JPH0393901U - - Google Patents
Info
- Publication number
- JPH0393901U JPH0393901U JP235890U JP235890U JPH0393901U JP H0393901 U JPH0393901 U JP H0393901U JP 235890 U JP235890 U JP 235890U JP 235890 U JP235890 U JP 235890U JP H0393901 U JPH0393901 U JP H0393901U
- Authority
- JP
- Japan
- Prior art keywords
- analog multiplexer
- input
- constant voltage
- diode
- voltage
- 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.)
- Granted
Links
- 230000002159 abnormal effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Safety Devices In Control Systems (AREA)
Description
図面は本考案に係わるアナログマルチプレクサ
の入力保護回路の一実施例を示す回路図である。
３……アナログマルチプレクサ、Ｄ……電源端
子、Ｘ１〜Ｘ４……入力チヤンネル、Ｙ……出力
端子、Ｉ１ａ，Ｉ２ａ……信号電圧入力端子、６
……定電圧回路、１０……入力保護回路、１１…
…第１ダイオード、１２……第２ダイオード、１
５……入力抵抗、２０……補助定電圧回路。
The drawing is a circuit diagram showing an embodiment of an input protection circuit for an analog multiplexer according to the present invention. 3...Analog multiplexer, D...Power terminal, X1 to X4 ...Input channel, Y...Output terminal, I1a , I2a ...Signal voltage input terminal, 6
... Constant voltage circuit, 10 ... Input protection circuit, 11 ...
...First diode, 12...Second diode, 1
5...Input resistance, 20...Auxiliary constant voltage circuit.
Claims (1)
て動作するアナログマルチプレクサを、異常入力
電圧から保護するために、アナログマルチプレク
サの各入力チヤンネルとこれに対応する信号電圧
入力端子との間に介在された入力抵抗と、カソー
ドがアナログマルチプレクサの各入力チヤンネル
に接続されアノードが接地された第１ダイオード
と、アノードがアナログマルチプレクサの各入力
チヤンネルに接続された第２ダイオードとを備え
た入力保護回路において、さらに、アナログマル
チプレクサの電源電圧となる上記定電圧より低い
補助定電圧を発生させる補助定電圧回路を備え、
上記第２ダイオードのカソードをこの補助定電圧
回路に接続したことを特徴とするアナログマルチ
プレクサの入力保護回路。 In order to protect the analog multiplexer, which operates using the constant voltage from the constant voltage circuit as the power supply voltage, from abnormal input voltage, an analog multiplexer is inserted between each input channel of the analog multiplexer and the corresponding signal voltage input terminal. An input protection circuit comprising an input resistor, a first diode having a cathode connected to each input channel of the analog multiplexer and an anode connected to ground, and a second diode having an anode connected to each input channel of the analog multiplexer, further comprising: , equipped with an auxiliary constant voltage circuit that generates an auxiliary constant voltage lower than the above constant voltage, which is the power supply voltage of the analog multiplexer,
An input protection circuit for an analog multiplexer, characterized in that the cathode of the second diode is connected to the auxiliary constant voltage circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990002358U JP2579611Y2 (en) | 1990-01-17 | 1990-01-17 | Detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990002358U JP2579611Y2 (en) | 1990-01-17 | 1990-01-17 | Detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0393901U true JPH0393901U (en) | 1991-09-25 |
| JP2579611Y2 JP2579611Y2 (en) | 1998-08-27 |
Family
ID=31506235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990002358U Expired - Lifetime JP2579611Y2 (en) | 1990-01-17 | 1990-01-17 | Detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2579611Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57102217U (en) * | 1980-12-16 | 1982-06-23 | ||
| JPS6032525A (en) * | 1983-08-01 | 1985-02-19 | 株式会社デンソー | Input circuit for electronic controller for vehicle |
-
1990
- 1990-01-17 JP JP1990002358U patent/JP2579611Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57102217U (en) * | 1980-12-16 | 1982-06-23 | ||
| JPS6032525A (en) * | 1983-08-01 | 1985-02-19 | 株式会社デンソー | Input circuit for electronic controller for vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2579611Y2 (en) | 1998-08-27 |
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