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时间: 2019-12-24 22:34
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Abstract:Inmostelectronicsystems,itisimportanttomonitorsystemvoltagesbothtoensurethatprocessorsandotherICsremainresetduringpower-up,andtodetectwhenbrownoutconditionsoccur.Thismonitoringminimizescode-executionproblems,whichcorruptmemoryorcausesystemstoexecuteimproperly.Inhigh-endsystems,itisalsocriticaltoensurepropersequencingofthemanypowersupplieswithinthesesystems.Propersequencingpreventslatch-upconditions,whichcreatesystemproblemsordamageimportantcomponentssuchasmicrocontrollers(µCs),DSPs,ASICs,ormicroprocessors(µPs).Commonly,oneormoresupervisoryproductsareneededtoimplementthepropersequencingandmonitoringfunctionsnotedhere.Asthenumberofvoltagescontinuetoincrease,thenumberofindependentsupervisoryICsalsomayincrease.Inadditiontothenumberofdiscretecomponents,thelevelofcomplexityalsoincreaseasanychangestothesequencingorder,delaytiming,orthemonitoredthresholdslevelsrequiressignificantchanges.AdditionalinformationisalsorequiredsuchasexactvoltagemeasurementsfromanADCisalsooftenusefulinimprovingreliabilityinthesehighendcomplexsystems.NewprogrammablesystemmanagementICssuchastheeepromconfigurableMAX6870/MAX6871providesafullyintegratedsolutionsthatofferthislevelofflexibility.System-them),oneregulatorwillthencomeupaftertheother,oncethePOR’stimedelayhaselapsed.managementICAsthenumberofsystemsupplyvoltagesincreases,voltagemonitorsandsupervisorsthatmonitormultiplemeetsmonitoringvoltagesbecomenecessary.However,becauseitiscommonfortentofifteenvoltagestopoweracomplexandsequencingsystem,severalsuchde……