JPH01120609A - Ic memory card - Google Patents
Ic memory cardInfo
- Publication number
- JPH01120609A JPH01120609A JP62279620A JP27962087A JPH01120609A JP H01120609 A JPH01120609 A JP H01120609A JP 62279620 A JP62279620 A JP 62279620A JP 27962087 A JP27962087 A JP 27962087A JP H01120609 A JPH01120609 A JP H01120609A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- terminal
- memory card
- voltage
- card
- 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
- 239000004065 semiconductor Substances 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Power Sources (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、揮発性メモリとそのデータをバックアップ
するための電池を搭載したＩＣメモリカードに関し、特
にその電池電圧の検出端子への取り出し方法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an IC memory card equipped with a volatile memory and a battery for backing up its data, and particularly relates to a method for extracting the battery voltage to a detection terminal. .
従来、この種のＩＣメモリカードとして、第２図に示す
ようなものがあった。この図において、１は電源切換回
路、２はメモリＩＣ，３はダイオード、４は抵抗、５は
一次電池、６は抵抗、７゜８はそれぞれ電源切換回路１
の入力端子、出力端子、１０は電源端子、１）は接地端
子、１２は電池電圧検出端子である。Conventionally, there has been an IC memory card of this type as shown in FIG. In this figure, 1 is a power supply switching circuit, 2 is a memory IC, 3 is a diode, 4 is a resistor, 5 is a primary battery, 6 is a resistor, and 7° and 8 are power supply switching circuits 1 and 2.
10 is a power supply terminal, 1) is a ground terminal, and 12 is a battery voltage detection terminal.
次に動作について説明する。Next, the operation will be explained.
第２図に示すメモリカードにおいて、電源切換回路１で
は、その入力端子７に電源端子１０より印加される電圧
のレベルが、あらかじめ設定されたレベル（例えば、約
４Ｖ）より高い場合、入力端子７に印加された電圧とほ
ぼ等しい電圧が出力端子８より出力される。この場合の
電源切換回路１の人出力特性を、第３図に実線にて示す
。In the memory card shown in FIG. 2, in the power supply switching circuit 1, when the level of the voltage applied to the input terminal 7 from the power supply terminal 10 is higher than a preset level (for example, about 4V), the input terminal 7 A voltage approximately equal to the voltage applied to is output from the output terminal 8. The human output characteristics of the power supply switching circuit 1 in this case are shown by the solid line in FIG.
又、入力端子７に印加される電圧が、あらかじ゛め設定
されたレベルより低い場合、出力端子８は開放となり、
そこには、−次電池５の電圧を■３、メモリＩＣ２に流
れ込む電流によって生ずるダイオード３．抵抗４の電圧
降下をそれぞれＶ、、Ｖっとすると、（Ｖｍ Ｖｏ
Ｖ＋＋）なる電圧が現われる０例えば、−次電池５の
電圧を３Ｖ、抵抗４の抵抗値を１．５（ｋΩ〕、メモリ
［Ｃ２に流れ込む電流を数十〔μＡ〕とすると、ダイオ
ード３のカソードに約２．５（Ｖ）程度の電圧が現われ
る。Furthermore, when the voltage applied to the input terminal 7 is lower than the preset level, the output terminal 8 becomes open.
There, there is a diode 3. which is generated by the current flowing into the memory IC 2. If the voltage drop across resistor 4 is V, , V, then (Vm Vo
For example, if the voltage of the negative battery 5 is 3V, the resistance value of the resistor 4 is 1.5 (kΩ), and the current flowing into the memory [C2] is several tens [μA], then the cathode of the diode 3 A voltage of about 2.5 (V) appears.
その様子を、第３図に破線で表わす。This situation is shown in FIG. 3 by broken lines.
なお、−次電池５の電圧は抵抗６を介して電池電圧検出
端子１２より検出できる。Note that the voltage of the negative battery 5 can be detected from the battery voltage detection terminal 12 via the resistor 6.
