ads技術(shù)ts08nt深圳市奧偉斯科技

General8-ChannelcapacitivesensorwithautosensitivitySelectableoutputoperation(singleormultioutputLowcurrentUniformlyadjustable2stepSyncfunctionforparallelAdjustableinternalfrequencywithexternalSelectablesenselineimpedanceoutofOpen-draindigitalEmbeddedcommonandnormalnoiseeliminationRoHScompliant24SOPand32QFNHomeMembraneswitchSealedcontrolpanels,Doorkey-lockmatrixTouchscreenreplacementPackage(24SOP/DrawingsnottoADSemiconductorADSemiconductor 1/Pin24SOP1AnalogCH6capacitivesensor2AnalogCH7capacitivesensor3AnalogCH8capacitivesensor4Analog3stepsensitivitylevel5---6Supply7DigitalSystemreset(High8DigitalCH1output(Open9DigitalCH2output(OpenDigitalCH3output(OpenDigitalCH4output(OpenDigitalCH5output(OpenDigitalCH6output(OpenDigitalCH7output(OpenDigitalCH8output(OpenDigitalSenselineimpedance(NoteOutputmode(SingleOutput/MultiOutput)(Note2)Syncpulseinput/outputPowerAnalogCH1capacitivesensorAnalogCH2capacitivesensorAnalogCH3capacitivesensorAnalogCH4capacitivesensorAnalogInternalbiasadjustAnalogCH5capacitivesensorNote1:Referto6.7IMP_SEL(SenseLineImpedance)Note2:Referto6.4SYNC/OPT32QFNPIN1AnalogInternalbiasadjust2Analog-3AnalogCH5capacitivesensor4AnalogCH6capacitivesensor5AnalogCH7capacitivesensor6AnalogCH8capacitivesensor7Analog3stepsensitivitylevel8-No-9-No--No--No--No-Supply-NoConnection(Note--No-DigitalSystemreset(HighDigitalCH1output(OpenDigitalCH2output(OpenDigitalCH3output(OpenDigitalCH4output(Open-No-DigitalCH5output(OpenDigitalCH6output(OpenDigitalCH7output(OpenDigitalCH8output(OpenDigitalSenselineimpedance(NoteOutputmode(SingleOutput/MultiOutput)(Note2)Syncpulseinput/outputPowerAnalogCH1capacitivesensorAnalogCH2capacitivesensorAnalogCH3capacitivesensorAnalogCH4capacitivesensorNote3:DUMMYpinshouldbenoAbsoluteMaximumBatterysupplyvoltage Maximumvoltageonanypin MaximumcurrentonanyPAD100mAPowerDissipation StorageTemperature OperatingTemperature -20~75℃JunctionTemperature NoteUnlessanyothercommandisnoted,allaboveareoperatedinnormalESD&Latch-upESDPos/PtoPos/PtoPos/Latch-upTestI-VsupplyoverElectricalCharacteristicsTestOperatingsupplyVCurrentVDD=3.3V-?VDD=5.0V-OutputmaximumTA=--?Sense-?Senseinput-ΩMinimumdetectiveCs=10pF,CDEGShortto--?Cs=10pF,CDEG--(opendrain)ΔC>0.2pF,Cs=CDEG=--ΩΔC<0.2pF,Cs=CDEG=--SelfcalibrationtimeaftersystemresetVDD=3.3VRB=--VDD=5.0VRB=--resistancerangeVDD=VDD=VDD=Maximum-Recommendedresistance12SensitivitylevelHigh?NormalNote4:ThesensitivitycanbeincreasedwithlowerCSTherecommendedvalueofCSis10pFwhenusing3TPC(PolyCarbonatecoverand10㎜x7㎜touchpattern.Note5:ThelowerRBisrecommendedinnoisyTS08NR_BIASR_BIASTheR_BIASisconnectedtotheresistortodecidetheoscillatorandinternalbiascurrent.Thesensingfrequency,internalclockfrequencyandcurrentconsumptionarethereforeabletobeadjustedwithRB.AvoltagerippleonR_BIAScanmakecriticalinternalerror,soCBisconnectedtotheVDD(notGND)isrecommended.(ThetypicalvalueofCBis820pFandthemaximumValueis1nF.)IDDB BNormaloperationcurrentconsumptionThecurrentconsumptioncurveofTS08NisrepresentedinaccordancewithRBvalueasabove.ThelowerRBrequiresmorecurrentconsumptionbutitisrecommendedinnoisyapplication.Forexample,refrigerator,airconditionerandsoon.CSCS8 TouchCS1

