[電子設(shè)計論文精品]單片機控制的多路數(shù)據(jù)采集系統(tǒng)

畢業(yè)設(shè)計（論文）題目單片機控制的多路數(shù)據(jù)采集系統(tǒng)作者學院信息與電氣工程學院專業(yè)通信工程學號指導教師老師二一一年五月二十日畢業(yè)設(shè)計（論文）任務(wù)書信息與電氣工程學院院通信工程系（教研室）系（教研室）主任（簽名）年月日學生姓名學號專業(yè)通信工程1設(shè)計（論文）題目及專題單片機控制的多路數(shù)據(jù)采集系統(tǒng)2學生設(shè)計（論文）時間自2011年2月20日開始至2011年6月5日止3設(shè)計（論文）所用資源和參考資料（1）單片機原理與實用技術(shù)（2）BERNARDROSEANALOGTODIGITALANDDIGITALTOANALOGCONVERSION（3）數(shù)據(jù)采集與處理技術(shù)4設(shè)計（論文）應完成的主要內(nèi)容（1）介紹多路數(shù)據(jù)采集的發(fā)展歷史、現(xiàn)況及將來的發(fā)展趨勢（2）簡介單片機的原理、作用（3）多路數(shù)據(jù)采集的總體設(shè)計框圖（4）多路數(shù)據(jù)采集系統(tǒng)設(shè)計及原理說明（5）多路數(shù)據(jù)原理圖設(shè)計及說明5提交設(shè)計（論文）形式（設(shè)計說明與圖紙或論文等）及要求（1）論文文本格式嚴格按照學校對本科畢業(yè)生論文格式的規(guī)定完成（2）要求文字流暢、無G19181G2047字、G12538G2524設(shè)計規(guī)G14551G113G12論文G1209學校規(guī)定的G256G6183G2372G10268G257和G256電G4388G10268G257提交G13485G6363G4560G13781G50846發(fā)題時間2011年2月20日G6363G4560教G5084（簽名）學生（簽名）畢業(yè)設(shè)計（論文）指導人評語指導人A2A3A0A5A6A7A8指導人評定成績畢業(yè)設(shè)計（論文）評閱人評語評閱人（簽名）年月日評閱人評定成績畢業(yè)設(shè)計（論文）答辯記錄日期學生學號班級題目提交畢業(yè)設(shè)計（論文）答辯委員會下列材料1設(shè)計（論文）說明書共頁2設(shè)計（論文）圖紙共頁3指導人、評閱人評語共頁畢業(yè)設(shè)計（論文）答辯委員會評語答辯委員會主任A1A4A9A10委員A1A4A9A10A1A4A9A10A1A4A9A10A1A4A9A10答辯成績總評成績摘要本設(shè)計主要完成G1114G3534G1122AT89S51單片機控制的數(shù)據(jù)采集系統(tǒng)的G11840G1226電路設(shè)計G1209及G11468應的G17731G1226設(shè)計G452本系統(tǒng)的G11840G1226設(shè)計主要G2265G6336多路G17728G6454開G1863及G2081G13634G6930G3835電路的設(shè)計G712采G7691G1457G6357電路的設(shè)計G712G8181數(shù)G17728G6454電路的設(shè)計G712數(shù)G8181G17728G6454電路的設(shè)計G452多路G17728G6454開G1863及G2081G13634G6930G3835電路的設(shè)計G1025G18337G9869介紹G1114多路開G1863的G17885G6333、AD521G6930G3835G1505數(shù)的計G12651G1209及多路開G1863CD4051和G6930G3835G3132AD521G11840G1226G17842G6521電路G452采G7691G1457G6357電路的設(shè)計G1025G18337G9869介紹G1114采G7691G1457G6357電路的原理和主要參數(shù)G1209及采G7691G1457G6357G3132的G17885G6333和G17842G6521電路G452G8181數(shù)G17728G6454電路的設(shè)計G1025G18337G9869介紹G1114系統(tǒng)A/D通G17959的G17885G6333和A/DG17728G6454G3132的G2520G20045G16835G5058G2010G7524G1209及A/DG17728G6454G3132AD574的介紹、G17767G1849G7053式和G17842G6521電路G452數(shù)G8181G17728G6454電路的設(shè)計G1025G18337G9869介紹G1114D/A通G17959的G17885G6333G712D/AG17728G6454G3132的G17885G6333G1209及D/AG17728G6454G3132DAC0832的介紹、G17842G6521電路和DAC0832的G17767G1998G7053式G452G11840G1226設(shè)計G1025G17836介紹G1114單片機的G17885G6333G712單片機AT89S51的時G19059電路和G3809G1313電路G452本系統(tǒng)的G17731G1226設(shè)計主要G2265G6336G13546G16805G3132的G17885G6333G712G2520G18108G2010的流程圖G1209及程G5219的設(shè)計G452本設(shè)計G1025G17836G2010G7524G1114系統(tǒng)的G5627G14033及G16835G5058G452本設(shè)計G3