従来のＩＣメモリカードは以上のように構成されている
ので、カードの携帯時あるいは保管時、誤って、又は故
意に電池電圧検出端子１２と接地端子１）とがショート
された場合に一次電池５が放電してメモリＩＣ２のデー
タが消えてしまう、又、電池電圧検出端子１２には常に
一次電池５の電圧が印加されているため近辺に０ （Ｖ
） １）位の端子があると電蝕が生じるなどの問題点が
あった。Since the conventional IC memory card is configured as described above, if the battery voltage detection terminal 12 and the ground terminal 1) are accidentally or intentionally short-circuited when the card is carried or stored, the primary battery 5 is discharged and the data in the memory IC 2 disappears.Also, since the voltage of the primary battery 5 is always applied to the battery voltage detection terminal 12, there is a voltage of 0 (V) in the vicinity.
) There were problems such as galvanic corrosion if there were terminals in position 1).
この発明は上記のような問題点を解消するためになされ
たもので、携帯時あるいは保管時には電池電圧検出端子
に一次電池の電圧が出力されないようにすることができ
、誤って、又は故意にショートされても一次電池は放電
してしまうこと・がなく、メモリＩＣのデータを保護す
ることができるＩＣメモリカードを提供することを目的
とする。This invention was made to solve the above-mentioned problems, and it is possible to prevent the voltage of the primary battery from being output to the battery voltage detection terminal during carrying or storage, and prevents accidental or intentional short-circuiting. To provide an IC memory card capable of protecting data in a memory IC without discharging a primary battery even when the battery is used.
この発明に係るＩＣメモリカードは、メモリのデータを
バックアップする電池とこの電池の電圧を取り出すため
の外部接続端子との間に半導体スイッチを挿入したもの
である。The IC memory card according to the present invention has a semiconductor switch inserted between a battery for backing up data in the memory and an external connection terminal for extracting the voltage of the battery.
この発明においては、電池とその外部接続端子との間に
直列に半導体スイッチを挿入することにより、そのＯＮ
、ＯＦＦ制御で電池の電圧を外部接続端子に出力したり
、しなかったりできる。In this invention, by inserting a semiconductor switch in series between the battery and its external connection terminal, the ON
, OFF control allows you to output the battery voltage to the external connection terminal or not.
以下、この発明の一実施例を図について説明す゛る。第
１図において、１はセット側より供給される電源とカー
ド内部の電池による電源とを切換える電源切換回路、２
は揮発性のメモリＩＣｌ３は一次電池に充電電流が流れ
ないようにするためのダイオード、４はダイオード３が
誤ってショートした場合に一次電池に流れ込む電流を制
限するための抵抗、５は一次電池、６は抵抗、７．８は
それぞれ電源切換回路ｌの入力端子、出力端子、ｌＯは
電源端子、１）は接地端子、１２は電池電圧検出端子、
１３は半導体スイッチ、１４．１５はその入力端子、出
力端子、１６はスイッチ１３をＯＮ、ＯＦＦさせる制御
端子、１７は抵抗である。An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a power supply switching circuit that switches between the power supply supplied from the set side and the power supply from the battery inside the card; 2
is a volatile memory ICl3 is a diode to prevent charging current from flowing to the primary battery, 4 is a resistor to limit the current flowing to the primary battery if diode 3 is accidentally short-circuited, 5 is a primary battery, 6 is a resistor, 7.8 is the input terminal and output terminal of the power supply switching circuit l, respectively, lO is the power supply terminal, 1) is the ground terminal, 12 is the battery voltage detection terminal,
13 is a semiconductor switch, 14 and 15 are its input terminals and output terminals, 16 is a control terminal for turning the switch 13 ON and OFF, and 17 is a resistor.
第１図に示すＩＣメモリカードにおいて、従来のカード
と異なる点について詳細に説明する。カードの携帯時あ
るいは保管時には、電源端子１０と接地端子１）間に電
力が供給されない（電圧が印加されない）ために、半導
体スイッチ１３の制御端子１６は、スイッチ１３をＯＦ
Ｆさせるのに十分な”Ｌ”レベルとなり、−次電池５の
＋側電極と電池電圧検出端子１２とは遮断される。一方
、カードのセット（システム）への装着時にはセット側
より電源端子１０と接地端子１）間に電力が供給される
（約５（ｖ）の電圧が印加される）ことにより、半導体
スイッチ１３の制御端子１６はスイッチ１３をＯＮさせ
るのに十分な“Ｈ”レベルとなり、−次電池５の電圧が
電池電圧検出端子１２に出力されると同時にセット側の
電池電圧検出回路に入力される。The differences between the IC memory card shown in FIG. 1 and conventional cards will be explained in detail. When the card is carried or stored, no power is supplied (no voltage is applied) between the power terminal 10 and the ground terminal 1), so the control terminal 16 of the semiconductor switch 13 turns the switch 13 OFF.
