JP2003279603A5 - - Google Patents

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JP2003279603A5
JP2003279603A5 JP2002083004A JP2002083004A JP2003279603A5 JP 2003279603 A5 JP2003279603 A5 JP 2003279603A5 JP 2002083004 A JP2002083004 A JP 2002083004A JP 2002083004 A JP2002083004 A JP 2002083004A JP 2003279603 A5 JP2003279603 A5 JP 2003279603A5
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Japan
Prior art keywords
circuit
voltage
power supply
output
determination
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JP2002083004A
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Japanese (ja)
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JP2003279603A (en
JP4115727B2 (en
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Priority to JP2002083004A priority Critical patent/JP4115727B2/en
Priority claimed from JP2002083004A external-priority patent/JP4115727B2/en
Publication of JP2003279603A publication Critical patent/JP2003279603A/en
Publication of JP2003279603A5 publication Critical patent/JP2003279603A5/ja
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Publication of JP4115727B2 publication Critical patent/JP4115727B2/en
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Expired - Fee Related legal-status Critical Current

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Claims (3)

イネーブル信号を入力し、電圧判定回路で電源電圧を判定した後に入出力制御回路で電圧検出信号を出力してなる電源電圧検出回路であって、前記入出力制御回路は、動作制御部とラッチ回路部とを備え、前記電圧判定回路は、前記電源電圧と判定電圧とを比較した結果を前記ラッチ回路部に出力し、前記ラッチ回路部は、前記動作制御部に前記結果をフィードバックし、前記入出力制御回路で前記電圧判定回路の出力の変化を検出し、前記電圧判定回路を非動作とすることを特徴とする電源電圧検出回路。A power supply voltage detection circuit that receives an enable signal, determines a power supply voltage by a voltage determination circuit, and then outputs a voltage detection signal by an input / output control circuit. The input / output control circuit includes an operation control unit and a latch circuit and a section, before Symbol voltage judging circuit outputs the result of comparison between said supply voltage and the determination voltage to the latch circuit, the latch circuit feeds back the result to the operation control unit, A power supply voltage detection circuit, wherein the input / output control circuit detects a change in the output of the voltage determination circuit and deactivates the voltage determination circuit. 前記電圧判定回路は、判定電圧を決定する定電圧回路と抵抗分割回路と電圧比較回路と電源を遮断するスイッチ回路とを備え、
前記動作制御部からの入力信号がハイレベルで電源電圧が判定電圧よりも高いときは、前記電圧比較回路の出力がハイレベルに変化し、
前記動作制御部からの入力信号がローレベルのときには、前記定電圧回路と前記抵抗分割回路と前記電圧比較回路への電源供給を前記スイッチ回路で停止するとともに、前記電圧比較回路の出力をローレベルに固定してなることを特徴とする請求項１に記載の電源電圧検出回路。It said voltage determining circuit includes a switching circuit for interrupting the constant voltage circuit and a resistor divider circuit and a voltage comparison circuit power supply for determining the determination voltage,
When the input signal is supply voltage at a high level from the operation control unit is higher than the determination voltage, the output of the voltage comparator circuit is changed to the high level,
When the input signal from the operation control unit is at the low level, the power supply to the constant-voltage circuit and the resistive divider circuit and the voltage comparator circuit is stopped by the switching circuit, the output of the voltage comparator circuit The power supply voltage detection circuit according to claim 1 , wherein the power supply voltage detection circuit is fixed at a low level. 前記電圧判定回路は、判定電圧を決定する定電圧回路と抵抗分割回路と第一の電圧比較回路と第二の電圧比較回路と電源を遮断するスイッチ回路とを備え、
前記動作制御部からの入力信号がハイレベルで電源電圧が判定電圧よりも高いときは、前記第一の電圧比較回路の出力がハイレベルに変化し、
前記動作制御部からの入力信号がハイレベルで電源電圧が判定電圧よりも低いときは、前記第二の電圧比較回路の出力がハイレベルに変化し、
前記動作制御部からの入力信号がローレベルのときには、前記定電圧回路と前記抵抗分割回路と前記第一の電圧比較回路と前記第二の電圧比較回路への電源供給を前記スイッチ回路で停止するとともに、前記第一の電圧比較回路の出力をローレベルに固定し前記第二の電圧比較回路の出力をローレベルに固定してなることを特徴とする請求項１に記載の電源電圧検出回路。It said voltage determining circuit includes a switch circuit for interrupting the constant voltage circuit for determining the determination voltage and the resistor divider circuit and the first voltage comparison circuit and the second voltage comparator circuit and power supply,
When the input signal is supply voltage at a high level from the operation control unit is higher than the determination voltage, the output of the first voltage comparator circuit is changed to the high level,
When the input signal is supply voltage at a high level from the operation control unit is lower than the determination voltage, the output of the second voltage comparator circuit is changed to the high level,
When the input signal from the operation control unit is at the low level, the power supply to the constant-voltage circuit and the resistive divider circuit and the first voltage comparison circuit and the second voltage comparator circuit by the switch circuit It is stopped, the power supply voltage detection of claim 1, characterized in that to fix the output of the first voltage comparison circuit to a low level formed of a fixed output of the second voltage comparison circuit to a low level circuit.
JP2002083004A 2002-03-25 2002-03-25 Power supply voltage detection circuit Expired - Fee Related JP4115727B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002083004A JP4115727B2 (en) 2002-03-25 2002-03-25 Power supply voltage detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002083004A JP4115727B2 (en) 2002-03-25 2002-03-25 Power supply voltage detection circuit

Publications (3)

Publication Number Publication Date
JP2003279603A JP2003279603A (en) 2003-10-02
JP2003279603A5 true JP2003279603A5 (en) 2005-09-08
JP4115727B2 JP4115727B2 (en) 2008-07-09

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ID=29230968

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002083004A Expired - Fee Related JP4115727B2 (en) 2002-03-25 2002-03-25 Power supply voltage detection circuit

Country Status (1)

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JP (1) JP4115727B2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4441326B2 (en) * 2004-05-21 2010-03-31 ソニー株式会社 Voltage detection circuit
JP4671927B2 (en) * 2006-07-20 2011-04-20 パナソニック株式会社 Semiconductor device
JP4756701B2 (en) * 2006-12-13 2011-08-24 三洋電機株式会社 Power supply voltage detection circuit
JP5434896B2 (en) * 2010-12-20 2014-03-05 三菱電機株式会社 Low voltage protection circuit
JP5890964B2 (en) * 2011-03-30 2016-03-22 株式会社ケーヒン Battery voltage detector
JP2013084099A (en) * 2011-10-07 2013-05-09 Ricoh Co Ltd Low-voltage malfunction prevention circuit and method, and electronic equipment with low-voltage malfunction prevention circuit

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