四线电阻式触摸屏控制芯片的-研究与设计

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1、摘要AbstractAsMultimediaInformationQuerytechniquesusedmoreandmorefrequently,theTouch-controlAutomationServerprovidesUSconvenientservice．Sofar,theTouchScreenisthenewest,thesimplestandthemostconvenientcomputerinputdevice,meetingtherequirementofChineseMultimediaInformationQuery,andalsohasma

2、nyadvantagessuch笛sturdy,spacesaving,quickreactionandbeingeasytoexchangeete．Usingthistechnology,usersonlyneedtopressthescreenwiththeirfingersorotherobjectsgently,andthenthesystemcombinesthefingerlocationwiththecomputersoftwaretoselecttheinputinformation，makingtheinteractionsmorestraighf

3、forward．TheTouchScreenSystemiscomposedofthetouchscreenandthetouchscreencontroller．ThispaperfocusesonresearchanddesignoftheFour-wireResistiveTouchScreenControllerChip，whichhastwomainfunctions．Firstly,itcollectsthepress-pointvoltage，andthenconvertsthevoltagetodigitalcoordinatewhichissent

4、toCPU．Secondly,itfinishestheelectrodeswitch．Thepapermainlydescribesandresearchestheworkingprincipleandthealgorithmofsuccessive—approximationADC(SARADC)，whichisthemostimportantpartofthechip，andthenaself-calibrationpseudo-differentialinputSARADCisachieved，withitstransistorlevelcircuitind

5、etail，aresolutionof12bitandarateof125Ksps．ItUseSSMICO．18urn3．3VCMOSprocess，andparticularlyintroducesandderivestheintemalcouplingcapacitancecalibrationalgorithm．Verilogcodeandtransistor-leveldesignoftheelectrodeswitchcontrolcircuitarealsofinished．UsingCadencespectreverilogsimulator,this

6、paperachievesthedesignandsimulationofthewholeFour-wireResistiveTouchScreenControllerChip．Itsmaxaveragepowersupplycurrentislessthan341uAat3．3Vsupply．Itspowerdownpowersupplycurrentis5．07uAandintemalbuilt．incalibrationfunctionallowscode．errorrate雒lOW越1I．SB．KeyWords：TouchScreenControllerCh

7、ipSARADCSelf-calibrationalgorithmcode—errorrateⅡ目录第一章引言⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯1第一节触摸屏技术现况⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯1第二节四线电阻式触摸屏原理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．2第三节论文结构安排⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．3第二章触摸屏控制芯片概述⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．5第一节控制芯片结构⋯⋯．．．⋯⋯⋯⋯⋯⋯．．：：⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯5第二节芯片引脚设置及工作过程⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