534本G990實現(xiàn)G1114對多路數(shù)據(jù)采集的設(shè)計G712G1306G7171G11013G1122時間G13051G1957G1209及自G5061的G11705G16794G8712G5191G7389G19492等原G3252G712G8821G7389對所設(shè)計的G6984G1022系統(tǒng)G17839G15904G16855G16809及G1235G11507G712G3252G13792G1075G4613G8821G14033G1582G1998實G10301G1998來G727G2528時G2499G14033G7389G5468多G19394題G17836G8821G7389發(fā)現(xiàn)G712G5088G7407G13781G5084和G2528學G13485G1116G6363G1998G452關(guān)鍵詞數(shù)據(jù)采集G727AT89S51單片機G727CD4051G727DAC0832ABSTRACTCOMPLETEDTHEDESIGNOFTHEMAINAT89S51MICROCONTROLLERBASEDDATAACQUISITIONSYSTEMHARDWAREDESIGNANDTHECORRESPONDINGSOFTWAREDESIGNTHEHARDWAREDESIGNOFTHESYSTEMINCLUDEMULTISWITCHANDPREAMPLIFIERCIRCUITDESIGN,SAMPLEANDHOLDCIRCUIT,ADCCIRCUITDESIGN,DIGITALTOANALOGCONVERSIONCIRCUITMULTISWITCHANDPREAMPLIFIERCIRCUITDESIGNHIGHLIGHTSTHECHOICEOFMULTIWAYSWITCH,AD521,ANDTHECALCULATIONOFTHEMAGNIFICATIONCD4051MUXHARDWARECONNECTIONCIRCUITANDAMPLIFIERAD521SAMPLEANDHOLDCIRCUITDESIGNFOCUSESONTHEPRINCIPLESOFSAMPLEANDHOLDCIRCUITANDTHEMAINPARAMETERSANDSAMPLEANDHOLDCIRCUITFORTHESELECTIONANDCONNECTIONANALOGDIGITALCONVERSIONCIRCUITSFOCUSEDONTHEDESIGNOFTHESYSTEMA/DCHANNELSELECTIONANDA/DCONVERTEROFTHEERRORANALYSISANDA/DCONVERTERAD574INTRODUCTION,INPUTANDCONNECTIONCIRCUITSDIGITALANALOGCONVERSIONCIRCUITDESIGNHIGHLIGHTSTHED/ACHANNELSELECTION,D/ACONVERTERSELECTIONANDD/ACONVERTERDAC0832INTRODUCTION,CONNECTINGTHEOUTPUTCIRCUITANDTHEDAC0832ITALSODESCRIBESTHEHARDWAREDESIGN,THECHOICEOFMICROCONTROLLER,MICROCONTROLLERAT89S51THECLOCKCIRCUITANDRESETCIRCUITTHESOFTWAREDESIGNINCLUDESTHECHOICEOFCOMPILER,VARIOUSPARTSOFTHEFLOWCHARTANDPROGRAMDESIGNTHISDESIGNALSOANALYZEDTHESYSTEMPERFORMANCEANDERRORSTHEDESIGNISBASICALLYREALIZEDTHEDESIGNOFMULTICHANNELDATAACQUISITION,BUTBECAUSEOFTIGHTTIMEANDLIMITEDKNOWLEDGEOFTHEIROWNREASONS,NOTTHEENTIRESYSTEMISDESIGNEDFORDEBUGGINGANDSIMULATION,ANDTHUSHAVENOTBEENABLETOMAKEINKINDOUTTHESAMETIMETHEREMAYBEMANYPROBLEMSHAVENOTBEENFOUND,GIVINGHOPETHATTEACHERSANDSTUDENTSKEYWORDSDATAACQUISITIONAT89S51MICROCONTROLLERCD4051DAC0832A11A12A13A14A15A16A17A13A18A19A20A21A22A23A24A25A26I目錄第一章引言111多路數(shù)據(jù)采集系統(tǒng)簡介112本設(shè)計的主要任G21651第二章系統(tǒng)硬件設(shè)計321G11840G1226設(shè)計G5617G5831322G11840G1226電路設(shè)計4221多路G17728G6454開G18634222G2081G13634G6930G3835電路6223采G7691/G1457G6357電路8224G8181/數(shù)G17728G6454電路12225數(shù)/G8181G17728G6454電路17226G11840G1226和單片機的G17842G6521電路22第三章系統(tǒng)的軟件設(shè)計2631KEILC51G13546G16805G3132簡介26311UVISION2集成開發(fā)G10627G367126312G13546G17765G3132和G16855G16809G31322732程G5219流程圖28321主程G5219流程圖28322A/DG17