RC531读写器50欧姆匹配电路和天线设计资料

1：上电初始化主要做SPI接口确认步骤：1：给rc531的RSTPD脚一个高电平脉冲至少100us，热复位RC5312：读command-reg 直到寄存器数值为0，表示芯片上电初始化完成3：写0x80到page-reg，让芯片开始处理接口时序4：读command-reg 直到寄存器数值为0，表示芯片接口时序初始化完成5：此时可以写0x00到page-reg，指定寄存器地址模式为线性地址模式Note：见RC531第93页11.4 Initialising the Parallel Interface-Type说明2：spi接口时序使用SPIMODE0模式，在时钟的上升沿发送和读取数据读时序：主机连续写地址，写第二个地址时，在时钟上升沿可以读到RC531返回的第一个地址的值要求，地址字节的最高位为1，中间6位为实际地址，最低位为0写时序：第一个字节是地址，后面可以是N个数据，都往这个地址写，这点在写FIFO时很方便要求，地址字节的最高位为0，中间6位为实际地址，最低位为0NOTE：见RC531第17页通过写寄存器，一般两字节操作，addr+data和卡的数据交互，写数据到RC531的FIFO寄存器如（cs选中，addr写+data1+data2+...+dataN，cs释放）（cs选中，cmd-reg+0x1e（发送接收命令）+cs释放）（cs选中，addr读，读出n字节，cs释放）4：和卡的交互寻卡，使用命令0x52（对所有卡包括halt的卡有效），0x26（对standby的卡有效）数据长度1字节，返回2字节返回说明，2字节卡类型0x04= CARD_S50;0x44=UL卡0x08=CPU卡0x03= SHUL卡;NOTE：格式要求：RC531关闭所有校验，关闭加密，只发送7bit数据(通过更改531寄存器BitFraming)，见ISO144443A，7.2.3.2 WAKE-UP(REQA)指令防冲撞：先使用命令0x93，0x20返回5字节，4字节卡号+1字节异或效验例：531设置：无发送CRC，无接收CRC，有奇校验，ZeroAfer=1；发0x93，0x20;收0x88,0x4,0x4b,0x7,0xc0设置ZeroAfer=0；（必须有，否则之后操作不能完成）NOTE：格式要求：RC531关闭CRC，奇校验，通过设置DecodeControl接收控制ZeroAfer置1，选卡：先使用命令0x93，0x70 + 4字节卡号+ 卡号异或校验返回1字节SAK例：531设置：有发送CRC，接收CRC，有奇校验发0x93，0x70，0x88，0x4，0x4b，0x7，0xc0收0x04载入密码：验证：读卡：先使用命令0x30+block号（对UL卡而言是page号）返回16字节数据例：531设置：有发送CRC，有接收CRC，有奇校验发0x30，0x05收：0x4,0x4b,0x7,0xc0,0x99,0x2c,0x25,0x84,0x14,0x48,0x0,0x0,0x0,0x0,0x0,0x0NOTE：UL卡每扇区只有4字节，所以每次读出4扇区数据，共16字节数据对于普通mafare卡，每个扇区读写都要重新认证密钥写卡：第一步：先使用命令0xA0+block号（对UL卡而言是page号）确定写入地址有效返回1字节ACK（0x0a）例：531设置：有发送CRC，无接收CRC，有奇校验发0xA0，0x05收0x0a第二步：写入16字节块数据返回1字节ACK（0x0a）例：531设置：有发送CRC，无接收CRC，有奇校验发0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5收0x0aNOTE：按照14443A标准，返回的ACK是4bit数据，所以在使用FM2701等兼容芯片时，一定要取消接收CRC，否则接收不到ACK应答，另：在写UL卡之前，要先读一下0扇区，确定块锁定状态，否则不能写入。

竭诚为您提供优质文档/双击可除13.56mhz,协议篇一：13.56mhz--多功能射频卡读写器协议--hex1.串口uaRt通讯协议12345篇二：13.56mhz天线绘制13.56mhz读卡器天线pcb设计13.56mhz天线简介图1天线电路如图1所示，13.56mhz读卡器天线电路包括两大部分，其中黄色区域是信号接收电路；下面的蓝、绿、土黄色区域是信号发射电路。

