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ATA555811M01-DDT Datasheet(PDF) 2 Page - ATMEL Corporation |
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ATA555811M01-DDT Datasheet(HTML) 2 Page - ATMEL Corporation |
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2 / 42 page  2 4681C–RFID–09/05 ATA5558 [Preliminary] The ATA5558 receives commands from the interrogator (downlink) as a 1 out of 4 pulse interval encoded, amplitude modulated signal. Return data transmission from the tag to the interrogator (uplink) utilizes either Manchester, Bi-phase or NRZ encoded amplitude modulation. This is achieved by controlled damping of the interrogator’s RF field with an on-chip resistive load between the two tag terminals, Coil 1 and Coil 2. Multi-Tag identification is implemented using a deterministic anticollision algorithm which requires unique tag identification information (Tag ID’s). Three blocks within the system memory are reserved for storage of the Tag ID, the length of which is user configurable up to a maximum of 96 bits. Figure 1-2. System Block Diagram 2. Functional Blocks 2.1 Analog Front End The analog front end (AFE) includes all circuitry directly associated with the coil interface. It gen- erates the internal power supply and handles the data communication with the interrogator. It consists of the following blocks: • Rectifier to generate a DC supply voltage from the AC coil voltage • Low-voltage regulator to provide an on-chip stabilized DC voltage • Charge pump to generate the high voltage required for EEPROM programming • On-chip tuning capacitor (mask option) • Field clock extractor • Field gap detector for data transmission from interrogator to tag • Load switching between Coil 1/Coil 2 for data transmission from tag to interrogator • Electrostatic discharge protection (ESD) System memory User memory (1kbit EEPROM) Modulator HV generator Input register Coil 1 Coil 2 * mask option Mode register Anticollision logic Controller POR |
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