The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 16, 1997
Filed:
May. 29, 1996
Applicant:
Inventors:
Assignee:
Rohm Co., Ltd., Kyoto, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F / ;
U.S. Cl.
CPC ...
323282 ; 320 48 ;
Abstract
The improved device for detecting the end of battery life due to the depletion of battery power has a constant-voltage generator circuit that delivers a constant voltage until the voltage for use limit is reached. An A/D converter circuit performs A/D conversion on the constant voltage from the constant-voltage generator circuit in response to the operating power from a power supply line which decreases as the battery depletes. The device detects the end of battery life in response to the A/D converted value from the A/D converter circuit when the value of digital data obtained by conversion of the constant voltage has varied to exceed a specified level.