Patent ID: 8859124

Claim:
An integrated circuit comprising: a voltage detection means for detecting a first voltage to be applied between a positive electrode and a negative electrode of one or a plurality of secondary batteries; a power supply means for generating a second voltage including a predetermined voltage; a first input terminal to which a third voltage value according to the value of a current flowing in the secondary battery is input; a second input terminal which receives an output from the voltage detection means; a mode switch terminal, wherein the first input terminal, the second input terminal, and the mode switch terminal are different terminals; and a control means, including the first input terminal, the second input terminal, and the mode switch terminal, for outputting from the control means (i) an overcharge detection signal or (ii) an overdischarge detection signal, in accordance with the first voltage detected by the voltage detection means, while the predetermined voltage is input to the mode switch terminal from the power supply means causing the integrated circuit to operate in a voltage detector mode, and for outputting from the control means (iii) a charge control signal or (iv) a discharge control signal, in accordance with (v) the first voltage detected by the voltage detection means or (vi) the third voltage value to be input to the first input terminal, while the predetermined voltage is not input to the mode switch terminal from the power supply means causing the integrated circuit to operate in a protection mode, wherein the control means is for outputting the overcharge detection signal or the charge control signal with a changed output level in response to an overcharge state or a charge overcurrent state being detected, and wherein the control means is for outputting the overdischarge detection signal or the discharge control signal with the changed output level in response to an overdischarge state or a discharge overcurrent state being detected.