AS3991-BQFT austriamicrosystems, AS3991-BQFT Datasheet

AS3991-BQFT

Manufacturer Part Number

AS3991-BQFT

Description

IC UHF RFID READER 64-QFN

Manufacturer

austriamicrosystems

Datasheets

1.AS3991-BQFT.pdf (3 pages)

2.AS3991-BQFT.pdf (51 pages)

Specifications of AS3991-BQFT

Rf Type

Read / Write

Frequency

840MHz ~ 960MHz

Features

ISO-18000-6

Package / Case

64-VFQFN, Exposed Pad

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

AS3991-BQFT
AS3991-BQFTTR

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A S 3 9 9 0 / A S 3 9 9 1

U H F R F I D S i n g l e C h i p R e a d e r E P C C l a s s 1 G e n 2 C o m pa t i b l e

1 General Description

The AS3990/AS3991 UHF reader chip is an integrated

analog front end and protocol handling system for a

ISO18000-6C 900MHz RFID reader system.

Equipped with built-in programming options, the device

is suitable for a wide range of applications in UHF RFID

systems.

The reader configuration is achieved by selecting the

desired protocol in control registers. Direct access to all

control registers also allows fine tuning of different

reader parameters, if needed.

Parallel or serial interface can be selected for

communication between the host system (MCU) and the

reader IC. When hardware coders and decoders are

used, transmission and receive data is transferred via.

24 bytes FIFO register.

In case of direct transmission or reception, coders and

decoders are bypassed and the host system has to

service the analog front end in real time.

The transmitter generates 20dBm output power into 50Ω

load and is capable of ASK or PR-ASK modulation. The

integrated supply voltage regulators ensure supply

rejection of the complete reader system.

The transmission system comprises low level data

coding. Automatic generation of FrameSync, Preamble,

and CRC is supported.

The receiver system allows AM and PM demodulation.

The receiver also comprises automatic gain control

option (patent pending) and selectable gain and signal

bandwidth to cover a range of input link frequency and

bit rate options.

The signal strength of AM and PM modulation is

measured and can be accessed in RSSI register.

The receiver output is selectable between digitized sub-

carrier signal and any of integrated sub-carrier

decoders. Selected decoders deliver bit stream and data

clock as outputs.

The receiver system also comprises framing system.

This system performs the CRC check and organizes the

data in bytes. Framed data is accessible to the host

system through a 24 byte FIFO register.

To support external MCU and other circuitry a 3.3V

regulated supply and clock outputs are available. The

regulated supply has 20mA current capability.

The AS3990/AS3991 is available in a 64 pin QFN (9mm

x 9mm), ensuring the smallest possible footprint.

www.austriamicrosystems.com

Revision 3.0

2 Key Features

3 Applications

The device is an ideal solution for UHF RFID reader

systems and hand-held UHF RFID readers.

ISO18000-6C (EPC Gen2) full protocol support

ISO18000-6A,B compatibility in direct mode

Integrated low level transmission coding

Integrated low level decoders

Integrated data framing

Integrated CRC checking

Parallel 8-bit or serial 4 pin SPI interface to MCU

using 24 bytes FIFO

Voltage range for communication to MCU between

1.8V and 5.5V

Selectable clock output for MCU

Integrated supply voltage regulator (20mA), which

can be used to supply MCU and other external

circuitry

Integrated supply voltage regulator for the RF output

stage, providing rejection to supply noise

Internal power amplifier (20dBm) for short range

applications

Modulator using ASK or PR-ASK modulation

Adjustable ASK modulation index

AM & PM demodulation ensuring no

“communication holes” with automatic I/Q selection

Built in reception low-pass and high-pass filters

having selectable corner frequencies

Selectable reception gain

Reception automatic gain control

AD converter for measuring TX power using

external RF power detector

DA converter for controlling external power amplifier

Frequency hopping support

On-board VCO and PLL covering complete RFID

frequency range 840MHz to 960MHz

Oscillator using 20MHz crystal

Power down, standby and active mode

Can be powered by USB with no need for step

conversion

P r o d u c t B r i e f

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Related parts for AS3991-BQFT

AS3991-BQFT Summary of contents

Page 1

... FIFO register. To support external MCU and other circuitry a 3.3V regulated supply and clock outputs are available. The regulated supply has 20mA current capability. The AS3990/AS3991 is available pin QFN (9mm x 9mm), ensuring the smallest possible footprint. www.austriamicrosystems.com 2 Key Features ...

Page 2

... RFONX 32 Directional RFOPX 33 unit 56 EXT_IN 36 OCSI 37 OSCO 60 VCO www.austriamicrosystems.com 4xC 2xC AS3990/ Regulators AS3991 References Gain IQ Down Filter Conversion Digitizer Mixer Digitizer AFE RF Out RSSI EPC Gen2 Protocol Handling GEN-2 24 Frame Gen Byte FIFO CRC Revision 3.0 38 VDD_D VDD_RF 18 VDD_B 19 Supply ...

Page 3

... AS3990/AS3991 Product Brief Copyrights Copyright © 1997-2008, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. ...

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