I plugged the AVR Stick (DEV-09147) into the USB port and it worked first time, logging 0 on both inputs. However there is a big difference in the current drawn by the two inputs. With 0.9V in, PB4 draws 0.8mA, whilst PB3 draws 33mA!!! The voltage across the LED and its resistor connected to PB3 are correct. The current is being drawn by the chip itself. Is this correct operation ?