Implementing Nonvolatile, Nonresettable Counters for Embedded Systems

Abstract:Forwarrantyreasonsitisdesirabletocountcertaineventssuchaspowercycles,operatingtime,hard(pushbutton)resets,andtimeouts.Althoughdigitalcountersareeasytobuild,itisnotthatobvioushowtomakethemnonvolatileandnonresettable.ThisarticleexplainshowtousetheEPROM-emulationmodeofreadilyavailableserialEEPROMstogetherwithanunusualcodingschemetosolvetheproblem.Maxim>Designsupport>Appnotes>1-WireDevices>APP5042Maxim>Designsupport>Appnotes>Memory>APP5042Keywords:digitalcounter,nonvolatile,nonresettable,NV,EPROMemulationmode,EEPROM,EPROM,eeprom,epromJun08,2011APPLICATIONNOTE5042ImplementingNonvolatile,NonresettableCountersforEmbeddedSystemsBy:BernhardLinke,PrincipalMemberTechnicalStaffAbstract:Forwarrantyreasonsitisdesirabletocountcertaineventssuchaspowercycles,operatingtime,hard(pushbutton)resets,andtimeouts.Althoughdigitalcountersareeasytobuild,itisnotthatobvioushowtomakethemnonvolatileandnonresettable.Thisarticleexplain