Passive Low Frequency Interface Device With …

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: 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 RemoteControlApplicationEEPROMandExchang ingDataWiththe CombinationWithanUHFT ransmitterorIRMicrocontrollerThroughtheL FInterfaceTransmitteranda C.

2 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,TexasInstrumentsIncorporatedProduct FolderLink(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).

3 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+..+ 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.

4 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)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) 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.

5 (2)Duetotesterlimitationscurrentlyonlyth evaluegivenin 250ppm(1)NP0 QCRQ ualityfactor2000 RFOperatingvoltage2050 Vpp(1)Thistypeis recommended,if notemperaturecompensationis requiredforLRCopyright 2009,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback7 ProductFolderLink(s):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)

6 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 tocommunicatewitha ,forexample,themicrocontrolleris testinterfacethatallowscustomerstotrimth eLFantenna's totalof126bytes, apportionedasfollows: UserData121bytes SerialNumber+ ManufactorerCode4 bytes SelectiveAddress1 byteCopyright 2009,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback9 ProductFolderLink(s):TMS37157 LSBMSBUNIQUE IDENTIFICATIONSELECT. ADDRESSDATAUSER 1 PAGE 2 PAGE DATAUSER DATAUSER DATAUSER DATAUSER DATALOCKLOCKLOCKLOCKLOCKPAGE 8 PAGE 9 PAGE 10 PAGE 11 PAGE 12 DATALOCKDATALOCKDATALOCKPAGE 13 PAGE 14 PAGE 15 USER DATAUSER DATAUSER DATADATADATADATADATADATATMS37157 SWRS083A SEPTEMBER2009 2009,TexasInstrumentsIncorporatedProduct FolderLink(s).

7 TMS371571 LSBMSBUSER DATALOCK403224168 LOCKLOCKLOCKLOCKLOCKLOCKLOCKPAGE 46 PAGE 47 PAGE 48 DATADATALOCKDATALOCKDATALOCKPAGE 49 PAGE 50 PAGE 51 DATADATADATADATADATADATALOCKDATAUSER DATAUSER DATAUSER DATAUSER DATAUSER DATAUSER DATAUSER DATAUSER DATAUSER DATAUSER DATAUSER DATADATALOCKPAGE 52 DATALOCKDATALOCKDATALOCKPAGE 53 PAGE 54 PAGE 55 DATAUSER DATAUSER DATAUSER DATAUSER DATAPAGE 40 PAGE 41 PAGE 42 PAGE 43 PAGE 44 PAGE SEPTEMBER2009 REVISEDNOVEMBER2009 SelectiveAddressPage1 ofthetranspondermemorycontainsa SelectiveAddress(password) usedforselectiveprogramming,selectiveloc king, command(aslongastheSelectiveAddresslockb itis notset).Thelockbitcanbesetbytheuserviath elockpage1 , ,theusermustwritea theSelectiveAddressis not0xFF,it is theSelectiveAddressis 0xFF(thefactorydefault),nosuchcomparison is performedandselectiveaddressingis 2009,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback11 ProductFolderLink(s):TMS37157 TMS37157 SWRS083A SEPTEMBER2009 ,2 or3 areaccessed,theSelectiveAddress(frompage 1)is returnedinthecorrespondingreadphase,toge therwithpage2 andtheManufacturerCodeandSerialNumber(fr ompage3).

8 Thestatusofthepage1 lockbit(1=locked)is onlyreturnedwhenpage1 is ofthetranspondermemorycontains8 is typicallyusedfornumberingkeysin anapplication( ),it maybeprogrammedbytheuserusingtheprogramp age2 command(aslongasthelockbitisnotset). , ,2 or3 areaccessed,page2 is returnedinthecorrespondingreadphase,toge therwiththeSelectiveAddress(frompage1)an dtheManufacturerCodeandSerialNumber(from page3).Thestatusofthepage2 lockbit(1=locked)is onlyreturnedwhenpage2 is ofthetranspondermemorycontainsan8-bitMan ufacturerCodeanda ,theManufacturerCodeoftheTMS37157is ,2 or3 areaccessed,theManufacturerCodeandSerial Number(frompage3)arereturnedinthecorresp ondingreadphase,togetherwiththeSelective Address(frompage1) lockbit(1=locked)is onlyreturnedwhenpage3 is ,8 2009,TexasInstrumentsIncorporatedProduct FolderLink(s) +IBATBATIVBATIONVBATICBATIRVBATIVCCDBUSY SPI_ SEPTEMBER2009 REVISEDNOVEMBER2009 POWERMANAGEMENTThePowerManagementblockis responsibleforthemastercontrolofallpower suppliesplusseveraladditionaltasks,sucha srespondingwhena pushbuttonis pressed, blockdiagramofthepowermanagementfunction is shownin Figure3.

9 Activationofa pushsignalis highsignalatPUSH,theonlyactivecomponenti ntheTMS73157is a flip-flop,whoseoutputis setwhenPUSHis ,SW5is ,afterperformingitsdesiredactions,senda PowerDownCommandtotheTMS37157,bringingth eTMS37157intheultralowpowermode(theFlipF lipisclearedandVBATI isdisconnectedwaitingfora , C tofetchthedata,processit it detectsa ,becausetheTMS37157 ControlUnitis poweredoutoftheRF- 2009,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback13 ProductFolderLink(s):TMS37157 TMS37157 SWRS083A SEPTEMBER2009 = 0xFFSelectiveAddressingPage1 <> 0xFFStandardconfigurationis activatedbyprogramminga valueotherthan0xFFintopage1 ,ProtectPage(notavailableforPage1-3)andP rogramPagecommandsforpage1 ReadPageofpage1 3 GeneralReadis 3 a selectiveprogrampage1 programcommandona 2009,TexasInstrumentsIncorporatedProduct FolderLink(s) SEPTEMBER2009 REVISEDNOVEMBER2009 PULSEPOSITIONMODULATIONWithPulsePosition Modulationtheinformationis carriedin theperioddurationofa bit(tbitL, tbitH).)

10 A bitconsistsofa pulsepause(toff) anda pulseactivation(tonL, tonH).Thedifferenceofperioddurationsatth ereadermustbeselectedinwaythatincaseofa lowbitthedurationatthetransponderlocatio nislowerthantheHighBitThresholdDetection Time(tHdet).Fora highbit,thebitdurationmusatthetransponde rlocationmustbehigherthattheHighBitThres holdDetectionTime(tHdet). thePausebetweentopositivetransitionsofEO Bis atleastaslongastHdettheTransponderwrites a writesa 2009,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback15 ProductFolderLink(s):TMS37157 TMS37157 SWRS083A SEPTEMBER2009 program,lockorprotectcommanda RFburstfromthetransmitterisneededaftertr ansmittingtheprogram,lockorprotectcomman d, 2009,TexasInstrumentsIncorporatedProduct FolderLink(s) SEPTEMBER2009 REVISEDNOVEMBER2009 TMS37157 COMMANDST hischapterdescribesthecommandsanddatatha tcanbetransferredtoandfromtheTMS37157via itscontactlessLFinterface, : DataTransmissionfromthebasestationtothet ransponderis called write and writedataaretransferred.