pic单片机晶振设计

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1、AN588PICmicro™MicrocontrollerOscillatorDesignGuideDesignChallengesAuthor:KimPeckThePICmicromicrocontrollersofferuniquedesignConsultantchallengesbecausetheyareuniquelyflexible.FlexibilityusuallydemandsdifficultdecisionsontheDesigningaclockoscillatorwithoutsomeknowledgeofpartofthedesigner,butoffersot

2、herwiseunattainablethefundamentalprincipalsofacousticresonatorsisperformance.Themultipleoscillatoroptionsandwidepossiblebutfraughtwiththeuncertaintyof"cutandtry"rangeofoperatingvoltagesrequireawarenessofmethods.Whiletheoscillatormaybemadetorunwithadvantagesandtrade-offsofvariousconfigurations.thec

3、hosenresonator,itisquitelikelythattheunitwillThePICmicrodesignermustbeabletoaccuratelybeslightlyofftheintendedfrequency,begrosslyoffpredictstabilityperformanceofvariousconfigurationfrequencybecauseitisoperatingonanunintendedandthenobtainthatperformancefromthePICmicromode,orhaveunacceptabletemperat

4、urecharacteris-clockinordertosuccessfullyimplementtheseticsbecausethewrongresonatorwaschosenforthefunctions.application.WideVoltageRangeThisapplicationnoteisprimarilyforinformationalThePICmicrooperatesoversuchawidevoltagerangepurposes.Itisintendedtohelpthedesignerofclockthattheoscillatorparameter

5、smaybethelimitingfactoroscillatorsunderstandtheparametersofcrystalintheoperationofthecontroller.Iflowpoweroperationresonatorsandtheterminologyofthecrystalresonatoratlowvoltagesisdesired,theloopgainmustberaisedindustry,bothofwhichtendtobesomewhatmysteriousinordertoinsurereliableclockoperation.Ifan

6、ominalandarcanetotheuninitiated.Detailsofcrystalcutsandsupplyvoltageisavailable,theloopgainmustberotations,forinstance,areofnousetotheoscillatorreducedinordertopreventexcessivepowerdissipationdesigner,onlythedesignerofcrystals.Theoscillatorinthecrystal.Ifbatteryoperationisintended,thenadesignerst

7、illneedstounderstandandbeabletocarefulbalancemustbestruckbetweenreliableopera-predicttheperformanceandtrade-offsassociatedwithtionatthelowvoltage,anddamagingdelicateresona-theseparameters.Thisisnotanin-depthorrigoroust