图图eisa配置

TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015TS3A227E车车用用音音频频附件检检测测和和配配置置开开关关1特特性性3说说明明1电源电压范围为2.
5V至4.
5VTS3A227E是一款音频自主检测和配置开关,用于检测3孔或4孔音频并配置内部开关,以便进具有防反跳可调定时功能的插入/移除检测行信号传输.
配置检测:–立体声3孔耳机TS3A227E的内部接地FET具有60mΩ超低RON,能–麦克风(MIC)连接Sleeve的4孔标准耳机够最大限度地减少串扰影响.
接地FET也可用于传送–MIC连接Ring2的4孔国际标准(OMTP)耳机FM信号,因此,可以使用的接地线作为移动音频可对多达4个按键进行按压检测应用中的FM天线.
超低接地场效应晶体管(FET)导通电阻RON,仅为利用内部隔离开关,TS3A227E可以消除插入或移除60mΩ音频时可能产生的卡嗒/爆裂噪音.
此外,器件中断电后可消除噪声的耗尽型FET可防止器件未通电时出现悬空接地,并隔离音频插孔的麦克风偏置电压(MICBIAS),消除防止将插入未通电系统时产生嗡嗡声.
卡嗒/爆裂噪音集成编解码器感测线路当没有插入耳机时,低功耗睡眠模式可将部分内部电路手动I2C控制关断,以实现极低的静态电流和功耗.
调频(FM)传输能力TS3A227E具有集成按键按压检测功能,最多可检测4两种小型封装选项个按键的按压和释放操作.
–16引脚芯片尺寸球状引脚栅格阵列(DSBGA)封装手动I2C控制可控制防反跳设置和开关状态,从而使–16引脚四方扁平无引线(QFN)封装TS3A227E适应应用需求.
2应应用用范范围围器器件件信信息息(1)器器件件型型号号封封装装封封装装尺尺寸寸((标标称称值值))移动电话QFN(16)3.
50mmx3.
50mm平板电脑TS3A227EDSBGA(16)1.
79mm*1.
79mm笔记本电脑和超级本(1)要了解所有可用封装,请见数据表末尾的可订购产品附录.
使用3.
5mm音频接口的任意应用4简简化化电电路路原原理理图图1PRODUCTIONDATAinformationiscurrentasofpublicationdate.
ProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
EnglishDataSheet:SCDS358TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
ti.
com.
cn目目录录9.
2FunctionalBlockDiagram181特特性性.
19.
3FeatureDescription.
192应应用用范范围围.
19.
4DeviceFunctionalModes.
203说说明明.
19.
5RegisterMaps244简简化化电电路路原原理理图图.
19.
6RegisterFieldDescriptions245修修订订历历史史记记录录210ApplicationandImplementation.
336PinConfigurationandFunctions.
310.
1ApplicationInformation.
337Specifications.
410.
2TypicalApplication337.
1AbsoluteMaximumRatings411PowerSupplyRecommendations477.
2ESDRatings412Layout.
487.
3RecommendedOperatingConditions.
512.
1LayoutGuidelines487.
4ThermalInformation.
512.
2LayoutExample(QFN)487.
5ElectricalCharacteristics.
612.
3LayoutExample(DSBGA)497.
6I2CInterfaceTimingCharacteristics813器器件件和和文文档档支支持持507.
7TimingDiagrams.
913.
1商标.
507.
8TypicalCharacteristics.
1213.
2静电放电警告.
508ParameterMeasurementInformation1213.
3术语表509DetailedDescription1714机机械械封封装装和和可可订订购购信信息息509.
1Overview175修修订订历历史史记记录录ChangesfromRevisionA(December2014)toRevisionBPageAddedDSBGApackagetotheThermalInformationtable.
5UpdatedSWITCHRESISTANCEfortheDSBGApackage.
6ChangesfromOriginal(July2014)toRevisionAPage最初发布的完整版文档.
12Copyright2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY20156PinConfigurationandFunctionsDSBGA–YFFQFN–RVATopViewTopViewPinFunctionsPINTYPEDESCRIPTIONNAMERVAYFFAfallingedgefromhightolowonthispintriggersaccessorydetection.
ThispincanbeconnectedtheDET_TRIGGER15B1I/Oheadsetjacktoallowautomaticpull-downtogroundafterheadsetinsertiontoinitializedetection.
GND1,2A2,B2GNDPrimarygroundconnectionfortheTS3A227E.
Mustbeconnectedtosystemground.
GroundconnectionfortheinternalgroundFETsoftheTS3A227E.
IfFMisbeingsupportedconnectthispinGNDA11D2I/OtotheFMmatchingnetwork.
IfFMisnotbeingsupportconnectthispintosystemground.
GND_SENSE5A4I/OGroundsenselineforthecodec.
OpendraininterruptoutputfromtheTS3A227Etonotifythehostthataneventhasoccurred.
IfI2CisnotINT13C2GNDusedthispinmustbegrounded.
MIC_PRESENT16A1I/OOpendrainoutputtoindicatetothehostthataheadsetwithamicrophoneisinserted.
.
MICP6B4I/OMicrophonesignalconnectiontothecodec.
Microphonebiasisappliedtothispin.
HeadsetcurrentreturnpathifRING2isgroundfortheheadset.
Connectto3.
5mmjackRING2connectionRING212D1OwithlowDCresistancetrace.
ConnectedtotheRING2pinofthe3.
5mmjack.
IfRING2pinonpluginisMICsignal,thisisconnectedtoRING2_SENSE7C4GNDMICP.
Ifnot,thisisconnectedtoGND_SENSEandbecomesthegroundsensingfeedbackfortheaccessorySCL9C3IClockfromI2Cbus.
ThiscanbeconnectedtoVDDifI2Cisnotused.
SDA3B3I/OBidirectionaldatafrom/toI2Cbus.
ThiscanbeconnectedtoVDDifI2Cisnotused.
HeadsetcurrentreturnpathifSLEEVEisGNDforheadset.
Connectto3.
5mmjackSLEEVEconnectionwithSLEEVE10D3OlowDCresistancetrace.
ConnectedtotheSLEEVEpinofthe3.
5mmjack.
IfSLEEVEpinonpluginisMICsignal,thisisconnectedtoSLEEVE_SENSE8D4GNDMICP.
Ifnot,thisisconnectedtoGND_SENSEandbecomesthegroundsensingfeedbackfortheaccessoryTheTHERMALPADoftheRVA–QFNpackagemustbeconnectedtoanyinternalPCBgroundplaneusingTHERMALPADGNDmultipleviasforbestthermalperformance.
TIP14C1I/OConnecttotheTIPpinofthe3.
5mmjack.
VDD4A3PWRPowerinputtotheTS3A227E.
Externalde-couplingcapacitorsarerequiredonthispin.
Copyright2014–2015,TexasInstrumentsIncorporated3TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cn7Specifications7.
1AbsoluteMaximumRatingsoveroperatingfree-airtemperaturerangereferencedwithrespecttoGND(unlessotherwisenoted)(1)MINMAXUNITInputVoltageVDD–0.
35VSDA,SCL,INT,MIC_PRESENT–0.
3VDD+0.
5VTIP–3.
3VDD+0.
5VDET_TRIGGER–2.
2VDD+0.
5VGND_SENSE,RING2,SLEEVE,RING2_SENSE,SLEEVE_SENSE,–0.
33.
6(2)andVDD+VMICP,GNDA0.
5ON-stateswitchCombinedcontinuouscurrentthroughR2GNDFETandSLVGNDFET500mAcurrentContinuouscurrentthroughR2DFETandSLVDFET50ContinuouscurrentthroughS120ContinuouscurrentthroughS220ContinuouscurrentthroughS3PR50ContinuouscurrentthroughS3PS50ContinuouscurrentthroughS3GR100ContinuouscurrentthroughS3GS100Operatingambienttemperaturerange–4085°CTstgStoragetemperaturerange–65150°C(1)StressesbeyondthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.
Thesearestressratingsonly,whichdonotimplyfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderRecommendedOperatingConditions.
Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
(2)Thisratingisexclusiveandthevoltageonthepinsmustnotexceedeither3.
6andVDD.
E.
g.
ifVDD=4.
5Vthevoltageonthepinmustnotexceed3.
6VandifVDDis=2.
5Vthevoltageonthepinmustnotexceed3.
0V.
7.
2ESDRatingsVALUEUNITHumanbodymodel(HBM),ESDstressvoltagenewnote#1totheESD±2000VRatingstableandcombinedMINMAXcolumntoVALUE(1)(2)V(ESD)ElectrostaticdischargeChargeddevicemodel(CDM),ESDstressvoltage(1)(3)±500VContactdischargemodel(IEC)ESDstressvoltageonTIP,±8000VDET_TRIGGER,RING2_SENSE,SLEEVE_SENSE,RING2,SLEEVE(1)(1)ElectrostaticDischarge(ESD)tomeasuredevicesensitivityandimmunitytodamagecausedbyassemblylineelectrostaticdischargesintothedevice(2)JEDECdocumentJEP155statesthat500-VHBMallowssafemanufacturingwithastandardESDcontrolprocess.
(3)JEDECdocumentJEP157statesthat250-VCDMallowssafemanufacturingwithastandardESDcontrolprocess.
4Copyright2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY20157.
3RecommendedOperatingConditionsoveroperatingfree-airtemperaturerange(unlessotherwisenoted)MINMAXUNITVDDPowersupplyvoltagerange2.
54.
5VSDA,SCL0VDDVVIDigitalinputvoltagerangeDET_TRIGGER–2.
2VDDVRING2_SENSE,SLEEVE_SENSE,RING2,03.
3(1)andVDDSLEEVE,GND_SENSE,MICPVIOInput/outputvoltagerangeVTIP–3VDDVOOutputvoltagerangeINT,MIC_PRESENT0VDDVSDA,SCL1.
2VDDVVIHInputlogichighDET_TRIGGER0.
