控制器区域网络（CAN）基础

ControllerAreaNetwork(CAN)wasinitiallycreatedby

GermanautomotivesystemsupplierRobertBoschin

themid-1980sforautomotiveapplicationsasamethod

forenablingrobustserialcommunication.Thegoalwas

tomakeautomobilesmorereliable,safeandfuel-effi-

cientwhiledecreasingwiringharnessweightandcom-

plexity.Sinceitsinception,theCANprotocolhasgained

widespreadpopularityinindustrialautomationand

automotive/truckapplications.Othermarketswhere

networkedsolutionscanbringattractivebenefitslike

medicalequipment,testequipmentandmobile

machinesarealsostartingtoutilizethebenefitsofCAN.

Thegoalofthisapplicationnoteistoexplainsomeof

thebasicsofCANandshowthebenefitsofchoosing

CANforembeddedsystemsnetworkedapplications.AN713ControllerAreaNetwork(CAN)BasicsISO11898isastandardforhigh-speedapplications,Author:KeithPazulISO11519isastandardforlow-speedapplications,andMicrochipTechnologyInc.J1939(fromSAE)istargetedfortruckandbusapplica-tions.Allthreeoftheseprotocolsspecifya5Vdifferen-tialelectricalbusasthephysicalinterface.INTRODUCTIONTh