728G6454程G5219的流程圖和D/AG17728G6454程G5219的流程圖2933系統(tǒng)總圖30第四章系統(tǒng)性能及誤差分析3141系統(tǒng)G2499G19764G5627G6526G705731411G1314G2163G13803G6526G705731412G6251G5190G6212G6526G705731第五章結(jié)論32致謝33參考文獻34A27A28A29A30A31A32A33A29A34A35A36A37A38A39A40A41A42II附錄135附錄2（系統(tǒng)硬件總圖）38A27A28A29A30A31A32A33A29A34A35A36A37A38A39A40A41A421第一章引言11多路數(shù)據(jù)采集系統(tǒng)簡介G3324工業(yè)生G1147和科學技術(shù)研G12362G17819程的G2520G15904業(yè)G1025G712常常要對G2520種數(shù)據(jù)G17839G15904采集G712隨著現(xiàn)代化工業(yè)的發(fā)展G712多路數(shù)據(jù)采集系統(tǒng)成為日益G18337要的技術(shù)G712廣泛應用G1122工農(nóng)業(yè)等G15904業(yè)G452多路數(shù)據(jù)采集系統(tǒng)通常采用的G7053法G7389G712用微機控制G712微機G3324工業(yè)領(lǐng)域G1025的一G1022主要應用G4613G7171與原G7389設(shè)備G11468結(jié)G2524G712構(gòu)成新的數(shù)字化、智G14033化的測控系統(tǒng)G712從G13792提高原G7389設(shè)備的G5627G14033G712G1306微機設(shè)備G3809雜、成本較高G712使得微機控制的數(shù)據(jù)采集系統(tǒng)技術(shù)難度、成本都G11468應的提高G712從G13792制約G1114微機G3324數(shù)據(jù)采集這G7053面的應用G452隨著單片機技術(shù)的飛速發(fā)展G712應用領(lǐng)域日益擴G3835G712G2520種型號、系列的單片機不斷推G1998G712許多新技術(shù)、新工藝被采用G712G3252G13792具G7389更高的G5627G14033價格比1G452單片機控制的多路數(shù)據(jù)采集系統(tǒng)使用非常G7053便、G5627G14033優(yōu)越、運G15904G2499G19764、廣泛地應用G1122G2520G15904G2520業(yè)G452本文利用AT89S51單片機設(shè)計G1114一G1022多路數(shù)據(jù)采集系統(tǒng)G712著G18337介紹該系統(tǒng)的特G9869及實現(xiàn)G7053法G452本設(shè)計采用單片機作為控制來構(gòu)成多路數(shù)據(jù)采集系統(tǒng)G712并完成G1114G17731G11840G1226的設(shè)計G452G3324G17819程控制及G2520種儀G3132表儀表G1025G712G11013微型計G12651機G17839G15904實時控制及實時數(shù)據(jù)處理G712單片機所加工的信息總G7171數(shù)字量G452被控制或測量對象的G7389G1863參量往往G7171一些G17842續(xù)變化的G8181擬量G712如溫度、濕度、壓力、流量、速度等G452系統(tǒng)通G17819多路G8181擬開G1863采集多路數(shù)據(jù)G712使其通G17819多路G8181擬G17728G6454開G1863G712把采集到的多路G8181擬信號經(jīng)G17819G6930G3835、采G7691G1457G6357、A/DANALOGTODIGITALCONVERTERG712G8181數(shù)G17728G6454G3132G17728G6454電路G17728G6454成數(shù)字信號G712G17767G1849單片機G17839G15904處理G712處理后發(fā)G1998的數(shù)字信號經(jīng)G17819D/ADIGITALTOANALOGCONVERTERG712數(shù)G8181G17728G6454G31322G17728G6454電路G17728G6454成G8181擬信號G452從G13792達到采集數(shù)據(jù)G712監(jiān)控G712濾波等目的G452本設(shè)計的系統(tǒng)實現(xiàn)G1114一種高G5627G14033、高智G14033的實用型多路數(shù)據(jù)采集系統(tǒng)G712G2499達到對收集的數(shù)據(jù)G17839G15904監(jiān)控G712濾波等目的G45212本設(shè)計的主要任務(wù)本設(shè)計用單片機控制多路數(shù)據(jù)采集系統(tǒng)G712本文著G18337介紹該系統(tǒng)的工作原理及G11840G1226與G17731G1226設(shè)計G712本設(shè)計的主要組成如下（1）多路數(shù)據(jù)G17767G1849單元G452（2）采G7691G1457G6357電路的A/DG17728G6454單元G452（3）G11840G1226和單片機的G17842G6521電路G452（4）單片機G17767G1998的數(shù)據(jù)鎖存和D/AG17728G6454單元G452多路數(shù)據(jù)采集系統(tǒng)的G7053案及總體設(shè)計G712G2265