Patent ID: 8259081

Claim:
An integrated circuit comprising: a first pair of terminals; a second pair of terminals; a control circuit that during a first time period supplies one of a plurality of selectable voltages onto a first of the first pair of terminals and that couples a second of the first pair of terminals to a ground potential, and that during a second time period supplies said one of the plurality of selectable voltages onto a first of the second pair of terminals and that couples a second of the second pair of terminals to the ground potential; and an analog-to-digital converter (ADC) that measures a first voltage present on one of the terminals of the second pair of terminals during the first time period and generates therefrom a first measurement value, and that measures a second voltage present on one of the terminals of the first pair of terminals during the second time period and generates therefrom a second measurement value, wherein the first and second measurement values are touch screen point of contact location measurements, wherein the ADC has a convertible input voltage range over which it can generate an output measurement corresponding to a voltage on an input of the ADC, and wherein a voltage difference between said one of the selectable voltages and ground potential is substantially smaller than the convertible input voltage range.