Patent ID: 7034581

Claim:
A voltage detecting circuit, comprising: a first terminal connected to a positive pole of a battery; a second terminal connected to a negative pole of the battery; a voltage dividing circuit that divides a voltage across the battery; a reference voltage circuit that generates a reference voltage; a comparator that compares outputs of the reference voltage circuit and the voltage dividing circuit and outputs a comparison signal; a first output circuit connected between the first terminal and the second terminal for outputting a first output signal on the basis of the comparison signal output by the comparator; an output terminal for outputting the first output signal; and a second output circuit connected between the output terminal and one of the first and second terminals for outputting a second output signal that changes in value on the basis of a first signal and a second signal at the first terminal and the second terminal, respectively, the second output circuit comprising a depletion-type n-channel MOS transistor and a depletion-type p-channel MOS transistor connected in series between the output terminal and one of the first terminal and the second terminal; wherein the first signal at the first terminal is input to a gate electrode of the depletion-type p-channel MOS transistor, and the second signal at the second terminal is input to a gate electrode of the depletion-type n-channel MOS transistor.