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1、PCB设计检查标准PCBdesigninspectioncriteriaFirst,toensurethattheprintedcircuitboardnetworktableandschematicdescriptionofthenetworktableconsistentTwo,PCBlayoutisgenerallycompletedaftertheneedtocheckOutlinesizeMakesuretheprofileisuptodateConfirmthecontourdrawinghasconsideredthefo
2、rbiddenwiringarea,thetransmissionside,theblockingstrip,thepuzzleandsoonMakesurethePCBtemplateisuptodateComparativefigures,confirmthePCBmarkdimensionsandtolerancesarecorrect,nonmetallizedholeholemetallizationaccuratedefinitionVerifythattheprohibitedwiringareaontheoutliner
3、eflectsthelayoutonthePCBArethedigitalcircuitsandanalogcircuitsseparate,andisthesignalflowreasonable?Istheclockdevicelayoutreasonable?Isthelayoutofhighspeedsignaldevicesreasonable?Whethertheterminaldeviceisproperlyplaced(serialresistanceshouldbeplacedatthedriverendofthesi
4、gnal,andtheotherterminationmethodshouldbeplacedatthereceivingendofthesignal)IsthedecouplingcapacitorquantityandpositionoftheICdevicereasonable?Arethelayoutandrelativepositionsofprotectivedevices(suchasTVS,PTC)reasonable?AredevicesdesignedtoinfluencetheEMCexperiment,inacc
5、ordancewiththedesignguidelinesorrefereneesuccessfulexperience?・Forexample:theresetcircuitofthepanelshouldbealittleclosertotheresetbuttonHeaviercomponentsshouldbeplacednearthePCBsupportorsupportedgetoreducewarpageofthePCBHeatsensitivecomponents(includingliquiddielectricca
6、pacitor,crystaloscillator)asfarawayfromhigh-powercomponents,radiatorsandotherheatsourcesIsthedeviceheightconsistentwiththerequirementsfortheheightofthedevice?Inthe5mmrangearoundthecrimpingsocket,thecomponentsonthefacearenotallowedtoexceedtheheightofthecrimpsocket,andthec
7、omponentorsolderjointisnotallowedonthebackAxialmountingofhighercomponentsonthePCBshallconsiderhorizontalmounting・Leaveroomtoliedown.Andconsiderfixedmode,suchascrystalfixedweldingpadThemetalshellcomponents,specialattentionisnotwithothercomponentsorprintedwirecollide,tolea
8、veenoughspaceThemotherboardandthefender,asingleplateandabackplate,aconfirmationsignalcorrespondingcorre
