Transcription of Low-Frequency RFID in a Nutshell - Texas Instruments
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Low-Frequency RFID in a Nutshell - Texas Instruments
ApplicationReportSWRA284 September2011 Low-FrequencyRFIDina ,howtochoosetherightcomponents,andshowsb estpracticesfora guidelinefordesigninga RFIDS tickAntennaNeara (4ms/div)..33 ProgramPageCommandWithCorrectBCCandRespo nse(10ms/div)..44 ProgramPageWithIncorrectBCCandNoResponse (10ms/div)..45 PPMT imingfora September2011 Low-FrequencyRFIDin a NutshellSubmitDocumentationFeedbackCopyr ight 2011,TexasInstrumentsIncorporatedBase Station AntennaTransponder (LF)RFcommunicationtotherightpassivecomp onentsandfinallytoa (poweredbythemagneticfieldofa rfid reader)is chargephasein whicha capacitoris charged(TIhalfduplex(HDX)principle).Read -onlydevicesthensendtheirinformation(typ ically96bits).Read/writedevicesneedtorec eivea (forexample,forpassiveentryorpassivestar tdevices)usethedownlinkchanneltoreceivea commandviaLFandwakea microcontrollerif therightwakepatternis (downlinkanduplink)thatis showshowtopositiona RFIDS tickAntennaNeara FromtheRFIDBaseStationtotheRFIDT ransponderAnRFID communicationis ,whichis sentbythebasestation, typicalcommunicationconsistsofa chargephaseof25msto50ms,whichis readanda programcommandareshownin Figure2 andFigure3, detectsa toFigure4 showa completecommunicationexchangebetweena V/divRFvoltageatthetransponderantenna2 VCLBlue2 V/divVoltageattheVCLchargecapacitor3 EOBM agenta1 V/divEndofburstdetecto
Charge VCL Capacitor Read Page Command Response VCL Limit = 6 V Reached www.ti.com Low-FrequencyRF Communication The RF voltage is the voltage that is generated by the magnetic field of the RFID base station at the
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