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ATA5551M-PPMY Datasheet(PDF) 8 Page - ATMEL Corporation |
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ATA5551M-PPMY Datasheet(HTML) 8 Page - ATMEL Corporation |
8 / 28 page ATA5551M-PPMY [DATASHEET] 9334B–RFID–05/14 8 4.3 Operating the Atmel e5551 4.3.1 General The basic functions of the Atmel® e5551 are: supply IC from the coil, read data from the EEPROM to the reader, write data into the IC and program these data into the EEPROM. Several errors can be detected to protect the memory from being written with the wrong data (see Figure 4-21 on page 15). 4.3.2 Supply The Atmel e5551 is supplied via a tuned LC circuit which is connected to the Coil 1 and Coil 2 pads. The incoming RF (actually a magnetic field) induces a current into the coil. The on-chip rectifier generates the dc supply voltage (VDD, VSS pads). Overvoltage protection prevents the IC from damage due to high-field strengths. Depending on the coil, the open- circuit voltage across the LC circuit can reach more than 100V. The first occurrence of RF triggers a power-on reset pulse, ensuring a defined start-up state. 4.3.3 Read Reading is the default mode after power-on reset. It is done by switching a load between the coil pads on and off. This changes the current through the IC coil, which can be detected from the reader unit. 4.3.4 Start-up The many different modes of the Atmel e5551 are activated after the first readout of block 0. The modulation is off while block 0 is read. After this set-up time of 256 field clock periods, modulation with the selected mode starts. Any field gap during this initialization will restart the complete sequence. 4.3.5 Read Datastream The first block transmitted is block 1. When the last block is reached, reading restarts with block 1. Block 0, which contains mode data, is normally never transmitted. However, the mode register is continuously refreshed with the contents of EEPROM block 0. Figure 4-7. Application Circuit Figure 4-8. Voltage at Coil1/Coil2 after Power-on Tuned LC Reader coil Energy IAC 125kHz Data e5551 ≤ 2ms * FC → Field clocks Power-on Reset Loading block 0 (256 FC ≈ 2ms) Read data with configured modulation and bitrate Damping on VCoil 1 - Coil2 Damping off |
Similar Part No. - ATA5551M-PPMY_14 |
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Similar Description - ATA5551M-PPMY_14 |
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