下面分别介绍两部分电路。

发射电路：信号发射部分可细分为emc滤波电路、谐振与阻抗匹配电路、线圈三部分。

其中：emc滤波电路：主要是由lc低通滤波电路组成低通滤波器，读卡芯片经由tx1和tx2送出的天线信号主要是13.56mhz，但是不可避免也会有高次谐波存在。

所以该部分的低通滤波器主要作用就是滤除高于13.56mhz的无用信号。

这样即有利于读卡器与卡片之间的正常通信，也能减少天线部分对空间或者附近电路的电磁干扰。

匹配电路：匹配电路形式上图中土黄色区域，此部分主要是调整整个天线发射部分的谐振频率点到13.56mhz附近，这样可以使得线圈上的信号幅度增加有利于磁场辐射。

另外匹配电路还要将发射部分电路的电阻匹配到与读卡芯片的输出电阻附件，典型的是50欧姆（b不同芯片不一样）。

这样可以使得天线部分获得最大功率有利于读卡距离提升。

线圈：线圈可以是pcb线圈或者铜线绕制线圈。

接收电路：信号接收电路比较简单，由四个元器件构成，图中黄色区域cmin电容可稳定读卡芯片内部提供的固定参考电压Vmin，R1则将此参考电压引入到Rx引脚，为芯片的接收信号添加固定直流电平，cRx则从发生电路引入反馈信号与Vmin叠加后送入芯片内部。

通过调节R2和R1的比值可以调节Rx脚信号的幅度，使得芯片的读卡距离最佳。

硬件电路设计以图1中电路为例天线部分电路设计应该遵循以下原则：电路形式要做一些改进：在电感l0左侧串联0Ω电阻，将来断开电阻接入分析仪进行观察调试会比较方便，否则就只能把l0翘起来调试，这是比较麻烦的。

针对移动支付13.56MHz射频技术规范设计读卡器天线随着移动支付牌照的发放，各大运营商以及银行纷纷把下一个目标瞄准在移动支付领域。

移动支付领域的竞赛将趋于激烈化。

银联以及中国移动都先后制定了非接触IC卡支付终端的规范和标准。

本文以中国移动手机支付13.56MHz射频技术规范为例，应用NXP公司的射频芯片RC531设计出符合移动支付规范的读卡器天线及匹配电路。

1.天线外形设计天线做为一种能量变换器。

发射时，它把的高频电流转化为空间电磁波；接收时，它又把从空间截获的电磁波转换为高频电流。

对于设计一个小功率、短距离无线收发设备，天线设计是其中的重要部分。

良好的天线系统可以使通信距离和稳定性达到最佳状态。

中国移动手机支付13.56MHz射频技术规范中详细规定了读卡器天线的物理特性、功率传输与通信信号接口等技术要求。

规范中要求天线外圈尺寸为：80*60mm或55*40mm，并且天线与阻抗匹配网络臵于同一张PCB板上。

不仅如此，移动规范还规定了读卡器在规定的交易感应区域空间内的载波场强需保证在1.5A/m-7.5A/m以内。

场强测量区域如图1所示：图1由于移动规范所规定的场强测量半径非常大，已经接近了外圈天线尺寸，因此对于天线外形和绕圈方式应该谨慎处理：天线应采用两层或多层板走线；对于同一层电路板的线圈之间走线的距离应当尽量减小。

这样可以避免线圈总体宽度过大导致的外圈场强强度达不到规范所要求的1.5A/m-7.5A/m。

2.EMC电路设计NXP公司的射频芯片RC531使用的载波频率是13.56MHz，这个频率要用一个石英振荡器发生，但它同时也会产生高次谐波。

为了较好的抑制13.56MHz中的三次五次和高次谐波，我们使用如图2所示的低通滤波器：图2L0和C0是用于射频芯片RC531的输出信号TX1和TX2管脚的滤波，L0通常取值范围在0.56uH-2.2uH，根据截止频率在14MHz可以计算出C0的具体值。