65*VDDVDDVSDA,SCL00.
4VVILInputlogiclowDET_TRIGGER00.
4*VDDVTAOperatingambienttemperature–4085°C(1)Thisratingisexclusiveandthevoltageonthepinsmustnotexceedeither3.
3andVDD.
E.
g.
ifVDD=4.
5Vthevoltageonthepinmustnotexceed3.
3VandifVDDis=2.
5Vthevoltageonthepinmustnotexceed2.
5V.
7.
4ThermalInformationTS3A227ETS3A227ETHERMALMETRIC(1)RTEYFFUNIT16PINS16PINSRθJAJunction-to-ambientthermalresistance45.
977.
9RθJC(top)Junction-to-case(top)thermalresistance52.
60.
6RθJBJunction-to-boardthermalresistance21.
212.
5°C/WψJTJunction-to-topcharacterizationparameter0.
92.
3ψJBJunction-to-boardcharacterizationparameter21.
212.
5RθJC(bot)Junction-to-case(bottom)thermalresistance4.
3-(1)Formoreinformationabouttraditionalandnewthermalmetrics,seetheICPackageThermalMetricsapplicationreport,SPRA953.
Copyright2014–2015,TexasInstrumentsIncorporated5TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cn7.
5ElectricalCharacteristicsUnlessotherwisenotedthespecificationappliesovertheVDDandambientoperatingtemperaturerange.
PARAMETERTESTCONDITIONSMINTYPMAXUNITSUPPLYVOLTAGEVDDSupplyvoltage2.
53.
34.
5VNoaccessoryinserted.
I2Cbusinactive(1)0.
510AVDD=2.
5Vto4.
5VManualswitchcontrol='1',I2Cbusinactive,(1)715AVDD=2.
5Vto4.
5V,DepletionFETsonManualswitchcontrol='1',I2Cbusinactive,2040AVDD=2.
5Vto4.
5VDepletionFETsoff3-poleaccessoryinserted.
1120AI2Cbusinactive(1),FMSupport='0'IDDQuiescentcurrentVDD=2.
5Vto4.
5V3-poleaccessoryinserted.
2545AI2Cbusinactive,(1)FMSupport='1'VDD=2.
5Vto4.
5V4-poleAccessoryinserted.
2540AI2Cbusinactive,(1)VDD=2.
5Vto4.
5V4-poleAccessoryinserted.
KPdetectionenabled3045AI2Cbusinactive,(1)VDD=2.
5Vto4.
5VNoaccessoryinserted.
QuiescentcurrentadditionfromusingaIDD_1.
818AI2Cbusinactiveat1.
8V,(3)1.
8VI2Cbus.
(2)VDD=2.
5Vto4.
5VSWITCHRESISTANCERING2GNDFETonresistance(DSBGA4085Package)RR2GNDFTRING2GNDFETonresistance(QFN6095Package)VDD=3.
3V,VGND=0V,mΩIGNDA=75mASLEEVEGNDFETonresistance(DSBGA4085Package)RSLVGNDFTSLEEVEGNDFETonresistance(QFN6095Package)RS3PSS3PSonresistanceVDD=3.
3V,36.
5VSLEEVE_SENSE/RING2_SENSE=0Vto2.
7V,ΩRS3PRS3PRonresistance36.
5IMICP=±10mARS3GSS3GSonresistanceVDD=3.
3V,0.
51VSLEEVE_SENSE/RING2_SENSE=0Vto2.
7V,ΩRS3GRS3GRonresistance0.
51IGND_SENSE=±75mARS1Switch1onresistance1530ΩRS2Switch2onresistance1530VDD=3.
3V,IGND=10mARR2DFETRING2depletionFETonresistance75150ΩRSLVDFETSLEEVEdepletionFETonresistance75150SWITCHLEAKAGECURRENTRING2pinoffleakage1SLEEVEpinoffleakage1RING2_SENSEpinoffleakage1IOFFVIN=0Vto3.
3V,VDD=3.
3VASLEEVE_SENSEpinoffleakage1MICPpinoffleakage1GND_SENSEpinoffleakage1IONS2PS,S3PR,S3GS,S3GRonleakageVSLEEVE/RING2=0V,VDD=3.
3V1A(1)TheI2CbusisinactiveifboththeSDAandSCLlinesaretiedtoVDD.
(2)IftheI2Cbusisoperatingat1.
8VtheIDD_1.
8currentnumberwillbeinadditiontotheothercurrentconsumptionnumbersspecified.
(3)TheI2CbusisinactiveifboththeSDAandSCLlinesaretiedto1.
8V.
6Copyright2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015ElectricalCharacteristics(continued)UnlessotherwisenotedthespecificationappliesovertheVDDandambientoperatingtemperaturerange.
PARAMETERTESTCONDITIONSMINTYPMAXUNITSWITCHTIMINGVDD=2.
5V,3.
3V,4.
5V,RL=300Ω,CL=50pFTurnofftimeforS3PS,S3PR,S3GS,5sS3GRVSLEEVE_SENSE/RING2_SENSE=2.
5V(VDD=2.
5V),3.
3V(VDD=3.
3V,VDD=4.
5V)VDD=2.
5V,3.
3V,4.
5VRPU=1500Ω,CL=50pFTurnofftimeforS1,S2,RING2GNDFET,tOFF5sSLEEVEGNDFETVPU=2.
5V(VDD=2.
5V),3.
3V(VDD=3.
3V,VDD=4.
5V)VDD=2.
5V,3.
3V,4.
5VRPU=1500Ω,CL=50pFTurnofftimeforRING2DFETand500sSLEEVEDFETVPU=2.
5V(VDD=2.
5V),3.
3V(VDD=3.
3V,VDD=4.
5V)VDD=2.
5V,3.
3V,4.
5VRL=300Ω,CL=50pFTurnontimeforS3PS,S3PR,S3GS,1sS3GRVSLEEVE_SENSE/RING2_SENSE=2.
5V(VDD=2.
5V),3.
3V(VDD=3.
3V,VDD=4.
5V)VDD=2.
5V,3.
3V,4.
5VRPU=1500Ω,CL=50pFTurnontimeforS1,S2,RING2GNDFET,tON35sSLEEVEGNDFETVPU=2.
5V(VDD=2.
5V),3.
3V(VDD=3.
3V,VDD=4.
5V)VDD=2.
5V,3.
3V,4.
5VRPU=1500Ω,CL=50pFTurnontimeforRING2DFETand1sSLEEVEDFETVPU=2.
5V(VDD=2.
5V),3.
3V(VDD=3.
3V,VDD=4.
5V)DIGITALI/OMIC_PRESENTlowleveloutputvoltage00.
4VDD=3.
3V,IOL=10mAVOLINTlowleveloutputvoltage00.
4VSDAlowleveloutputvoltageVDD=3.
3V,IOLMAX=3mA00.
4SDA,SCL1.
2VDDVIHInputlogichighVVDDxDET_TRIGGERVDD0.
65SDA,SCL00.
4VILInputlogiclowDET_TRIGGER0VDDx0.
4InternalDET_TRIGGERpull-upRPU/DTVDD=3.
3V,I/DET_TRIGGER=1A0.
511.
85MΩresistanceCopyright2014–2015,TexasInstrumentsIncorporated7TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cnElectricalCharacteristics(continued)UnlessotherwisenotedthespecificationappliesovertheVDDandambientoperatingtemperaturerange.
PARAMETERTESTCONDITIONSMINTYPMAXUNITDYNAMICCHARACTERISTICSVDD=3.
3V±200mVPP,f=217Hz,RLatPSR217–95–120RING2=50ΩVDD=3.
3V±200mVPP,f=1kHz,RLatPSR1kPowersupplyrejection–85–110dBRING2=50ΩVDD=3.
3V±200mVPP,f=20kHz,RLatPSR20k–70–90RING2=50ΩSLEEVE_SENSEorRING2_SENSEtoISOS3VIN=200mVPP,f=20Hz–20kHz,RL=50Ω–90dBMICPIsolationSLEEVE_SENSEtoRING2_SENSESEPS3VIN=200mVPP,f=20Hz–20kHz,RL=50Ω–75dBSeparationBWBandwidththroughGNDFETsVIN=60mVPP,IBIAS=10mA120150MHzVIN=1.
5V+200mVPP,f=20Hz–20kHz,THD2000.
003%MICPtoRING2_SENSEorRS=600Ω,RL=600ΩSLEEVE_SENSEtotalharmonicVIN=1.
5V+500mVPP,f=20Hz–20kHz,distortionTHD5000.
002%RS=600Ω,RL=600ΩVIN=1VRMS,f=20Hz–20kHz,MICPtoRING2_SENSEorSNR–90–110dBSLEEVE_SENSEsignaltonoiseratioRS=600Ω,RL=600ΩTimebetweenDET_TRIGGERtransitionfromtDETDetectionsequencedurationhightolowandINTtransitionfromhightolow.
175210msDefault90msinsertiondebounce.
TimefromVDD>2.
5VtillI2CcommunicationisTpower-upPoweruptimePower-uptime2025msreadyTimebetweenDET_TRIGGERtransitionfromtREMOVALRemovalwaitperiodlowtohighandRING2/SLEEVEDFETsturning5065mson7.
6I2CInterfaceTimingCharacteristicsUnlessotherwisenotedthespecificationappliesovertheVDDandambientoperatingtemperaturerangeSTANDARDMODEFASTMODEI2CUNITI2CBUSBUSPARAMETERMINMAXMINMAXfsclI2Cclockfrequency01000400kHztschI2Cclockhightime40.
6stsclI2Cclocklowtime4.
71.
3stspI2Cspiketime5050nstsdsI2Cserialdatasetuptime250100nstsdhI2Cserialdataholdtime00nsticrI2Cinputrisetime100021300nsticfI2Cinputfalltime30021300ns20+0.
