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LRI64-MBTG Datasheet(PDF) 5 Page - STMicroelectronics |
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LRI64-MBTG Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 38 page 5/38 LRI64 SUMMARY DESCRIPTION The LRI64 is a contactless memory, powered by an externally transmitted radio wave. It contains a 120-bit non-volatile memory. The memory is orga- nized as 15 blocks of 8 bits, of which 7 blocks are accessible as Write-Once Read-Many (WORM) memory. Figure 2. Logic Diagram The LRI64 is accessed using a 13.56MHz carrier wave. Incoming data are demodulated from the re- ceived Amplitude Shift Keying (ASK) signal, 10% modulated. The data are transferred from the reader to the LRI64 at 26Kbit/s, using the “1-out- of-4” pulse encoding mode. Outgoing data are sent by the LRI64, generated by load variation on the carrier wave, using Manches- ter coding with a single sub-carrier frequency of 423kHz. The data are transferred from the LRI64 to the reader at 26Kbit/s, in the high data rate mode. The LRI64 supports the high data rate communi- cation protocols of ISO 15693 and ISO 18000-3 Mode 1 recommendations. All other data rates and modulations are not supported by the LRI64. Table 1. Signal Names Figure 3. MLP Connections Memory Mapping The LRI64 is organized as 15 blocks of 8 bits as shown in Figure 4. Each block is automatically write-protected after the first valid write access. Figure 4. LRI64 Memory Mapping The LRI64 uses the first 8 blocks (blocks 0 to 7) to store the 64-bit Unique Identifier (UID). The UID is used during the anti-collision sequence (Invento- ry). It is written, by ST, at time of manufacture, but part of it can be customer-accessible and custom- er-writable, on special request. The LRI64 has an AFI register, in which to store the Application Family Identifier value, which is also used during the anti-collision sequence. The LRI64 has a DSFID register, in which to store the Data Storage Format Identifier value, which is used for the LRI64 Inventory answer. The five following blocks (blocks 10 to 14) are Write-Once Read-Many (WORM) memory. It is possible to write to each of them once. After the first valid write access, the block is automatically locked, and only read commands are possible. AC1 Antenna Coil AC0 Antenna Coil AI08590 AC1 LRI64 AC0 Power Supply Regulator Manchester Load Modulator ASK Demodulator 120-bit WORM Memory 1 AI11612 2 3 4 8 7 6 5 AC0 AC1 n/c n/c n/c n/c n/c n/c AI09741 Block Addr 01234567 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 UID 0 UID 1 UID 2 UID 3 UID 4 UID 5 = IC_ID UID 6 = 02h UID 7 = E0h AFI (WORM Area) DSFID (WORM Area) WORM Area WORM Area WORM Area WORM Area WORM Area |
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