RC531读写器50欧姆匹配电路和天线设计资料1.50欧姆匹配电路设计：50欧姆匹配电路主要起到将读写器的输出阻抗与天线的输入阻抗进行匹配，以提高系统的传输效率和信号质量。

以下是50欧姆匹配电路设计的要点：1.1选择合适的匹配元件：常用的匹配元件有电容、电感、变压器等，根据具体的设计需求选择合适的匹配元件。

电容一般用于匹配阻抗的实部，电感一般用于匹配阻抗的虚部。

1.2进行匹配电路的仿真分析：使用相关的仿真软件（如ADS或CST等），对设计的匹配电路进行仿真分析，通过调整匹配元件的数值和布局，优化匹配电路的性能，使得输入阻抗和输出阻抗达到50欧姆。

1.3考虑频率补偿：射频读写器的工作频率通常是在900MHz到2.45GHz范围内，由于工艺、环境等因素的影响，实际工作频率可能会有一定的偏差。

因此，在设计匹配电路时，需要考虑频率补偿，以适应不同频率下的匹配要求。

2.天线设计：2.1选择合适的天线类型和工作频率：常见的天线类型包括电磁振子天线、磁性环形天线等，根据具体的应用场景和读写器的工作频率，选择合适的天线类型和工作频率。

2.2设计天线的尺寸和布局：天线的尺寸和布局对于射频信号的辐射和接收起到重要的影响。

在设计过程中，需要考虑天线的辐射效率、方向性、增益等指标。

同时，根据实际应用需求，选择合适的天线形状和布局方式，如直线天线、环形天线、贴片天线等。

2.3考虑多路径效应：在实际应用中，射频信号可能会受到多径效应的干扰，即信号经过不同路径的传播而形成多个到达目标点的信号。

因此，在设计天线时，需要考虑多径效应对信号接收的影响，并采取相应的措施进行补偿和抑制。

以上是RC531读写器的50欧姆匹配电路和天线设计的要点。

在实际设计中，还需考虑系统的功耗、尺寸、成本等因素，综合考虑才能得出最优的设计方案。

HF的天线主要是靠耦合场来获取能量,因此天线电感的计算和测量就显得非常重要。

HF读卡器和标签通信的等效电路图如下:其中读卡器天线匹配比较方便一些，一般匹配成50欧姆,与同轴电缆匹配，即LCR谐振在50欧姆,可以通过网络分析仪或者阻抗分析仪来调,一般调节C1,使得C1调整后，频率为13.56M时谐振在50欧姆。

当然,读卡器端的等效电路可以为串联也可以为并联。

标签端的匹配会相对麻烦些，因为标签不可能配置成50欧姆,一般就是如图所示的电容并联的模型，通过调整电容来进行匹配。

一、电感的计算和测量目前有两种方式来测量电感.1、参考设计MFRC500的匹配电路和天线的应用指南－周立功。

pdf公式如下：其中，I1是个平均值2、参考TI—13.56M系统远距离天线设计的经典笔记.pdf公式如下:该公式主要是针对方形天线,感觉像是单圈天线。

其中Side是指方形天线的中心到中心的距离,以cm为单位；Diameter是指线宽，以cm为单位。

以50cmx50cm环形，1。

5cm宽的天线为例，计算如下：做个试验:单圈天线5cmX5cm，0。

15cm宽,用这个来做标签的天线，两个公式计算下来分别为81nH和136nH，因此仅用单圈天线做读卡器倒是可以，只要天线够大；但是对于标签来说未有点不切实际，需要多绕几圈。

而且对于一般标签来说,就是直接利用天线自身的寄生电容和寄生电感产生谐振,寄生电容一般很小，根据，L就需要比较大，因为单圈天线对于标签而言也不太合适.在实际使用当中，还需要借助LCR Meter等来进行测量,一般LCR Meter设置到1Khz进行测量。

另外还可以利用LCR parameters，HP4192A or Agilent Technologies 4294A进行准确测量。

二、电容的计算非常简单,根据公式可以直接计算出电容的值，这个电容值包含寄生电容和可调电容，一般寄生电容选择跟可调电容并联的方式。

三、Q值计算,f为谐振频率，R为负载电阻，L为回路电感，C为回路电容。

基于MF RC500的RFID读写器的天线及匹配电路设计摘要读写器的天线设计是影响射频识别系统工作距离的一个重要因素，基于MF RC500的读写器上的天线采用直接在PCB板上制作的微带天线；匹配电路的设计主要包括通过测试求出天线的等效电路、确定品质因子和阻抗匹配三个方面。