1tocfI2Coutputfalltime;10pFto400pFbus300300sCbtbufI2CbusfreetimebetweenStopandStart4.
71.
3ststsI2CStartorrepeaterStartconditionsetuptime4.
70.
6ststhI2CStartorrepeaterStartconditionholdtime40.
6stspsI2CStopconditionsetuptime40.
6stvd(data)Validdatatime;SCLlowtoSDAoutputvalid3.
450.
30.
9sValiddatatimeofACKcondition;ACKsignalfromSCLlowtoSDAtvd(ack)3.
450.
30.
9s(out)lowCbI2Cbuscapacitiveloading04000400pF8Copyright2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY20157.
7TimingDiagramsA.
(ThisisthepointthatDET_TRIGGERhasstoppedglitchingandisfullylow.
Thede-bouncetimeof90msstartsfromthepointthatthepinisconstantlybelowtheVILlevel.
AnytimetheDET_TRIGGERpincrosstheVIHlevelthede-bouncetimerwillrestart.
B.
PointBistheendoftheinsertionde-bouncetimeandthebeginningofaccessorydetection.
C.
Detectionhascompletedatthispoint.
TheswitcheswillberoutedbeforetheINTpinispulledlow.
D.
INTisclearedafterthehostreadstheinterruptregister.
E.
Theheadsetisremovedhere.
TheswitchstateswillchangeimmediatelyandINTwillbepulledlow.
F.
Aftera50msremovalde-bouncetimertheTS3A227Ewillgobackintosleepmodeifmanualswitchcontrolisnotenabled图图1.
3-PoleAccessory版权2014–2015,TexasInstrumentsIncorporated9TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cnTimingDiagrams(接接下下页页)A.
ThisisthepointthatDET_TRIGGERhasstoppedglitchingandisfullylow.
Thede-bouncetimeof90msstartsfromthepointthatthepinisconstantlybelowtheVILlevel.
AnytimetheDET_TRIGGERpincrosstheVIHlevelthede-bouncetimerwillrestart.
B.
PointBistheendoftheinsertionde-bouncetimeandthebeginningofaccessorydetection.
C.
Detectionhascompletedatthispoint.
TheswitcheswillberoutedbeforetheINTandMIC_PRESENTpinsarepulledlow.
D.
INTisclearedafterthehostreadstheinterruptregister.
E.
Theheadsetisremovedhere.
TheswitchstateswillchangeimmediatelyandINTwillbepulledlow.
TheMIC_PRESENTpinwillbereleased.
F.
Aftera50msremovalde-bouncetimertheTS3A227Ewillgobackintosleepmodeifmanualswitchcontrolisnotenabled图图2.
4-PoleAccessory10版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015TimingDiagrams(接接下下页页)7.
7.
1RemovalAremovaleventwillinterruptanyon-goingprocessintheTS3A227E.
Thefollowingdiagramdepictshowthedevice"jumps"duringaremoval.
Iftheremovaleventoccursduringtheinsertionde-bounceperiodtheTS3A227Ewilljumptothe(A)pointofthediagramdepictedbythegreenarrowandline.
Anytimeafterpoint(B)hasbeenreachedandtheaccessoryisremovedthedevicejumpstopoint(E),whichincludeskeypressdetection.
UnderManualSwitchControltheswitchstateswillnotchange.
图图3.
RemovalTimingDuringInsertion版权2014–2015,TexasInstrumentsIncorporated11TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cn7.
8TypicalCharacteristics图图4.
S3PXTHD8ParameterMeasurementInformation图图5.
RING2/SLEEVEGNDFETOnResistanceMeasurement图图6.
RING2/SLEEVEDFETOnResistanceMeasurement12版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015ParameterMeasurementInformation(接接下下页页)图图7.
S1/S2OnResistanceMeasurement图图8.
S3PS,S3PR,S3GS,S3GROnResistanceMeasurement图图9.
SwitchOffLeakageCurrent版权2014–2015,TexasInstrumentsIncorporated13TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cnParameterMeasurementInformation(接接下下页页)图图10.
SwitchOnLeakageCurrent图图11.
PowerSupplyRejectionRatio(PSRR)图图12.
SwitchOffIsolation14版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015ParameterMeasurementInformation(接接下下页页)图图13.
ChannelSeparation图图14.
TotalHarmonicDistortion(THD)andSNR版权2014–2015,TexasInstrumentsIncorporated15TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cnParameterMeasurementInformation(接接下下页页)图图15.
S3tOFF/tON图图16.
S1,S2,GNDFETandDFETtON/tOFF16版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY20159DetailedDescription9.
1OverviewTheTS3A227Eisanautonomousaudioaccessoryswitchwithadjustablede-bouncesettings,ultra-lowRONgroundFETs,depletionFETsandmanualI2Ccontrol.
ThedetectionsequenceisinitiatedviatheexternalDET_TRIGGERpinorviaI2Ccommand.
Thedeviceincorporatesinternalde-bouncetimingsthatremovetheneedforexternalRCcircuits,reducingcostandoverallPCBfootprint.
AdditionallyallswitchesoftheTS3A227Eandtheinternalde-bouncetimingscanbecontrolledthroughI2C.
Beforeaninsertion,TS3A227EisolatestheMICBIASvoltageoutputfromtheaudiojacktoremoveclick/popnoisethatcanbecreatedduringaninsertionevent.
InadditionthedevicealsoincludesdepletionFETstogroundtheaccessorySLEEVEandRING2pinswhenVDDisnotpowered.
Thisremovesthehummingnoisethatcanbecreatedwhenplugginganaccessoryintoandunpoweredsystem.
TheTS3A227Edetectsthepresenceandconfigurationofthemicrophoneinanattachedheadsetuponinsertion.
UpondetectionofamicrophonetheTS3A227Eautomaticallyconnectsasystemanalogmicrophonepin(MICP)totheappropriateaudiojackconnection.
ThedevicealsoautomaticallyroutesthedeviceGNDApintotheheadsetground.
Aftera4-poleheadsetinsertionthehostcanenabletheKeyPressdetectionfeatureoftheTS3A227E.
Thedevicealsofeaturesanultra-lowpowersleepmodetoconservebatterylifewhenanaccessoryisnotinserted.
ForFMtransmissionthegroundFETsofthedevicecanbeusedasanFMtransmissionpathbyplacingtheFMreceiverandmatchingnetworkontheGNDApin.
TheFMsupportbitmustbesetto'1'throughI2CforFMtransmissiontopass.
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2FunctionalBlockDiagram18版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY20159.
3FeatureDescription9.
3.
1AccessoryConfigurationDetectionTherearecurrentlytwodifferenceconfigurationsforheadsetswithmicrophonesasshownin表1.
Manycodecsrequiresthatthesystemdesignermakeatoughdecisionviaahardwareconnectionwhichheadsettheywouldliketosupport.
Thisisdonebydirectlyconnectingthemicrophonebiasandthegroundconnectionstothesleeveandring2pinsoftheaudiojack.
Fortheenduserthisleavesaheadsetstandardasfullyunsupported.
表表1.
TwoDifferenceConfigurationsforHeadsetsPHYSICALCONNECTORINTERNALIMPEDANCENETWORKPINNAMECONFIGURATIONTipAudioLeftRingAudioRightSleeveGroundTipAudioLeftRing1AudioRightRing2GroundSleeveMicrophoneTipAudioLeftRing1AudioRightRing2MicrophoneSleeveGroundTheTS3A227EfillsthissystemgapbydetectingthepresenceandlocationofthemicrophoneandautomaticallyroutingtheMICBIASandgroundlinestosupporteachheadset.
Thisenhancestheoveralluserexperiencebyallowingheadsetsfromallmanufacturers.
9.
3.
2OptionalManualI2CControlTheTS3227EalsofeaturesoptionalmanualI2Ccontrolforenhancedsystemflexibility.
Thisallowsthesystemdesignertomanuallycontroltheswitchesandde-bouncesettingsattheirdiscretionenablingtheTS3A227Etoadapttouniqueusecases.
Thisisanoptionalfeaturethatdoesnotneedtobeusedforthedevicetooperateautonomously.
9.
3.
3AdjustableDe-bounceTimingsTheTS3A227Efeaturesmanualcontroloftheinsertionde-bouncetimerwithselectablevalues.
Thedefaultinsertionde-bouncetimeris90ms.
ThiseliminatestheneedforexternalRCcomponentswhichreducesBOMcost,thePCBfootprintoftheexternalRCcomponents.
Furtherinformationonhowtoselectanappropriatede-bouncetimercanbefoundintheapplicationandimplementationsection.
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3.
4KeyPressDetectionAfteraheadsetisinserted,thehostcanenableKeyPressdetectionthroughtheI2Cregisters.
ThiswillconfiguretheTS3A227Etodetectupto4differentkeysandreportwhenthekeyispressedandreleased.
9.
3.
5ClickPopNoiseReductionDuringanaccessoryinsertionandremovaleventtheTS3A227Eusespecialtechniquestoremovetheclick/popnoisethatcanoccurwithatraditionalimplementationcreatingabetteruserexperience.
9.
3.
6PoweroffNoiseRemovalInasystemthatintendstosupportbothheadsettypes,theendusercanplacethesystemintosleepmodeandleaveaheadset/speakerpluggedintotheaudiojack.
Iftheaudiojackswitchisturnedofftoconservepowerinthesleepmodethiswouldtypicallymeantheheadset/speakergroundwouldnotbeconnectedbecausethereisnopowertoturnonthegroundFETs.
Thiscreatesanaudiblehummingnoiseatthespeaker/headsetoutputthatcanbediscomfortingtolistento.
ByutilizingalwaysondepletionFETsthisissuecanberemovedandtheheadset/speakercanbeconnectedtogroundevenwiththedeviceunpowered.
9.
3.
7SleepModeTheTS3A227Ewillautomaticallyenteralowpowersleepwhennoaccessoryisinsertedandmanualswitchcontrolisnotenabled.