G6336主體電路的設(shè)計和單片機控制電路的設(shè)計（要用到單片機的控制G6984G1022系統(tǒng)）G712G3252此要完成單片機應用系統(tǒng)的G11840、G17731G1226設(shè)計并完A43A44A45A46A47A48A49A45A50A51A52A53A54A55A56A57A582A59A60A61A62成G17731G1226G16855G16809G712G1209滿足G6984G1022系統(tǒng)的要求G452G6984G1022系統(tǒng)的設(shè)計G2265G6336G11840G1226設(shè)計和G17731G1226設(shè)計兩G18108G2010G452G11840G1226設(shè)計主要完成多路數(shù)據(jù)采集G6984G1022G11840G1226電路及I/OG6521口的設(shè)計G2265G6336G8181擬多路開G1863電路、運G12651G6930G3835電路、采G7691G1457G6357電路、G8181數(shù)G17728G6454電路、G11840G1226和單片機的G17842G6521電路、數(shù)G8181G17728G6454電路、G17728G6454開G1863G1457護電路等組成G727G17731G1226設(shè)計主要完成控制G6984G1022系統(tǒng)的應用程G5219與G16855G16809G452G2265G6336主程G5219、A/D和D/AG17728G6454程G5219、多路開G1863控制G1209及I/OG6521口控制等程G5219的設(shè)計G452系統(tǒng)總框圖如圖1所示G452圖1系統(tǒng)總框圖A63A64A65A66A67A63A66A67A63A68A68A69A70A71A72A73A69A74A75A72A73A76A77A78A79A80A81A82數(shù)模轉(zhuǎn)換執(zhí)行機構(gòu)A83A84A85A86A87A88A89A90A91A92A93A94A95A96A92A97A98A99A100A101A102A103A104A1053第二章系統(tǒng)硬件設(shè)計21硬件設(shè)計思想多路數(shù)據(jù)采集系統(tǒng)的正常運G15904依賴G1122G6984G1022系統(tǒng)G11840G1226設(shè)備的科學設(shè)計G452根據(jù)課題設(shè)計任G2165的要求G712結(jié)G2524G17731G1226的設(shè)計G712G17885G6333G2524適的電路元G1226G712設(shè)計G2524理的G6521口電路G1209便G14033夠高效率、穩(wěn)定G2524理、G7053便的實現(xiàn)多路數(shù)據(jù)采集G452多路數(shù)據(jù)采集系統(tǒng)的G11840G1226G18108G2010G2010為多路數(shù)據(jù)G17767G1849G18108G2010G712采G7691G1457G6357G18108G2010G712A/DG17728G6454G18108G2010G712G11840G1226和單片機的G17842G6521電路G18108G2010G712D/AG17728G6454G18108G2010G452（1）多路數(shù)據(jù)G17767G1849G18108G2010G3324不要求高速采G7691的場G2524G712一般采用共享的A/DG17728G6454通G17959G712G2010時對G2520路G8181擬量G17839G15904G8181/數(shù)G17728G6454G712目的G7171簡化電路G712降G1314成本G452用G8181擬多路開G1863來輪流切G6454G8181擬量與A/DG17728G6454G3132間的通G17959G712使得G3324一G1022特定的時間內(nèi)G712只允許一路G8181擬信號G17767G1849到A/DG17728G6454G3132G712從G13792實現(xiàn)G2010時G17728G6454的目的G452一般G8181擬多路開G1863G73892NG1022G8181擬G17767G1849端G712NG1022通G17959G17885G6333端G712G11013NG1022G17885通信號控制G17885G6333其G1025一G1022開G1863閉G2524G712使對應的G8181擬G17767G1849端與多路開G1863的G17767G1998端G6521通G712讓該路G8181擬信號通G17819G452G7389規(guī)律地周期G5627改變NG1022G17885通信號G712G2499G1209按固定的G5219列周期G5627閉G2524G2520G1022開G1863G712構(gòu)成一G1022周期G5627G2010組的G2010時G3809用G17767G1998信號G712G11013后面的A/DG17728G6454G3132G2010時G3809用對G2520通G17959G8181擬信號G17839G15904周期G5627的G17728G6454G452G3324數(shù)據(jù)采集時G712來自傳感G3132的G8181擬信號G712一般都G7171比較G5381的電G5191信號G712G3252此G19668要G6930G3835電路把G17767G1849的G8181擬信號G17839G15904適G5415的G6930G3835G452G6930G3835G3132的作