AS3991 UHF RFID Reader IC
UHF RFID Single Chip Reader EPC Class1 Gen 2 Compatible with Integrated PA
Description
The AS3990/91 UHF reader chip is an integrated analog front-end and data framing system for a 900MHz RFID reader system. Built-in programming options make it suitable for a wide range of applications in UHF RFID systems. Designed to simplify the design and implementation of an EPC Class1 Gen2 reader, this IC requires only a standard 8-Bit microcontroller with minimal other components.
The AS3990/91 comprises the EPC Class1 Gen 2 protocol (ISO 18000-6c) with digital high speed logic up to the framing level and supports the ISO 18000-6a and ISO 18000-6b Protocol with direct data mode. The Interface to the microcontroller can be either a 4-pin serial data Interface (SDI) or alternatively in case of high data rates are necessary an 8-Bit parallel. The frame management will be done using a 12 Byte FIFO in order to decrease processor workload and ensure a smooth data stream and correct protocol handling. All low level transmission codecs and CRC generation is done internally.
Key Features
- Fully compliant with ISO 18000 6a, 6b, 6c and EPC Class1 Gen2 protocol using external MCU
- EPC Class1 Gen2 framing support using low cost 8-Bit microcontroller
- Direct data mode in the frequency range of 860 to 960 MHz enables propriety Protocol support
- Internal power amplifier with level controlled 20dBm for short range applications (only available on the AS3991)
- Modulator using ASK or PR-ASK modulation
- Adjustable ASK modulation index
- Automatic selection between I and Q Signal ensuring no “communication holes”
- Built-in reception low-pass and high-pass filters having selectable corner frequencies
- On chip VCO and PLL covering complete RFID frequency range and frequency hopping support
- Selectable receiver gain with AGC
- Supported link frequencies from 40 up to 640kHz
Applications
- Barcode label printers
- Add-on module for handheld computers, PDA
- Point of sales
- Currency reader
- UHF RFID reader systems
- Hand-held UHF RFID readers
- Toll systems
- Mobile phones