Afteranaccessoryisinsertedthedevicewillwake,rundetection,andconfiguretheswitchesasnecessary.
9.
3.
8CodecSenseLineInthecomplexsystemsoftoday,thereisanincreasingamountofICsonanygivenboard.
Theissuethiscreatesisthatacodeccanbefarawayfromtheaudiojackandthereisapotentialdifferencebetweenthegroundingofthecodecandthegroundingoftheheadset.
ByincorporatingagroundsenselineintotheTS3A227Ethecodeccancompensateforthisoffsetandcreateahigherqualityaudioexperience.
9.
3.
9FMSupportFMcanbepickedupusingtheheadsetgroundlineandpassedthroughthegroundFETsoftheTS3A227E.
Byhavingabandwidthof200MHzthefullFMbandcanbepassedthroughtheseFETstoaFMmatchingnetworkandtheFMreceiver.
9.
4DeviceFunctionalModes9.
4.
1SleepModeThedevicewillrealizeasleepmodeof1Aifthefollowingaretrue:NoaccessoryisinsertedManualSwitchControl='0'TheTS3A227EwillrespondtoI2Ccommunicationandinsertioneventswhileinsleepmode.
Theusercansetthede-bouncesettingsanddeviceconfigurationasdesiredwhileinthesleepmode.
IftheusersetstheManualSwitchControlbitto'1'thedevicewillturnonallblocksandcomeoutofsleepmode.
Ifthereisnoaccessoryinsertedandtheusersexitsmanualswitchcontrol,theswitcheswillreverttotheno-insertionstateandallunnecessaryblocksoftheTS3A227Ewillturnoffandenterthesleepmode.
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4.
2ManualSwitchControlTheTS3A227EsupportsmanualswitchcontrolthatcanbeutilizedbysettingBit6oftheDeviceSettings1registerto'1'.
Keyoperationalcharacteristicsofmanualswitchcontrolarebelow.
1.
Enablingthemanualswitchcontroldoesnotdisableautomaticinsertionandaccessorytypedetection.
2.
ManualSwitchControlisblockedduringaccessorytypedetectionwhichincludesanautomaticdetectionsequenceoramanualSWtriggereddetectionsequence.
Anychangestotheswitchcontrolregisters,orsettingthedevicetomanualswitchcontrolwillnotupdatetheswitchesuntilaftertheaccessorytypedetectionhascompleted.
3.
ManualSwitchControlisalsoblockedduringde-bounceperiods.
4.
Excludingitems2and3above,immediatelyafterthesystemenablesmanualswitchcontroltheswitchstateswillchangetoreflecttheswitchcontrolregisters.
Itisadvisedtosetthedesiredstateoftheswitchesbeforeenablingmanualswitchcontrol.
5.
TurningoffthedepletionFETsofthedevicewillresultinincreasedpowerconsumptionasdefinedintheelectricalcharacteristicstable.
6.
ImmediatelyuponsettingManualSwitchControl='0'thedevicewillautomaticallyconfiguretheswitchestothelatestdetectionstate.
IfanaccessoryisinsertedbuttheTS3A227EhasnotrundetectionduetoAuto_Det_EN='0',theswitchstatuswillreverttothenoinsertionstate.
7.
Thedevicecannotbeinsleepmodeandutilizemanualswitchcontrolatthesametime.
9.
4.
3ManualSwitchControlUseCasesThetablebelowcaptureswhatoccursaftera3-poleinsertionwiththeManualSwitchControl,AutoDETEnable,andDETTriggerbitssettothefollowingbeforeaninsertion.
MANUALDOESTYPEAUTODETDETTRIGGERSWITCHSTATUSAFTERDETTRIGGER(SW)AFTERSWITCHDETECTIONEN(SW)INSERTIONINSERTIONCONTROLRUN000noNo-insertion0001yes3-poleconfig0010yes3-poleconfig0011yes3-poleconfig0100noSwitchcontrolregisters0101yesSwitchcontrolregisters0110yesSwitchcontrolregisters0111yesSwitchcontrolregisters0Thetablebelowcapturestheswitchandrelevantregisteroutputsforsequence1.
EVENT3-POLE4-POLE4-POLEEVENTDESCRIPTIONSWITCHSTATUSSTANDARDBITNO.
BITOMTPBIT1DevicepowersupNo-insertion0002UsersetsAutoDETEnable='0'No-insertion00033-poleaccessoryisinsertedNo-insertion0004SystemsetsManualSwitchControl='1'Systemcontrolled0005Systemsetsswitchcontrolregisters=0xFFSystemcontrolled0006SystemsetsManualSwitchControl='0'No-insertion000版权2014–2015,TexasInstrumentsIncorporated21TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cnInsequence1atevent3theswitchstatusdoesnotchangebecausethesystemsettheAutoDETEnable='0'.
Whentheaccessoryisinsertedwewillnotrundetectionandnotchangetheswitchesbecauseofthis.
Atevent6thesystemturnsoffmanualswitchcontrol,theswitchstaterevertsbacktotheNo-insertionstatebecausetheTS3A227Ehasnotrandetection.
Thetablebelowcapturestheswitchandrelevantregisteroutputsforsequence2.
EVENTSWITCHSTATUS3-POLE4-POLE4-POLEEVENTDESCRIPTIONNO.
AFTEREVENTBITSTANDARDBITOMTPBIT1DevicepowersupNo-insertion0002UsersetsAutoDETEnable='0'No-insertion00033-poleaccessoryisinsertedNo-insertion0004SystemsetsManualSwitchControl='1'Systemcontrolled0005Systemsetsswitchcontrolregisters=0xFFSystemcontrolled0006SystemsetsDETTrigger='1'Systemcontrolled1007SystemsetsManualSwitchControl='0'3-poleconfiguration100Insequence2atevent3theswitchstatusdoesnotchangebecausethesystemsettheAutoDETEnable='0'.
Whentheaccessoryisinsertedwewillnotrundetectionandnotchangetheswitchesbecauseofthis.
Atevent6thesystemturnstriggersamanualtypedetectionandtheTS3A227Edetectsa3-poleaccessory.
Theswitchstatewillremaininthesystemcontrolledstate.
Atevent7thesystemexitsmanualswitchcontrol.
Theswitchstatuswillthenchangebacktothelastdetectionstate.
Becausedetectionwasranatevent6anda3-polewasdetected,theswitchstatewillreflectthatofthe3-poleswitchconfiguration.
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4.
4FMSupportModeFMsupportmodeneedstobeenteredviaI2CthroughtheDeviceSettingsregister.
Thiswillturnoffthedepletionswitcheswhenanaccessoryisinserted,eliminatingtheextragroundpath.
Thegroundlineoftheheadset/headphoneisusedforFMtransmission.
ThissignalmustpassthroughtheTS3A227EgroundFETsasshownin图17wheretheredlineindicatesthetransmissionpath.
图图17.
FMSupportTransmissionPath注注FMsupportshouldbeenabledbeforeanaccessoryisinserted.
TogglingtheFMsupportbitafteraheadsetisinsertedcancauseapopnoisetobeheardbytheenduser.
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5RegisterMapsTheI2CaddressoftheTS3A227Eisb'0111011Xor77hreadand76hwrite.
AddrNameTypeResetBit7Bit6Bit5Bit4Bit3Bit2Bit1Bit0(xxh)00hDeviceIDR11h00010001ADC01hInterruptR00hReservedDCIns/RemEventConversionKeyPressKey402hR00hKey4PressKey3ReleaseKey3PressKey2ReleaseKey2PressKey1ReleaseKey1PressInterruptsReleaseADCDCINTIns/RemEvent03hInterruptDisableR/W08hReservedINTDisableConversionDisableINTDisableINTDisableManualSwitchAutoDET04hDeviceSettingsR/W23hResetDETTriggerFMSupportInsertionDe-bounceTimeControlEnableKeyPress05hDeviceSetting1R/W00hReservedRawDataEnADCTriggerEnableKeyRelease06hDeviceSetting2R/W0EhReservedMICBIASSettingKeyPressDe-bounceDe-bounceRING2SLEEVESLEEVE07hSwitchControl1R/W00hReservedRING2DFETSwitch2Switch1GNDFETDFETGNDFET08hSwitchControl2R/W00hReservedS3PSS3PRS3GSS3GRRING2SLEEVESLEEVE09hSwitchStatus1R0ChReservedRING2DFETSwitch2Switch1GNDFETDFETGNDFET0AhSwitchStatus2R00hReservedS3PSS3PRS3GSS3GRAccessoryInsertion4-Pole0BhR00hReserved4-poleOMTP3-poleStatusStatusStandard0ChADCOutputR00hADC0DhThreshold1R/W20hKPThreshold10EhThreshold2R/W40hKPThreshold20FhThreshold3R/W68hKPThreshold3InterruptandKeyPressInterruptregisternotes:Thedevicewillcontinuetoautomaticallyruntypedetectionandkeypressdetectionevenifthehosthasnotservicedtheinterrupts.
Consecutivereadsofaninterruptregisterat400kHzwillnotallowtimefortheinternalregisterstoclearandwillappear.
Theinternaldigitalcorerequires200stocleartheregisterafterithasbeenread.
9.
6RegisterFieldDescriptions9.
6.
1DeviceIDRegisterFieldDescriptions(Address00h)图图18.
DeviceIDRegisterFieldDescriptions(Address00h)BitFieldTypeResetDescription7-0DeviceIDR11hUniqueRevisionnumber24版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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6.
2InterruptRegisterFieldDescriptions(Address01h)表表2.
InterruptRegisterFieldDescriptions(Address01h)BitFieldTypeResetDescription7-3ReservedR0h2ADCConversionR0hADCConversioncompleteInterrupt.
FlaggedafteramanualADCconversioniscomplete.
InterruptbitisclearedafterbeingreadthroughI2Corafteraremovalevent.
