Atmel ATA5577C 125kHz无接触RFID IDIC读写器解决方案

关键词： ATA5577C , Atmel , IDIC , RFID , 读写器

Atmel公司的 ATA5577C是100kHz-150kHz的无接触读/写 IDIC,单个线圈连接带芯片，用作IC的电源和双向通信接口，天线和芯片一起组成异频雷达收发机或标签。器件具有353位EEPROM存储器（7x32位EEPROM为用户存储器包括32位密码存储器，2x32位用作ID，1x32位为选择用寄存器），和ISO/IEC 11784/785兼容，主要用在下一代接入控制如宾馆客房，工程部门，办公室，停车场，时间记录系统，会员卡等。本文介绍了ATA5577C主要特性，方框图以及RFID系统框图，基于AVR的125kHz RFID评估套件主要特性以及系统框图。

Read/Write LF RFID IDIC 100 to 150kHz

The Atmel® ATA5577C is a contactless read/write IDentification IC (IDIC®) for applications in the 125kHz or 134kHz frequency band. A single coil connected to the chip serves as the IC’s power supply and bi-directional communication interface. The antenna and chip together form a transponder or tag.

The on-chip 363-bit EEPROM (11 blocks with 33 bits each) can be read and written block-wise from a base station (reader).

Data is transmitted from the IDIC (uplink) using load modulation. This is achieved by damping the RF field with a resistive load between the two terminals, coil 1 and coil 2. The IC receives and decodes serial base station commands (downlink), which are encoded as 100% amplitude modulated (OOK) pulse-interval-encoded bit streams.

The Atmel ATA5577C is designed to be compatible with the Atmel T5557/ATA5567. The structure of the configuration register is identical. The two modes, basic mode and extended mode, are also available. The Atmel ATA5577C is able to replace the Atmel e5551/T5551 in most common operation modes. In all applications, the correct functionality of the replacements must be evaluated and proved.

ATA5577C主要特性：

• Contactless Power Supply
• Contactless Read/Write Data Transmission
• Radio Frequency fRF from 100kHz to 150kHz
• Basic Mode or Extended Mode
• Compatible with Atmel T5557, ATA5567
• Replacement for Atmel e5551/T5551 in Most Common Operation Modes
• Configurable for ISO/IEC 11784/785 Compatibility
• Total 363 Bits EEPROM Memory: 11 Blocks (32 Bits + 1 Lock Bit)
– 7x32 Bits EEPROM User Memory, Including 32-bit Password Memory
– 2x32 Bits for Unique ID
– 1x32-bit Option Register in EEPROM to Set Up the Analog Front End:
• Clock and Gap Detection Level
• Improved Downlink Timing
• Clamp and Modulation Voltage
• Soft Modulation Switching
• Write Damping like the Atmel T5557/ATA5567 or with Resistor
• Downlink Protocol
– 1x32-bit Configuration Register in EEPROM to Set Up:
• Data Rate:
– RF/2 to RF/128, Binary Selectable or
– Fixed Basic Mode Rates
• Modulation/Coding:
– Bi-phase, Manchester, FSK, PSK, NRZ
• Other Options:
– Password Mode
– Max Block Feature
– Direct Access Mode
– Sequence Terminator(s)
– Blockwise Write Protection (Lock Bit)
– Answer-On-Request (AOR) Mode
– Inverse Data Output
– Disable Test Mode Access
– Fast Downlink (~6Kbits/s versus ~3Kbits/s)
– OTP Functionality
– Init Delay (~67ms)
• High Q-antenna Tolerance Due to Build in Options
• Adaptable to Different Applications: Access Control, Animal ID and Waste
Management
• On-chip Trimmed Antenna Capacitor:
– 250pF/330pF (±3%)
– 75pF/130pF (On Request)
– Without On-chip Capacitor (On Request)
• Pad Options
– Atmel ATA5577M1C
• 100μmx100μm for Wire Bonding or Flip Chip
– Atmel ATA5577M2C
• 200μmx400μm for Direct Coil Bonding

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图1。ATA5577C方框图

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图2。采用ATA5577C标签的RFID系统框图

基于AVR的125kHz RFID评估套件

Radio Frequency Identification (RFID) has been used for more than a decade and still provides growing benefits most commonly associated with Access Control (employee badge entry), Animal ID (ear tags or pet injectables), and Auto Immobilizer (theft prevention); RFID can be used for many additional applica tions. The large variety of transponder features now offered allows for maximized ROE of potential systems. An RFID Reader or Interrogator functions by passing an alternating current through an air-core coil thereby generating an electromagnetic field. The magnetic field provides all of the power needed to operate the Tag, or Transponder. This source of power eliminates the need for a separate power supply on the tag and thereby reduces the size, cost, and any placement constraints. In this case the RF field operates at 125kHz. The tag responds by manipulating this RF Field.

125kHz RFID评估套件主要特性：

– Large 128x64 Graphic LCD with backlighting
4-way Joystick with center press
– 4 configurable pushbuttons
– Plug-in Connectors accept modular RFID Reader Boards
9-16V Power supply with reverse polarity protection
3V Battery backup circuit to preserve Real-Time Clock function
Soft-power switch to shutdown system for battery operation
Fully compatible AVR Tools Interface Connectors (JTAG/ISP)
– RS232 Interface and Serial API (Application Program Interface) support

125kHz RFID评估套件包括：

The kit features four basic components: the reader system, sample tags, sample ICs, and a CDROM. These basic components are comprised of the items shown below.

The reader system

ATA2270-EK1 Main Board (1)
– ATA2270-EK1 Reader Board (1)
– 125kHz RFID Antenna Coil (1)
– Coin cell battery (CR 2032 3V Li)
– Universal Power Supply

Sample Tags

TK5530 (3)
TK5551 (3)
ATA5567 ISO Card (1)
ATA5567 Coin Cell (1)
ATA5570 Card w/ push button
Test Tag (1)

Sample ICs

U2270B (3) (Extra reader chips)
ATA5567 IC (3)
ATA5567 mico
-module (3)
– ATA5570(3)

CDROM

Source Code
Data Sheets
Application Notes
User Guide
Schematics and Gerber
files

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图3。 ATA2270-EK1主板外形图

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图4。 ATA2270-EK1阅读板外形图

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图5。系统框图

详情请见：

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