Patent ID: 6486871
Filing Date: 2002-11-26
Classification: G05G,G06F,H02J,H03L,H03M,Y02D

Abstract:
Apparatus comprising:a resistor bridge sensor having first, second, third, and fourth resistances, said first resistance connected between first and second terminals, said second resistance connected between said second terminal and a third terminal, said third resistance connected between said third terminal and a fourth terminal, said fourth resistance connected between said fourth and first terminals; a first switch connecting the first terminal of the sensor through a resistor selectively to a first potential or to a second potential; a second switch connecting the first terminal of the sensor selectively to a first potential, to a second potential, or to an open connection; a third switch connecting the third terminal of the sensor selectively to a first potential or to a second potential; a multiplexer having first, second, third, and fourth terminals, said multiplexer selectively connecting one of said first, second, and third terminals of the multiplexer to the fourth terminal of the multiplexer; said first terminal of said multiplexer connected to said first terminal of said sensor; said second terminal of said multiplexer connected to said fourth terminal of said sensor; said third terminal of said multiplexer connected to said second terminal of said sensor.