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T555701M01-DDT Datasheet(PDF) 4 Page - ATMEL Corporation |
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T555701M01-DDT Datasheet(HTML) 4 Page - ATMEL Corporation |
4 / 30 page 4 T5557 4517E–RFID–02/03 Modulator The modulator consists of data encoders for the following basic types of modulation: Table 1. Types of e5550-compatible Modulation Modes Notes: 1. A common multiple of bitrate and FSK frequencies is recommended. 2. In PSK mode the selected data rate has to be an integer multiple of the PSK sub-carrier frequency. Memory The memory is a 330-bit EEPROM, which is arranged in 10 blocks of 33 bits each. All 33 bits of a block, including the lock bit, are programmed simultaneously. Block 0 of page 0 contains the mode/configuration data, which is not transmitted during regular-read operations. Block 7 of page 0 may be used as a write protection password. Bit 0 of every block is the lock bit for that block. Once locked, the block (including the lock bit itself) is not re-programmable through the RF field again. Blocks 1 and 2 of page 1 contain traceability data and are transmitted with the modula- tion parameters defined in the configuration register after the opcode ’11’ is issued by the reader (see Figure 11). These tracebility data blocks are programmed and locked by Atmel. Figure 4. Memory Map Mode Direct Data Output FSK1a (1) FSK/8-/5 ‘0’ = rf/8; ‘1’ = rf/5 FSK2a (1) FSK/8-/10 ‘0’ = rf/8; ‘1’ = rf/10 FSK1 (1) FSK/5-/8 ‘0’ = rf/5; ‘1’ = rf/8 FSK2 (1) FSK/10-/8 ‘0’ = rf/10; 1’ = rf/8 PSK1 (2) Phase change when input changes PSK2 (2) Phase change on bit clock if input high PSK3 (2) Phase change on rising edge of input Manchester ‘0’ = falling edge, ‘1’ = rising edge Biphase ‘1’ creates an additional mid-bit change NRZ ‘1’ = damping on, ‘0’ = damping off L L L L L L L L Block 7 Block 6 Block 5 Block 4 Block 3 Block 2 Block 1 Block 0 User data or password 32 bits User data User data User data User data User data User data Configuration data 132 0 Not transmitted Block 2 Block 1 Traceability data Traceability data 1 1 |
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