The level becomes low enough to cause F, and the + side electrode of the negative battery 5 and the battery voltage detection terminal 12 are cut off. On the other hand, when the card is installed in a set (system), power is supplied from the set side between the power supply terminal 10 and the ground terminal 1) (approximately 5 (V) voltage is applied), so that the semiconductor switch 13 The control terminal 16 attains an "H" level sufficient to turn on the switch 13, and the voltage of the negative battery 5 is output to the battery voltage detection terminal 12 and simultaneously input to the battery voltage detection circuit on the set side.
このようなメモリカードでは、携帯時あるいは保管時に
は電池電圧検出端子に一次電池の電圧が出力されないよ
うにすることができ、誤って、又は故意にショートされ
ても一次電池は放電してしまうことがなく、又、近辺に
Ｏ（Ｖ）電位の端子があっても電蝕が生じることはない
。With such a memory card, it is possible to prevent the primary battery voltage from being output to the battery voltage detection terminal when it is carried or stored, and the primary battery will not be discharged even if it is accidentally or intentionally shorted. Furthermore, even if there is a terminal at O(V) potential nearby, galvanic corrosion will not occur.
以上のように、この発明に係るＩＣメモリカードによれ
ば、電池の電圧を半導体スイッチを介して外部端子に取
り出すように構成したので、カードの携帯時あるいは保
管時にはスイッチをＯＦＦとして電池の電圧が出力され
ないようにでき、誤゛って、あるいは故意に端子がショ
ートされても電池が放電することを防止でき、信頼性の
高いデータ保持が可能となり、電池の電蝕を防止できる
効果がある。As described above, according to the IC memory card of the present invention, the voltage of the battery is taken out to the external terminal via the semiconductor switch, so when carrying or storing the card, the switch is turned OFF and the voltage of the battery is It is possible to prevent the output from being output, prevent the battery from discharging even if the terminals are accidentally or intentionally short-circuited, enable highly reliable data retention, and have the effect of preventing electrolytic corrosion of the battery.
第１図はこの発明の一実施例によるＩＣメモリカードの
一部を示すブロック図、第２図は従来のＩＣメモリカー
ドの一部を示すブロック図、第３図はＩＣメモリカード
の電源切換回路の入出力端子の電圧特性の一例を示す図
である。
２はメモリＩＣｌ３は一次電池、１２は電源電圧検出端
子、１３は半導体スイッチ。
なお、図中、同一符号は同一、又は相当部分を示す。Fig. 1 is a block diagram showing a part of an IC memory card according to an embodiment of the present invention, Fig. 2 is a block diagram showing a part of a conventional IC memory card, and Fig. 3 is a power supply switching circuit of the IC memory card. FIG. 3 is a diagram illustrating an example of voltage characteristics of input/output terminals of FIG. 2 is a memory ICl3 which is a primary battery, 12 is a power supply voltage detection terminal, and 13 is a semiconductor switch. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
ップする電池とを内蔵したＩＣメモリカードにおいて、 上記電池と該電池の電圧を取り出すための外部接続端子
との間に介在する半導体スイッチを備えたことを特徴と
するＩＣメモリカード。(1) An IC memory card containing a volatile semiconductor memory element and a battery for backing up its data, including a semiconductor switch interposed between the battery and an external connection terminal for extracting the voltage of the battery. An IC memory card featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62279620A JPH01120609A (en) | 1987-11-04 | 1987-11-04 | Ic memory card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62279620A JPH01120609A (en) | 1987-11-04 | 1987-11-04 | Ic memory card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01120609A true JPH01120609A (en) | 1989-05-12 |
Family
ID=17613518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62279620A Pending JPH01120609A (en) | 1987-11-04 | 1987-11-04 | Ic memory card |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01120609A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5157247A (en) * | 1990-07-17 | 1992-10-20 | Mitsubishi Denki Kabushiki Kaisha | Ic card |
-
1987
- 1987-11-04 JP JP62279620A patent/JPH01120609A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5157247A (en) * | 1990-07-17 | 1992-10-20 | Mitsubishi Denki Kabushiki Kaisha | Ic card |
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