C microcontroller, but also more generally for other IC types (for example multi op-amp IC's).
I can think of a few possible combinations:
- Provide a solder pad/hole so the chip is secured but leave pin floating.
- Connect the pin to ground (possible through a resistor/capacitor/etc.)
- Connect the pin to a supply source
- Something I can't possibly think of