JPH0195680U - - Google Patents
Info
- Publication number
- JPH0195680U JPH0195680U JP19257187U JP19257187U JPH0195680U JP H0195680 U JPH0195680 U JP H0195680U JP 19257187 U JP19257187 U JP 19257187U JP 19257187 U JP19257187 U JP 19257187U JP H0195680 U JPH0195680 U JP H0195680U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- primary battery
- volatile memory
- detected
- backup
- 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 claims description 8
- 230000006866 deterioration Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Stand-By Power Supply Arrangements (AREA)
Description
第１図はこの考案の揮発性メモリバツクアツプ
用１次電池の劣化検出回路の１実施例のブロツク
図、第２図は従来の劣化検出回路を備えたマイク
ロコンピユータシステムのブロツク図である。
１……バツクアツプ用１次電池、３……揮発性
メモリ、４……逆流防止用のダイオード、５……
給電ライン、９……スイツチ、１０……電圧判定
回路、１１……マイクロコンピユータ。
FIG. 1 is a block diagram of one embodiment of the deterioration detection circuit for a primary battery for volatile memory backup according to the present invention, and FIG. 2 is a block diagram of a microcomputer system equipped with a conventional deterioration detection circuit. 1... Primary battery for backup, 3... Volatile memory, 4... Diode for backflow prevention, 5...
Power supply line, 9... switch, 10... voltage determination circuit, 11... microcomputer.
Claims (1)
オードを介して接続されたバツクアツプ用１次電
池の電圧を検出するとともに、検出した電圧と基
準電圧とを比較して前記１次電池の放電劣化を検
出する揮発性メモリバツクアツプ用１次電池の劣
化検出回路において、 電圧検出端子が常開のスイツチを介して前記ダ
イオードと前記１次電池との接続点に接続された
電圧判定回路と、周期的に短期間だけ前記スイツ
チを閉成するスイツチ制御手段とを備え、 かつ、前記電圧判定回路に、前記スイツチの閉
成によつて前記検出端子に印加された前記１次電
池の電圧を検出する電圧検出手段と、該電圧検出
手段の検出電圧と前記基準電圧とを比較する電圧
比較手段と、該比較手段の比較結果の信号を放電
劣化の検出信号として出力保持する信号保持手段
とを設けた 揮発性メモリバツクアツプ用１次電池の劣化検
出回路。[Claims for Utility Model Registration] The voltage of a backup primary battery connected to the power supply line of a volatile memory via a diode for preventing backflow is detected, and the detected voltage is compared with a reference voltage to In a primary battery deterioration detection circuit for volatile memory backup that detects discharge deterioration of a primary battery, a voltage detection terminal is connected to a connection point between the diode and the primary battery via a normally open switch. comprising a voltage determination circuit and a switch control means for periodically closing the switch for a short period of time; Voltage detection means for detecting the voltage of the battery; voltage comparison means for comparing the detected voltage of the voltage detection means with the reference voltage; and a signal for outputting and holding a comparison result signal of the comparison means as a discharge deterioration detection signal. A deterioration detection circuit for a primary battery for volatile memory backup, which is equipped with a holding means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19257187U JPH0195680U (en) | 1987-12-17 | 1987-12-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19257187U JPH0195680U (en) | 1987-12-17 | 1987-12-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0195680U true JPH0195680U (en) | 1989-06-23 |
Family
ID=31483421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19257187U Pending JPH0195680U (en) | 1987-12-17 | 1987-12-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0195680U (en) |
-
1987
- 1987-12-17 JP JP19257187U patent/JPH0195680U/ja active Pending