JPH01116833U - - Google Patents
Info
- Publication number
- JPH01116833U JPH01116833U JP1175088U JP1175088U JPH01116833U JP H01116833 U JPH01116833 U JP H01116833U JP 1175088 U JP1175088 U JP 1175088U JP 1175088 U JP1175088 U JP 1175088U JP H01116833 U JPH01116833 U JP H01116833U
- Authority
- JP
- Japan
- Prior art keywords
- key switch
- capacitive key
- circuit
- power supply
- capacitive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 2
Landscapes
- Input From Keyboards Or The Like (AREA)
Description
第１図は本考案の一実施例の回路図、第２図は
第１図の回路の動作を示す波形図、第３図は従来
回路の回路図、第４図はキーマトリツクスの概略
的な回路図、第５図はキースイツチの概略断面図
等価回路図、第６図は第３図の回路の動作を示す
波形図である。
１，９…マルチプレクサ、２，１０…デコーダ
、３…キースイツチ、６…ラツチ、７…マイコン
、８…キーマトリツクス、ＺＤ…ツエナーダイオ
ード、Ｃｏｍｐ１，Ｃｏｍｐ２…コンパレータ、
Ｒｘ０〜Ｒｘ１５，Ｒｙ０〜Ｒ１５，Ｒ１〜Ｒ７
…抵抗。
Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a waveform diagram showing the operation of the circuit of Fig. 1, Fig. 3 is a circuit diagram of a conventional circuit, and Fig. 4 is a schematic diagram of a key matrix. FIG. 5 is a schematic sectional view and equivalent circuit diagram of the key switch, and FIG. 6 is a waveform diagram showing the operation of the circuit of FIG. 3. 1, 9... Multiplexer, 2, 10... Decoder, 3... Key switch, 6... Latch, 7... Microcomputer, 8... Key matrix, ZD... Zener diode, Comp1, Comp2... Comparator,
Rx 0 to Rx 15 , Ry 0 to R 15 , R 1 to R 7
…resistance.
Claims (1)
り出される基準電圧とを電圧比較回路によつて比
較して該容量式キースイツチが押されたことを検
出する容量式キースイツチ検出回路において、該
電源と該電圧比較回路との間に定電圧回路を設け
、該定電圧回路によつて該基準電圧を安定化する
とともに該定電圧回路の出力を該容量式キースイ
ツチにも供給する構成とした容量式キースイツチ
検出回路。 In a capacitive key switch detection circuit that detects that the capacitive key switch has been pressed by comparing the output pulse of the capacitive key switch with a reference voltage taken out from a power supply by a voltage comparator circuit, the power supply and the voltage comparator circuit are used. A capacitive key switch detection circuit is provided with a constant voltage circuit between the capacitive key switch and the capacitive key switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1175088U JPH01116833U (en) | 1988-01-29 | 1988-01-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1175088U JPH01116833U (en) | 1988-01-29 | 1988-01-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01116833U true JPH01116833U (en) | 1989-08-07 |
Family
ID=31220575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1175088U Pending JPH01116833U (en) | 1988-01-29 | 1988-01-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01116833U (en) |
-
1988
- 1988-01-29 JP JP1175088U patent/JPH01116833U/ja active Pending