JPH03222215A - Switching condition detection circuit - Google Patents
Switching condition detection circuitInfo
- Publication number
- JPH03222215A JPH03222215A JP1605990A JP1605990A JPH03222215A JP H03222215 A JPH03222215 A JP H03222215A JP 1605990 A JP1605990 A JP 1605990A JP 1605990 A JP1605990 A JP 1605990A JP H03222215 A JPH03222215 A JP H03222215A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- input
- output terminal
- resistor
- capacitor
- 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 title claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Keying Circuit Devices (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はスイッチの状態を検出する方式に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for detecting the state of a switch.
（従来の技術）
従来はプルアップ抵抗（又はプルダウン抵抗）とスイッ
チを直列接続した回路を電源の■とグランド間に接続し
、プルアップ抵抗（又はプルダウン抵抗）とスイッチの
接続点の電圧を読み込むことによりスイッチのＯＮ、Ｏ
ＦＦ状態を検出している。(Conventional technology) Conventionally, a circuit in which a pull-up resistor (or pull-down resistor) and a switch are connected in series is connected between the power supply ■ and the ground, and the voltage at the connection point between the pull-up resistor (or pull-down resistor) and the switch is read. Depending on whether the switch is ON or O
FF state is detected.
（発明が解決しようとする課題）
従来のプルアップ抵抗（又はプルダウン抵抗）とスイッ
チを直列接続した回路を電源の■とグランド間に接続し
、プルアップ抵抗（又はプルダウン抵抗）とスイッチの
接続点の電圧を読み込むことによりスイッチのＯＮ、Ｏ
ＦＦ状態を検出する回路では、スイッチがＯＮのときに
プルアップ抵抗（又はプルダウン抵抗）を通じて電流が
流れ、これがために装置の消費電流が増加し、とくに電
池により動作する装置では電池寿命が短くなる。(Problem to be solved by the invention) A circuit in which a conventional pull-up resistor (or pull-down resistor) and a switch are connected in series is connected between the power supply ■ and the ground, and the connection point between the pull-up resistor (or pull-down resistor) and the switch is The switch can be turned ON or OFF by reading the voltage of
In the circuit that detects the FF state, current flows through the pull-up resistor (or pull-down resistor) when the switch is ON, which increases the current consumption of the device and shortens the battery life, especially in devices that operate on batteries. .
（課題を解決するための手段と作用）
本発明は上述の不具合を解決するため、スイッチ、コン
デンサ、抵抗を並列に接続した回路を装置の入出力端子
とグランド間に接続し、入出力端子からパルスを出力し
、その後入出力端子に接続したコンデンサの充電電圧を
読み込むことにより、プルアップ抵抗（又はプルダウン
抵抗）に電流を流すことなくスイッチのＯＮ、 ＯＦＦ
状態を検出することが可能であり、従って装置の消費電
流の省力化を計ることが可能とな（実施例）
以下図面により本発明の一実施例について詳細に説明す
る。(Means and effects for solving the problem) In order to solve the above problems, the present invention connects a circuit in which a switch, a capacitor, and a resistor are connected in parallel between the input/output terminal of the device and the ground, and connects the circuit from the input/output terminal to the ground. By outputting a pulse and then reading the charging voltage of the capacitor connected to the input/output terminal, the switch can be turned on and off without flowing current to the pull-up resistor (or pull-down resistor).
It is possible to detect the state, and therefore it is possible to reduce the power consumption of the device (Embodiment) An embodiment of the present invention will be described in detail below with reference to the drawings.
第２図は従来のスイッチ状態検出回路を示すもので、検
出回路１０２．プルアップ抵抗Ｒ，入力端子■、スイッ
チＳＷよりなる。FIG. 2 shows a conventional switch state detection circuit, in which the detection circuit 102. It consists of a pull-up resistor R, an input terminal ■, and a switch SW.
検出回路１０２に、プルアップ抵抗Ｒ１と入力端子■を
通じてｅ電圧が加わっている場合は、スイッチＳＷがＯ
ＦＦ していると検出できる。When the voltage e is applied to the detection circuit 102 through the pull-up resistor R1 and the input terminal
It can be detected if it is FF.
