XIN1XOUT2VIO3GND4FIRE_UP5FIRE_DOWN6TSTO17INTN8SSN9SCK10SI11SO12RSTN13VCC14CLK32OUT15CLK32IN16NC17PTC18PT419PT320GND21VIO22PT223PT124NC25NC26STOP227GND28VCC29STOP130START31TSTO232EP33