Switch interface for determining position of a plurality of swit

Details Switch interface for determining position of a plurality of swit Switch interface for determining position of a plurality of swit

1989-12-20

1991-10-15

Pellinen, A. D.

Electrical transmission or interconnection systems

Combined impedance and switch systems

341147, H03M 166, G05F 100

Patent

active

050576992

ABSTRACT:
A circuit for interfacing switches to a component which allows the positions of the switches to be determined by the component. The component includes an input port and an output port. A switch network which is a parallel combination of two or more series combinations of a resistor and a switch is connected between the input and output port. A capacitor is connected between the input port and ground. The component determines switch positions by outputting a voltage on the output port and determining the time for the capacitor to charge to a predetermined value. Since each series combination has a unique resistance, the position of the switches therein can be determined in accordance with the capacitor charging time.

REFERENCES:
patent: Re33119 (1989-11-01), Baker
patent: 4190824 (1980-02-01), Weber
patent: 4306223 (1981-12-01), Weber
patent: 4315413 (1982-02-01), Baker
patent: 4488823 (1984-12-01), Baker
patent: 4883991 (1989-11-01), Kroner et al.

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