Title: Low voltage battery indicator for a solid state watch

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.

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Inventors: Bergey, John M. (Lancaster, PA, US)
O'Connor, Arthur H. (Lancaster, PA, US)

Application Number: 519637
Filing Date: 1974-10-31
Publication_date: 1976-11-16
Assignee: Time Computer, Inc. (Lancaster, PA)
Primary Class(es): 368/66 340/636.15, 340/661, 340/663, 340/691.8, 340/693.3, 368/202, 968/448, 968/505, 968/DIG1
Other Classes:
US Patent Ref:

3532968	Oct, 1970	Overlie	340/249.
3672155	Jun, 1972	Bergey et al.	58/50.
3678499	Jul, 1972	McCarty	340/336.
3760584	Sep, 1973	Dargent	58/50.
3832629	Aug, 1974	Cernek	340/248.
3866406	Feb, 1975	Roberts	58/4.
3898790	Aug, 1975	Takamune et al.	58/50.

Other Refs:
Primary Examiner: Jackmon, E. S.
Assistant Examiner:
Attorney: LeBlanc & Shur