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1、HardwareDesignChecklist1HardwareDesignChecklistAsyouarecreatingtheschematicsforyourprojecthereareafewthingstoconsider.BeforeyoubeginDocumentationMakesureyouhavethelatestversionofdocumentation,especiallythedatasheetandsiliconerrata.TIP:Trysearchingthedocumentationforwordssuchas:"must","requir
2、e","donot","shall","note:",etc.Importantcriteriaforthedevicewilltypicallycontainoneormoreofthesewords.Thisisaneasywaytomakesureyouhavenotmissedanythingimportant.TIP:-oneachti.comdeviceproductfolderthereisabutton"Alertmeaboutchangestothisproduct".Registrationherewillenableproactiveautomaticno
3、tificationofdeviceerrata.Pinout?Haveyouverifiedthatyourpinlabelscorrespondtothecorrectpinnumbers??Haveyouverifiedthatthepowerpinsareconnectedtothecorrectsupplyrails??Pullups/Pulldowns:Ifopposinganinternalresistoruse1kresistor.Tocomplementuseweakervaluesuchas4.7kresistor.CriticalConnectionsDe
4、couplingCapacitorsVoltagesfromtracesonaprintedcircuitboardcancoupletoeachotherinplaceswhereitisnotdesired,(likepowersupplyplanes).Todecouplethetraces,weaddcapacitorstoabsorbsomeofthevoltageandhelpreducethiseffect.Formoreinformationonhowtocorrectlyplacedecouplingcaps,seethedatasheetsectionfor
5、power-supplydecoupling.PLLandsomeanalogsuppliesbenefitfromfiltersorferritebeadstokeepthenoisefromcausingclockjitter.Theminimumrecommendationisaferritebeadwitharesonanceat100MHzalongwithatleastonecapacitoronthedevicesideofthebead.Additionalrecommendationistoaddonecapacitorjustbeforethebeadtof
6、ormaPifilter.Thefilterneedstobeascloseaspossibletothedevicepin,withthedevicesidecapacitorbeingthemostimportantthingtobeclosetothedevicepin.PLLpinsclosetogethercanbecombinedonthesamesupply.PLLpinsfartherawayfromeachothermayneedtheirownfilteredsupply.Referto?GeneralHardwareDesign/BGAPCBDesign/
7、BGADecouplingWiki[1]HardwareDesignChecklist2PowerSequencingAreallrequirementsbeingmetintermsoftheorder,delays,etc.ofthepowersupplies?ClockingMakesureyourinputclock/crystalmeetsthedatasheetrequirements.Forexample:?Frequency?ESRforcrystal?Crystalandc
