Patent ID: 8610613

Claim:
A semiconductor integrated circuit device comprising an input port connected to a first power supply voltage via a first resistor and connected to, an analog signal input terminal to be measured via a second resistor having a resistance lower than the first resistor; a first MIS transistor of a first conductivity type, wherein a first end of a source/drain is connected to the input port; a second MIS transistor of a second conductivity type, wherein the first end of a source/drain is connected to the input port; a first wiring path which connects a second end of the source/drain of the first MIS transistor and the second end of the source/drain of the second MIS transistor to a first node; an analog/digital conversion circuit converting a voltage of the first node into a digital signal; and a first cycle and a second cycle to be executed in detecting a presence or absence of a disconnection in a path from the analog signal input terminal to the input port, wherein in the first cycle, the first and second MIS transistors are turned off and the first wiring path is pre-charged to the first power supply voltage, and wherein in the second cycle to be executed subsequent to the first cycle, the first and second MIS transistors are turned on and an operation by the analog/digital conversion circuit is performed.