上海贝尔pcb 设计规范（shanghai baer pcb design specification）

上海贝尔PCB设计规范（SHANGHAIBAERPCBDESIGNSPECIFICATION）PCBDESIGNSPECIFICATIONDISCUSSIONPAPERVERSIONED,DATEWRITING,SIGNATUREAUDIT,SIGNATUREAPPROVALSIGNATURE022001619SHANGHAIBELLFILENAMEPCBDESIGNSPECIFICATIONTHEFILENUMBERISFIRSTPAGES,32PAGESALTOGETHERCATALOGAPCBDESIGNLAYOUTSPECIFICATIONTHELAYOUTDESIGNPRINCIPLESINTWOOFTHEREQUIREMENTSOFLAYOUTDESIGNANDPROCESSPCBDESIGNSPECIFICATIONWIRINGTHEWIRINGDESIGNPRINCIPLESINPROCESSFORTHEWIRINGDESIGNREQUIREMENTSANDTHREETHEDESIGNOFPCBPOSTPROCESSINGSPECIFICATIONTHETESTPOINTADDINMARKPCBBOARDPROCESSINGDATAFILEGENERATIONFOURGLOSSARYTHEHOLEHOLE,HOLEHOLE,HOLES,SHAPEDHOLE,HOLEASSEMBLYTHEPOSITIONINGHOLEANDOPTICALPOSITIONINGPOINTNEGATIVENEGATIVEANDPOSITIVEPOSITIVEREFLOWSOLDERINGREFLOWANDWAVESOLDERINGWAVESOLDERPCBANDPBA3THREEFOURFIFTEENFIFTEENSIXTEENTWENTYFOURTWENTYFOURTWENTYFIVETWENTYNINETHIRTYONETHIRTYONETHIRTYONETHIRTYONETHIRTYONETHIRTYTWOVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONSECONDPAGES,ATOTALOF32PAGESLAYOUTSPECIFICATIONFORAPCBDESIGN1LAYOUTDESIGNPRINCIPLES1,THEDISTANCEFROMTHEEDGEOFTHEPLATESHOULDBEGREATERTHAN5MM2PLACETHEELEMENTSCLOSELYRELATEDTOTHESTRUCTURE,SUCHASCONNECTORS,SWITCHES,POWERSOCKETS,ETCTHE3PRIORITYISTOPUTTHECORECOMPONENTSOFTHECIRCUITFUNCTIONBLOCKSANDTHELARGERCOMPONENTS,ANDTHENTOTHECORECOMPONENTSFORCENTERPUTCIRCUITCOMPONENTSAROUND4,LARGEPOWERCOMPONENTSPLACEDINFAVOROFHEATDISSIPATIONPOSITION,SUCHASTHEUSEOFFANCOOLING,PLACEDINTHEAIRTHEMAINCHANNELIFTHECONDUCTIONHEATDISSIPATION,SHOULDBEPLACEDCLOSETOTHECHASSISGUIDESLOTPOSITION5THEQUALITYOFTHELARGERCOMPONENTSSHOULDBEAVOIDEDATTHECENTEROFTHEPLATE,SHOULDBECLOSETOTHEPLATEINTHEBOXINTHEFIXEDEDGETHE6COMPONENTSWITHHIGHFREQUENCYCONNECTIONSAREASCLOSEASPOSSIBLETOREDUCETHEDISTRIBUTIONPARAMETERSOFHIGHFREQUENCYSIGNALSANDELECTROMAGNETICDRYDISTURBANCE7INPUTANDOUTPUTCOMPONENTSASFARAWAYASPOSSIBLE8,WITHHIGHVOLTAGECOMPONENTSSHOULDBEPLACEDASFARASPOSSIBLEINTHEHANDSOFDEBUGGINGDIFFICULTTOTOUCH9THEHEATSENSITIVEELEMENTSHALLBEAWAYFROMTHEHEATINGELEMENT10THELAYOUTOFTHEADJUSTABLEELEMENTSSHOULDBEEASILYADJUSTEDSUCHASJUMPER,VARIABLECAPACITOR,POTENTIOMETERANDSOON11CONSIDERTHEFLOWDIRECTIONANDARRANGETHELAYOUTPROPERLYSOTHATTHESIGNALFLOWCANBECONSISTENTASMUCHASPOSSIBLE12,THELAYOUTSHOULDBEUNIFORM,NEATANDCOMPACT13,THELAYOUTOFTHECOMPONENTSSHOULDPAYATTENTIONTOTHEDIRECTIONOFTHEWELDINGPADASMUCHASPOSSIBLE,INORDERTOFACILITATEWELDING,REDUCINGTHEBRIDGEPROBABLY。