3D Analog Front End: Migrating From TMS37122 …

1 1 SCBA032 August2012 SubmitDocumentationFeedbackCopyright 2012,TexasInstrumentsIncorporatedMigrati ngFromTMS37122and TMS37127to tms37126d3 ApplicationReportSCBA032 August2012 MigratingFromTMS37122and TMS37127to tms37126d3 SiegfriedLangnerABSTRACTTheTMS37122,TMS3 7127,and TMS37126devicesbelongto the PassiveEntryand PassiveStart(PEPS)productfamilyusedmainl yfor also usablein industrialapplicationsfor TMS37122and TMS37127devicesare becomingobsolete,this applicationreportdescribeshow to migrateto the TMS37126D3deviceas a of Figures1 Pin 127 (10101010) (5 Nibbles,3 Rows)..56 tms37127 (5 Nibbles,4 Rows)..67 TMS37126(5 Bytes,3 Rows)..68 SchematicTMS37122and AssignmentTMS37122and tms37127 (4 V Level).

2 710 ReplacementSchematicfor TMS37122and AssignmentTMS37126(5 V Level).. of (1)All trademarksare the propertyof theirrespectiveowners.(1)1 IntroductionThe IC consistsbasicallyof a threedimensionalanalogfrontendwith internalWakePatterndetection;two16-bitwa kepatternscan be freelyprogrammedand a sensitivitythresholdassignedfor standbymode,all threechannelsare activeand waitingfor an RF field containingthe phase,the currentconsumptionof the analogfrontendis extremelylow and the microcontrollercan be put in low-powermodeto August2012 SubmitDocumentationFeedbackCopyright 2012,TexasInstrumentsIncorporatedMigrati ngFromTMS37122and TMS37127to tms37126d3 The receptionof a correctwakepatternis indicatedby the wakesignalthat wakesup the microcontrollerfor functionalstandpoint,the TMS37126D3deviceis a supersetof the TMS37122and TMS37127devices.

3 But with ComparisonTableParameterand FunctionUnitTMS37122 tms37127 tms37126d3 CompatibilityEmbeddedpassiveTRPfunctiona lityby Microby MicroyesNumberof RF inputs(antennas) Antennainductance(PEPS)[mH] 10 Antennainductance( TRP)[mH] and [mVpp] and BA and BA and B Wakepatternlength[bit]164, 8, 164, 8, Watchdog selectable-yesyes Standbycurrent[ A] RSSI(currentsink)nonoyesnoProgrammerRI-A CC-PBOX-20RI-ACC-PBOX-20 PTB2noTestinterfaceEEPROM programmingvoltage[V] 30 TDATTENRF2ncNPORRF3 VCC_CUWDEENVBATVBATI ncncncMODTXTCLKRF1 VCLncAMMODGNDRSSIWAKEBUSYEOBACLKA/MncSPI _SIMOSPI_SOMISPI_CLKTMS3712612345678 TSSOP 16 GNDVCCORF3 TDATTENVBATEOBACLKA/MVCLRF1RF2 TCLKMODTXWDEENWAKETMS37122 August2012 SubmitDocumentationFeedbackCopyright 2012,TexasInstrumentsIncorporatedMigrati ngFromTMS37122and TMS37127to AssignmentThe graypins are additionalsignalsthat are availableon the Pin InterfaceSignalsThe TMS37126xdeviceshavean SPI interfacefor accessingEEPROM memoryas well as for usingdifferentfunctionalitieslike hardware(HW)

4 Encryptionor the blockcheckcharacter(BCC) the SPI interfaceis not used,the clockinputshouldbe connectedto GNDin orderto avoidspuriousclockpulses(for example,electrostaticdischarge). TMS122and TMS37127programmerbox cannotbe usedfor TMS37126isequippedwith an internalchargepumpto programthe EEPROM cells,the test interfaceneeds5 V box (PTBor PTB2)is usedfor TMS37127and TMS37126xbothhavean integratedwatchdogthat can be enabledby watchdogis not availablein the casethe deviceoperateswithoutWakePatterndetectio n,the watchdogresetsthe deviceif no clockisreceivedby the RF TMS37126xcan be configuredfor a 4-, 8-, or frontend can be configuredto operatewith or August2012 SubmitDocumentationFeedbackCopyright 2012,TexasInstrumentsIncorporatedMigrati ngFromTMS37122and TMS37127to TMS37127If a continuouscarrieris presentfor about2 ms to 5 ms, the devicewill wakeup and set the Wakeoutputto high (seeFigure2).

