Patent ID: 8706432
Filing Date: 2014-04-22
Classification: G06F

Abstract:
1. A method of measuring resistance in each of a plurality of resistors arranged in a resistor matrix, each resistor being located at a different intersection between a column conductor and a row conductor, and each resistor selectively connecting that column conductor to that row conductor with a variable resistance, the method comprising: applying a column conductor voltage and a row conductor voltage to determine an offset error row current of each row conductor; scanning each row conductor to identify if that row conductor is connected to a column conductor by one of the plurality of resistors; if that row conductor is connected to a column conductor by one of the plurality of resistors, scanning each resistor connected to that row conductor to determine if that resistor is connecting a column conductor to that row conductor; and if that resistor is connecting a column conductor to that row conductor, outputting an offset compensated resistance of that resistor calculated from a row current measured for that resistor less the offset error row current for that row conductor.