SEMICONDUCTOR INTEGRATED CIRCUIT

摘要

PROBLEM TO BE SOLVED: To improve detection precision, to reduce cost and to reduce current consumption by controlling the voltage drop of high voltage in a high voltage drop part, switch-controlling reference voltage by means of a reference voltage switch part and setting a high voltage value detected in the high voltage detection part. SOLUTION: A control circuit 9 changes drop voltage Vd by changing the number of nMOS transistors in nMOS transistors Ta1-Tan. Then, it controls the reference voltage switch circuit 8 and changes reference voltage Vref inputted to a differential amplifier circuit 2. Thus, the high voltage Vh value detected in the high voltage detection circuit 1 is finely adjusted. Namely, drop voltage Vd inputted to the differential amplifier circuit 2 from the high voltage drop circuit 6 can be changed and reference voltage Vref inputted to the differential amplifier circuit 2 can be changed. Thus, the value of high voltage Vh which can be detected can finely be adjusted.