AS3991 UHF RFID Reader IC

	AS3991 UHF RFID Reader IC

ams' UHF RFID reader chip with built-in programming options

ams' AS3991 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 only requires a standard 8-bit microcontroller and a minimum number of other components.

The AS3991 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. Either the interface to the microcontroller can be a 4-pin serial data interface (SDI) or an 8-bit parallel interface if high data rates are necessary. Frame management is accomplished using a 12-byte FIFO in order to decrease processor workload, ensure a smooth data stream, and correct protocol handling. All low level transmission codecs and CRC generation is done internally.

Features
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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 960MHz 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 have 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