I'm not so sure about this.
I *think* it is;
pin 1: ground
pin 2: audio
pin 3: battery
Note that pins on the minXLR go *in order* 1, 2, 3 around the connector, while regular XLR goes 1, 3, 2.
If in doubt, unscrew the miniXLR and look inside. On AT853 you'll see red = battery = pin 3, yellow = audio = pin 2, shield = ground = pin 1.
A small number of AT gear has yellow replaced by white.
Richard