5 AThe EOBA signal(bluetrace)is the demodulatedLF TMS37122and 127 the TMS37126device,the wakeoutputis only set high if the continuousLF carrieris switchedoff andon again(seeFigure3).Figure3. 126 WakeupWithoutWakePattern0 Bit 0432 NIBBLEVWAKE A/ 1 Bit 3 Bit 0 Bit 3 Bit 0 Bit 3 Bit 0 Bit 3 Bit 0 Bit 301111111111111110 PPM THRESHOLDNOCLKA0 NOWIDE30 NOWIDE20 NOWAKE1100000000000000000000C_TELEGRC_WA IT00000000000000000000 Bit 3 Bit 0 Bit 152 ROWVWAKE B/ 1 VWAKE B/ 2/3 PASSIVE ENTRY WAKE PATTERNPASSIVE START WAKE PATTERNBit August2012 SubmitDocumentationFeedbackCopyright 2012,TexasInstrumentsIncorporatedMigrati ngFromTMS37122and TMS37127to the Wakepatterndetectionis enabled,the behaviorof the TMS37126deviceis identicalto theTMS37122and TMS37127devices(seeFigure4).

6 Figure4. WakeupWith8-BitWakePattern(10101010) TMS37122and TMS37127deviceshavedifferentconfigurable features,the configurationmemorycontainsan additionalrow. One row consistsof five TMS37126devicehas 5 bytesper (5 Nibbles,3 Rows)Figure5 showsthe memoryconfigurationof the TMS37122 (5 Nibbles,3 Rows)VWAKE A1 INTERNAL USEAFE CNTR DEFAFE FUNCTIONDEFINITION BVWAKE B1 VWAKE A2 VWAKE B2 VWAKE A3 VWAKE B3 ROW 0 ROW 1 ROW 2PE WAKE PATTERN PE WAKE PATTERNPS WAKE PATTERN PS WAKE PATTERNAFE FUNCTIONDEFINITION ABYTE 4 BYTE 3 BYTE 2 BYTE 1 BYTE 00 Bit 0432 NIBBLEVWAKE A/ 1 Bit 3 Bit 0 Bit 3 Bit 0 Bit 3 Bit 0 Bit 3 Bit 0 Bit 30 PPM THRESHOLDNOCLKANOWIDE3 NOWIDE2 NOWAKE1C_TELEGRC_WAITBit 3 Bit 0 Bit 152 ROWVWAKE B/ 1 VWAKE B/ 2/3 PASSIVE ENTRY WAKE PATTERNPASSIVE START WAKE PATTERNBit B/ 3 VWAKE B/ 2 VWAKE A/ 3 VWAKE A/ August2012 SubmitDocumentationFeedbackCopyright 2012,TexasInstrumentsIncorporatedMigrati ngFromTMS37122and TMS37127to (5 Nibbles,4 Rows)

7 Figure6 showsthe memoryconfigurationof the TMS37127has one morerow forconfigurationthanthe tms37127 (5 Nibbles,4 Rows) (5 Bytes,3 Rows)Figure7 showsthe memoryconfigurationof the configurationis byte wiseorganizedin comparisonto the TMS37122and the TMS37122and TMS37127programmerscannotbe usedfor the TMS37126device(alsosee ).Figure7. TMS37126(5 Bytes,3 Rows)CON1(2x4pin)2 TDAT4 TEN6 VBAT8 GND1 VCL3 TCLK5 WDEEN7 SPARE1 Test InterfaceGNDVCC0RF3 August2012 SubmitDocumentationFeedbackCopyright 2012,TexasInstrumentsIncorporatedMigrati ngFromTMS37122and TMS37127to tms37127 Figure8 showsthe principleschematicfor the details,see the device-specificreferencemanual.

