Electronic timepiece battery monitoring circuit
First Claim
1. In an electronic timepiece including a battery for producing a supply voltage and a battery detection circuit for detecting when the supply voltage of said battery falls below a predetermined level and in response thereto produces a detection signal, the improvement comprising monitoring means for producing an indication signal in response to said detection signal being applied thereto, a load means adapted to be selectively coupled to said battery and in response thereto place an additional load thereon, and inhibit means coupled to said battery detection circuit and said monitoring means, said inhibit means being further coupled to said load means for inhibiting said detection signal from being applied to said monitoring means when said load means is coupled to said battery.
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Abstract
A battery monitoring circuit for an electronic wristwatch that avoids an inadvertent indication of battery failure when a sudden, but temporary, load is placed upon the battery is provided. The invention is characterized by a monitoring circuit that produces an indication signal of impending failure of the battery in response to a detection signal being applied thereto. The detection signal is produced by a battery detection circuit when the voltage of the battery falls below a predetermined level. An inhibit circuit is coupled intermediate the voltage detection circuit and the monitoring circuit and detects when a temporary load is placed upon the battery and, in response thereto, inhibits the detection signal from being applied to the monitoring circuit to thereby prevent an indication signal, representative of imminent battery failure, from being produced as a result of an additional load being temporarily placed upon the battery.
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Citations
11 Claims
- 1. In an electronic timepiece including a battery for producing a supply voltage and a battery detection circuit for detecting when the supply voltage of said battery falls below a predetermined level and in response thereto produces a detection signal, the improvement comprising monitoring means for producing an indication signal in response to said detection signal being applied thereto, a load means adapted to be selectively coupled to said battery and in response thereto place an additional load thereon, and inhibit means coupled to said battery detection circuit and said monitoring means, said inhibit means being further coupled to said load means for inhibiting said detection signal from being applied to said monitoring means when said load means is coupled to said battery.
Specification