JPS60126836U

JPS60126836U - matrix input circuit

Info

Publication number: JPS60126836U
Application number: JP1219384U
Authority: JP
Inventors: 羽鳥　仁
Original assignee: 日本電気ホームエレクトロニクス株式会社
Priority date: 1984-01-31
Filing date: 1984-01-31
Publication date: 1985-08-26

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図Ａ、　Ｂは、それぞれ従来のマトリクス入力回路
に用いられるスイッチ回路の一例を示す回路図、第２，
３図は、それぞれ本考案のマトリクス入力回路の一実施
例を示す概略回路構成図及び要部回路図である。２・・・アドレス信号線、３・・・入力信号線、１１・
・・−マトリクス入力回路、１２・・・マイクロコンピ
ュータ、１２ａ・・・出力ポート、１２ｂ・・・入力ポ
ート、１３・・・スイッチ回路、１３ａ・・・入力キー
スイッチ、１３ｂ、１３ｃ・・・ダイオード、Ｒｏ、Ｒ
・・・抵抗。1A and 1B are circuit diagrams showing an example of a switch circuit used in a conventional matrix input circuit, respectively.
FIG. 3 is a schematic circuit configuration diagram and a main part circuit diagram, respectively, showing one embodiment of the matrix input circuit of the present invention. 2...Address signal line, 3...Input signal line, 11.
...-Matrix input circuit, 12... Microcomputer, 12a... Output port, 12b... Input port, 13... Switch circuit, 13a... Input key switch, 13b, 13c... Diode , Ro, R
···resistance.

Claims

[Scope of utility model registration request]

a plurality of address signal lines to which address signals are sequentially inputted in a time-sharing manner; a plurality of input signal lines that intersect with the plurality of address signal lines in a matrix; and an intersection between the input signal line and the address signal line. In a matrix input circuit consisting of a switch circuit provided in a section, each of the plurality of input signal lines has one end connected to a DC power supply via a pull-up resistor, and the switch circuit has cathodes connected to each other. , a pair of diodes whose anodes are connected to an address signal line and an input signal line, respectively, and a resistor having a resistance value sufficiently lower than that of the pull-up resistor, one end of which is commonly connected to the cathode of the pair of diodes. and a switch connected between the other end of the resistor and ground.