14DECOUPLINGCAPACITORSSHOULDBEPLACEDNEARTHEPOWERINPUTVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONTHIRDPAGES,ATOTALOF32PAGESTWOPROCESSREQUIREMENTSFORLAYOUTDESIGNWHENSTARTINGANEWPCBDESIGN,ACCORDINGTOTHEDESIGNPROCESS,WEMUSTCONSIDERTHEFOLLOWINGRULES1,ESTABLISHABASICPCBDRAWINGREQUIREMENTSANDRULESSCHEMATICALLYASSHOWNTHEBASICPCBSHOULDCONTAINTHEFOLLOWINGINFORMATION1PCBSIZE,FRAME,ANDROUTINGAREATHESIZEOFTHEAPCBSHALLBESTRICTLYINACCORDANCEWITHTHEREQUIREMENTSOFTHESTRUCTURENOTETHEMULTILAYERPCBPRODUCEDBYBAERPRODUCTIONDEPARTMENTIS51308MM4545MMATPRESENTWHENDESIGNINGDOUBLEORFOURLAYERSBACKPLANE,THESIZEOFBACKBOARDSHOULDBELESSTHAN503MM404MMBPCBSBOARDOUTLINEISUSUALLYDRAWNWITH10MILLINESCTHEDISTANCEFROMTHEROUTINGPANELTOTHEEDGESHALLBEGREATERTHAN5MMVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONFOURTHPAGES,ATOTALOF32PAGES2THESTACKEDEDGEOFTHEPCBPLATEABASEDONPROCESSINGCONSIDERATIONSASSHOWNBELOWISTHEEXAMPLEOFFOURLAYERSOFPCB,ANDTHEFIRSTISRECOMMENDATIONMETHODFORTHESIXLAYERSOFPCB,THEARRANGEMENTOFLAYERSISSHOWNBELOWFORMORELAYERSOFPCB,THENANALOGIESBSTACKARRANGEMENTBASEDONELECTRICALCHARACTERISTICSVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONFIFTHPAGES,ATOTALOF32PAGESINTHEDESIGNOFMULTIPLATE,THESTRATUMANDPOWERLAYERSHOULDBEUSEDASFARASPOSSIBLETOSEPARATETHESIGNALLAYERFROMEACHOTHERTHEDIRECTIONOFTHEADJACENTSIGNALLAYERSHOULDBEORTHOGONALTHEFOLLOWINGTABLESHOWSTHEARRANGEMENTOFTHE14PLATESTHEFOLLOWINGFIGUREISASTACKOF10LAYERSOFTHEPROPOSEDPCB,ANDTHEPCBOFTHEOTHERLAYERSINTURN3MECHANICALPOSITIONINGHOLESFORPCBANDOPTICALPOSITIONINGPOINTSFORSMCAMECHANICALPOSITIONINGHOLESFORPCBSHALLCOMPLYWITHTHEFOLLOWINGRULESREQUIREMENTSMECHANICALPOSITIONINGHOLESIZEREQUIREMENTSTHESIZEOFTHEMECHANICALPOSITIONINGHOLEFORTHEPCBPLATEMUSTBESTANDARDSEECHARTANDBELOW,IFNECESSARYKNOWLEDGEOFPRODUCTIONMANAGER,THEFOLLOWINGUNITSFORMMVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONSIXTHPAGES,ATOTALOF32PAGESLOCATIONOFBMECHANICALPOSITIONINGHOLETHELOCATIONOFTHEMECHANICALPOSITIONINGHOLEISINTHEDIAGONALPOSITIONOFTHEPCB,ASSHOWNINFIG“FORTHEAVERAGEPB,BAERRECOMMENDEDPRODUCTIONDEPARTMENTMECHANICALPOSITIONINGHOLEDIAMETERIS3MM,MECHANICALTHEDISTANCEBETWEENTHECENTEROFTHEBITHOLEANDTHEEDGEOFTHEPLATEIS508