Low voltage battery indicator for a solid state watch

Details Low voltage battery indicator for a solid state watch Low voltage battery indicator for a solid state watch

1974-10-31

1976-11-16

Jackmon, E. S.

Communications: electrical

Land vehicle alarms or indicators

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

58 50R, 58152H, 340248B, G04C 300, G04B 1930, G04B 3712, G08B 2100

Patent

active

039915530

ABSTRACT:
Disclosed is a solid state wristwatch having a digital light emitting diode display and a low battery voltage circuit for actuating the display to indicate the approach of battery failure. The battery voltage sensing circuit draws power only when the display is energized and causes one of the display stations to blink. It comprises a silicon band gap reference voltage circuit for comparing the battery voltage with a reference voltage that is independent of temperature and battery voltage variations.

REFERENCES:
patent: 3532968 (1970-10-01), Overlie
patent: 3672155 (1972-06-01), Bergey et al.
patent: 3678499 (1972-07-01), McCarty
patent: 3760584 (1973-09-01), Dargent
patent: 3832629 (1974-08-01), Cernek
patent: 3866406 (1975-02-01), Roberts
patent: 3898790 (1975-08-01), Takamune et al.

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