検出回路１０２に入力端子■を通じてグランド電圧が加
わっている場合は、スイッチＳＷがＯＮ していると検
出できる。When the ground voltage is applied to the detection circuit 102 through the input terminal (2), it can be detected that the switch SW is turned on.
このとき■−プルアップ抵抗Ｒ１−スイッチ−グランド
の経路で電流Ｉが流れ、従って消費電流Ｉは増加する。At this time, the current I flows through the path ①-pull-up resistor R1-switch-ground, and therefore the current consumption I increases.
第１図は本発明の一実施例を示すスイッチ状態検出回路
であり、パルス出力回路１０１．検出回路１０２．入出
力端子■。FIG. 1 shows a switch state detection circuit showing an embodiment of the present invention, in which a pulse output circuit 101. Detection circuit 102. Input/output terminal■.
トランジスタＱ１．コンデンサＣＩ＋抵抗Ｒｔ、保護抵
抗Ｒ２。Transistor Q1. Capacitor CI + resistor Rt, protection resistor R2.
スイッチＳＷよりなる。It consists of a switch SW.
パルス出力回路１０１によりトランジスタＱ、のベース
にパルスを加えてトランジスタＱ１をＯＮさせ２次にト
ランジスタＱ１をＯＦＦさせたとき、入出力端子■ を
通じて検出回路１０２にグランド電圧が加わっている場
合は、スイッチＳＷがＯＮ していると検出できる。When the pulse output circuit 101 applies a pulse to the base of the transistor Q to turn on the transistor Q1 and then turn off the transistor Q1, if ground voltage is applied to the detection circuit 102 through the input/output terminal, the switch It can be detected if the SW is turned on.
トランジスタＱ、がＯＮ している時間を短くすること
により、保護抵抗Ｒ２とスイッチＳＷを通じて電流が流
れる時間は短くなるので、消費電流の増加は防止できる
。By shortening the time during which the transistor Q is ON, the time during which current flows through the protection resistor R2 and the switch SW is shortened, so an increase in current consumption can be prevented.
入出力端子■を通じて検出回路］０２に■電圧が加わっ
ている場合は、スイッチＳＷがＯＦＦ していると検出
できる。If the voltage ■ is applied to the detection circuit]02 through the input/output terminal ■, it can be detected that the switch SW is OFF.
この場合の回路創作は、パルス出力回路１０１によりト
ランジスタＱ、のベースにパルスを加えてトランジスタ
Ｑｌ’ｆｒ： ＯＮさせ、入出力端子■を通してコンデ
ンサＣ１を充電し、 その後にトランジスタＱ＋をＯＦ
Ｆさせると、コンデンサＣ１は■電圧に充電された後コ
ンデンサＣ１と抵抗Ｒ１の時定数によりコンデンサＣ１
の電荷が放電する。To create a circuit in this case, the pulse output circuit 101 applies a pulse to the base of the transistor Q, turns on the transistor Ql'fr, charges the capacitor C1 through the input/output terminal ■, and then turns off the transistor Q+.
When the capacitor C1 is charged to the voltage F, the capacitor C1 is charged by the time constant of the capacitor C1 and resistor R1
charge is discharged.
このとき、検出回路１０２には入出力端子■を通じてコ
ンデンサＣＩに充電されている■電圧が加わるので、ス
イッチＳＷがＯＦＦ していると検出できる。At this time, since the voltage (2) charged in the capacitor CI is applied to the detection circuit 102 through the input/output terminal (2), it can be detected that the switch SW is OFF.
トランジスタＱｌがＯＮすることによりコンデンサＣｉ
を充電する電流はわずかであり、従って消費電流は増加
しない。When transistor Ql turns on, capacitor Ci
The charging current is small, so current consumption does not increase.
