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AS3990

Part Number	AS3990
Manufacturer	austriamicrosystems AG
Description	UHF RFID single chip reader EPC
Published	Mar 14, 2010
Detailed Description	PRELIMINARY INFORMATION: SUBJECT TO CHANGE WITHOUT ANY NOTICE Data Sheet AS3977 www.DataSheet4U.com UHF RFID single c...
Datasheet	AS3990 PDF File

Overview

PRELIMINARY INFORMATION: SUBJECT TO CHANGE WITHOUT ANY NOTICE Data Sheet AS3977 www.
DataSheet4U.
com 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 • • • • • • • • Barco...

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