JPS5752882A - Power source circuit - Google Patents

Power source circuit

Info

Publication number
JPS5752882A
JPS5752882A JP55128990A JP12899080A JPS5752882A JP S5752882 A JPS5752882 A JP S5752882A JP 55128990 A JP55128990 A JP 55128990A JP 12899080 A JP12899080 A JP 12899080A JP S5752882 A JPS5752882 A JP S5752882A
Authority
JP
Japan
Prior art keywords
cell
power source
lithium cell
capacitor
vee
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
Application number
JP55128990A
Other languages
Japanese (ja)
Inventor
Keizo Yamamoto
Shigemi Imai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
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 by Sharp Corp filed Critical Sharp Corp
Priority to JP55128990A priority Critical patent/JPS5752882A/en
Publication of JPS5752882A publication Critical patent/JPS5752882A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G19/00—Electric power supply circuits specially adapted for use in electronic time-pieces
    • G04G19/02—Conversion or regulation of current or voltage
    • G04G19/06—Regulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

PURPOSE:To enable the use of either a 1.5V oxidized silver cell and a 3.0V lithium cell, by a method wherein a power source circuit in LSI is switched to either of a step-up circuit and a step-down circuit through the changing of connection of a cell and capacitor. CONSTITUTION:In case a lithium cell Li is used, the lithium cell Li is connected to the intermediate of VDD-VEE, and capacitors C1 and C2 are connected to the intermediates of VDD-VEE and DDC-Vc, respectively. MOS transistors Tr1-Tr4 switch the capacitors C1 and C2 to series and parallel, and the voltage of the lithium cell Li, which is reduced to 1/2, is obtained at a VSS terminal. In case an oxidized silver cell Ag2O is used, the cell and the capacitor C1 and C2 are connected as shown in Fig, and the voltage, which is stepped up to 2 times the cell voltage of the oxidized silver cell, is produced from the VEE terminal. In case the lithium cell is used, a transistor Tr5 forces the capacitor C1 to be charged, and this prevents a whole system from no working at a time when a power source is turned ON.
JP55128990A 1980-09-16 1980-09-16 Power source circuit Pending JPS5752882A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55128990A JPS5752882A (en) 1980-09-16 1980-09-16 Power source circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55128990A JPS5752882A (en) 1980-09-16 1980-09-16 Power source circuit

Publications (1)

Publication Number Publication Date
JPS5752882A true JPS5752882A (en) 1982-03-29

Family

ID=14998390

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55128990A Pending JPS5752882A (en) 1980-09-16 1980-09-16 Power source circuit

Country Status (1)

Country Link
JP (1) JPS5752882A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4950077A (en) * 1988-04-28 1990-08-21 Olympus Optical Co., Ltd. Photoelectric measuring apparatus for use in automatic analyzer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4950077A (en) * 1988-04-28 1990-08-21 Olympus Optical Co., Ltd. Photoelectric measuring apparatus for use in automatic analyzer

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