0h=Defaultstate1h=ADCConversionComplete1DCR0hDetectionCompleteinterrupt.
Flaggedafterdetectioniscompletedforaninsertionsequence.
Thisbitisalsoflaggedaftercompletionofamanuallytriggereddetection.
InterruptbitisclearedafterbeingreadthroughI2Corafteraremovalevent.
0h=Defaultstate1h=DetectionCompleted0Ins/RemEventR0hInsertionorremovalinterruptindicator.
Thisbitissetifthereisaninsertionorremovalevent.
TheInsertionstatusbitoftheAccessoryStatusregister(0Bh)mustbecheckedifthisbitisset.
InterruptbitisclearedafterbeingreadthroughI2C0h=Defaultstate1h=Accessoryhasbeeninsertedorremoved9.
6.
3KeyPressInterruptRegisterFieldDescriptions(Address02h)表表3.
KeyPressInterruptRegisterFieldDescriptions(Address02h)BitFieldTypeResetDescription7Key4ReleaseR0hThisinterruptbitissetaftertheuserhasreleasedkey4ontheaccessoryforadurationlongerthantheKeyReleaseDe-bouncetimer.
Thisbitwillauto-clearonthefollowingconditions:HostreadstheregisterthroughI2CTheKPEnablebitissetto'0'—TheKPEnablebitissetto'0'automaticallyafteraremovalTheKey4pressbitissetot'1'0h=DefaultState1h=Key4wasreleased6Key4PressR0hThisinterruptbitissetaftertheuserhaspressedkey4ontheaccessoryforadurationlongerthantheKeyPressDe-bouncetimer.
Thisbitwillauto-clearonthefollowingconditions:HostreadstheregisterthroughI2CTheKPEnablebitissetto'0'—TheKPEnablebitissetto'0'automaticallyafteraremoval0h=DefaultState1h=Key4wasreleased5Key3ReleaseR0hThisinterruptbitissetaftertheuserhaspressedKey3ontheaccessoryforadurationlongerthantheKeyReleaseDe-bouncetimer.
Thisbitwillauto-clearonthefollowingconditions:HostreadstheregisterthroughI2CTheKPEnablebitissetto'0'—TheKPEnablebitissetto'0'automaticallyafteraremovalTheKey3Pressbitissetto'1'0h=DefaultState1h=Key3wasreleased版权2014–2015,TexasInstrumentsIncorporated25TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cn表表3.
KeyPressInterruptRegisterFieldDescriptions(Address02h)(接接下下页页)BitFieldTypeResetDescription4Key3PressR0hThisinterruptbitissetaftertheuserhaspressedKey3ontheaccessoryforadurationlongerthantheKeyPressDe-bouncetimer.
Thisbitwillauto-clearonthefollowingconditions:HostreadstheregisterthroughI2CTheKPEnablebitissetto'0'—TheKPEnablebitissetto'0'automaticallyafteraremoval0h=DefaultState1h=Key3wasreleased3Key2ReleaseR0hThisinterruptbitissetaftertheuserhaspressedKey2ontheaccessoryforadurationlongerthantheKeyReleaseDe-bouncetimer.
Thisbitwillauto-clearonthefollowingconditions:HostreadstheregisterthroughI2CTheKPEnablebitissetto'0'—TheKPEnablebitissetto'0'automaticallyafteraremovalTheKey2Pressbitissetto'1'0h=DefaultState1h=Key2wasreleased2Key2PressR0hThisinterruptbitissetaftertheuserhaspressedKey2ontheaccessoryforadurationlongerthantheKeyPressDe-bouncetimer.
Thisbitwillauto-clearonthefollowingconditions:HostreadstheregisterthroughI2CTheKPEnablebitissetto'0'—TheKPEnablebitissetto'0'automaticallyafteraremoval0h=DefaultState1h=Key2wasreleased1Key1ReleaseR0hThisinterruptbitissetaftertheuserhaspressedKey1ontheaccessoryforadurationlongerthantheKeyReleaseDe-bouncetimer.
Thisbitisusedforrawdatareleaseevents.
Thisbitwillauto-clearonthefollowingconditions:HostreadstheregisterthroughI2CTheKPEnablebitissetto'0'—TheKPEnablebitissetto'0'automaticallyafteraremovalTheKey1Pressbitissetto'1'0h=DefaultState1h=Key1wasreleased0Key1PressR0hThisinterruptbitissetaftertheuserhaspressedKey1ontheaccessoryforadurationlongerthantheKeyPressDe-bouncetimer.
Thisbitisusedforrawdatapressevents.
Thisbitwillauto-clearonthefollowingconditions:HostreadstheregisterthroughI2CTheKPEnablebitissetto'0'—TheKPEnablebitissetto'0'automaticallyafteraremoval0h=DefaultState1h=Key1wasreleased26版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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6.
4InterruptDisableRegisterFieldDescriptions(Address03h)表表4.
InterruptDisableRegisterFieldDescriptions(Address03h)BitFieldTypeResetDescription7-3ReservedR0h+3INTDisableR/W1hEnablesordisablesallinterrupts.
DisablingtheinterruptswillcausetheINTtonotassertbutthebitswillstillpopulate.
0h=interruptsareenabled1h=interruptsaredisabled2ADCConversionR/W0hEnablesordisablestheADCconversioninterrupt.
DisablingtheinterruptwillINTDisablecauseINTtonotassertbuttheinterruptbitwillstillbeset.
Intheusecasethatthisbitis=='1'andakeyispressed,theKeyPressinterruptwillstillasserttheINTpin.
IfthehostissuesasoftwareADCtriggerafterthekeyhasbeenpressed,theinterruptwillnotassertasthatADCconversionistheonlyinterruptpresent.
0h=ADCConversioninterruptisenabled1h=ADCConversioninterruptisdisabled1DCINTDisableR/W0hEnablesordisablestheDCinterrupt.
DisablingtheinterruptwillcauseINTtonotassertbuttheinterruptbitwillstillbeset.
0h=DCinterruptisenabled1h=DCinterruptisdisabled0Ins/RemEventINTR/W0hEnablesordisablestheIns/RemEventinterrupt.
DisablingtheinterruptwillDisablecauseINTtonotassertbuttheinterruptbitwillstillbeset.
0h=Ins/RemEventinterruptisenabled1h=Ins/RemEventinterruptisdisabled9.
6.
5DeviceSettingsFieldDescriptions(Address04h)表表5.
DeviceSettingsFieldDescriptions(Address04h)BitFieldTypeResetDescription7ResetR/W0hInitiatessoftwareresetoftheTS3A227E.
Thiswillinterruptanyon-goingoperationinternaltothedevice.
0h=Defaultstate1h=Initiatesareset6ManualSwitchR/W0hEnablesManualcontroloftheTS3A227Eswitches.
AfterenablingmanualswitchControlcontroltheswitchstatuswillimmediatelyreflectthevaluesintheswitchcontrolregistersprovidedaccessorytype.
0h=Manualswitchcontroldisabled1h=Manualswitchcontrolenabled5AutoDETEnableR/W1hControlswhetherdetectionisautomaticallyranafteraninsertion.
0h=Autoaccessorydetectionisdisabled1h=Autoaccessorydetectionisenabled4DETTriggerR/W0hManuallytriggersdetection.
Thisbitisautoclearedafterdetectioniscompleted.
ADETTriggerrequestwillbeignoredinthefollowingcases:Adetectioneventiscurrentlybeingservice.
Theinterruptregisterisnotcleared(Register02hmustbe=00h)Thereisnoaccessoryinserted(/DET_TRIGGERishigh)0h=Defaultvalue1h=Manuallytriggerdetection3FMSupportR/W0hTurnsonFMsupport.
ThiswillturnoffthedepletionFETsifanyaccessoryisinsertedallowingFMtransmissionthroughthegroundFETsatthecostofincreasedcurrentconsumption.
0h=FMnotsupportedanddepletionFETsareonafteraninsertion1h=FMsupportedanddepletionFETsareoffafteraninsertion版权2014–2015,TexasInstrumentsIncorporated27TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cn表表5.
DeviceSettingsFieldDescriptions(Address04h)(接接下下页页)BitFieldTypeResetDescription2.
0InsertionDe-bounceR/W3hControlstheinsertionde-bouncetimer.
ValuesbelowaretypicalvaluesthathaveTime±30%variation.
Valuesinadditionhavea±1msvariationthoughthiswillonlyreallyaffectthe2mstimer.
0h=2ms1h=30ms2h=60ms3h=90ms4h=120ms5h=150ms6h=1s7h=2s9.
6.
6KeyPressSettings1FieldDescriptions(Address05h)表表6.
DeviceSettings1FieldDescriptions(Address05h)BitFieldTypeResetDescription7-3ReservedR0h2KeyPressEnableR/W0hEnablestheKeyPressdetectionoftheTSA227E.
Thisbitautoclearsafteraremovalevent.
IftheKeyPressEnablebitisset'1'andtheManualSwitchControlbitissetto'1',theS3matrixmustbeinoneofthetwocorrectpositionasdescribedintheKeyPressDetectionsectionfortheTS3A227Etorunkeypressdetection.
0h=Defaultstate1h=EnablesKeyPressdetection1RawDataEnR/W0hEnablestheRawdatamodeforKeyPressDetection.
ThisbitautoclearsiftheKeyPressEnablebitissetto'0'.
EnablingrawdatamodewillnotcleartheKPinterruptregister.
AfterenablingRawDataanykeypressandreleaseeventisrecordedusingtheKey1PressandKey2PressReleaseevent.
TheADCconversionwillberecordedintheADCoutputregister.
0h=RawDataisnotenabled1h=RawDataisenabled0ADCTriggerR/W0hCausesamanualADCtriggeriftheKeyPressEnableandRawDataENbitsarebothsetto'1'.
AftertheADCconversioniscompletetheADCConversioninterruptwillbesetandtheADCOutputregisterwillbepopulated.