用G7171將這些微G5381的G17767G1849信號G17839G15904G6930G3835G712G1209便G1817G2010利用A/DG17728G6454G3132的滿量程G2010G17788率G452為G1114G1817G2010利用A/DG17728G6454G3132的G2010G17788率（A/DG17728G6454G3132G17767G1998的數(shù)字G1313數(shù)）G712G4613要把G8181擬G17767G1849信號G6930G3835到與A/DG17728G6454G3132滿量程電壓G11468應得電G5191G1552G452（2）采G7691G1457G6357G18108G2010G8181擬信號G17839G15904A/DG17728G6454時G712從G2563G2172G17728G6454到G17728G6454結(jié)G7475G17767G1998數(shù)字量G712G19668要一定的G17728G6454時間G452G3324這G1022G17728G6454時間內(nèi)G712G8181擬信號要G3534本G1457G6357不變G452G2554G2029G17728G6454G12946度G8821G7389G1457G16789G712特G2047G5415G17767G1849信號G20069率較高時G712G1262G17908成G5468G3835的G17728G6454G16835G5058G452要G19462止這種G16835G5058的G1147生G712G5529G20047G3324A/DG17728G6454開始時將G17767G1849信號的電G5191G1457G6357G1315G712G13792G3324A/DG17728G6454結(jié)G7475后G2460要G17331G17406G17767G1849信號的變化G452實現(xiàn)這種G2163G14033G2499G1209用采G7691/G1457G6357G3132來實現(xiàn)G712G3252G13792G712G11013G1122采G7691/G1457G6357G3132的加G1849G712G3835G3835提高G1114數(shù)據(jù)采集系統(tǒng)的采集G20069率G452（3）A/DG17728G6454G18108G2010G3252為單片機只G14033處理數(shù)字信號G712所G1209G19668要把G8181擬信號G17728G6454成數(shù)字信號G712實現(xiàn)這一G17728G6454G2163G14033的G3132G1226G7171A/DG17728G6454G3132G452A/DG17728G6454G3132G7171采G7691通G17959的G7692G5527G712G3252此G712A/DG17728G6454G3132G7171G5445G2721A106A107A108A109A110A111A112A108A113A114A115A116A117A118A119A120A1214數(shù)據(jù)采集系統(tǒng)采G7691速率和G12946度的主要G3252G13044G1055一G452（4）G11840G1226和單片機的G17842G6521G18108G2010該G18108G2010用來將傳感G3132G17767G1998的數(shù)字信號G17839G15904G6984形或電G5191G16855G6984G712G9994后G1889傳G13485單片機G452單片機及G3818設(shè)G17139G17143對數(shù)據(jù)采集系統(tǒng)的工作G17839G15904G12661理和控制G712并對采集到的數(shù)據(jù)作G11468應的處理G452（5）D/AG17728G6454G18108G2010D/AG17728G6454G18108G2010G1075G7171數(shù)據(jù)采集系統(tǒng)的一G1022G18337要G18108G2010G712G3324數(shù)字控制系統(tǒng)G1025作為G1863G19202G3132G1226G712用來把單片機G17767G1998的數(shù)字信號G17728G6454成電壓或電流等G8181擬信號G712并G17877G1849G6203G15904機構(gòu)G17839G15904控制或G16855G14422G45222硬件電路設(shè)計本系統(tǒng)的G11840G1226設(shè)計主要G2265G6336多路G17728G6454開G1863及G2081G13634G6930G3835電路的設(shè)計G712采G7691G1457G6357電路的設(shè)計G712G8181數(shù)G17728G6454電路的設(shè)計G712數(shù)G8181G17728G6454電路的設(shè)計G452221多路轉(zhuǎn)換開關(guān)1多路開G1863的G17885G6333多路G17728G6454開G1863G3324G8181擬G17767G1849通G17959G1025的作用G7171實現(xiàn)多G17885一G6817作G712G2375利用多路G17728G6454開G1863將多路G17767G1849G1025的一路G6521至后續(xù)電路G452切G6454G17819程G2499G3324CPU或數(shù)字電路的控制下完成G452常用的G8181擬開G1863G3835都采用CMOS工藝G712如8G178851開G1863CD4051、G24644G178851開G1863CD4052、G9893G178851開G1863CD4053等G452本設(shè)計G7171實現(xiàn)32路數(shù)據(jù)采集G712所G1209G17885G63334片8G178851的G8181擬開G1863G452G8181擬多路開G1863G1025G712不G2499G18003G1825G4560通電G19471RON的存G3324G452RON使信號電壓G1147生G17312G14865G712G17312G14865量與流G17819開G1863的電流成正比3G452設(shè)計G1025G5088G7407RON越G4579越G3921G712G1306G7171RON越G4579的G3132G1226價格越高G452所G1209根據(jù)G3132G1226的價格和系統(tǒng)的容G5537度G712G17885G6333RON的G1552G452多路開G1863的主要參數(shù)G7171G12946度和速度G452多路開G1863的G12946度G1209傳G17767G16835G5058的G3835G4579來間G6521表示G452多路開G1863的速度G1209信號通G17819多路開G1863的通G17819率來間G6521表示G452傳G17767G16835G5058G7171G15925量多路開G1863的一G1022G6363G7643G712多路開G1863的傳G17767G16835G5058G2265G6336兩G1022G7053面G452（1）多路開G1863G4560通電G19471加G990信號源G19471G6251與G17139G17745G19471G6251構(gòu)成G1114G2010壓G3132G452G5415要求G12946度為001時G712G17139G17745G19471G6251G4613應至G4581G7171開G1863G4560通電G19471與信號源G19471G6251G1055和的104G1505G452G3324數(shù)據(jù)采集系統(tǒng)G1025G712多路開G1863的G17139G17745一般G7171采G7691/G1457G6357G3132G452G3252為G1868型的多路開G1863的G4560通電G19471為200G8443G3994G794200G2327G8443G3994G712所G1209G712如G7536信號源G19471G6251G3324G1972G11346G8443G3994G1209下G712G2029作為G17139G17745的采G7691/G1457G6357G3132G712其G17767G1849G19471G6251應G3324108G8443G3994G1209G990G452（2）多路開G1863的G9443電流G3324信號源G19471G6251G990G1147生G1571G12239電壓G712G13792G9443電流與工作溫度G1863系G5468G3835G452G3252此G712應該根據(jù)G7380高工作溫度時的G9443電流來計G12651G1571G12239G16835G5058G452通G17819率G7171G15925量多路開G1863的G2490一G1022G6363G7643G712G7171多路開G1863從一G1022通G17959切G6454并使下一G1022通G17959G5326G12447到規(guī)定G12946度所G14033達到的G7380高切G6454率G452G4439一G7053面G2474G1927G1122多路開G1863G5326G12447時間G712并與規(guī)定A122A123A124A125A126A127A128A124A129A130A131A132A133A134A135A136A1375的G5326G12447G12946度G7389G1863G712G2490一G7053面為G1114G18003G1825兩G1022通G17959G2528時G6521通G712多路開G1863被設(shè)計為“G1820斷后通”G712這G3698加G1114斷開到G6521通的G5322時G712G5445G2721G1114通G17819率的提高G452G3324G11842定多路開G1863的通G17819率時G712要G17331據(jù)系統(tǒng)的采G7691速率來考G15397G452根據(jù)G990面的G2010G7524G712本設(shè)計G17885用的G7171采用CMOS工藝的8G178851開G1863CD4051G452CD4051的G8181擬信號G14551G3272為75VG712G4560通電G19471RON為125G8443G3994G712G1863斷G9443電流為01AG712開G1863時間為120NSG4522多路G17728G6454開G1863CD4051CD4051G11013電G5191G17728G6454電路、G16805G11733G20549G2172電路和CMOSG8181擬開G1863電路G989G18108G2010組成G452開G1863G18108G2010的G1391電電壓為VEE（G1314端）和VDD（高端）G712G3252此G19668要的控制電壓為VEEG794VDDG712電G5191G17728G6454電路將G17767G1849的G17935G17765控制電壓（A、B、C、INH端）從VSSG794VDDG17728G6454到VEEG794VDDG1209滿足開G1863控制的G19668要G452（1）CD4051的G5353G14062G2163G14033及