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
Application number
JP18961286U
Other languages
Japanese (ja)
Other versions
JPH054055Y2 (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP18961286U priority Critical patent/JPH054055Y2/ja
Publication of JPS6392976U publication Critical patent/JPS6392976U/ja
Application granted granted Critical
Publication of JPH054055Y2 publication Critical patent/JPH054055Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Semiconductor Memories (AREA)
  • Credit Cards Or The Like (AREA)

Description

【図面の簡単な説明】[Brief explanation of drawings]

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)

【実用新案登録請求の範囲】[Scope of utility model registration request] スタテイツクRAMとバツテリとそのバツテリ
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.
JP18961286U 1986-12-08 1986-12-08 Expired - Lifetime JPH054055Y2 (en)

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)

Also Published As

Publication number Publication date
JPH054055Y2 (en) 1993-02-01

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