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T555711M01-PAE Datasheet(PDF) 2 Page - ATMEL Corporation |
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T555711M01-PAE Datasheet(HTML) 2 Page - ATMEL Corporation |
2 / 30 page 2 T5557 4517E–RFID–02/03 T5557 – Building Blocks Figure 2. Block Diagram Analog Front End (AFE) The AFE includes all circuits which are directly connected to the coil. It generates the IC’s power supply and handles the bi-directional data communication with the reader. It consists of the following blocks: • Rectifier to generate a DC supply voltage from the AC coil voltage • Clock extractor • Switchable load between Coil 1/Coil 2 for data transmission from tag to the reader • Field gap detector for data transmission from the base station to the tag • ESD protection circuitry Data-rate Generator The data rate is binary programmable to operate at any data rate between RF/2 and RF/128 or equal to any of the fixed e5550/e5551 and T5554 bitrates (RF/8, RF/16, RF/32, RF/40, RF/50, RF/64, RF/100 and RF/128). Write Decoder This function decodes the write gaps and verifies the validity of the data stream according to the Atmel e555x write method (pulse interval encoding). HV Generator This on-chip charge pump circuit generates the high voltage required for programming of the EEPROM. DC Supply Power is externally supplied to the IDIC via the two coil connections. The IC rectifies and regulates this RF source and uses it to generate its supply voltage. * Mask option * Coil 1 Coil 2 Modulator POR Input register Memory (330 bit EEPROM) Controller Test logic Mode register HV generator |
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