数显温度计设计指导

《数显温度计设计指导》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、数显温度计一•设计任务设计并制作一个数字温度计.二•基本原理参阅《电子技术实验教程》:P94《温度控制器的设计》:P147《数字电压表》原理框图三•设计指导1.温度传感器可选用AD5902.A/D及显示电路可选用:ICL7107,共阳极LED数码管3.ICL7107所需的・5V供电可用MAX7660,IMP660;所需参考电压可用LM336,LM385B4.运放选用精密运放:OP007,TLC2652.四•附元器件资料PinoutsICL7106,ICL7107(PDIP)TOPVIEWICL7106R.ICL7107R(PDIP)TOPVIEWV*D1C1B1

2、A1D2C2B2A2F2E2D3B3F3E3(1000)AB4POL(MINUS)(10s)(100s)四OSC1冏OSC2更]OSC337TEST蛮REFHI6毎]REFLO凹Cref*d翌]Cref・[I37]COMMONpTO3T]INHIn豹INLO^9]A-Z逻]BUFFpra27]INT55須V・1625]G2(10s)24]C3富A3>(100$)^G3)21]BP/GNDOSC1OSC2OSC3TESTREFHIREFLOCref*Cref-COMMONINHIINLOA-ZBUFFINTV-G2(10*s)C3(100*s)JA3G3BP/GN

3、DD2C2B2A2F2E2D3B3F3E3(10s)>(100s)(1000)AB4POL(MINUS)ICL7106,ICL7107(MQFP)TOPVIEWKzmHHtsnunN4nHHOJZ-nn-xznnM202Soo二.b^o-一♦43&一_一工-=0.1uF=047uF=0.22uF=100pF=0.02uF=24kQ=47kQ=100kQ=1kQ=1MQFIGURE2.ICL7107TESTCIRCUITANDTYPICALAPPLICATIONWITHLEDDISPLAYCOMPONENTSSELECTEDFOR200mVFULLSCALERin

4、t='、'NFS•iNTCINT=(tNT)(I

5、N")ViNTDesignInformationSummarySheet•OSCILLATORFREQUENCYfosc=0.45/RCCose>5OpF;Rose>50k。foscOyP)=48kHz•OSCILLATORPERIODtosc=RC/0.45•INTEGRATIONCLOCKFREQUENCY『CLOCK=(OSc/4•INTEGRATIONPERIODtNT=1000X(4/fosc)•60/50HZREJECTIONCRITERIONt【NT他ohnorWnt他3Hz二Integer•OPT

6、IMUMINTEGRATIONCURRENTIint=4“•FULLSCALEANALOGINPUTVOLTAGEV

7、NFSGYP)=200mVor2V•INTEGRATERESISTOR•INTEGRATECAPACITOR•INTEGRATOROUTPUTVOLTAGESWING-(t

8、NT)“INT)，NT■ClNT•VINTMAXIMUMSWING：(V-+0.5V)vV,NT<(V+・0.5V),V)NT(T/p)=2V•DISPLAYCOUNTCOUNT=1000x•CONVERSIONCYCLEtcYC=fcLOCKX4000tcYC=t°scx1

9、6,000whenfosc=48kHz;tcyc=333ms•COMMONMODEINPUTVOLTAGE(V-*1V)

10、6POWERSUPPLY：SINGLE9VV+・M=9VDigitalsupolyisgeneratedinternallyVGnd=v*-4.5V•ICL7106DISPLAY：LCDType:Directdrivewithdigitallogicsupplyamplitude.•ICL7107POWERSUPPLY：DUAL±5.0VV*=*5VtoGNDV=・5VtoGNDDigitalLogicandLEDdriversupplyV+toGND•ICL7107DISPLAY：LEDType:Non-MultiplexedCommonAnodeTOPIN1

11、41kQ丰0.1uF10