I'm using the LPC2148 and have a serious problem. I'm using one of the ADC channels to measure battery voltage (across 2AA cells). When the microcontroller is off there is a current drain path from the batteries through the ADC which flattens the batteries in a few days with the board off.... The input impedance of the ADC is shown as 20k ohms so it is not possible to put a large resistor in series... Please can you help?
Message
ADC leakage on LPC2148....?
2006-02-08 by myfriendmarkis