Wristwatch calculator with interface chip
First Claim
1. A wristwatch having a case in which are mounted a clock chip, a calculator chip, a plurality of electro-optical display stations, a manually operated time display mode switch connected to said clock chip for coupling said clock chip to said display stations, a plurality of manually operated keyboard switches, including a calculator display mode switch, mounted in said case and connected to said calculator chip for alternatively coupling said calculator chip to said display stations, an interface chip having inputs connected to outputs of the clock and calculator chips and outputs connected to the display stations, said interface chip containing substantially all of the circuits necessary to multiplex the clock and calculator outputs to display the desired output as commanded by the time display mode and calculator mode switches, and an inertia switch in said case and connected to said interface chip, said interface chip having means for detecting a predetermined pattern of movement of said inertia switch and for generating a time demand signal upon detection of said predetermined pattern of movement to select the watch display mode, whereby time is displayed at said display stations.
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Accused Products
Abstract
An improved wristwatch calculator has all of the active circuit elements contained on three chips mounted on the same substrate member in the watch case. A watch chip and a calculator chip each have their outputs connected to a single interface chip consisting of CMOS or I2 L active elements which multiplex the watch and calculator chip outputs and select the appropriate display as a function of watch mode selection by pushbutton or inertia time demand switches or calculator mode selection by activation of the appropriate calculator keyboard switch on the watch face. The interface chip outputs are connected to six electro-optical display stations.
8 Citations
9 Claims
- 1. A wristwatch having a case in which are mounted a clock chip, a calculator chip, a plurality of electro-optical display stations, a manually operated time display mode switch connected to said clock chip for coupling said clock chip to said display stations, a plurality of manually operated keyboard switches, including a calculator display mode switch, mounted in said case and connected to said calculator chip for alternatively coupling said calculator chip to said display stations, an interface chip having inputs connected to outputs of the clock and calculator chips and outputs connected to the display stations, said interface chip containing substantially all of the circuits necessary to multiplex the clock and calculator outputs to display the desired output as commanded by the time display mode and calculator mode switches, and an inertia switch in said case and connected to said interface chip, said interface chip having means for detecting a predetermined pattern of movement of said inertia switch and for generating a time demand signal upon detection of said predetermined pattern of movement to select the watch display mode, whereby time is displayed at said display stations.
Specification