Electronic watch

Details Electronic watch Electronic watch

1977-08-23

1979-07-03

Anagnos, Larry N.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

58 23BA, 58152H, 307200B, 307304, 340636, 340663, H03K 3353, H03K 518, G08B 2100

Patent

active

041601769

ABSTRACT:
A circuit for detecting battery voltage for example in an electronic watch in order to provide a warning that the battery is almost depleted comprises two NOT circuits connected across the battery terminals. Each of the NOT circuits comprises a P-channel MOS transistor and an N-channel MOS transistor. The output of the first NOT circuit is connected to the input of the second NOT circuit and also through a biasing resistance to the input of the first NOT circuit. The output of the second NOT circuit is connected to circuitry for presenting a visual display when the output is inverted. When the voltage of the battery drops below a predetermined level, the output of the second NOT circuit is inverted to provide an indication that the battery is nearing depletion.

REFERENCES:
patent: 3628070 (1971-12-01), Heuner et al.
patent: 3898790 (1975-08-01), Takamune et al.
patent: 3949545 (1976-04-01), Chihara
patent: 3999368 (1976-12-01), Yoshida
patent: 4001808 (1977-01-01), Ebihara et al.
patent: 4024415 (1977-05-01), Matsuura
patent: 4032864 (1977-06-01), Yamashiro et al.
patent: 4037399 (1977-07-01), Chihara
patent: 4041691 (1977-08-01), Chihara et al.
patent: 4043112 (1977-08-01), Tanaka
patent: 4074515 (1978-02-01), Asano

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