MMCOMPONENTSFOREDGEOBJECTS,CONNECTORS,MECHANICALPOSITIONINGHOLESWILLBEMOVINGINTHEXDIRECTION,THEDIAMETEROFTHEMECHANICALPOSITIONINGHOLEISRECOMMENDEDAS3MMMECHANICALPOSITIONINGHOLESFORTHEHOLEHOLEVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONSEVENTHPAGES,ATOTALOF32PAGESCTHEOPTICALPOSITIONINGPOINTSFORTHESMCOFTHEPCBBOARDSHALLFOLLOWTHEFOLLOWINGRULESOPTICALPOSITIONINGPOINTPCBPLATEINORDERTOMEETTHENEEDSOFAUTOMATEDPRODUCTIONPROCESSINGOFSMC,ITMUSTBEADDEDTOTHESURFACEANDBOTTOMOFPCBADDOPTICALPOSITIONINGPOINTS,SEEBELOWNOTE1FROMTHEPLATEEDGEANDMECHANICALPOSITIONINGHOLEDISTANCEISGREATERTHANOREQUALTO75MM2THEYMUSTHAVETHESAMEXORYCOORDINATES3THEOPTICALPOSITIONINGPOINTMUSTBEWELDED4THEREAREATLEAST2OPTICALPOSITIONINGPOINTSANDPLACEDDIAGONALLY5THESIZEOFTHEOPTICALPOSITIONINGPOINTISSHOWNBELOW6THEYARESURFACEPADSPLACEDATTHETOPANDBOTTOMVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONEIGHTHPAGES,ATOTALOF32PAGESBAERPRODUCTIONRECOMMENDEDUSUALLYOPTICALPOSITIONINGSPOTDIAMETERPD,16MM63MIL,RESISTANCEWELDINGDIAMETERDSR32MM126MILWHENPBDENSITYANDACCURACYREQUIREMENTSAREVERYHIGH,THEOPTICALPOSITIONINGSPOTPLATECANBE10MMWHICHMUSTBENOTIFIEDTOTHEPRODUCTIONMANAGER,ANDTHEPADNEEDSTOBEFITTEDWITHASTOPWELDINGPCBPLATESURFACEMOUNTCOMPONENTSREFERENCEPOINT1WHENTHECOMPONENTSMCPINCENTERDISTANCELEAD,PITCH06MMMUSTBEADDAREFERENCEPOINTANDPLACEITONTHECORNEROFTHECOMPONENTSEEBELOWTHEREFERENCEPOINTCANONLYBE2,THEREFERENCEPOINTSHOULDBEPLACEDDIAGONALLY,ANDTHEREFERENCEPOINTMUSTBEVISIBLEAFTERTHEELEMENTISPLACED2BGAMUSTINCREASETHEREFERENCEPOINTWITHTHEPICTUREABOVE3ONAVERYDENSEBOARD,ANDWITHOUTTHEPOINTOFREFERENCEFORSPACEPLACEDELEMENTS,THENINTHESUMOFWIDEAREAISLESSTHANOREQUALTO100MM,CANONLYPUTTWOCOMMONREFERENCEPOINTS,ASSHOWNBELOWVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONNINTHPAGES,ATOTALOF32PAGESBAERRECOMMENDEDPRODUCTIONDEPARTMENTPINCENTERDISTANCELEADPITCH06MMORSOCANNOTCTHELOCATIONOFTHEPIECE,ANDTHEREFERENCEPOINTMUSTBEADDED4THEREFERENCEPOINTOFTHEELEMENTISTHESAMEASTHETYPEOFTHEOPTICALPOSITIONINGPOINTOFTHEPCBBOARDSEETHEPADSIZEPCBPLATESOPTICALPOSITIONINGPOINTREQUIREMENTSFORLAYOUTPLACEMENTOF2PCBCOMPONENTSTHELAYOUTRULESOFPCBCOMPONENTSSHOULDBESTRICTLYREFERREDTO1,ANDTHESPECIFICREQUIREMENTSAREASFOLLOWS1THEORIENTATIONOFTHEELEMENTSORIENTATIONTHEORIENTATIONOFTHEACOMPONENTSHALLBEUNIFIEDASMUCHASPOSSIBLEAFTERCONSIDERINGTHEREQUIREMENTSOFWIRING,ASSEMBLY,WELDINGANDMAINTENANCETHECOMPONENTSONTHEPBAAREREQUIREDTOHAVEAUNIFIEDDIRECTION,ANDTHECOMPONENTSWITHPOSITIVEANDNEGATIVEPOLESAREALSOREQUIREDTHEREISAUNIFIEDDIRECTIONBFORWAVESOLDERINGPROCESS,COMPONENTPLACEMENTDIRECTIONREQUIREMENTSSUCHASVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONTENTHPAGES,ATOTALOF32PAGESBECAUSEOFTHESHADOWEFFECTOFTHEWAVESOLDERING,THECOMPONENTDIRECTIONIS90DEGREESTOTHEWELDINGDIRECTION,ANDTHEWAVESOLDERINGSURFACEELEMENTTHEHEIGHTLIMITIS4MMCFORTHEHOTAIRREFLOWPROCESS,THEDIRECTIONOFTHECOMPONENTPLACEMENTHASLITTLEEFFECTONWELDINGDFORBOTHSIDESHAVECOMPONENTSOFTHEPCB,LARGERANDMOREDENSEIC,SUCHASQFP,BGAANDOTHERPACKAGESTHECOMPONENTSAREPLACEDONTHETOPOFTHEBOARD,ANDTHEPLUGINCOMPONENTSCANONLYBEPLACEDONTHETOPLAYERONESIDEBOTTOMCANONLYPLACESMALLERCOMPONENTSANDFEWERPINSANDLOOSELYARRANGEDPATCHESCOMPONENTS,CYLINDRICALSURFACEMOUNTDEVICESSHOULDBEPLACEDONTHEBOTTOMLAYEREINORDERTOVACUUMFIXTURESTRUCTURE,THEHIGHESTCOMPONENTOFTHEBACKOFTHEBOARDCANNOTEXCEED55MMIFTHESTANDARDNEEDLEPRESSURETESTFIXTUREISUSED,THECOMPONENTONTHEBACKOFTHEBOARDSHALLNOTEXCEEDTHEMAXIMUM10MMFCONSIDERTHEACTUALWORKENVIRONMENTANDITSOWNHEATING,ETC,COMPONENTSSHOULDBEPLACEDTOCONSIDERTHEREASONSFORHEATDISSIPATIONSUVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONELEVENTHPAGES,ATOTALOF32PAGESNOTE1THEARRANGEMENTOFCOMPONENTSSHALLBECONDUCIVETOHEATDISSIPATIONAND,IFNECESSARY,TOFANSANDRADIATORSSMALL,HIGHHEATCOMPONENTSPLUSRADIATORSAREESPECIALLYIMPORTANT2LARGEPOWERMOSFETANDOTHERCOMPONENTSCANBEAPPLIEDTODISSIPATEHEATBYCOPPER,ANDALSOINTHESEELEMENTSTRYNOTTOHEATTHESENSINGELEMENTSAROUNDTHEPIECEIFTHEPOWERISPARTICULARLYLARGE,THEHEATISPARTICULARLYHIGH,HEATSINKCANBEADDEDTODISSIPATEHEAT2PCBLAYOUTCONSIDERATIONSFORELECTRICALSIGNALSFORADESIGNERTOCONSIDERTHEDISTRIBUTIONOFPCBCOMPONENTS,CONSIDERTHEFOLLOWINGDIAGRAMVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONTWELFTHPAGES,ATOTALOF32PAGESAHIGHSPEEDCOMPONENTSANDEXTERNALINTERFACESSHOULDBEASCLOSETOTHECONNECTORASPOSSIBLEBDIGITALCIRCUITSANDANALOGCIRCUITSSHOULDBESEPARATEDASFARASPOSSIBLE,PREFERABLYSEPARATEDFROMTHEGROUND3THEDISTANCEBETWEENTHEELEMENTANDTHELOCATINGHOLETHEDISTANCEFROMTHEAPOSITIONINGHOLETOTHEVICINITYOFTHEPADISNOLESSTHAN762MM300MILTHEDISTANCEFROMTHEBPOSITIONINGHOLETOTHEEDGEOFTHESURFACEMOUNTDEVICEISNOTLESSTHAN508