Semiconductor device for battery control and battery pack

A semiconductor device for battery control comprising:

• a charging transistor coupled in series to a battery;
• a control circuit capable of controlling turning on/off of the charging transistor;
• a CPU capable of controlling, via the control circuit, charging of the battery;
• a deep discharge detection circuit capable of detecting a deeply discharged state of the battery based on a reference voltage set as a threshold for detecting a deep discharge of the battery, and
• a switch circuit which, when a deeply discharged state of the battery is detected by the deep discharge detection circuit, preferentially sends the result of the detection made by the deep discharge detection circuit to the control circuit and, thereby, forcibly turns off the charging transistor regardless of charging control by the CPU.

A battery pack having a chargeable battery and a semiconductor device for battery control which can control charging of the battery, the semiconductor device for battery control comprising:

• a charging transistor coupled in series to the battery;
• a control circuit capable of controlling turning on/off of the charging transistor;
• a CPU capable of controlling, via the control circuit, charging of the battery;
• a deep discharge detection circuit capable of detecting a deeply discharged state of the battery based on a reference voltage set as a threshold for detecting a deep discharge of the battery, and
• a switch circuit which, when a deeply discharged state of the battery is detected by the deep discharge detection circuit, preferentially sends the result of the detection made by the deep discharge detection circuit to the control circuit and, thereby, forcibly turns off the charging transistor regardless of charging control by the CPU.