蒋姝佩毕业设计译文

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1、西安工程大学本科毕业设计（译文）译文原文题目：A5191HRTAMISHART™Modem译文题目：A5191HRT型HART调制解调器学院：电子信息学院专业班级：自动化2009级04班学生姓名：蒋姝佩学号：4090501043522西安工程大学本科毕业设计（译文）22西安工程大学本科毕业设计（译文）A5191HRTAMISHART™Modem1.FeaturesCanbeusedindesignspresentlyusingtheSYM20C15Single-chip,half-duplex1200bits

2、persecondFSKmodemBell202shiftfrequenciesof1200Hzand2200Hz3.3V-5.0VpowersupplyTransmit-signalwaveshapingReceiveband-passfilterLowpower:optimalforintrinsicallysafeapplicationsCMOScompatibleInternaloscillatorrequires460.8kHzcrystalorceramicresonatorMeetsHARTph

3、ysicallayerrequirementsIndustrialtemperaturerangeof-40°Cto+85°CAvailablein28-pinPLCCand32-pinLQFPpackages2.DescriptionTheA5191HRTisasingle-chip,CMOSmodemforuseinhighwayaddressableremotetransducer(HART)fieldinstrumentsandmasters.Themodemandafewexternalpassiv

4、ecomponentsprovideallofthefunctionsneededtosatisfyHARTphysicallayerrequirementsincludingmodulation,demodulation,receivefiltering,carrierdetect,andtransmit-signalshaping.TheA5191HRTispin-compatiblewiththeSYM20C15.SeethePinDescriptionandFunctionalDescriptions

5、ectionsfordetailsonpincompatibilitywiththeSYM20C15.TheA5191HRTusesphasecontinuousfrequencyshiftkeying(FSK)at1200bitspersecond.Toconservepowerthereceivecircuitsaredisabledduringtransmitoperationsandviceversa.Thisprovidesthehalf-duplexoperationusedinHARTcommu

6、nications.22西安工程大学本科毕业设计（译文）Figure2-128-PinPLCCPinoutDiagrams(green&non-green)Figure2-232-PinLQFPPinoutDiagrams(green&non-green)Table2-1PinoutSummary28-PinPLCC,A5191HRTP/Pg(12197-504/508)PinN0.SignalNameTypePindescription1TEST1InputConnecttoVSS2TEST2-Noconn

7、ect3TEST3-Noconnect4TEST4-Noconnect5TEST5InputConnecttoVSS6INRESETInputResetalldigitallogicwhenlow7TEST7InputConnecttoVSS8TEST8InputConnecttoVSS9TEST9InputConnecttoVSS10OTXAOutputOutputtransmitanalog,FSKmodulatedHARTtransmitsignalto4-20mAloopinterfacecircui

8、t22西安工程大学本科毕业设计（译文）11IAREFInputAnalogreferencevoltage12ICDREFInputCarrierdetectreferencevoltage13OCBIASOutputComparatorbiascurrent14TEST10InputConnecttoVSS15VDDAPowerAnalogsupplyvoltage16IRXAInputFSKmo