ApplicationReportSPRAAS1A–August2008HardwareDesignGuidelinesforTMS320F28xxandTMS320F28xxxDSCsPradeepShinde...............................................................................................................................ABSTRACTTMS320F28xxandF28xxxdigitalsignalcontrollers(DSCs)includemultiplecomplexperipheralsrunningatfairlyhigh-clockfrequencies.Theyarecommonlyconnectedtolowlevelanalogsignalsusinganonboardanalog-to-digitalconverter(ADC).Thisapplicationreportisorganizedasaguideforsystemlevelhardwaredesign,partsselection,andschematicsdesigntoboardlayoutandhelpsinavoidingthosehardwareerrorsthatbecomecostlyandtimeconsumingwhendetectedduringthesystemlevel-debuggingphaseoftheproject,usingtheprototypeofthecustomboardoftheproject.Theissuesrelatedtoclockgeneration,JTAG,powersupply,interfacingofperipheralswithspecialattentiontoanaloginputstoADC,general-purposeinput/output(GPIO)connections,testinganddebug,electromagneticinterference(EMI)andelectromagneticcompatibility(EMC)considerations,etc.,arediscussed.Eachsectionexplainssignalroutingandlayouttips.Contents1Introduction..........................................................................................22TypicalSystemandChallenges..................................................................23HandlingofDifferentHardwareBuildingBlocks................................................44SchematicsandBoardLayoutDesign.........................................................235EMI/EMCandESDConsiderations.............................................................276Conclusion.........................................................................................297References.........................................................................................30ListofFigures1TypicalTMS320F28xx/28xxxSystem............................................................32OptionsforClockInput............................................................................43TypicalCrystalCircuit........................
