ti_hardware_design_checklist

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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