Passive Low Frequency Interface Device With EEPROM and …

1 SEPTEMBER2009 :TMS371571 FEATURESAPPLICATIONS WirelessBatterylessSensorInterfaceusing WideSupplyVoltageRange2 V UltraLowPowerConsumption MicrocontrollerandSensorcanbe APoweredThroughtheLFLink PowerDownMode60nA DataisDirectlyTransmittedOvertheLF 121 FreeBytesUserMemoryLinkFromtheBaseStatio nviatheTMS37157totheMicrcontrollerandVic e LowFrequencyHalbDuplex(HDX)InterfaceVers a. HDXT ransponderCommunication BatterylessConfigurationMemoryAchievingM aximumPerfomanceand MemorycanbeWrittenWithoutBatteryHighestN oiseImmunitySupport SpecialSelectiveAddressingModeAllows MicrocontrollercanReadtheContentoftheAnt iCollisionMemoryWhenIt GetsConnectedtoa Upto8 kbit/sLFUplinkDataRateBatteryandUseIt forConfiguration 126 ByteEEPROM.

2 MicrocontrollercanWritetheMemory,Whichca nbeReadOutLaterThroughthe 121 BytesFreeAvailableEEPROMUserLFLinkMemory UltraLowPowerDataLoggerMemory(Smart 32 BitUniqueSerialNumberMetering) 8 BitSelectiveAddress MemoryCanBeWrittenBya HighEEPROMF lexibilityMicrocontroller PagesareIrreversibleLockableand MemoryCanBeReadThroughLFInterfaceProtect ableWithoutBatterySupport BatteryCheckandBatteryChargeFunction MultiPurposeLFInterfacetoa Microcontroller ShortRangeRFInterfacetoa IntegratedResonanceFrequencyTrimmingareN otanOption Downlink AmplitudeShiftKeying UltraLowPowerModecanResultinan Uplink FrequencyShiftKeyingOverallPowerConsumpt ionof60nA 3 WireSPII nterfaceforAccessingthe

3 RemoteControlApplicationEEPROMandExchang ingDataWiththe CombinationWithanUHFT ransmitterorIRMicrocontrollerThroughtheL FInterfaceTransmitteranda C ,4mmx 4mmVQFNP ackage PowerManagementoftheTMS37157canPowerDown theMicrocontroller ThePushButtonDetectionCircuitcanPowerUpa Microcontroller StandAloneLF-TransponderwithMemory RFIDT ransponderwithUniqueIDand121 BytesFreeProgrammableEEPROMUserMemory OnlyFewAdditionalComponentsNeeded NoBatteryRequired1 Pleasebeawarethatanimportantnoticeconcer ningavailability,standardwarranty,anduse in 2009, Reader134,2 kHzTMS37157 MicrocontrollerLF DATAENERGYBase StationSensor SystemDigital or AnalogSensorTMS37157 SWRS083A SEPTEMBER2009 is theidealdeviceforanyConfiguration,DataLo gger-, accessiblethroughSPIandLFand,inthesecond case,operateswithouttheneedfora communicationina accessibleovertheLFinterfacewithoutsuppo rtfromthebatteryorthroughSPIbyamicrocont rollerif a batteryis LFcoilanda fewexternalcomponentsresultsin a 2009.

4 TexasInstrumentsIncorporatedProductFolde rLink(s):TMS37157116 15 14 SEPTEMBER2009 REVISEDNOVEMBER2009 shiftedin highwhentheRFsignalofthebasestationis (opendrain)- canbeusedtorecognizethata : DuringinitializationBUSY8O Duringtransponderoperation DuringSPIcommunication(handshaking) C supplyvoltageVBAT14 PWRB atterysupplyGND15 PWRG roundVCL16 PWRC hargecapacitorORDERINGINFORMATIONTAPACKA GE(1)(2)ORDERABLEPARTNUMBERTOPSIDEMARKIN G 40 C to85 CVQFN RSAR eelof3000 TMS37157 IRSARG437157I(1)Packagedrawings,thermald ata, (2)Forthemostcurrentpackageandorderingin formation,seethePackageOptionAddendumatt heendofthisdocument, 2009,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback3 ProductFolderLink(s).

5 TMS37157 TMS37157 SWRS083A SEPTEMBER2009 (1)overoperatingfree-airtemperaturerange (unlessotherwisenoted)MINMAXUNITTAO peratingfreeairtemperature 4085 CTsStoragetemperature(2) 40125 CVBATB atteryvoltage (3)10mA(1)Stressesbeyondthoselistedunder "absolutemaximumratings" ,andfunctionaloperationofthedeviceatthes eoranyotherconditionsbeyondthoseindicate dunder"recommendedoperatingconditions" is (2)Onecycleupto1000h(3)ContinuousOPERATI NGCONDITIONSPARAMETERMINTYPMAXUNITQopOpe ratingsystemqualityfactor VBATIVBAT= (VBAT VBATI)IBATI= 16mA,VBAT= AIchargeBatterychargecurrent2mAMODULATIO NCAPACITORPARAMETERMINNOMMAXUNITCMM odulationcapacitorL = 2009,TexasInstrumentsIncorporatedProduct FolderLink(s) SEPTEMBER2009 REVISEDNOVEMBER2009 VCL/VBATCHECKER(continued) (CT= CT1+CT2+.)

