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1、Maxim>AppNotes>INTERFACECIRCUITSUARTsKeywords:UART,SPI,QSPI,MAX3100,IrDA,FIFO,universalasynchronousreceivertransmitterMar15,2000APPLICATIONNOTE691NewICCapsTwoDecadesofUARTDevelopmentAbstract:Maximhasintroducedatinyuniversalasynchronousreceiver/transm
2、itter(UART)thatiscompatiblewiththeminiatureelectroniccomponentsintoday'sportableproducts.Comparedwithwell-establishedUARTsalreadyonthemarket,thenewMAX3100offersnumerousadvantages:lowercost,higherspeed(to230kbaud),lowerpowerandlowervoltageoperation(<3
3、V),andspecialfeaturesthatincludeIrDAtimingforIRcommunicationsandaFIFObuffertorelievetheprocessingburdeninsmallsystems.Tohelpminimizesizeandpincount,theMAX3100featuresasynchronousserialperipheralinterface(SPI)forcommunications.Thereasonthatsuchanexten
4、siveinventoryofUARTsstillfailstomeeteverymodernrequirementliesintheincrementalnatureofUARTdevelopment.Inthisarticle,wereviewtheUARTintermsofitsmajortechnicaldevelopments,marketevolution,andcurrenttrends.Maximhasintroducedatinyuniversalasynchronousrec
5、eiver/transmitter(UART)thatiscompatiblewiththeminiatureelectroniccomponentsintoday'sportableproducts.Comparedwithwell-establishedUARTsalreadyonthemarket,thenewMAX3100offersnumerousadvantages:lowercost,higherspeed(to230kbaud),lowerpowerandlowervoltage
6、operation(<3V),andspecialfeaturesthatincludeIrDAtimingforIRcommunicationsandaFIFObuffertorelievetheprocessingburdeninsmallsystems.Althoughmorethan40UARTdevicesareavailabletoday,theyeitherfailtosatisfysomerequirementsoftoday'sapplications,ortheysatisf
7、yrequirementsonlythroughunwelcometrade-offsinsize,power,orspeed.Maximhasidentifiedaneed—andamarketopportunity—foranewlydesignedUARTthatdirectlymeetstoday'sspeedandpowerrequirementsandoffersthelatestspecialfeatures,withoutunwieldyworkarounds.Oureffort
8、shaveresultedinanewUART,theMAX3100.ThereasonthatsuchanextensiveinventoryofUARTsstillfailstomeeteverymodernrequirementliesintheincrementalnatureofUARTdevelopment.Inthisarticle,wereviewtheUARTintermsofitsmajortechnicaldevelopments,marketevolution,andcu
