ST M24LR64-R 13.56 MHz双接口EEPROM开发方案 接口, 开发, 智能

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关键词： eeprom , M24LR64-R , ST

ST公司的 M24LR64-R是无线存储器，具有口令保护的64Kb EEPROM以及400kHz I2C串行总线和13.56MHz ISO 15693 RF协议的 双接口的64Kb EEPROM，可实现智能手机的近场通信（NFC）。单电源1.8V-5.5V工作，64kb EEPROM分成I2C模式的8192B和RF模式的2048x32b，无接触接口和ISO 15693与ISO 18000-3 mode 1兼容，载波频率13.56 MHz ±7k Hz，广泛用于工业和消费类电子产品。本文介绍了M24LR64-R 主要特性，方框图，M24LR64-R单片和多组合参考设计以及双接口EEPROM开发套件主要特性。 The M24LR64-R device is a dual-interface, electrically erasable programmable memory(EEPROM). It features an I2C interface and can be operated from a VCC power supply. It is also a contactless memory powered by the received carrier electromagnetic wave. The M24LR64-R is organized as 8192 × 8 bits in the I2C mode and as 2048 × 32 bits in the ISO 15693 and ISO 18000-3 mode 1 RF mode.I2C uses a two-wire serial interface, comprising a bidirectional data line and a clock line. The devices carry a built-in 4-bit device type identifier code (1010) in accordance with the I2C bus definition. The device behaves as a slave in the I2C protocol, with all memory operations synchronized by the serial clock. Read and Write operations are initiated by a Start condition, generated by the bus master. The Start condition is followed by a device select code and Read/Write bit (RW), terminated by an acknowledge bit. When writing data to the memory, the device inserts an acknowledge bit during the 9th bit time, following the bus master’s 8-bit transmission. When data is read by the bus master, the bus master acknowledges the receipt of the data byte in the same way. Data transfers are terminated by a Stop condition after an Ack for Write, and after a NoAck for Read.In the ISO15693/ISO18000-3 mode 1 RF mode, the M24LR64-R is accessed via the 13.56 MHz carrier electromagnetic wave on which incoming data are demodulated from the received signal amplitude modulation (ASK: amplitude shift keying). The received ASK wave is 10% or 100% modulated with a data rate of 1.6 Kbit/s using the 1/256 pulse coding mode or a data rate of 26 Kbit/s using the 1/4 pulse coding mode. Outgoing data are generated by the M24LR64-R load variation using Manchester coding with one or two subcarrier frequencies at 423 kHz and 484 kHz. Data are transferred from the M24LR64-R at 6.6 Kbit/s in low data rate mode and 26 Kbit/s high data rate mode. The M24LR64-R supports the 53 Kbit/s in high data rate mode in one subcarrier frequency at 423 kHz. The M24LR64-R follows the ISO 15693 and ISO 18000-3 mode 1 recommendation for radio-frequency power and signal interface. M24LR64-R 主要特性： I2C interface ■ Two-wire I2C serial interface supports 400 kHz protocol ■ Single supply voltage: – 1.8 V to 5.5 V ■ Byte and Page Write (up to 4 bytes) ■ Random and Sequential Read modes ■ Self-timed programming cycle ■ Automatic address incrementing ■ Enhanced ESD/latch-up protection Contactless interface ■ ISO 15693 and ISO 18000-3 mode 1 compatible ■ 13.56 MHz ±7k Hz carrier frequency ■ To tag: 10% or 100% ASK modulation using 1/4 (26 Kbit/s) or 1/256 (1.6 Kbit/s) pulse position coding ■ From tag: load modulation using Manchester coding with 423 kHz and 484 kHz subcarriers in low (6.6 kbit/s) or high (26 kbit/s) data rate mode. Supports the 53 kbit/s data rate with Fast commands ■ Internal tuning capacitance: 27.5 pF ■ 64-bit unique identifier (UID) ■ Read Block & Write (32-bit Blocks) Memory ■ 64 Kbit EEPROM organized into: – 8192 bytes in I2C mode – 2048 blocks of 32 bits in RF mode ■ Write time – I2C: 5 ms (Max.) – RF: 5.75 ms including the internal Verify time ■ More than 1 Million write cycles ■ Multiple password protection in RF mode ■ Single password protection in I2C mode ■ More than 40-year data retention ■ Package – ECOPACK2® (RoHS compliant and Halogen-free) 图1。M24LR64-R方框图 M24LR64-R多组合参考设计 M24LR64-R Multi-bank reference design description and settings The M24LR64-R multi-bank reference design has been created to help users increase the memory density of their Dual Interface EEPROM, and has been designed in a way that will minimize the antenna size and the I²C interface footprint on the PCB. The basic principle is to connect several M24LR64-R devices in parallel on the same I²C bus (in compliance with I²C specifications) and for them to share one single antenna. This application note describes how the M24LR64-R Multi-Bank reference design works from the schematics and design perspective, and explains how to configure and use it. The ANT5-M24LR-A reference design consists of four M24LR64-R devices in parallel, resulting in 256 Kbits of equivalent user memory. The equivalent tuning capacitance value is 4 times that of a single M24LR64-R device. So the antenna, whether it is designed on a PCB or uses an SMD inductor, must be 4 times smaller than the one used for one single M24LR64-R device. 图2。ANT1-M24LR-A参考设计框图 图3。ANT5-M24LR-A参考设计框图 M24LR64-R双接口EEPROM开发套件 The DEVKIT-M24LR-A is a development kit for ST Dual Interface EEPROM products which allows system designers to evaluate the I2C and RF performance and capabilities of the M24LR64-R. RF applications can be developed using the ISO15693 13.56 MHz RF reader. 双接口EEPROM开发套件主要特性： ■ Middle-range RF reader (ISO 15693, RF 13.56 MHz) interfaced via the USB bus ■ External RF reader antenna ■ Serial EEPROM USB reader interfaced through the USB bus ■ ANT1-M24LR-A antenna reference board ■ I2C cable to connect the serial EEPROM USB reader to the ANT1-M24LR-A ■ External power supply ■ Installation CD-ROM including – Technical documentation – Installation software PC software 图4。M24LR64-R双接口EEPROM开发套件外形图 详情请见： CD00254727[1].pdf (1.59 MB, 下载次数: 1) 和 CD00280653[1].pdf (598.42 KB, 下载次数: 1)