OnSemiNCV7381单路FlexRay总线驱动解决方案

OnSemiNCV7381单路FlexRay总线驱动解决方案OnSemi公司的NCV7381是单路FlexRay总线驱动器,和FlexRay电物理层指标Rev.3.0.1兼容,通信速度高达10Mbps,在有线的FlexRay通信中提供差分通信媒界,具有极好的EMC和ESD性能,工作温度−40°C到+125°C,符合汽车级质量标准.本文介绍了NCV7381主要特性,框图和应用框图,FlexRay总线驱动器应用电路图以及NCV7381APPV2评估板主要特性,框图,电路图,元件清单和PCB布局图.NCV7381isasingle−channelFlexRaybusdrivercompliantwiththeFlexRayElectricalPhysicalLayerSpecificationRev.3.0.1,capableofcommunicatingatspeedsofupto10Mbit/s.ItprovidesdifferentialtransmitandreceivecapabilitybetweenawiredFlexRaycommunicationmediumononesideandaprotocolcontrollerandahostontheotherside.NCV7381modecontrolfunctionalityisoptimizedfornodespermanentlyconnectedtocarbattery.ItoffersexcellentEMCandESDperformance.NCV7381主要特性:General•CompliantwithFlexRayElectricalPhysicalLayerSpecificationRev3.0.1•FlexRayTransmitterandReceiverinNormal−powerModesforCommunicationupto10Mbit/s•Supportof60nsBitTime•FlexRayLow−powerModeReceiverforRemoteWakeupDetection•ExcellentElectromagneticSusceptibility(EMS)LeveloverFullFrequencyRange.VeryLowElectromagneticEmissions(EME)•BusPinsProtectedagainst10kVSystemESDPulses•SafeBehaviorunderMissingSupplyorNoSupplyConditions•InterfacePinsforaProtocolControllerandaHost(TxD,RxD,TxEN,RxEN,STBN,BGE,EN,ERRN)•INHOutputforControlofExternalRegulators•LocalWakeupPinWAKE•TxENTime−out•BGEFeedback•SupplyPinsVBAT,VCC,VIOwithIndependentVoltageRampUp:♦VBATSupplyParametricalRangefrom5.5Vto50V♦VCCSupplyParametricalRangefrom4.75Vto5.25V♦VIOSupplyParametricalRangefrom2.3Vto5.25V•Compatiblewith14Vand28VSystems•OperatingAmbientTemperature−40°Cto+125°C(TAMB_Class1)•JunctionTemperatureMonitoringwithTwoLevels•SSOP−16PackageFlexRayFunctionalClasses•BusDriverVoltageRegulatorControl•BusDriver–BusGuardianInterface•BusDriverLogicLevelAdaptation•BusDriverRemoteWakeupQuality•AutomotiveQualificationAccordingtoAEC−Q100(Rev.F)图1.NCV7381框图图2.NCV7381应用框图图3.NCV7381FlexRay总线驱动器应用电路图NCV7381APPV2评估板BusDriver.ThefunctionalityandmajorparameterscanbeevaluatedwiththeNCV7381_APP_v2board.ThisdocumentdescribestheNCV7381APPV2EvaluationboardfortheONSemiconductorNCV7381FlexRaycommunicationmediumononesideandaprotocolcontrollerandahostontheotherside.ElectricalPhysicalLayerSpecificationRev.3.0.1,capableofcommunicatingatspeedsofupto10Mb/s.ItprovidesdifferentialtransmitandreceivecapabilitybetweenawiredFlexRaybusdrivercompliantwiththeFlexRayTheNCV7381isasingle-channelFlexRayNCV7381modecontrolfunctionalityisoptimizedfornodespermanentlyconnectedtocarbattery.node.Theboardisintendedtogivedesignerseasy,quickandconvenientmeansforevaluationofNCV7381FlexRaybusdrivers.Thedesignincorporatescompletenodesolutionwithpossibilityofmodificationsandsmallboardsize.AsetoftwoboardsallowsusersimmediatelystartwiththeNCV7381FlexRayBusDriver.TheMCUispreprogrammedwithafirmwarewhichprovidessimplemodecontrolandFlexRaycommunication.WithuseofFreescale[1]BDMprogrammerandasuitabledevelopmentenvironment,theMCUfirmwarecanbefreelymodifiedandreprogrammed.TheNCV7381_APP_V2Evaluationboardisareferencedesignforstand-alone2-channelFlexRay图4.NCV7381APPV2评估板外形图BoardHardwareTheboardconsistsofMCUwithintegrated2-channelFlexRaycommunicationcontrollerinterconnectedwithtwoseparateFlexRaybusdrivers(NCV7381),twoswitchablevoltageregulatorsandperipherals.TheboardispreparedforvariousmodificationsinpowersupplyconceptandFlexRaybustermination,andallowssimpleextensionofthesystembyunusedMCUpins.USBinterfaceprovidescompatibilitywithstandardPC.TheaddressofeachboardcanbeeasilymodifiedbyaddressswitchwhatallowscreatingcomplexFlexRaynetworkwithoutneedofreprogrammingtheMCU.ImplementedHighSpeedCANinterfacecanbeusedasadiagnosticinterfaceinanetworkbuiltfromseveralnodes.ForevaluationpurposesNCV7381ispopulatedwithseveralLEDdiodesandmostofthebusdriversignalsarecomfortableaccessibletooscilloscopeprobes.NCV73812037EVB评估板主要特性:FlexRayTransceiverChannelswithNCV7381BusDriverCompliantwiththeFlexRayElectricalPhysicalLayerSpecificationRev.3.0.1TwoSeparateFlexRayReconfigurableBusTermination–EndNode/MiddleNodeCommonModeChokeandAdditionalESDProtectionFootprintSUBD-9Connectors–FlexRaybusLocalWakeupSwitchMCUFreescale[1]16-bitMC9S12XFFamilyMCUIntegratedFlexRayCommunicationController(ProtocolSpecificationRev.2.1)IntegratedCAN2.0A,BControllerBackgroundDebugModul–Single-wireCommunicationwithHostDevelopmentSystem512kBFlash32kBRAM50MHzMaximumCPUBusFrequencyRelativelySmall112-pinLQFPPackagePeripheralsOpticalIsolatedUSBInterface(USBtoUARTConverter)AdditionalCANInterfaceAllNCV7381DigitalI/OPinsConnectedtoTestPoints–EasyConnectiontoLogicAnalyzer8GeneralPurposeLEDsAddressSwitchOtherTwoAutomotiveVoltageRegulatorswithInhibitFunction(InputBatteryVoltageUpto42V)PowerSuppliesVoltageMonitoringInstant2-nodesFlexRayNetworkwithRunningCommunicationbyConnectingTwoNCV7381EVBsPCConfigurationSoftwareunderDevelopment(AvailableuponRequest)PCBLayoutTheFlexRayTransceiver,theESDProtectionandtheCommonModeChokearePlacedneartotheFlexRaytheECUConnectorTheFlexRaySignalLines(BP,BM)areDecoupledfromDisturbancesontheECUBoardTheRoutingoftheFlexRayLines(BP,BM,TXandTXEN)isSymmetricTheDistance