ThisbitautoclearsaftertheADCConversioniscomplete.
AnewADCConversioncanbeinitiatedeveniftheADCConversioninterrupthasnotbeenserviced.
0h=DefaultState1h=TriggersADCconversion28版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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6.
7KeyPressSettings2FieldDescriptions(Address06h)表表7.
DeviceSettings2FieldDescriptions(Address06h)BitFieldTypeResetDescription7-6ReservedR0h5-3MICBIASSettingR/W1hThiscontrolsthekeypressthreshold.
SetthissettingclosesttotheintendedMICBIASvoltage0h=2.
1V1h=2.
2V(Default)2h=2.
3V3h=2.
4V4h=2.
5V5h=2.
6V6h=2.
7V7h=2.
8V2KeyReleaseDe-R/W1hControlstheKey-Releasede-bouncetimer.
Valuesbelowaretypicalvaluesthatbouncehave±30%variation.
Valuesinadditionhavea±1msvariationthoughthiswillonlyreallyaffectthe2mstimer.
0h=2ms1h=20ms(Default)1-0KeyPressDe-R/W2hControlsthekeypressde-bouncetimer.
Valuesbelowaretypicalvaluesthatbouncehave±30%variation.
Valuesinadditionhavea±1msvariationthoughthiswillonlyreallyaffectthe2mstimer.
0h=2ms1h=40ms2h=80ms(Default)3h=120ms版权2014–2015,TexasInstrumentsIncorporated29TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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6.
8SwitchControl1FieldDescriptions(Address07h)表表8.
SwitchControl1FieldDescriptions(Address07h)BitFieldTypeResetDescription7-6ReservedR0h5SLEEVEGNDFETR/W0hConfiguresthestateoftheSLEEVEGNDFETifmanualswitchcontrolisenabled.
Ifmanualswitchcontrolisnotenabledthisbitisignored.
0h=SLEEVEGNDFETswitchoff1h=SLEEVEGNDFETswitchon4RING2DFETR/W0hConfiguresthestateoftheRING2GNDFETifmanualswitchcontrolisenabled.
Ifmanualswitchcontrolisnotenabledthisbitisignored.
0h=RING2GNDFETswitchoff1h=RING2GNDFETswitchon3SLEEVEDFETR/W0hConfiguresthestateoftheSLEEVEDFETifmanualswitchcontrolisenabled.
Ifmanualswitchcontrolisnotenabledthisbitisignored.
0h=SLEEVEDFETswitchoff1h=SLEEVEDFETswitchon2RING2DFETR/W0hConfiguresthestateoftheRING2DFETifmanualswitchcontrolisenabled.
Ifmanualswitchcontrolisnotenabledthisbitisignored.
0h=RING2DFETswitchoff1h=RING2DFETswitchon1Switch2R/W0hConfiguresthestateoftheSwitch2ifmanualswitchcontrolisenabled.
Ifmanualswitchcontrolisnotenabledthisbitisignored.
0h=Switch2off1h=Switch2on0Switch1R/W0hConfiguresthestateoftheSwitch1ifmanualswitchcontrolisenabled.
Ifmanualswitchcontrolisnotenabledthisbitisignored.
0h=Switch1off1h=Switch1on9.
6.
9SwitchControl2FieldDescriptions(Address08h)表表9.
SwitchControl2FieldDescriptions(Address08h)BitFieldTypeResetDescription7-4ReservedR0h3S3PSR/W0hConfiguresthestateoftheS3PSifmanualswitchcontrolisenabled.
Ifmanualswitchcontrolisnotenabledthisbitisignored.
0h=S3PSswitchoff1h=S3PSswitchon2S3PRR/W0hConfiguresthestateoftheS3PRifmanualswitchcontrolisenabled.
Ifmanualswitchcontrolisnotenabledthisbitisignored.
0h=S3PRswitchoff1h=S3PRswitchon1S3GSR/W0hConfiguresthestateoftheS3GSifmanualswitchcontrolisenabled.
Ifmanualswitchcontrolisnotenabledthisbitisignored.
0h=S3GSoff1h=S3GSon0S3GRR/W0hConfiguresthestateoftheS3GRifmanualswitchcontrolisenabled.
Ifmanualswitchcontrolisnotenabledthisbitisignored.
0h=S3GRoff1h=S3GRon30版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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6.
10SwitchStatus1FieldDescriptions(Address09h)表表10.
SwitchStatus1FieldDescriptions(Address09h)BitFieldTypeResetDescription7-6ReservedR0h5SLEEVEGNDFETR0hIndicatesthestatusofSLEEVEGNDFET0h=SLEEVEGNDFETswitchisoff1h=SLEEVEGNDFETswitchison4RING2GNDFETR0hIndicatesthestatusofRING2GNDFET0h=RING2GNDFETswitchisoff1h=RING2GNDFETswitchison3SLEEVEDFETR1hIndicatesthestatusofSLEEVEDFET0h=SLEEVEDFETswitchisoff1h=SLEEVEDFETswitchison2RING2DFETR1hIndicatesthestatusofRING2DFET0h=RING2DFETswitchisoff1h=RING2DFETswitchison1Switch2R0hIndicatesthestatusofSwitch20h=Switch2isoff1h=Switch2ison0Switch1R0hIndicatesthestatusofSwitch10h=Switch1isoff1h=Switch1ison9.
6.
11SwitchStatus2FieldDescriptions(Address0Ah)表表11.
SwitchStatus2FieldDescriptions(Address0Ah)BitFieldTypeResetDescription7-4ReservedR0h3S3PSR0hIndicatesthestatusofS3PS0h=S3PSswitchisoff1h=S3PSswitchison2S3PRR0hIndicatesthestatusofS3PR0h=S3PRswitchisoff1h=S3PRswitchison1S3GSR0hIndicatesthestatusofS3GS0h=S3GSisoff1h=S3GSison0S3GRR0hIndicatesthestatusofS3GR0h=S3GRisoff1h=S3GRison版权2014–2015,TexasInstrumentsIncorporated31TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cn9.
6.
12DetectionResultsFieldDescriptions(Address0Bh)表表12.
DetectionResultsFieldDescriptions(Address0Bh)BitFieldTypeResetDescription7-4ReservedR0h3InsertionStatusR0hIndicatesifanaccessoryisinsertedthejackornot.
ThisbitissettothecorrespondingstateafteranaccessoryisinsertedorremovedandshouldbereadaftertheIns/RemEventinterrupthasbeensetto'1'.
0h=Anaccessoryisnotinthejack1h=Anaccessoryisinthejack24-poleStandardR0hIndicatesifa4-poleStandardheadsetisdetected.
Bitissetafteracompleteddetectionsequence.
0h=Defaultstate1h=4-polestandardheadsetdetected14-poleOMTPR0hIndicatesifa4-poleOMTPheadsetisdetected.
Bitissetafteracompleteddetectionsequence.
0h=Defaultstate1h=4-poleOMTPheadsetdetected03-poleR0hIndicatesifa3-poleheadphoneisdetected.
Bitissetafteracompleteddetectionsequence.
0h=Defaultstate1h=3-poleheadphonedetected9.
6.
13ADCOutputFieldDescriptions(Address0Ch)表表13.
ADCOutputFieldDescriptions(Address0Ch)BitFieldTypeResetDescriptionThisfieldcontainstheoutputofthekeypressdetectionADCasdescribedin7-1ADCR/W00hthekeypressdetectionregister0ReservedR0h9.
6.
14Threshold1FieldDescriptions(Address0Dh)表表14.
Threshold1FieldDescriptions(Address0Dh)BitFieldTypeResetDescriptionThisfieldsetsthekey1andkey2boundarythreshold.
Thisvaluemustalways7-01KPThreshold1R/W20hbelowerthantheThreshold2registerforproperoperation.
0ReservedR0h9.
6.
15Threshold2FieldDescriptions(Address0Eh)表表15.
Threshold2FieldDescriptions(Address0Eh)BitFieldTypeResetDescriptionThisfieldsetsthekey2andkey3boundarythreshold.
Thisvaluemust7-1KPThreshold2R/W40halwaysbelowerthantheThreshold3registerandhigherthanthethreshold2registerforproperoperation.
0ReservedR0h9.
6.
16Threshold3FieldDescriptions(Address0Fh)表表16.
Threshold3FieldDescriptions(Address0Fh)BitFieldTypeResetDescriptionThisfieldsetsthekey3andkey4boundarythreshold.
Thisvaluemust7-1KPThreshold3R/W68halwaysbehigherthantheThreshold2registerforproperoperation.
0ReservedR0h32版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY201510ApplicationandImplementation10.
1ApplicationInformation图19showshowastandardapplicationschematicfortheTS3A227E.
TheDSBGApackagepinconnectionswillbethesameexceptforthelackofthermalpad.
ThefollowingsectionsdiscusshowtheTS3A227Eworkswithdifferentheadsetsandhowthekeypressdetectionoperates.
10.
2TypicalApplication图图19.
TypicalApplicationSchematic表表17.
ComponentListCOMPONENTVALUENOTESR14.
7kΩPullupresistormustbesizedtonotexceedmaxIOLspecificationforINTpinR24.
7kΩPullupresistormustbesizedtonotexceedmaxIOLspecificationforINTpinR34.
7kΩPullupresistormustbesizedtonotexceedmaxIOLspecificationforINTpinR44.
7kΩPullupresistormustbesizedtonotexceedmaxIOLspecificationforINTpinR510kΩPulldownresistorforhightolowtransitiononDET_TRIGGERR62.
2kΩ±1%MICBIASpullupresistormustbe±1%forKeyPressDetectiontofunctionproperlyC110FDe-couplingcapacitorforVDDC2100nFDe-couplingcapacitorforVDDC31FValuecanvarydependingoncodecneedsValuecanvarydependingonFMmatchingnetworkneeds.
IfFMtransmissionisnotbeingC447nFsupportedbytheapplicationthiscapacitorisnotneededValuecanvarydependingonFMmatchingnetworkneeds.