使用G7053法VEE、VDD、VSS電源G13459G452VSSG6521地G452單G7509G5627信號G17767G1849時G712VEE和VDDG2010G2047G6521地和正電壓G712G2464G7509G5627G17767G1849時G712VEE和VDDG2010G2047G6521G17139電壓和正電壓G452VDD與VEEG1055G5058G7380G3835為16VG452C、B、A通G17959地G3348G452G5415CBA000BG794111B時G712G2499G17885G6333通G17959S0G794S7G452INHG12117止控制端G452INH1時G712所G7389通G17959G3355被斷開G727G5415INH0時G712G2029根據(jù)CBA的G1552G17885G6333一G1022G11842定的通G17959與G17767G1998G6521通（G2375G2499G17885G6333一G1022G11013CBAG11842定的G17767G1849通G17959與G17767G1998通G17959）G452使用該控制端G17836G2499G1209G7053便地實現(xiàn)多通G17959的擴展G452S0G794S78G1022通G17959的G17767G1849G17767G1998通G17959G452G5415用作多到一開G1863使用時為G17767G1849G13459G712G5415用作一到多開G1863使用時為G17767G1998G13459G452OUTG17767G1998/G17767G1849G1856共端G452利用S0G794S7和OUTG5353G13459G2499G1209完成G17767G1849/G17767G1998G452（2）CD4051原理G3324用作8G178851G8181擬多路開G1863時G712CD4051G73898G1022數(shù)據(jù)G17767G1849端G712G33243G1022G17885G6333G17767G1849端A、B、C的控制下G712從8G1022G8181擬開G1863G1025G17885G63331G1022G8181擬開G1863使G1055G4560通G712將G11468應的G17767G1849數(shù)據(jù)通G17819G4560通的G8181擬開G1863G17877到G1856共G17767G1998端G452CD4051G73891G1022G1856共G17767G1998端G712G5415該G17767G1849端為高電G5191時G712不論數(shù)據(jù)G17767G1849端和G17767G1998端如G1321變化G712G3324內(nèi)G18108的8G1022G8181擬開G1863G3355為G1863斷G10378G5589G452其G11507G1552表如表1所示G452表1CD4051G11507G1552表INHCBA所G17885通G179590000S00001S10111S7A122A123A124A125A126A127A128A124A129A130A131A132A133A134A135A136A13761S0G794S7G3355G7422G17885G10253G714控制程G5219（1）G9052G19512G6250G2172G5353G17227的G16835G5058和機G7812開G1863G12879G1296G712多路開G1863G3324通G17959切G6454時G1075存G3324G6250G2172G17819程G712G1262G1998現(xiàn)G11648變現(xiàn)象G452G14521此時采集多路開G1863G17767G1998信號G712G4613G2499G14033G5353G1849G5468G3835的G16835G5058G452G5445G2721測量結(jié)G7536的G1946G11842G5627G452G9052G19512G6250G2172的常用G7053法G7389兩種一種G7171用G11840G1226G7053法來實現(xiàn)G712G2375用RC濾波G3132G19512G6250G2172G727G2490一種G7171用G17731G1226G5322時的G7053法來G16311G1927G452G3324G7389微控制系統(tǒng)G1025G712G17731G1226G7053法較G11840G1226G7053法更G7186優(yōu)勢G452（2）G1946G11842定時實G19481應用G1025G712G19668要對多路信號G17839G15904G17842續(xù)采G7691G712并G1000G8611G8437采G7691的間G19560G1075G7389嚴格的要求G452這G4613要求控制G3132具G7389嚴格的定時機制G452實G17353G1025用定時G3132控制采G7691時G5219G452本設(shè)計G7171對32路G8181擬信號G17839G15904采集G712G8611路采集G20069率為125KHZG712G18039G1052系統(tǒng)總的采G7691G20069率為1253240KHZG712G1075G4613G7171400S切G6454一G8437通G17959G712采集一G1022數(shù)據(jù)G452G3324本設(shè)計的系統(tǒng)G1025G712只G19668要設(shè)計定時G3132G712實現(xiàn)400S定時G1025斷G712G3324G1025斷處理程