简单锁定看门狗定时器

摘要：基于对μP-supervisor/watchdogIC（MAX6749），该电路在输入脉冲流的损失提供了一个锁定的失效指示。该电路可以监控风扇（根据风扇的转速输出），一个振荡器，或微处理器的软件执行。

Maxim>AppNotes>CircuitprotectionMicroprocessorsupervisorcircuitsKeywords:watchdogtimers,latchedwatchdogtimers,microprocessorsupervisorsJan05,2011APPLICATIONNOTE4558SimpleLatchingWatchdogTimerBy:EricSchlaepfer,ApplicationsEngineerAbstract:BasedonaP-supervisor/watchdogIC(MAX6749),thiscircuitprovidesalatchedfailureindicationinresponsetoalossoftheinputpulsestream.Thecircuitcanmonitorafan(basedonthefan'stachometeroutput),anoscillator,orthesoftwareexecutionofamicroprocessor.AsimilarversionofthisarticleappearedintheApril2007issueofPowerElectronicsTechnologymagazine.Mostwatchdog-timerICsproduceasingle,limited-durationoutputpulsewhenthewatchdogtime