Semiconductor integrated circuit device

Patent metadata

Field	Value
Publication number	US-8994569-B2
Application number	US-201314023642-A
Country	US
Kind code	B2
Filing date	Sep 11, 2013
Priority date	Feb 18, 2011
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

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 MP 1 , MP 2 , and MPc, and first, second, and third NMOS transistors MN 1 , MN 2 , 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 MN 2 and the second PMOS transistor MP 2 are turned on, and the first NMOS transistor MN 1 , the first PMOS transistor MP 1 , the third PMOS transistor MPc, and third the NMOS transistor MNc are turned off.

First claim

What is claimed is:

1. A microcontroller, formed over a semiconductor chip, 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, wh…

Assignees

• Renesas Electronics Corp

Inventors

• Ebata Tomohiko
• Aso Takuji

Classifications

• H03M1/1225

  Electricity · mapped topic

• H03M1/1076 Primary

  Electricity · mapped topic

• H03M1/12 Primary

  Electricity · mapped topic