パルス出力回路１０１から一定周期（例えば１秒おき）
又はスイッチＳＷの状態を検出する必要が生じたとき１
こ、パルスを出力してトランジスタＱｌをＯＦＦ→ＯＮ
−＋ＯＦＦさせることにより消費電流の増加なしにスイ
ッチＳＷの状態を検出することができるので、低消費電
流であることを要求される電池動作の計算機、電子手帳
などの機能切替スイッチに利用できる。from the pulse output circuit 101 at a constant cycle (for example, every 1 second)
Or when it becomes necessary to detect the state of the switch SW 1
This outputs a pulse and turns the transistor Ql OFF → ON
- Since the state of the switch SW can be detected without increasing current consumption by turning it OFF, it can be used as a function changeover switch for battery-operated calculators, electronic notebooks, etc. that require low current consumption.
（発明の効果）
以上説明したように本発明のスイッチ状態検出回路によ
り。(Effects of the Invention) As explained above, by the switch state detection circuit of the present invention.
装置の消費電流を増加させることなくスイッチのＯＮ、
ＯＦＦを検出することができ、電池により動作する装置
では電池寿命を長くすることができる。Turn on the switch without increasing the current consumption of the device.
OFF can be detected, and battery life can be extended in devices operated by batteries.
第１図は本発明の一実施例を示すスイッチ状態検出回路
のブロック図である。FIG. 1 is a block diagram of a switch state detection circuit showing one embodiment of the present invention.
Claims (1)
、装置の入出力端子とグランド間に、スイッチとコンデ
ンサと抵抗とを並列接続したものを挿入し、パルス出力
回路のパルスを入出力端子を経て出力し、暫時後、入出
力端子に接続したコンデンサの充電電圧を検出回路によ
り読み込むことにより、スイッチのＯＮ、ＯＦＦ状態を
検出することを特徴とするスイッチ状態検出回路。(1) In a device equipped with a pulse output circuit and a detection circuit, insert a switch, a capacitor, and a resistor connected in parallel between the input/output terminal of the device and the ground, and then connect the pulse of the pulse output circuit to the input/output terminal. 1. A switch state detection circuit that detects an ON or OFF state of a switch by reading the charged voltage of a capacitor connected to an input/output terminal with a detection circuit after a while.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1605990A JPH03222215A (en) | 1990-01-29 | 1990-01-29 | Switching condition detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1605990A JPH03222215A (en) | 1990-01-29 | 1990-01-29 | Switching condition detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03222215A true JPH03222215A (en) | 1991-10-01 |
Family
ID=11906002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1605990A Pending JPH03222215A (en) | 1990-01-29 | 1990-01-29 | Switching condition detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03222215A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000014756A1 (en) * | 1998-09-07 | 2000-03-16 | Seiko Epson Corporation | Switch operated state detector and electronic device |
| JP2006234783A (en) * | 2005-01-28 | 2006-09-07 | Yazaki Corp | Device for measuring voltage |
| EP2141559A1 (en) * | 2008-07-01 | 2010-01-06 | EM Microelectronic-Marin SA | Timepiece fitted with a control case for an electric motor |
| JP2012180026A (en) * | 2011-03-02 | 2012-09-20 | Yazaki Corp | Switch state detector and controller having the same |
| JP2016197115A (en) * | 2008-01-29 | 2016-11-24 | 株式会社日立製作所 | Battery system and battery monitoring device |
-
1990
- 1990-01-29 JP JP1605990A patent/JPH03222215A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000014756A1 (en) * | 1998-09-07 | 2000-03-16 | Seiko Epson Corporation | Switch operated state detector and electronic device |
| US6353522B1 (en) | 1998-09-07 | 2002-03-05 | Seiko Epson Corporation | Switching state detecting device for switch, and electronic apparatus |
| JP2006234783A (en) * | 2005-01-28 | 2006-09-07 | Yazaki Corp | Device for measuring voltage |
| JP2016197115A (en) * | 2008-01-29 | 2016-11-24 | 株式会社日立製作所 | Battery system and battery monitoring device |
| EP2141559A1 (en) * | 2008-07-01 | 2010-01-06 | EM Microelectronic-Marin SA | Timepiece fitted with a control case for an electric motor |
| US7944777B2 (en) | 2008-07-01 | 2011-05-17 | Em Microelectronic-Marin Sa | Watch fitted with an electric motor control case |
| JP2012180026A (en) * | 2011-03-02 | 2012-09-20 | Yazaki Corp | Switch state detector and controller having the same |
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