G5219G1025采集數(shù)據(jù)G452G3324設(shè)計系統(tǒng)時G712設(shè)計定時G3132400S定時G1025斷G712具體程G5219如G19480G54171所示G452222前置放大電路傳感G3132G7828測G1998的信號一般G7171微G5381的G712不G14033G11464G6521用G1122G7186示、G16772G5417、控制或G17839G15904A/DG17728G6454G452G3252此G712G3324G17839G15904非電量到電量G17728G6454G1055后G712G19668要將信號G6930G38354G452G11013G1122G2081G13634G6930G3835G3132要求G17767G1849G19471G6251高G712G9430G12239G1314、共G8181G6245制比G3835G712所G1209本設(shè)計G17885用高G19471G6251、G1314G9430G12239的運G12651G6930G3835G3132AD521作為G2081G13634G6930G3835G3132G452AD521G6930G3835G3132的簡化原理如圖2所示G452A138A139A140A141A142A143A144A140A145A146A147A148A149A150A151A152A1537圖2AD521簡化原理圖工作原理G5058G2010G17767G1849電壓VI加G3324G3818G6521電G19471RG兩端G712G3324RGG990G1147生的不G5191G15925電流IVI/RGG727流G17819G7242體G12661BG1和BG2G712G11013G1122G7242體G12661BG3和BG4為G19248象電流源所G1571G13634G712G17855使流G17819BG3和BG4集電G7509的電流G11468等G452G3252此G11013G5058G2010G17767G1849電壓所G1147生的不G5191G15925電流流G17819G2490一G1022G3818G6521電G19471RSG712G11013G1122G2465饋G6930G3835G3132的作用G712該G6930G3835G3132的G17767G1998電壓VO和電G19471RS兩端的電壓G1457G6357G11468等G712G3252此G2499得GSIORRVV21G2375G6930G3835G3132的G6930G3835G1505數(shù)的計G12651G1856式為22所示GSIORRVVG22G2499見G712只要適G5415改變RS/RGG1055比G1552G2375G2499改變G6930G3835G3132G3698益G452其G6930G3835G1505數(shù)G2499G332411000的G14551G3272內(nèi)G16855G6984G452作為一G1022G12946密的儀用G6930G3835G3132G712AD521僅G7389兩只G3698益G16855G6984電G19471RG和RSG712通G17819G16855G6984RG和RS的G19471G1552G712G2499使G6930G3835G3132G332401G7941000G3698益G1552G14551G3272內(nèi)G2474得任意G1552G712電G19471RG和RSG1055比率的G16855G6984不G1262G5445G2721AD521的高CMR（達120DB）G712或高G17767G1849G19471G6251（3109G8443G3994）G452此G3818G712AD521與G3835多數(shù)G11013單G1022運G6930組成的儀用G6930G3835G3132的不G2528G9869G7171IX1A154A155VO/RSBG4BG3BG12I2IA156A157A158A159A160UUA161A162A163IVI/RGIVI/RRGVI/RGA164IRSIX2IIA165A166A167VIA168A169A170A171A172A173A174A170A175A176A177A178A179A180A181A182A1838（1）不G19668要采用G12946密匹配的G3818G6521電G19471G452（2）G17767G1849端G2499承受的G5058G2172G17767G1849電壓G2499達30VG712G7389較強的G17819G17745G14033力G452（3）對G2520G1022G3698益段G3355G17839G15904G1114內(nèi)G18108補償G712并具G7389優(yōu)良的G2172G5589特G5627G712其G3698益帶寬達40MHZG452AD521G6930G3835G3132的G1868型G3818G18108G6521G13459圖如圖3所示G452G5353G14062OFFSET4G7126用G1122G16855G6984G6930G3835G3132零G9869G712G16855G6984G13459路G7171芯片4G7126G6521到10G2327G8443G3994電G1313G3132的兩G1022固定端G712電G1313G3132滑G2172端G6521G17139電源UG140625G452G5353G14062RG2G71214）用G1122G3818G6521電G19471RGG712電G19471RG用G1122G16855G6984G6930G3835G1505數(shù)G452G535