基于功能安全的芯片设计

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1、DesignofMicrocontrollersforSafetyCriticalOperationKarlGrebandAnthonySeelyMicrocontrollerTexasInstrumentsAgenda
Introductiontofunctionalsafety
IEC61508standard
PreviewofISO26262standard
Functionalsafetylessonslearned
SummaryandclosingthoughtsIntroductiontoFu

2、nctionalSafetyWhatisFunctionalSafety?
IEC61508Definition:
Safetyisthefreedomfromunacceptableriskofphysicalinjuryorofdamagetothehealthofpeople,eitherdirectly,orindirectlyasaresultofdamagetopropertyortotheenvironment.
FunctionalSafetyispartoftheoverallsafetyt

3、hatdependsonasystemorequipmentoperatingcorrectlyinresponsetoitsinputs.
ISO26262Definition:
Absenceofunacceptableriskduetohazardscausedbymal-functionalbehaviorofelectricaland/orelectronicsystemsStateoftheIndustry
TIhasbeenshippingmicrocontrollersintoautomoti

4、vesafetycriticalproductsforover20years.
Startingin2006,majorshiftincustomerrequirementsinautomotivesafetyapplications
Increasedawarenessoffunctionalsafetystandards
RequirementstosupportcustomerassessmentofsystemsincorporatingTIproduct
Requirementsfordevelop

5、mentofnewproductsinflowscomplianttoIEC61508andlaterISO26262.
Thistrendcontinuestodayinautomotive
ApplicationoffunctionalsafetytechniquesmovingfromsystemlevelcomponentlevelIPcomponentlevel
Systemlevelsafetymeasuresarebeingimplementedon-chipaswemovetomoreco

6、mplexsystemonchipdevices.FunctionalSafetyBasicConcepts
Allsystemswillhavesomeinherent,quantifiablefailurerate.Itisnotpossibletodevelopasystemwithzerofailurerate.
Foreachapplication,thereissometolerablefailureratewhichdoesnotleadtounacceptablerisk.
Acceptabl

7、efailureratesvaryperapplication,basedonthepotentialfordirectorindirectphysicalinjuryintheeventofsystemmalfunction.
Categoriescanbedevelopedtoquantifysimilarlevelsofrisk.TheseareknownasSafetyIntegrityLevels,orSILs.SafetyFailuresandtheirCauses
Failuresinafunc

8、tionalsafetysystemcanbebroadlyclassifiedintotwocategories:systematicandrandomfailures
SystematicFailures
Resultfromafailureindesignormanufacturing
Oftenaresultoffailuretofollowbestpractices
Rateofsyste