Is the thermal pad (Pin 45?) on the ATMEGA32U4 44pin QFN packages floating?
I used it to join all my Vcc pins in my PCB design and it's starting to feel like this was a bad idea. When I power up my prototypes they start to drain a lot of current above about 3 volts.
I can't seem to find any reference about this pin/pad in the data sheets or anywhere on the interwebs. Should I have left it floating or tied to GND instead of Vcc?