MM200MILVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONTHIRTEENTHPAGES,ATOTALOF32PAGESFORTHESMDELEMENT,THEMINIMUMRADIUSOFTHESMDELEMENTOUTERFRAMEIS508MM200MILFROMTHECENTEROFTHELOCATINGHOLE4REQUIREMENTSFORDIPAUTOMATICPLUGINMACHINESONTHEPBWITHBOTHSMDANDDIPCOMPONENTS,TOAVOIDDAMAGETOTHEDIPELEMENTDURINGAUTOMATICINSERTIONTHESMDCOMPONENTMUSTCONSIDERTHELAYOUTREQUIREMENTSOFTHESMDANDDIPCOMPONENTSINTHELAYOUTVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONFOURTEENTHPAGES,ATOTALOF32PAGESWIRINGSPECIFICATIONFORTWOPCBDESIGN1CABLINGDESIGNPRINCIPLES1LINESSHOULDAVOIDSHARPANGLESANDRIGHTANGLESADOPT45DEGREEROUTINGTHESIGNALLINESOF2ADJACENTLAYERSAREORTHOGONAL3HIGHFREQUENCYSIGNALASSHORTASPOSSIBLE4,INPUTANDOUTPUTSIGNALSASMUCHASPOSSIBLETOAVOIDADJACENTPARALLELLINE,THEBESTLINEBETWEENTHEGROUNDWIRE,INCASEOFFEEDBACKCOUPLING5THEPOWERSUPPLYLINEANDGROUNDWIREOFDOUBLESIDEDBOARDAREBESTCONSISTENTWITHTHEDATAFLOWSOASTOENHANCETHEANTINOISECAPABILITY6DIGITAL,ANALOGTOSEPARATE,LOWFREQUENCYCIRCUIT,THEGROUNDSHOULDTRYTOUSEASINGLEPOINTPARALLELGROUNDINGHIGHMULTIFREQUENCYSERIESGROUNDINGISPREFERREDFORFREQUENCYCIRCUITSFORDIGITALCIRCUITS,THEGROUNDWIRESHOULDBECLOSEDTOTHECOMPOSITELOOPFORLIFTINGHIGHNOISEIMMUNITY7,FORTHECLOCKLINEANDHIGHFREQUENCYSIGNALLINE,ACCORDINGTOITSCHARACTERISTICIMPEDANCEREQUIREMENTSTOCONSIDERTHEWIDTHOFTHELINE,SOASTOACHIEVEIMPEDANCEMATCHINGWITH8,THEWHOLECIRCUITBOARDWIRING,DRILLINGMUSTBEUNIFORM,TOAVOIDOBVIOUSDENSITYUNEVENSITUATIONWHENPRINTINGWHENTHEOUTERSIGNALOFTHEBOARDHASLARGEBLANKAREAS,AUXILIARYWIRESSHALLBEADDEDTOMAKETHEMETALDISTRIBUTIONONTHEPANELSURFACEBASICALLYBALANCEVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONFIFTEENTHPAGES,ATOTALOF32PAGESTWOPROCESSREQUIREMENTSFORWIRINGDESIGN1USUALLYTHEROUTINGWIDTHANDPASSSIZEWEUSUALLYUSEINROUTINGNOTETHEVIASATTHEBOTTOMOFTHEBGAPACKAGEAREREQUIREDTOBEINTHEPOSITIVEANDREVERSETWOASREQUIREDBYTHEMACHININGPROCESSTHESURFACEISCOVEREDWITHABARRIERLAYER1WHENTHELINEWIDTHIS03MMSPACINGWIRE,PAD,VIASLINE03MM03MMSURFACELAYER028MMINNERLAYER03MMSURFACELAYER028MMINNERLAYERPAD03MM03MMTHROUGHHOLE03MM2WHENTHELINEWIDTHIS02MMSPACINGMMWIREPADVIASLINE02MM,02MM,02MMPAD02MM02MMTHROUGHHOLE022MM3WHENTHELINEWIDTHIS015MMSPACINGWIRE,PAD,VIASLINE015MM,015MM,015MMPAD02MM02MMTHROUGHHOLE022MMVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONSIXTEENTHPAGES,ATOTALOF32PAGES4WHENTHELINEWIDTHIS012MMSPACINGWIRE,PAD,VIASLINE012MM,012MM,012MMPAD02MM02MMTHROUGHHOLE022MMITISALSOWORTHNOTINGTHATTHEGAPBETWEENTHEPADSANDPADSBELOWTHEBGAISALSOLINEWIDTHANDBECAUSETHELINEWIDTHOF012MMISNOTRECOMMENDEDFORTECHNICALDIFFICULTIESWIDTHOFTHROUGHHOLEPADCORRESPONDINGLINEWIDTHINNERSURFACEPORESIZEAFTERPOREFORMING03MM120MM129MMISLESSTHANOREQUALTO06002MM085MM090MMLESSTHANOREQUALTO040BGAISLESSTHANOREQUALTO030015MM065MM070MMISLESSTHANOREQUALTO030012MM064MM064T0305WHENTHELINEWIDTHISLESSTHANOREQUALTO012MM,AHOLEPADWITHTEARSINTHETABLEREPRESENTSTTEARSNEEDTOBEADDEDWHENTHESIZEOFTHEBOARDISGREATERTHAN600MM,THEWIDTHOFTHEPADACROSSTHEHOLENEEDSTOBEINCREASED01MMTABLEUNITMMVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONSEVENTEENTHPAGES,ATOTALOF32PAGESWALKTHELINEWIDTHSIZEOFSTANDARDWELDINGPADISOLATIONBELTINSULATIONLANDSIZEOFSOLDERSTOPWINDOWTHESIZEOFTHEINNERSURFACEAREAPADRINGWIDTHPADDIAMETERPADRINGWIDTHPADDIAMETERWIDTHRESISTANCEWELDINGINCREMENTZEROPOINTTHREEZEROZEROPOINTEIGHTZEROPOINTNINEFIVEONEPOINTZEROFIVEONEPOINTTWOONEPOINTFOURONEPOINTSIXZEROPOINTFIVESEVENONEPOINTTHREESEVENONEPOINTFIVETWOONEPOINTSIXTWOONEPOINTSEVENSEVENONEPOINTNINESEVENTWOPOINTONESEVENZEROPOINTSEVENTHREEONEPOINTFIVETHREEONEPOINTSIXEIGHTONEPOINTSEVENEIGHTONEPOINTNINETHREETWOPOINTONETHREETWOPOINTTHREETHREEONEPOINTTWONINETWOPOINTZERONINETWOPOINTTWOFOURTWOPOINTTHREEFOURTWOPOINTFOURNINETWOPOINTSIXNINETWOPOINTEIGHTNINEZEROPOINTTWOONEPOINTFIVESEVENONEPOINTSEVENTWOONEPOINTEIGHTTWOONEPOINTNINESEVENTWOPOINTONESEVENTWOPOINTTHREESEVENZEROPOINTTWOZEROPOINTEIGHTZEROPOINTNINEONEPOINTZEROFIVEONEPOINTTWOONEPOINTFOURONEPOINTSIXZEROPOINTFIVESEVENONEPOINTTHREESEVENONEPOINTFOURSEVENONEPOINTSIXTWOONEPOINTSEVENSEVENONEPOINTNINESEVENTWOPOINTONESEVENZEROPOINTSEVENTHREEONEPOINTFIVETHREEONEPOINTSIXTHREEONEPOINTSEVENEIGHTONEPOINTNINETHREETWOPOINTONETHREETWOPOINTTHREETHREEONEPOINTZEROTHREEONEPOINTEIGHTTHREEONEPOINTNINETHREETWOPOINTZEROEIGHTTWOPOINTTWOTHREETWOPOINTFOURTHREETWOPOINTSIXTHREEZEROPOINTONEFIVEONEPOINTFIVETWOONEPOINTSIXTWOONEPOINTSEVENSEVENONEPOINTNINETWOTWOPOINTONETWOTWOPOINTTHREETWOZEROPOINTONEFIVEZEROPOINTEIGHTZEROPOINTNINEONEPOINTZEROFIVEONEPOINTTWOONEPOINTFOURONEPOINTSIXZEROPOINTFIVESEVENONEPOINTTHREESEVENONEPOINTFOURSEVENONEPOINTSIXTWOONEPOINTSEVENSEVENONEPOINTNINESEVENTWOPOINTONESEVENZEROPOINTSIXSEVENONEPOINTFOURSEVENONEPOINTFIVESEVENONEPOINTSEVENTWOONEPOINTEIGHTSEVENTWOPOINTZEROSEVENTWOPOINTTWOSEVENZEROPOINTNINESEVENONEPOINTSEVENSEVENONEPOINTEIGHTSEVENTWOPOINTZEROTWOTWOPOINTONESEVENTWOPOINTTHREESEVENTWOPOINTFIVESEVENZEROPOINTONEFIVEONEPOINTFIVETWOONEPOINTSIXTWOONEPOINTSEVENSEVENONEPOINTNINETWOTWOPOINTONETWOTWOPOINTTHREETWOZEROPOINTONETWOZEROPOINTEIGHTZEROPOINTNINEONEPOINTZEROFIVEONEPOINTTWOONEPOINTFOURONEPOINTSIXZEROPOINTFIVESEVENONEPOINTTHREESEVENONEPOINTFOURSEVENONEPOINTSIXTWOONEPOINTSEVENSEVENONEPOINTNINESEVENTWOPOINTONESEVENZEROPOINTSIXTWOONEPOINTFOURTWOONEPOINTFIVETWOONEPOINTSIXSEVENONEPOINTEIGHTTWOTWOPOINTZEROTWOTWOPOINTTWOTWOZEROPOINTEIGHTSIXONEPOINTSIXSIXONEPOINTSEVENSIXONEPOINTNINEONETWOPOINTZEROSIXTWOPOINTTWOSIXTWOPOINTFOURSIXZEROONEPOINTTHREESEVENONEFORTYSEVENONEPOINTSIXTWOONEPOINTSEVENSEVENONEPOINTNINESEVENTWOPOINTONESEVENFORNONPOROUSHOLES,THEDIAMETEROFTHESOLDERWINDOWTHE,SOLDER,RESIST,WINDOWSHALLBELARGERTHANTHEDIAMETEROFTHEHOLE050MMTHEWIDTHOFTHESURFACEISOLATIONZONEISALSODETERMINEDBYTHESIZEOFTHEHOLE,WHENTHEDIAMETEROFTHEHOLEISLESSTHANOREQUALTO33MMITSRANGEIS“APERTURE2“WHENTHEDIAMETEROFTHEHOLEISGREATERTHAN33MM,ITSRANGEISTHEAPERTURE16TIMESTHEINNERISOLATIONAREAIS“APERTURE20MM“VERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONEIGHTEENTHPAGES,ATOTALOF32PAGES2SPECIFICWIRINGPRINCIPLE1WIRINGOFPOWERANDGROUNDTRYTOGIVEASEPARATEPOWERLAYERANDBOTTOMEVENIFYOUWANTTOPULLTHESURFACE,THEPOWERLINEANDGROUNDWIRESHOULDBEASMUCHASPOSSIBLESHORTANDTHICKENOUGHFORMULTILAYERPANELS,POWERLAYERSANDFORMATIONSAREGENERALLYAVAILABLEWHATYOUNEEDTOWATCHOUTFORISTHEANALOGPARTANDTHEDIGITALPARTTHEGROUNDANDTHEPOWERSUPPLYMUSTBECUTAPARTEVENIFTHEVOLTAGEISTHESAMEFORSINGLEANDDOUBLEDECKPANELS,THEPOWERLINESSHOULDBEASTHICKANDSHORTASPOSSIBLETHEWIDTHOFTHEPOWERLINEANDGROUNDWIRECANBEBASEDON1MMTHEMAXIMUMLINEWIDTHCORRESPONDSTOTHECURRENTOFTHE1ATOBECALCULATED,ANDTHEPOWERANDGROUNDCONSTITUTETHELOOPASLITTLEASPOSSIBLEFOLLOWINGCHARTINORDERTOPREVENTTHEPOWERLINEFROMBEINGLONGER,THECOUPLINGNOISEOFTHEPOWERLINEISDIRECTLYENTEREDINTOTHELOADDEVICEBEFOREADEVICE,THEPOWERSUPPLYGOESTOTHELOTUSROOTANDTOPREVENTMUTUALINTERFERENCEBETWEENTHEM,FOREACHLOADTHEPOWERSUPPLYISINDEPENDENTOFTHELOTUSROOT,ANDTHEFILTERISFIRSTFILTEREDANDTHENLOADEDINTOTHELOADVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONNINETEENTHPAGES,ATOTALOF32PAGESFOLLOWINGCHARTGOODGROUNDINGSHOULDBEMAINTAINEDINTHEWIRINGFOLLOWINGCHART2SPECIALSIGNALLINEROUTINGROUTINGOFACLOCKSTHECLOCKLINEISONEOFTHEMOSTIMPORTANTFACTORSAFFECTINGTHEEMCINTHECLOCKLINESHOULDBELESSHOLES,ASFARASPOSSIBLETOAVOIDANDOTHERSIGNALLINESAREINPARALLEL,ANDSHOULDBEAWAYFROMTHEGENERALSIGNALLINE,SOASTOAVOIDINTERFERENCETOTHESIGNALLINEATTHESAMETIME,WESHOULDAVOIDTHEPOWERSUPPLYBOARD,POWERANDCLOCKTOPREVENTMUTUALINTERFERENCEWHENACIRCUITBOARDUSESMULTIPLECLOCKSOFDIFFERENTFREQUENCIES,TWODIFFERENTFREQUENCYCLOCKLINESCANNOTBEPARALLELGOLINETHECLOCKLINESHOULDALSOBEAVOIDEDASCLOSEASPOSSIBLETOTHEOUTPUTINTERFACETOPREVENTTHEHIGHFREQUENCYCLOCKFROMBEINGCOUPLEDTOTHEOUTPUTCABLELINELAUNCHALONGTHEROUTEVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONTWENTIETHPAGES,ATOTALOF32PAGESIFTHEREISASPECIALCLOCKONTHEBOARD,THECHIPMUSTNOTBEPAVEDBELOWITCOPPERSHOULDBELAIDUNDERITCANTHESPECIFICTERRITORYFORMANYOFTHECHIPSHAVEREFERENCETOTHECRYSTALOSCILLATOR,THESECRYSTALSSHOULDNOTGOUNDERTHELINE,TOCOPPERISOLATIONATTHESAMETIME,THECRYSTALHOUSINGCANBEGROUNDEDFORSIMPLESINGLEANDDOUBLEDECKPLATESWITHOUTPOWERLAYERSANDFORMATIONS,THECLOCKLINECANBESEENBELOWBPAIREDDIFFERENTIALSIGNALLINEROUTINGPAIRSOFDIFFERENTIALSIGNALLINES,USUALLYPARALLELLINES,ASLITTLEASPOSSIBLETHROUGHTHEHOLE,MUSTBEPUNCHED,SHOULDBETWOLINESDRILLTOGETHERTOMAKEIMPEDANCEMATCHINGAGROUPOFBUSESWITHTHESAMEPROPERTYASCSHOULDTRYTOWALKSIDEBYSIDEASLONGASPOSSIBLEDSOMEBASICROUTINGPRINCIPLESTAKEINTOACCOUNTTHEHEATDISSIPATION,AVOIDWELDINGANDOTHERFACTORS,ASFARASPOSSIBLETOUSETHEFOLLOWINGSHOWNINGOODLAYOUT,AVOIDBADLAYOUTVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONTWENTYFIRSTPAGES,ATOTALOF32PAGESTWO,WHENTHESOLDERJOINTSPACINGISVERYSMALLSUCHASADJACENTPADSOFPATCHDEVICES,THESOLDERJOINTSSHALLNOTBEDIRECTLYCONNECTEDREMOVETHETHROUGHHOLEFROMTHEPATCHPADASFARASPOSSIBLEFROMTHEPADVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONTWENTYSECONDPAGES,ATOTALOF32PAGES3THEADDITIONOFCOPPERDEPOSITSMULTILAYERBOARDINNERLAYERCOPPER,WITHNEGATIVENEGATIVEIFTHEOUTERLAYEROFCOPPERSHOULDBEFULLYCONSOLIDATED,ITSHALLNOTBEDUEAVOID,PREFERABLYWITHAGRIDOFCOPPER,WITHAMINIMUMMESHOFLESSTHAN06MMX06MM,THEPROPOSED30MILX30MILMESHISAPPLIEDTOCOPPERFIGUREVERSIONED02SHANGHAIBELLPCBDESIGNSPECIFICATIONTWENTYTHIRDPAGES,ATOTALOF32PAGESPOSTPROCE