JPS6389127U - - Google Patents
Info
- Publication number
- JPS6389127U JPS6389127U JP18126186U JP18126186U JPS6389127U JP S6389127 U JPS6389127 U JP S6389127U JP 18126186 U JP18126186 U JP 18126186U JP 18126186 U JP18126186 U JP 18126186U JP S6389127 U JPS6389127 U JP S6389127U
- Authority
- JP
- Japan
- Prior art keywords
- battery
- power supply
- voltage
- card
- circuit
- 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
- 230000003068 static effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Techniques For Improving Reliability Of Storages (AREA)
Description
第１図は本考案の一実施例を説明するためのバ
ツテリ電圧検出機能付ＩＣカードの回路図、第２
図は従来の一例を説明するためのＩＣカードの回
路図である。
１……スタテイツクＲＡＭ、２……バツテリ、
３……基準電圧発生回路、４……電圧比較回路、
５……表示回路、６，７……電源切換および逆流
防止用ダイオード、ａ，ｂ……外部電源端子。
Fig. 1 is a circuit diagram of an IC card with a battery voltage detection function for explaining one embodiment of the present invention;
The figure is a circuit diagram of an IC card for explaining a conventional example. 1...Statistic RAM, 2...Battery,
3... Reference voltage generation circuit, 4... Voltage comparison circuit,
5... Display circuit, 6, 7... Diode for power switching and backflow prevention, a, b... External power supply terminal.
Claims (1)
の電圧低下を検出して表示する回路とを有するＩ
Ｃカードにおいて、前記バツテリの電圧を検出し
て基準電圧と比較する比較回路と前記表示回路と
の電源端子を外部のシステム電源に接続するため
の外部電源端子に直接接続し、これら電源端子と
前記バツテリとの間にバツテリ電圧を阻止する方
向にダイオードを接続したことを特徴とするＩＣ
カード。 I having a static RAM, a battery, and a circuit that detects and displays a voltage drop of the battery.
In the C card, the power supply terminals of the comparison circuit that detects the battery voltage and compares it with a reference voltage and the display circuit are directly connected to an external power supply terminal for connecting to an external system power supply, and these power supply terminals and the An IC characterized in that a diode is connected between the battery and the battery in a direction that blocks battery voltage.
card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18126186U JPS6389127U (en) | 1986-11-25 | 1986-11-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18126186U JPS6389127U (en) | 1986-11-25 | 1986-11-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6389127U true JPS6389127U (en) | 1988-06-10 |
Family
ID=31125966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18126186U Pending JPS6389127U (en) | 1986-11-25 | 1986-11-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6389127U (en) |
-
1986
- 1986-11-25 JP JP18126186U patent/JPS6389127U/ja active Pending
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