Atmel 公司的ATA5575M1 是低频(100 kHz 到150 kHz ) RFID无接触读写IC,单线圈连接到IC用作电源和双向通信接口.天线和芯片一起组成收发器或标签.片内的128b用户EEPROM能从基站中读和写,上行数据传输采用负载调制,下行是100%幅度调制(OOK)脉冲间隔编码比特流.典型应用频率为125kHz.本文介绍ATA5575M1主要特性, 方框图和RFID系统框图.
ATA5575M1: Read/Write LF RFID IDIC 100 kHz to 150 kHz The ATA5575 is a contactless read/write identification IC (IDIC?) for applications in the 100-kHz to 150-kHz 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 128-bit user EEPROM (16 bytes with 8 bits each) can be read and written byte-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 ATA5575 is an EEPROM-based circuit. It is optimized for maximum read range. Programming is also possible, but the write range is limited.
The chip has to be locked after loading the application-specific data into the device. Until the enable bits are set properly, the ATA5575M1 transmits all digits “0” in unique format. Typical applications run at 125 kHz.
ATA5575M1主要特性:
? Contactless Power Supply
? Contactless Read/Write Data Transmission
? Radio Frequency (RF) from 100 kHz to 150 kHz
? 128-bit EEPROM User Memory: 16 Bytes (8 Bits Each)
? 8-bit Configuration Memory
? High Q-antenna Tolerance Due to Built-in Options
? Standard Unique Format (Manchester, RF/64)
? 40-bitData Memory
? 14-bit Parity Memory
? 9-bit Header Memory
? On-chip Trimmed Antenna Capacitor
– 330 pF ±3%
– 250 pF ±3%
? Mega Pads 200 μm x 400 μm
? Mega Pads 200 μm x 400 μm with 25 μm Gold Bumps for Direct Coil Bonding
? Other Options:
Direct Access Mode
OTP Functionality
ATA5575M1应用:
– Access Control
图1.ATA5575M1方框图
图2.采用ATA5575M1标签的RFID系统框图
图3.采用ATA5575M1标签的RFID系统框图(2)
