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)