关键词射频识别读写器天线匹配电路1 引言射频识别（Radio Frequency Identification，简称RFID）技术是一门发展很快且有非常广泛应用前景的自动识别技术，整个系统包括读写器、标签和天线。

读写器主要完成对电子标签数据的读写，并根据需要将数据传输给上位机。

目前许多公司开发了针对不同协议和应用场合的读写器核心芯片，以实现读写器的快速开发。

MF RC500就是Philips公司生产的一款高集成度的读写器芯片，支持ISO/IEC14443（Type A）协议，工作频率为13.56MHz。

它内部的发送器部分不需要增加有源电路就能够直接驱动近操作距离的天线；接收部分提供一个坚固而有效的解调和解码电路，用于解调标签发送过来的调制信号，处理数据帧和进行错误检测（奇偶校验或者CRC校验）。

并行接口可直接连接到任何8位微处理器，这给读写器/终端的设计提供了极大的灵活性，因而得到了广泛应用。

本文主要介绍了基于MF RC 500的RFID读写器的天线及其匹配电路的设计方法，以使读写器达到最佳工作状态。

2 天线设计基于MF RC500的读写器主要由MF RC500、微处理器、天线以及相应的外围连接电路组成（如图1所示）。

读写器要通过天线来发射能量，形成电磁场，通图1 基于MF RC500读写器的结构框图· 56 · 测控与通信 2008年第1期 过电磁场来对电子标签进行识别，天线所形成的电磁场范围就是射频识别系统的可读写区域。

因此，要提高读写器的读写距离，所设计的天线必须能在尽可能大的范围内产生所需的电磁场。

由于MF RC500的工作频率f 是13.56MHz ，属于短波段，因此可以采用环形天线。

一、50ohm特征阻抗终端电阻的应用场合：时钟，数据，地址线的终端串联，差分数据线终端并联等。

终端电阻示图B.终端电阻的作用：1、阻抗匹配，匹配信号源和传输线之间的阻抗，极少反射，避免振荡。

2、减少噪声，降低辐射，防止过冲。

在串联应用情况下，串联的终端电阻和信号线的分布电容以及后级电路的输入电容组成RC滤波器，消弱信号边沿的陡峭程度，防止过冲。

C.终端电阻取决于电缆的特性阻抗。

D.如果使用0805封装、1/10W的贴片电阻,但要防止尖峰脉冲的大电流对电阻的影响，加30PF的电容.E.有高频电路经验的人都知道阻抗匹配的重要性。

在数字电路中时钟、信号的数据传送速度快时，更需注意配线、电缆上的阻抗匹配。

高频电路、图像电路一般都用同轴电缆进行信号的传送，使用特性阻抗为Zo＝150Ω、75Ω的同轴电缆。

同轴电缆的特性阻抗Zo，由电缆的内部导体和外部屏蔽内径D及绝缘体的导电率er决定：另外，处理分布常数电路时，用相当于单位长的电感L和静电容量C的比率也能计算，如忽略损耗电阻，则图1是用于测定同轴电缆RG58A/U、长度5m的输入阻抗ZIN时的电路构成。