TouchTheparallelcapacitorCS1isaddedtoCS1andCS8toCS8toadjustsensitivity.ThesensitivitywillbeincreasedwhensmallervalueofCSisused.(RefertothebelowSensitivityExampleFigure)Itcouldbeusefulincasedetailsensitivitymediationisrequired.TheTS08NhasthreestepssensitivityanditisavailabletocontrolwithCDEGpin.(Referto6.3CDEGimplementationchapters)TheTS08NhaseightindependenttouchsensorinputfromCS1toCS8.Theinternaltouchdecisionprocessofeachchannelisseparatedfromeachother.ThereforeeightchanneltouchkeyboardapplicationcanbedesignedbyusingonlyoneTS08Nwithoutcouplingproblem.TheRSisserialconnectionresistortoavoidmal-functionfromexternalsurgeandESD.(Itmightbeoptional.)From200Ωto1kΩisrecommendedforRS.ThesizeandshapeofPADmighthaveinfluenceonthesensitivity.ThesensitivitywillbeoptimalwhenthesizeofPADisapproximatelyanhalfofthefirstknuckle(it’sabout10㎜ｘ7TheconnectionlineofCS1andCS2totouchPADisrecommendedtoberoutedasshortaspossibletopreventfromabnormaltouchdetectcausedbyconnectionline.SensitivityexamplefigureatHighCDEGCDEG N.C.:NormalCDEG GND:HigherTheTS08Nhasinternalthresholdlevelstodetectthecapacitancevariationforthedecisionoftouching.TheoneoftwostepsensitivityisdecidedbyCDEGpinconnection.ThesensitivityisdecidedbyCDEGpinasbelowtable.ThehighsensitivityisnotrecommendedinnoisyCDEGConnectionvs.SensitivityCDEGNotConnecttoSYNC/OPTSingleThispinwillbeassignedfortheoutputoptionselection.ItwilldecidethatTS08Nisworkingonsingleormultitouchdetectionmode.Itshouldbeimplementedasbelowforthese.SYNC/OPT(SingleModeSYNC/OPT

(MultiModeMultiOvertwoTS08NcanworkontheoneapplicationatthesametimethankstoSYNCfunctionwiththispin.TheSYNCpulsepreventsovertwosensingsignalfrominterferingwitheachother.RSYNCispull-downresistorofSYNC/OPTpin.ToobigvalueofRSYNCmakestheSYNCpulsefallingdelay,andtoosmallvalueofRSYNCmakesrisingdelay.TypicalvalueofRSYNCis2MΩ.TheSyncpinshouldbeimplementedasbelow.TheTS08NcanalsobeusedwiththeotherTSxxseriesbyemployingthisSYNCfunction.TheTS08Ncouldonlyoperateonmultioutputmodeinthisconfiguration.SYNC/OPT1st2ndTS08NorRESETTS08Nhasinternaldatalatches,soinitialstateoftheselatchesmustberesetbyexternalresetpulsebeforenormaloperationstarts.TheresetpulsecanbecontrolledbyhostMCUdirectlyorotherresetdevice.Ifnot,thecircuitshouldbecomposedasbelowfigure.TheresetpulsemusthavehighpulsedurationaboutafewmsectocoverpowerVDDrisingtime.TherecommendedvalueofRRSTandCRSTare330KΩand100nF.RESETRecommendedresetcircuitsThebetterperformanceiswarrantedwithbelowresetcircuit.TheQ1isturnedonandmakesresetpulsewhenpowerisonandVDDisraisedtooperatingvoltage.Afterafewmsec(durationtimeisdeterminedbyR7,R8,C5),Q1isturnedoffandTS08Ncanbeoperatedwithnormalsensitivity.RecommendedresetcircuitsOutputCircuit

