Multiplexing input device to be used in combination with an inte

Details Multiplexing input device to be used in combination with an inte Multiplexing input device to be used in combination with an inte

1991-12-12

1993-05-04

Chin, Tommy P.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340709, 340710, G09G 302

Patent

active

052085821

ABSTRACT:
A multiplexing input device is to be used in combination with an integrated computer mouse control circuit and includes a movement sensor unit and a key input control unit. The movement sensor unit and the key input control unit are connected to four input terminals of a controllable variable impedance unit. A timing control circuit has a sensor activating output which intermittently operates the movement sensor unit. The timing control circuit controls the resistance of the variable impedance unit according to the input signal to be sampled. A comparator unit is connected to the output terminals of the variable impedance unit. The output signals of the comparator unit are received by a demultiplexing unit. The demultiplexing unit has a first set of data outputs corresponding to the movement signals from the movement sensor and a second set of data outputs corresponding to the status of press keys on the key input control unit. The timing control circuit controls the demultiplexing unit to update the first set of data outputs to correspond with the output signals from the comparator unit upon generation of a movement sampling signal and to update the second set of data outputs to correspond with the output signals from the comparator unit upon generation of a key input sampling signal.

REFERENCES:
patent: 4313227 (1982-01-01), Eder
patent: 4891632 (1990-01-01), Chang
patent: 4963858 (1990-10-01), Chien

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