Strobing scheme and keyboard sensing circuit for a one chip calc

Details Strobing scheme and keyboard sensing circuit for a one chip calc Strobing scheme and keyboard sensing circuit for a one chip calc

1975-06-23

1976-11-02

Curtis, Marshall M.

Communications: electrical

Systems

With specific power supply

307205, 340324M, 340365S, G09B 1300

Patent

active

039900703

ABSTRACT:
Circuitry having a unique strobing scheme to effectively drive both a light-emitting diode display and an associated keyboard directly from a single semiconductor chip. The circuitry accurately senses which of the keyboard keys is in a depressed condition in order that a suitable representation thereof may be displayed at an appropriate time.

REFERENCES:
patent: 3761620 (1973-09-01), Graven
patent: 3781852 (1973-12-01), White et al.
patent: 3909631 (1975-09-01), Kitagawa
patent: 3925686 (1975-12-01), Nomiya
patent: 3935474 (1976-01-01), Komarek

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