TheOUTPUTpinshaveanopendrainstructure.Forthisreason,theconnectionofpull-upresistorROUTisrequiredbetweenOUTPUTandVDD.Themaximumoutputsinkcurrentis4mA,sooverafewkΩmustbeusedasROUT.Normally10kΩisusedasROUT.TheOUTPUTishighinnormalsituation,andthevalueislowwhenatouchisdetectedonthecorrespondingCS.IMP_SEL(SenseLineImpedance)IMP_SEL(SenseLineLowImpedanceIMP_SEL(SenseLineHighImpedanceThesenseinputimpedancemightbeselectedbytheIMP_SELpin.Incaseofmultichanneltouchsensorapplication,thesenselinescouldbedrawingsidebysidewithverysmallgap.Inthiscase,thesensitivitycouldbeaffectedbytheneighborchannelduringoutofscanning.ThereforetheconnectionofIM_SELpinisrecommendedtoconnectwithVDD(lowimpedancemode).Intheothercase,thehighimpedancemode(connectionwithGND)hasanadvantageforsensitivity.RecommendedCircuitTheVDDperiodicvoltagerippleover50mVandtheripplefrequencyislowerthan10kHzcancausewrongsensitivitycalibration.Topreventaboveproblem,power(VDD,GND)lineofTS08Nshouldbeseparatedfromothercircuit.EspeciallyLEDdriverpowerlineordigitalswitchingcircuitpowerlinecertainlyshouldbetreatedtobeseparatedfromthatofTS08N.WhenTS08Nusedinnoisyenvironment,lowerRBresistorisInPCBlayout,RBIASpatternshouldnotbeplacedontouchpattern.Ifnot,CBhastobeconnected.TheRBIASpatternshouldberoutedasshortaspossible.TheCSpatternsalsoshouldberoutedasshortaspossibleandthewidthofthelinemightbeabout0.25mm.TheCSpatternroutingshouldbeformedbybottommetal(oppositemetaloftouchThecapacitorthatisbetweenVDDandGNDisanobligation.ItshouldbelocatedascloseaspossiblefromTS08N.TheemptyspaceofPCBmustbefilledwithGNDpatterntostrengthenGNDpatternandtopreventexternalnoisefrominterferewithsensingfrequency.ThesensitivitycanbechangedbyconnectionofCDEG.(See6.3CDEGimplementationchapter)TheTS08NisresetifRESETpinishigh.(See6.5Resetimplementationchapter)TheOUT1~OUT8areopendrainoutputports.Thereforethepull-upresistorshouldbeneededasabovefigure.TheTS08NisworkingwithsingleoutputmodeifSYNCpinishighanditwillbeinmultioutputmodewhenSYNCpinislow.Theresistor(2MΩ)whichisconnectedSYNCpintoGNDisrequiredforSYNCoperation.(See6.4SYNC/OPTimplementation)UnusedCSpinsmaybeconnectedtoGNDforstableoperation.InthatcaseTS08Noperatesinfastsensingmodeandneedsmorecurrent.T4T3T2PadPadPad1111 1111

RS4RS3RS220020020000

OUT8

011RS51RS61RS71RS800

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OUT7OUT6OUT5N.C.OUT4OUT3OUT2OUT1

OUT7OUT7OUT6OUT6OUT5OUT4OUT4OUT3OUT3OUT2OUT2OUT199

TS08N(8-CHTS08N(8-CHAutoSensitivityCalibrationCapacitiveTouchTS08N(32QFN)ApplicationExample14/ 00Example–PowerLineSplitStrategyPCBNotsplitpowerLine(BadpowerlineThenoisethatisgeneratedbyACloadorrelaycanbeloadedat5VpowerAbiginductancemightbeappearedincaseoftheconnectionlinebetweenmainboardanddisplayboardistoolong,moreoverthevoltageripplecouldbegeneratedbyLED(LCD)displaydriveratVDD(5V).SplitpowerLine(One5Vregulatorused)–SplitpowerLine(Separated5Vregulatorused)–StronglyADSemiconductor 15/MECHANICALMechanicalDrawing(24ADSemiconductor 16/MechanicalDrawing(32ADSemicondu