探索外文翻译

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1、探索外文翻译探索外文翻译___AT89CX051微控制器的模拟_数字变换导读：1microcontrollers.RCAnalog-to-DigitalConverterThisconversionmethodoffers.Anextremelyloe.Intheexamplepresentedbeloillivolts,accuracyissomee附录1外文文献及中文翻译Analog-to-DigitalConversionUtilizingtheAT89CX051MicrocontrollersTheAtmelAT8

2、9C1051andAT89C2051.microcontrollersfeatureon-chipFlash,loicrocontrollers.RCAnalog-to-DigitalConverterThisconversionmethodoffers.Anextremelyloe.Intheexamplepresentedbeloillivolts,accuracyissomeeissevenmillisecondsorless.Asshoethodrequiresonlyticrocontroller.Amicroc

3、ontrolleroutput(pin11),approximaygroundtoVCC,alternaychargesanddischargesthecapacitorconnectedtothenon-invertinginputoftheinternalparator(pin12).Themicrocontrollermeasuresthetimerequiredforthevoltageonthecapacitortomatchtheunknoeasuredtime.TheHP5082-7300LEDdisplay

4、sshoplementasimpleteter.Theresultoftheanalog-to-digitalconversionisdisplayedinvoltsandtenthsofavoltontheteterapplicationdoesnotutilizethefullresolutionoftheRCconversionsoftonstratethemethodasforatypicalcapacitorcharge/dischargecycleisshoeisgivenbytheexponentialequ

5、ation:VC=VCC(1-e-t/RC)(1)et,VCCisthesupplyvoltageandRCistheproductofthevaluesoftheresistorandcapacitor.NotethatvoltageisexpressedinVolts,timeinseconds,resistanceinOhmsandcapacitanceinFarads.TheproductRCisalsoknoeconstant”ofthe.Theissteepeste.Thefirstproblemethodis

6、thedifficultyofsolvingtheexponentialequationescale,theexponentialcurveappearsstraightovermuchofitslength,suggestingthatitmightbeapproximatedbyaline.Thisschemefailsduetothecontinuousvariationinslopeoverthelengthofthecurve,ptoteatVCC.Themicrocontrollerneednotsolveth

7、eexponen5探索外文翻译___AT89CX051微控制器的模拟_数字变换(2)导读：Thesecondproblemethodisthesubstantialerrorvariationsinponentvalues.Figure3shoeifalookuptableisusedtomappre-calculatedvaluestoeachsampledtimeinterval.Thisschemealloattedasrequiredbytheapplicationplifyingtheconversionsoft

8、metriesinthedatamaybeexploitedtoreducethesizeofthetable.Thesecondproblemethodisthesubstantialerrorvariationsinponentvalues.Figure3shometryofthecapacitor