SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE

摘要

The semiconductor integrated circuit device includes a T-type switch circuit TS[k] that is between an input port A[k] and an input terminal Ain of an analog/digital conversion circuit and that includes first, second, and third PMOS transistors MP1, MP2, and MPc, and first, second, and third NMOS transistors MN1, MN2, and MNc; and a fourth PMOS transistor MPu for pre-charging the input terminal Ain to a power supply voltage VCCA. In detecting the presence or absence of a disconnection from the input port A[k] to a signal input terminal Vint[k], first, the input terminal Ain is pre-charged to the power supply voltage VCCA via the fourth PMOS transistor MPu and also the second NMOS transistor MN2 and the second PMOS transistor MP2 are turned on, and the first NMOS transistor MN1, the first PMOS transistor MP1, the third PMOS transistor MPc, and third the NMOS transistor MNc are turned off.

主权项

1. 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 and a second end of a source/drain is connected to a first node; a second MIS transistor of a second conductivity type, wherein the first end of a source/drain is connected to the input port and a second end of a source/drain is connected to a first node; and a switch for connecting the first node and the first power supply voltage; an analog/digital conversion circuit converting a voltage of the first node into a digital signal, wherein the analog/digital conversion circuit detects a disconnection in a path from the analog signal input terminal to the input port by converting a voltage of the first node.