IfFMtransmissionisnotbeingL1180nFsupportedbytheapplicationthisinductorisnotneededandGNDAmustbeshortedtoGND10.
2.
1DesignRequirements10.
2.
1.
1StandardI2CInterfaceDetailsThebi-directionalI2Cbusconsistsoftheserialclock(SCL)andserialdata(SDA)lines.
Bothlinesmustbeconnectedtoapositivesupplyviaapull-upresistorwhenconnectedtotheoutputstagesofadevice.
Datatransfermaybeinitiatedonlywhenthebusisnotbusy.
版权2014–2015,TexasInstrumentsIncorporated33TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cnI2CcommunicationwiththisdeviceisinitiatedbythemastersendingaSTARTcondition,ahigh-to-lowtransitionontheSDAlinewhiletheSCLlineishigh.
Afterthestartcondition,thedeviceaddressbyteissend,MSBfirst,includingthedatadirectionbit(R/W).
Thisdevicedoesnotrespondtothegeneralcalladdress.
Afterreceivingthevalidaddressbyte(0x77read,0x76write),thisdevicerespondswithanACK,alowontheSDAlineduringthehighoftheACK-relatedclockpulse.
ThedatabytefollowstheaddressACK.
TheR/Wbitiskeptlowfortransferfromthemastertotheslave.
ThedatabyteisfollowedbyanACKsentfromthisdevice.
Dataareoutputonlyifcompletebytesarereceivedandacknowledged.
Theoutputdataisvalidattime(tpv)afterthelow-to-hightransitionofSCL,duringtheclockcyclefortheACK.
OntheI2Cbus,onlyonedatabitistransferredduringeachclockpulse.
ThedataontheSDAlinemustremainstableduringthehighpulseoftheclockperiod,aschangesinthedatalineatthistimeareinterpretedascontrolcommands(STARTorSTOP).
AStopcondition,alow-to-hightransitionontheSDAlinewhiletheSCLlineishigh,issentbythemaster.
Thenumberofdatabytestransferredbetweenthestartandthestopconditionsfromthetransmittertoreceiverisnotlimited.
EachbyteofeightbitsisfollowedbyoneACKbit.
ThetransmittermustreleasetheSDAlinebeforethereceivercansendanACKbit.
AslavereceiverthatisaddressedmustgenerateanACKafterthereceptionofeachbyte.
ThedevicethatacknowledgeshastopulldowntheSDAlineduringtheACKclockpulsesothattheSDAlineisstablelowduringthehighpulseoftheACK-relatedclockperiod.
Setupandfoldtimesmustbetakenintoaccount.
图图20.
AcknowledgmentontheI2CBus10.
2.
1.
2WriteOperationsDataistransmittedtotheTS3A227EbysendthedevicesalveaddressandsettingtheLSBtoalogic0.
Thecommandbyteissentaftertheaddressanddetermineswhichregisterreceivesthedatathatfollowsthecommandbyte.
ThenextbyteiswrittentothespecifiedregisterontherisingedgeoftheACKclockpulse.
SeeFigure2andFigure3fordifferentmodesofwriteoperations.
图图21.
RepeatedDataWritetoaSingleRegister34版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015图图22.
BurstDataWritetoMultipleRegisters10.
2.
1.
3ReadOperationsThebusmastermustsendtheTS3A227EslaveaddresswiththeLSBsettologic0.
Thecommandbyteissentaftertheaddressanddetermineswhichregisterisaccessed.
Afterarestart,thedeviceslaveaddressissentagainbutthistimetheLSBissettologic1.
DatafromtheregisterdefinedbythecommandbytethenissentbacktothehostbytheTS3A227E.
DataisclickedintotheSDAoutputshiftregisterontherisingedgeoftheACKclockpulse.
图23and图24showreadoperationsthatusearestartbetweenthesub-addresswriteandthereadoperation.
AStopandstartconditionbetweenthesub-addresswriteandthereadoperationisalsoacceptable.
Notes:1.
SDAispulledlowonACKfromtheslaveormaster.
2.
Registerwritealwaysarequiresub-addresswritebeforewritingthefirstdata.
3.
RepeateddatawritestoasingleregistercontinueindefinitelyuntilnI2CStoporRe-start.
4.
RepeateddatareadsfromasingleregistercontinueindefinitelyuntilanI2CNACKisreceivedfromthemaster5.
Burstdatawritesstartatthespecifiedregisteraddress,thenadvancetothenextregisteraddress,eventotheread-onlyregistersandcontinueuntiltheStoporRe-start.
Fortheread-onlyregisters,datawriteappearstooccur,althoughtheregistercontentsarenotchangedbythewriteoperations.
6.
Burstdatareadsstartatthespecifiedregisteraddress,thenadvancetothenextregisteraddressandcontinuesuntilanI2CNACKisreceivedfromthemaster.
图图23.
RepeatedDataReadFromaSingleRegister版权2014–2015,TexasInstrumentsIncorporated35TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cn图图24.
BurstDataReadFromMultipleRegisters10.
2.
2DetailedDesignProcedure10.
2.
2.
1AccessoryInsertionTheTS3A227EmonitorstheDET_TRIGGERpintodeterminewhenaninsertioneventoccurs.
AhightolowtransitiononetheDET_TRIGGERpinwillstarttheinternalde-bouncetimer(default90ms).
Thistransitionisshownin图19.
Oncethede-bouncetimerhasexpired,itisdeterminedthatanaccessoryisinsertedandthedetectionalgorithmisperformedtodeterminewhattheaccessoryisandwherethegroundlineislocated.
图图25.
DET_TRIGGERTransitionDiagramOnceaDET_TRIGGERtransitionhasoccurred,anyI2Cregisterchangeswillnotbeserviceduntilafterthede-bounceanddetectionsequencehavecompleted.
IfDET_TRIGGERtransitionsfromLowtoHighbeforethede-bounceperiodhasexpired.
TheI2Cregisterchangeswillbeservicedbeforeanewde-bouncetimerisstartedfromanotherHightoLowtransitionontheDET_TRIGGERpin.
TheI2CcommunicationhastocompletebeforethenextHightoLowtransitiontotakeeffect.
10.
2.
2.
2AudioJackSelectionTheaudiojackthesystemusesplaysakeyroleinhowthesystemperformsandtheexperiencetheenduserhaswiththeequipment.
Inreal-worldscenariosausermightplugintheheadsettotheaudiojackveryslowly.
ThiscreatesachallengingcasefortheTS3A227EdetectionmechanismanddetectionerrorcanoccurifcareisnottakenwhendesigningthecomponentsaroundtheTS3A227E.
36版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015Themainconcernforslowplug-inisthedetectionprocessmayhavealreadystartedbeforetheheadsetisfullyinsertedintothejack.
Ifthedetectionisrunningwiththeheadsetoutofposition,afalseimpedancemeasurementmayoccur.
ForbestperformanceajackshouldbechosenthatputsthedetectionmechanismontheTIPpinattheendofphysicaljacktoensurethatitisfullyinserted.
TheTS3A227EEVMcontainstestpointsforallthejackpinsandcanbebluewiredtoprototypeaudiojacksfortesting.
10.
2.
2.
3SwitchStatus表18depictstheswitchstatusforeachdeviceconfiguration.
Aswitchdiagramisprovidedin图26.
表表18.
SwitchStatusRING2SLEEVERING2SLEEVEDeviceStateS1S2S3PSS3PRS3GSS3GRGNDFETGNDFETDFETDFETDefaultState(NoinsertionHigh-ZHigh-ZHigh-ZHigh-ZHigh-ZHigh-ZHigh-ZHigh-ZOnOnorVDD=0V)DetectionrunningHigh-ZOnHigh-ZHigh-ZHigh-ZHigh-ZHigh-ZHigh-ZHigh-ZHigh-Z3-poleOnHigh-ZHigh-ZHigh-ZOnOnOnOnOnOn3-polewithFMsupportOnHigh-ZHigh-ZHigh-ZHigh-ZOnOnHigh-ZHigh-ZHigh-Z4-poleOMTPHigh-ZHigh-ZHigh-ZOnOnHigh-ZHigh-ZOnHigh-ZOn4-poleOMTPwithFMHigh-ZHigh-ZHigh-ZOnOnHigh-ZHigh-ZOnHigh-ZHigh-Zsupport4-poleStandardHigh-ZHigh-ZOnHigh-ZHigh-ZOnOnHigh-ZOnHigh-Z4-poleStandardwithFMHigh-ZHigh-ZOnHigh-ZHigh-ZOnOnHigh-ZHigh-ZHigh-Zsupport图图26.
SwitchDiagram版权2014–2015,TexasInstrumentsIncorporated37TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cn10.
2.
2.
3.
1SwitchStatusDiagramsClosedswitchesareredin图27through图31.
Thediagramsreflectswitchstateswhenmanualswitchcontrolisnotenabled.
图图27.
DefaultSwitchStateWithNoAccessoryInserted图图28.
SwitchStateDuringDetection38版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015图图29.
SwitchStateAfterDetectinga3-PoleHeadphone图图30.
SwitchStateAfterDetectiona4-poleOMTPHeadset版权2014–2015,TexasInstrumentsIncorporated39TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cn图图31.
SwitchStateAfterDetectinga4-PoleStandardHeadset40版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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com.
cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY201510.
2.
2.
4KeyPressDetection10.
2.
2.
4.
1KeyPressThresholdsTheTS3A227Efeaturestheabilitytoadjustthekeypressthresholdsonthefly.
Thedefaultkeypressbinsareshownbelowwiththedefaultvaluesofthethresholdregistersoptimizedtodetectthesekeys.
Thevaluesforthebinsrepresenttheequivalentresistanceofthekeybeingpressedwiththemicrophoneinparallel.
Anyequivalentresistanceoutsidethesebinsisnotguaranteedtobedetectedcorrectly.
