Patent ID: 6853306

Claim:
A circuit arrangement for measuring the resistances of resistors configured in a matrix form in a pressure-sensitive resistor mat arranged in a vehicle seat for detecting seat occupancy, the matrix including row conductors and column conductors, each row conductor being connected to each column conductor via a resistor, the circuit arrangement comprising: operational amplifiers, each of the row conductors and each of the column conductors connected to an output of a respective one of the operational amplifiers, a voltage being selectively appiled to an individual one a voltage can be selectively applied to the individual one of the resistors by activating at least one of the operational amplifiers when the one of the operational amplifiers is activated, the detected output current flowing through the individual one of the resistors; and a processor configured to determine a resistance value from the detected output current flowing through the individual one of the resistors and a voltage drop across the individual one of the resistors.