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Communication protocols on the LRI64 Long Range RFID Memory IC

Posted: 24 Sep 2009 ?? ?Print Version ?Bookmark and Share

Keywords:RFID? memory IC? LRI64 communication protocols?

ST LRI64 is an RFID memory IC powered by an externally transmitted radio wave. The memory is organized as 15 blocks of 8bits each, of which seven blocks are accessible as write-once read-many (WORM) memory. The first 64bits are one time programmable and can be used to store a Unique Identification number (UID).

The LRI64 is used for tags that operate in the long rangethat is up to 1.5m from the coupling device. The LRI64 consequently complies with the ISO 15693-2 standard that specifies the nature and characteristics of the fields to be provided for power and bi-directional communications between the Vicinity Coupling Device (reader) and the Vicinity Cards (tags). The LRI64 also complies with RF regulations emitted by local organizations such as European Telecommunications Standards Institute or FCC.

Among the 16 bi-directional protocols specified by the ISO 15693-2 standard, ST has adopted and implemented the following protocols to communicate between the reader and the LRI64-based tags:

? Communications reader to tag
- Modulation: The data sent by the reader are demodulated from the incoming ASK signal, 10 percent modulated.
- Data coding: The data are transferred from the reader to the tag using the 1-out-of- 4 (1/4) data coding mode.

? Communications tag to reader:
- Subcarrier: Load modulation using Manchester coding with one single 423kHz subcarrier.
- Data rate: fast data rate (26Kbit/s).

This application note aims to analyze the different solutions and to describe the advantages of the LRI64 protocols.

View the PDF document for more information.

Click here to view related datasheets.





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