KEYTYPICALRESISTANCEEQUIVALENTRESISTANCERANGEKey150Ω0Ω–66ΩKey2135Ω126Ω–156ΩKey3240Ω228Ω–264ΩKey4470Ω360Ω–680ΩTheThreshold1register(Address0Dh)adjuststhedetectionboundarybetweenKey1andKey2.
TheThreshold2register(Address0Eh)adjuststhedetectionboundarybetweenKey2andKey3.
TheThreshold3register(Address0FhadjuststhedetectionboundarybetweenKey3andKey4.
Thethresholdsare7bitvaluesthatcanbeadjustedforthefollowingformula.
Targetbinboundary=KPThreshold[6:0]*6Ω(1)ItisimportantfortheproperoperationoftheKPdetectionalgorithmthatthethresholdsbeorderedcorrectly:KPThreshold1XXXms){TheKey#isbeinghelddown,handleaccordingly.
E.
g.
ifKey#isthevolumeupkey,thesystemwillincrementthevolumeuntiltheKey#ReleaseinterruptisreadfromtheTS3A227E}10.
2.
2.
4.
5SingleKeyPressTimingThediagrambelowdepictsakeypresseventwheretheMICisontheSLEEVEpin.
IftheMICisonRING2thetimingdiagramwillbesame.
44版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015A.
AtthispointtheSLEEVEvoltagehasstoppedglitchingandtheKeyPressDe-bouncetimerwillnolongerrestart.
B.
PointBistheendofthekeypressde-bounceperiod.
INTwillbeassertedwiththeKeyPressbitset.
C.
Thehostreadandclearstheinterruptregister,de-assertingtheINTpin.
D.
Herethekeyisreleasedandthekeyreleasede-bounceperiodbegins.
E.
Thekeyreleasede-bounceperiodendsandtheINTpinisassertedagainwiththeKeyReleasebitset.
F.
Herethehostreadsandclearstheinterruptregister,de-assertingtheINTpin.
10.
2.
2.
4.
6MultipleKeyPressTimingThediagrambelowdepictsamultiplekeypresseventinwhichthehostdoesnotimmediatelyreadtheinterruptregister.
TheMICisontheSLEEVEpininthisdiagram.
IftheMICisonRING2thetimingdiagramwillbethesame.
注注IftheKPEnablebitissetto'0'duringkeypressdetection,keypressdetectionwillstopimmediatelyandallthekeypress/releasebitswillbecleared.
版权2014–2015,TexasInstrumentsIncorporated45TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cnA.
TheSLEEVEvoltagedropsbelowtheKeyPressDetectionthresholdandtheKeyPressDe-bouncetimerisstartedB.
Theendofthekeypressde-bouncetimer.
Key1isdetected,theKey1Pressinterruptissetandtheinterruptlineisasserted.
TheKey1Releaseinterruptiscleared.
C.
TheSLEEVEvoltagerisestoMICBIASasthekeyisreleased.
TheKeyReleasede-bouncetimerisstarted.
D.
TheKeyReleasede-bouncetimerexpires.
TheKey1Releasebitissetandtheinterruptisasserted.
E.
TheSLEEVEvoltagedropsbelowtheKeyPressDetectionthresholdandtheKeyPressDe-bouncetimerisstartedF.
Theendofthekeypressde-bouncetimer.
Key2isdetected,theKey2Pressinterruptissetandtheinterruptlineisasserted.
TheKey2Releaseinterruptiscleared.
G.
TheSLEEVEvoltagerisestoMICBIASasthekeyisreleased.
TheKeyReleasede-bouncetimerisstarted.
H.
TheKeyReleasede-bouncetimerexpires.
TheKey2Releasebitissetandtheinterruptisasserted.
I.
TheSLEEVEvoltagedropsbelowtheKeyPressDetectionthresholdandtheKeyPressDe-bouncetimerisstartedJ.
Theendofthekeypressde-bouncetimer.
Key1isdetected,theKey1Pressinterruptissetandtheinterruptlineisasserted.
TheKey1Releaseinterruptiscleared.
K.
ThehostreadstheI2Cinterruptregisterandseesthefollowinginterrupts:mmmKey1PressmmmKey2PressmmmKey2ReleaseUsingthepseudo-codeinthekeypressdetectionsectionthisisinterpretedas:mmmKey2waspressedonetimeandisnotbeingheldmmmKey1iscurrentlypressed,startthekeypressdurationtimer46版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY201510.
2.
2.
4.
7RawDataKeyPressDetectionInadditiontothresholdadjustmenttheTS3A227EfeaturestheabilitytoutilizetheinternalADCrawoutputwiththeRawDataEnbitoftheDeviceSetting2register.
NotesonusingtheRawADCOutput:KeyPress/ReleaseinterruptsthathavenotbeenservicedwillnotbecleareduponsettingtheRawDataEnbitto'1'.
BySettingtheRawDataEnbitto'1'theKeyPressThresholdregisterswillbeignored.
Insteadofreportingkey1through4pressandreleasestheTS3A227EwillonlyuseKey1PresstoindicatethatakeyispressedandtheKey1Releaseinterrupttoreportthatthekeywasreleased.
TheADCOutputregisterwillonlybeclearedaftertheRawDataEnbitiscleared.
TheRawDataEnbitisclearediftheKeyPressEnablebitissetto'0'.
ConsequentlytheADCOutputregisterclearsiftheRawDataEnbitissetto'0',theKeyPressEnablebitissetto'0',oraremovaleventoccurs.
ThismeanstheADCOutputregisterwillnotclearafteritisread.
AmanualsoftwaretriggercanbeinitiatedafterakeywaspressedtoruntheADCdetectionagain.
ThiswillnotsettheKey1Pressinterrupt.
TheADCOutputisupdatedafteraKeyisdetectedorifthemanualADCtriggerbitissetto'1'.
IfanADCconversionhascompletedtheADCConversioninterruptbitwillbesetto'1'regardlessiftherewasasoftwareinitiatedtriggerorifanewkeypresswasdetected.
IftheADChascompletedaconversiontheoutputisalwaysnon0meaningthelowestpossibledetectionthresholdoftheADCis01h.
IftheADCOutputregisteris00haconversionhasnotbeencompletedortheADCOutputwascleared.
TheprevioussectionongrayzonesshouldbeappliedtoanybinscreatefortherawADCmode.
10.
2.
3ApplicationCurves图图34.
MaxCurrentvsContactResistance11PowerSupplyRecommendationsTheTS3A227Eisdesignedtooperatefromaninputvoltagesupplyrangebetween2.
5Vand4.
5V.
Thisinputsupplyisrecommendedtobedecoupledtogroundviatwode-couplingcapacitorsof0.
1Fand1FplacedascloseaspossibletotheTS3A227E.
ToensureaPORtripduringapower-downandpower-oneventthepowersupplyshouldfollowtheminimumandmaximumVDDriseandfalltimesspecifiedintheelectricalspecificationssection.
TheTS3A227EfeaturestheabilitytopowerthedigitalIOpinsatadifferentrailthanthesupply.
ThisallowssystemstoruntheTS3A227Eat3.
3Vandstillusea1.
8Veliminatingtheneedforatranslator.
Havethe1.
8VrailwhilethedeviceispoweredfromahighervoltagewillincreasethecurrentconsumptionofthedeviceduetoCMOSshootthroughcurrent.
Thisincreasedsupplycurrentisdocumentedintheelectricalspecificationstable.
版权2014–2015,TexasInstrumentsIncorporated47TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cn12Layout12.
1LayoutGuidelinesTheVDDpinmusthavede-couplingcapacitorsplacesascloselytothedeviceaspossible.
Typicallyrecommendedcapacitorsarea0.
1Fand1Fcapacitor.
IfFMsupportisnotneededconnectGNDAtosystemGNDalongwiththeGNDconnectionswiththeshortestconnectionspossible.
RING2andSLEEVEshouldberoutedonthesamelayerastheaudiojackforbestperformancewithlessthan50mΩtotheaudiojackpins.
Thesetwopinsshouldhavepriorityinlayoutoverotherpins.
Itisrecommendedtonotuseviasonthesetracesandpairthedevicewithanaudiojackthatfacilitatesthistypeoflayout.
TheRING2_SENSEandSLEEVE_SENSEpinsarekelvinconnectionstotheaudiojackandshouldbeshortedtoRING2andSLEEVEasclosetotheaudiojackaspossible.
Ifthereare0ΩresistorsbetweentheSLEEVE/RING2pinsandthejack,connecttheSENSElinestothejacksleeveandring2contacts.
IfamicrophoneisconnectedoneoftheSENSElineswillcarrythemicrophonesignalandtheMICBIASsupply.
Itisrecommendedthatthesetracesnothavemorethan1Ωimpedancetothejack.
RoutetheI2Canddigitalsignalsawayfromtheaudiosignalstopreventcouplingontotheaudiolines.
12.
2LayoutExample(QFN)图图35.
QFNLayoutExample48版权2014–2015,TexasInstrumentsIncorporatedTS3A227Ewww.
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cnZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY201512.
3LayoutExample(DSBGA)图图36.
DSBGALayoutExample版权2014–2015,TexasInstrumentsIncorporated49TS3A227EZHCSD70B–NOVEMBER2014–REVISEDFEBRUARY2015www.
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cn13器器件件和和文文档档支支持持13.
1商商标标Alltrademarksarethepropertyoftheirrespectiveowners.
13.
2静静电电放放电电警警告告这些装置包含有限的内置ESD保护.
存储或装卸时,应将导线一起截短或将装置放置于导电泡棉中,以防止MOS门极遭受静电损伤.
13.
3术术语语表表SLYZ022—TI术语表.
这份术语表列出并解释术语、首字母缩略词和定义.
14机机械械封封装装和和可可订订购购信信息息以下页中包括机械封装和可订购信息.
这些信息是针对指定器件可提供的最新数据.
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