8 Spec# SchematicTMS37122and SignalConnections(TMS37122and tms37127 )For configurationand resonancetuning(tuningcapacitorprogrammi ng)of the TMS37122and tms37127 ,the tool RI-ACC-PBOX-20is programmersupportsall necessarysignalswith a 4 V levelandprovidesthe 16 V EEPROM programmingvoltageat the TestInterfacePin AssignmentTMS37122and tms37127 (4 V Level)For programmingthe EEPROM cellsat the end of the telegram,the TENsignalis switchedto 16 V (2x4pin)2 TDAT4 TEN6 VBAT8 GND1 VCL3 TCLK5 WDEEN7 SPARE1 Test InterfaceTDATTENRF2 NPORRF3 VCC_CUWDEENVBATTCLKRF1 VCLAM_MODGNDRSSIWAKEBUSYRAIDTMS371261234 567830292827262524233 VTDATTENWDEENCBATGNDGNDTCLKWAKEEOBAL2C2L 3C3L1C1 VBatiVBATINC1NC2NC3NC4 MODTXGNDCL2 CLGND9101112131415 August2012 SubmitDocumentationFeedbackCopyright 2012,TexasInstrumentsIncorporatedMigrati ngFromTMS37122and TMS37127to showsthe principleschematicfor the details,see the device-specificreferencemanual:Spec#11-0 9-21-046 Figure10.

9 ReplacementSchematicfor TMS37122and (TMS37126)For configurationand resonancetuning(tuningcapacitorprogrammi ng)of the TMS37126,the tool RI-ACC-PTB2-00is programmersupportsall necessarysignalswith a 5 V EEPROM programmingvoltageis providedinternalto the TestInterfacePin AssignmentTMS37126(5 V Level)Bit 3NO_BACKUPVAR. tWRX ONNOT USEDBIT 7 BIT 6 BIT 5 BIT 4 BIT 2 BIT 1 BIT 0NO_IMMOBBWM THRESHOLDDEFAULT = 0111 DEFAULT = 0 DEFAULT = 0111 DEFAULT = 0111 DEFAULT = 0 DEFAULT = 0 DEFAULT = 0 NOT AVAILABLE IN August2012 SubmitDocumentationFeedbackCopyright 2012,TexasInstrumentsIncorporatedMigrati ngFromTMS37122and TMS37127to showsthe contentof the FunctionDefinitionByteB locatedin the MemoryBlock2 AntennaConnectthe 3D antennain sucha way as to havethe lowestmutualcouplingbetweenthe accomplishthat.

10 Contactthe antennasupplieror test it by interchangingthe high couplingis whenthe resonanceof the alreadytunedchannelis changedaftertuningone of the a higherESDimmunityadditionalESDprotection diodesmustbe ( TI ) technical,applicationor otherdesignadvice,servicesor information,including,but not limitedto,referencedesignsand materialsrelatingto evaluationmodules,(collectively, TI Resources ) are intendedto assistdesignerswho aredevelopingapplicationsthat incorporateTI products;by downloading,accessingor usingany particularTI Resourcein any way,you(individuallyor, if you are actingon behalfof a company,yourcompany)agreeto use it solelyfor this purposeand subjectto the termsofthis s provisionof TI Resourcesdoesnot expandor otherwisealterTI s applicablepublishedwarrantiesor warrantydisclaimersfor TIproducts,and no additionalobligationsor liabilitiesarisefromTI providingsuchTI reservesthe rightto makecorrections,enhancements,improvement sand otherchangesto its TI understandand agreethat you remainresponsiblefor usingyourindependentanalysis,evaluationa nd judgmentin designingyourapplicationsand that you havefull and exclusiveresponsibilityto assurethe safetyof yourapplicationsand complianceof yourapplications(andof all TI productsusedin or for yourapplications)