| 摘要 |
A battery voltage detecting circuit for detecting a low battery voltage condition. A memory stores a reference digital voltage signal defining a digital value of a reference voltage level of a battery. A battery voltage measuring circuit digitally measures battery voltage and develops a digital voltage output signal representative of the measured battery voltage. The battery voltage measuring circuit includes a voltage-pulse signal generator which generates a number of pulses representative of battery voltage, and a counter circuit for counting the pulses and for developing a digital count representative of the measured battery voltage. A digital comparator circuit compares the refrence digital voltage signal and the digital voltage signal representing battery voltage for comparing the same and for developing an output signal when the digital voltage signal representing battery voltage coincides with the reference digital voltage signal.
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