Patent · US Expired

Monitoring circuit for resetting malfunctioning electronic components, such as microprocessors

US4512019A · kind A · utility

11Cited by

7References

9Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Bernd Bodig · Leinfelden, DE
Gerd Hohne · Ludwigsburg, DE
Helmut Schmied · Erbach, DE

Key dates

Filing date	Sep 30, 1982
Grant date	Apr 16, 1985
Priority date	—
Expiry date	Sep 30, 2002

Classification

Technology area (CPC G)Physics
CPC primaryG06F11/0757
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

A capacitor which is charged by recurring square waves of a normally functioning microprocessor discharges at a steady rate, so that if the square waves do not continue, an operational amplifier will switch over and produce a reset pulse for the microprocessor. Repeated transitions of one polarity of the square wave recharge the capacitor during a short interval terminated by a second operational amplifier when the capacitor reaches a fixed level of charge. This second amplifier, which has feedback coupling, also initiates the timing discharge of the capacitor. A diode network at its output prevents charging the capacitor in the static state. This arrangement makes it unnecessary to provide another capacitor for quickly recharging the capacitor to prevent its discharge from switching over the first-mentioned operational amplifier.

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