Datasheet

Power Pins
GND - this is the common ground for all power and logic
BAT - this is the positive voltage to/from the JST jack for the optional Lipoly battery
USB - this is the positive voltage to/from the micro USB jack if connected
EN - this is the 3.3V regulator's enable pin. It's pulled up, so connect to ground to disable the 3.3V regulator
3V - this is the output from the 3.3V regulator, it can supply 500mA peak
Logic pins
© Adafruit Industries
https://learn.adafruit.com/adafruit-feather-32u4-radio-with-rfm69hcw-
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