JPS6392976U - - Google Patents
Info
- Publication number
- JPS6392976U JPS6392976U JP18961286U JP18961286U JPS6392976U JP S6392976 U JPS6392976 U JP S6392976U JP 18961286 U JP18961286 U JP 18961286U JP 18961286 U JP18961286 U JP 18961286U JP S6392976 U JPS6392976 U JP S6392976U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- battery
- displays
- detects
- 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
- 238000001514 detection method Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Semiconductor Memories (AREA)
- Credit Cards Or The Like (AREA)
Description
第１図は本考案の第一の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図は本考案の第二の実施例を説明するための
ＩＣカードの回路図、第３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……バツテリ電圧検出回路、
７……スイツチ、８，９……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 the first embodiment of the present invention;
FIG. 2 is a circuit diagram of an IC card for explaining a second embodiment of the present invention, and FIG. 3 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...Battery voltage detection circuit,
7...Switch, 8, 9...Power switching and backflow prevention diode, 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す
る電圧検出回路を、基準電圧発生回路とバツテリ
電圧および基準電圧を比較する比較回路と前記比
較回路の出力によりバツテリ電圧の低下を表示す
る表示回路とで形成し、前記電圧検出回路のうち
の少なくとも表示回路と外部電源端子との間をス
イツチを介して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, a voltage detection circuit that detects the voltage of the battery is formed by a reference voltage generation circuit, a comparison circuit that compares the battery voltage and the reference voltage, and a display circuit that displays a decrease in battery voltage based on the output of the comparison circuit. An IC card characterized in that at least a display circuit of the voltage detection circuit and an external power supply terminal are connected via a switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18961286U JPH054055Y2 (en) | 1986-12-08 | 1986-12-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18961286U JPH054055Y2 (en) | 1986-12-08 | 1986-12-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6392976U true JPS6392976U (en) | 1988-06-15 |
| JPH054055Y2 JPH054055Y2 (en) | 1993-02-01 |
Family
ID=31142075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18961286U Expired - Lifetime JPH054055Y2 (en) | 1986-12-08 | 1986-12-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH054055Y2 (en) |
-
1986
- 1986-12-08 JP JP18961286U patent/JPH054055Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH054055Y2 (en) | 1993-02-01 |
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