Patent ID: 6714064
Filing Date: 2004-03-30
Classification: G08C

Abstract:
A multiplexer circuit for detection of the switching state of a number of switching elements by means of a microprocessor in a motor vehicle, comprisinga number of signal inputs for receiving in each case one input signal, at least one signal output for outputting an output signal which corresponds to one of the input signals, at least one control input for receiving a control signal which selects at least one of the input signals for passing on to the at least one signal output, a sampling circuit which is connected to the signal inputs-, for sampling the signal inputs with a sampling signal in order to check the electrical state of the switching elements which are connected to the signal inputs with the sampling circuit being connected to the control input, wherein the sampling circuit applies the sampling signal to a group of signal inputs as a function of the control signal, and a number of signal inputs are jointly connected to said at least one signal output wherein only one of the jointly connected signal inputs is assigned to said group.