Patent · US Expired

CMOS low battery voltage detector

US6445305B2 · kind B2 · utility

4Cited by

10References

14Claims

0Family size

Assignee

Mitel Semiconductor AB · CA

Inventors

Olle Andersson · Järfälla, SE
Tony Ohlsson · Grillby, SE

Key dates

Filing date	Feb 1, 2001
Grant date	Sep 3, 2002
Priority date	—
Expiry date	Feb 1, 2021

Classification

Technology area (CPC G)Physics
CPC primaryG01R19/16552
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A system and method for detecting a low battery voltage supplied to a battery operated integrated circuit. A stable reference voltage provided by a bangap reference is compared with the battery voltage. A switched capacitor circuit is used instead of the more conventional resistor combination to supply a scaled representation of the battery voltage. Power requirements are reduced by combining the bandgap reference and the comparator into a single component.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.