6 + CT7) ,SPI_SOMI,VBAT= ,RL= 100k VBUSYVBATVBATVOHH ighleveloutputvoltage,VBAT= ,RL= 100k VSPI_SOMI,BUSYVBATVBATVILL owlevelinputvoltage,SPI_SIMO,VBAT= ,RL= 100k VSPI_CLKVBATVIHH ighlevelinputvoltage,SPI_SIMO,VBAT= ,RL= 100k VBATVSPI_CLKVBATACTIVATIONLIMITOFTMS3715 7 PARAMETERMINNOMMAXUNITVactActivationleve lfortransponderf = (1) (1) thiscasethefunctionis guaranteedif componentsandICparametersareatthelimit,s eeFigure1 . Thevoltageis (Programming) 2009,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback5 ProductFolderLink(s) ChargeTMS37157 SWRS083A SEPTEMBER2009 C200000 CyclesXDRETD ataretentionTs= 25 C10 YearsTESTINTERFACEPARAMETERMINTYPMAXUNIT RTCLKPull-downresistor,TCLK71025k RTDATPull-downresistor,TDAT20150375k RTENPull-downresistor,TEN51025k VOLL owleveloutputvoltage,TDATVCL= 5V,RL= ,TDATVCL= 5V,RL= PulsePositionModulationtofftrpWritepulse pause(PPM)(1)170 stontrpLWritepulseactivation/lowbit(PPM) (1)

7 230 stontrpHWritepulseactivation/highbit(PPM )(1)350 stbittrpLWritelowbitperiod(1)400 stbittrpHWritehighbitperiod(1)(2)(3)5105 201730 s(1)Thistimingis measuredatthetransponderusinga withLowBitFrequency= (2)Exceptthelastbitthislimitationofthedu rationis validforalldownlinkbits.(3)Todetecta HighbittheabsoluteminimumoftbittrpH= 510 s , 2009,TexasInstrumentsIncorporatedProduct FolderLink(s):TMS37157II sho SEPTEMBER2009 REVISEDNOVEMBER2009 READERTIMINGSUSINGPPMPARAMETERMINTYPMAXU NITPPM- PulsePositionModulationtoffOfftime(PPM)( 1)170 stonLLowbitontime(PPM)(1)230 stbitLLowbitduration(PPM)(1)400 stonHHighbitontime(1)350 stbitHHighbitduration(PPM)(1)5201730 s(1)Timingrecommendationis onlyvalidfora ReaderOperatingQualityFactorQTX= QRX (1)Equivalentcurrentforoperation(TrueRMS ) (1)Thecircuitbelowis factorQopdependsonusedcomponents(L,C)

8 20msTcharge= 25msEquivalentforprogrammingactivationQo p 40to85 CEquivalentforprogrammingactivationQop 40to85 C CR= 470pF, 2%f= (dLR= )kHzdLR/LRdTTemperaturecoefficientofLR 40to85 C250ppm/KQLR(1)QualityfactorofLR25 C*Qop> 30(2)(1)60(1)Qopis Q factormeasuredwhendeviceis assembledonPCB.(2)Duetotesterlimitations currentlyonlythevaluegivenin 250ppm(1)NP0 QCRQ ualityfactor2000 RFOperatingvoltage2050 Vpp(1)Thistypeis recommended,if notemperaturecompensationis requiredforLRCopyright 2009,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback7 ProductFolderLink(s).

9 TMS37157 ANALOGFRONT ENDPOWERMANAGEMENTCONTROLUNITTENTDATTCLK RF1 VCLGNDPUSHTANSPONDER & USERMEMORYBUSYCLKA/MVBATVBATINPOREOBSPI_ SIMOSPI_SOMISPI_CLKTMS37157 SWRS083A SEPTEMBER2009 C198220242nFCLC hargecapacitorfmeas= 1 kHzCLdielDielectricofCLX7 RVCLO peratingvoltage16 VdcOTHERCOMPONENTSPARAMETERTESTCONDITION SMINNOMMAXUNITRVCLVCL resistorDependsonapplicationcircuit1M RloadVBATI loadresistorDependsonapplicationcircuit1 00k CBATB atterycapacitor100nFCBATIBATI capacitor100nFRECOMMENDEDTESTINTERFACEPA RAMETERSPARAMETERMINNOMMAXUNITVCLS upplyvoltagefortrim/test5 VVIHH ighlevelinputvoltage,TDAT,TCLK& VCLVVILL owlevelinputvoltage,TDAT,TCLK& VCLVfTclkClockfrequencyTCLK134kHztr, tfRiseandfalltime,TDAT,TCLK, stTresTestresettime14mstTrcTestresettocl ocktime1 stTdsTestdatasetuptime1 stTdhTestdataholdtime1 sTMS37157 BLOCKDIAGRAM8 SubmitDocumentationFeedbackCopyright 2009,TexasInstrumentsIncorporatedProduct FolderLink(s)

10 SEPTEMBER2009 enablesreceptionandtransmissionofLFsigna lswhenthetransponderisactive,andrectifie sincomingLFenergyandstoresit in anexternalchargecapacitor, 's resonancecircuitandaclockregeneratorfunc tion,whichis abletorecovertheclockfromanincomingsigna lsoit ' DST("DigitalSignatureTransponder") ,theControlUnitreadstheconfigurationpara metersstoredintheEEPROM andinitializestheTMS37157circuitryaccord ingly,andatvarioustimesduringdeviceopera tionit canreadEEPROM dataandprovideit, forexample,toa t