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| PRELIMINARY INFORMATION: SUBJECT TO CHANGE WITHOUT ANY NOTICE Data Sheet AS3977 UHF RFID single chip reader EPC Class1 Gen2 compatible AS3990 General Description The AS3990 UHF reader chip is an integrated analogue 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 Class 1Gen2 reader, this IC requires only a standard 8Bit microcontroller with minimal other components. The AS3990 comprises the EPC Class 1- Gen2 protocol (ISO 18000-6c) with digital high speed logic up to the framing level and supports the ISO 180006a and ISO 18000-6b Protocol with direct data mode. The Interface to the microcontroller can be either a 4 pin serial date Interface (SDI) or alternatively in case of high data rates are necessary an eight 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 codec's and CRC generation is done internally. An on chip level shifter with a special supply pin can be used to adapt microcontroller supply voltages in the range of 1.8- 3.3V for optimized power usage. In order to reduce the BOM, an integrated LDO with driver strength of 20mA can be used to supply the microcontroller. Additional regulators for the RF section suppress disturbances and thus allow noisy main supply. A 20MHz crystal is used for the reference oscillator. Using this reference, an additional programmable glitch free clock output can be used to clock the microcontroller thus saving costs and current. In addition, by using the integrated power management features modes power-down, standby and active it is possible to shut down or reduce the microcontroller clock and hence save additional power. Preliminary Information 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 Key Features * * * * * * * * * * * Fully compliant with ISO 18000 6a, 6b, 6c and EPC Class 1- Gen2 protocol using external MCU EPC Class 1 -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 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 Package * 64 pin QFN 9*9 Revision 1.2, 20.09.2007 Page 1 of 2 Data Sheet AS3990 UHF reader Block and Application Diagram 4xC VDD_MIX VDD_TXPAB 2xC COMP_A COMP_B COMN_A COMN_B VDD_5LFI 6 4 2 1 3 5 5 3 5 2 1 3 1 5 OAD OAD_2 ADC DAC AS3990 31 30 58 4 Supply Regulators & Refernces VEXT VEXT2 1 6 1 7 38 18 19 54 59 CD1 CD2 MIX_INP MIX_INN MIXS_IN RFOUTN_1 RFOUTN_2 RFOUTP_1 RFOUTP_2 RFONX RFOPX EXT_IN VCO OSCI OSCO VOSC CP 7 9 10 Double DownConversion Mixer Gain Filter Digitizer 63 34 51 41 Digitizer VDD_D VDD_RF VDD_B AGD VDD_A VDD_LF VDD_RFP 7xC 42 43 RF Out MCU Interface 27 28 20 21 32 33 56 60 36 Oscillator & Timing System EPC Gen2 Protocol Handling RSSI AFE 44 45 46 47 48 50 39 40 49 VDD_IO IO0 IO1 IO2 IO3 IO4 Micro IO5 controller IO6 IO7 CLK EN IRQ CLSYS Directional unit EPC Gen2 Protocol Handling GEN-2 Frame Gen CRC 12 Byte FIFO 5 5 5 7 6 5 37 61 62 6 8 1 1 1 2 1 4 2 2 2 3 2 4 2 5 2 6 2 9 3 5 Contact austriamicrosystems AG A 8141 Schloss Premstatten, Austria T. +43 (0) 3136 500 0 F. +43 (0) 3136 525 01 wireless@austriamicrosystems.com Disclaimer Preliminary Data Sheet is product information in formative or design phase of development. Characteristic data and other specifications are design goals. austriamicrosystems reserves the right to change or discontinue such products without notice. Revision No. 1.2, Date: 09-2007 Page 2 of 2 Copyright (c) 2007 austriamicrosystems. Trademarks registered (R). 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. To the best of its knowledge, austriamicrosystems asserts that the information contained in this publication is accurate and correct. VSS VSS VSN_MIX CBIB CBV5 VSN_1 VSN_2 VSN_3 VSN_4 VSN_5 VSN_D VSN_RFP VSN_A VSN_CP EXP_PAD |
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