这里研究随着终端电阻RT的值，传送线路的阻抗如何变化。

图1 同轴传送线路的终端电阻构成只有当同轴电缆的特性阻抗Zo和终端阻抗FT的值相等时，即ZIN＝Zo＝RT称为阻抗匹配。

Zo≠RT时随着频率f，ZIN变化。

作为一个极端的例子，当RT＝0、RT＝∞时可理解其性质(阻抗以，λ/4为周期起伏波动)。

图2是RT＝50Ω(稍微波动的曲线)、75Ω、dOΩ时的输人阻抗特性。

当Zo≠RT时由于随着频率，特性阻抗会变化，所以传送的电缆的频率特上产生弯曲.二、怎样理解阻抗匹配？阻抗匹配是指信号源或者传输线跟负载之间的一种合适的搭配方式。

阻抗匹配分为低频和高频两种情况讨论。

我们先从直流电压源驱动一个负载入手。

由于实际的电压源，总是有内阻的（请参看输出阻抗一问），我们可以把一个实际电压源，等效成一个理想的电压源跟一个电阻r串联的模型。

Short Form SpecificationFebruary 2002 Revision 2.0PhilipsSemiconductorsCONTENTS1INTRODUCTION (3)1.1Scope (3)1.2Features (3)1.3Applications (3)2BLOCK DIAGRAM (4)3MF RC531 PINNING (5)3.1Pinning Diagram (5)3.2Pin Description (6)3.2.1Antenna Interface (6)3.2.2Analog Supply (6)3.2.3Digital Supply (6)3.2.4Auxillary Pin (6)3.2.5Reset Pin (7)3.2.6Oscillator (7)3.2.7MIFARE® Interface (7)3.2.8Parallel Interface (7)3.2.9SPI Compatible Interface (8)3.3Applications (8)3.3.1Connecting Different µController's (8)3.3.2Application Example (9)4MIFARE® CLASSIC RELATED ITEMS (10)4.1CRYPTO I: Card Authentication (10)4.1.1Initiating Card Authentication (10)4.1.2Second Part of Card Authentication (10)5ELECTRICAL SPECIFICATION (11)5.1DC Characteristics (11)5.2Start up Characteristics (11)MIFARE® is a registered trademark of Philips Electronics N.V1 INTRODUCTION1.1 ScopeThe MF RC531 is member of a new family of highly integrated reader ICs for contactless communication at 13.56 MHz. This reader IC family utilises an outstanding modulation and demodulation concept completely integrated for all kinds of passive contactless communication methods and protocols at 13.56 MHz. The MFRC531 is pin- compatible to the MF RC500, the MF RC530 and the SL RC400.The MF RC531 supports all layers of theISO14443 including the type A and type B communication schemeThe MF RC531 supports contactless communication using MIFARE® Higher Baudrates. The internal transmitter part is able to drive an antenna designed for proximity operating distance (up to 100 mm) directly without additional active circuitry.The receiver part provides a robust and efficient implementation of a demodulation and decoding circuitry for signals from ISO14443 compatible transponders.The digital part handles the complete ISO14443 framing and error detection (Parity & CRC). Additionally it supports the fast MIFARE® Classic security algorithm to authenticate MIFARE®Classic (e.g. MIFARE® Standard, MIFARE® Light) products.A comfortable parallel interface, which can be directly connected to any 8-bit µ-Processor gives high flexibility for the reader/terminal design. Additionally a SPI compatible interface is supported.1.2 Features•Highly integrated analog circuitry todemodulate and decode card response•Buffered output drivers to connect an antenna with minimum number of external components •Proximity operating distance (up to 100 mm)•Supports ISO 14443•Supports MIFARE® Dual Interface Card ICs and supports MIFARE® Classic protocol•Supports contactless communication with higher baudrates up to 424kHz •Crypto1 and secure non-volatile internal key memory•Pin-compatible to the MF RC500, MF RC530 and the SL RC400•Parallel µ-Processor interface with internal address latch and IRQ line•SPI compatible interface•Flexible interrupt handling•Automatic detection of the used µ-Processor interface type•Comfortable 64 byte send and receive FIFO-buffer•Hard reset with low power function•Power down mode per software •Programmable timer•Unique serial number•Bit- and byte-oriented framing•Internal oscillator buffer to connect 13.56 MHz quartz, optimised for low phase jitter• 3.3 V to 5 V operation for transmitter (antenna driver) in short range and proximityapplications• 3.3 V or 5V operation for the digital part1.3 ApplicationsThe MF RC531 is tailored to fit the requirements of various applications using contactless communication based on ISO/IEC 14443 standard where cost-effectiveness, small size, high performance with a single voltage supply are important.•Public transport terminals•Handheld terminals•On board units•Contactless PC terminals•Metering•Contactless public phones2 BLOCK DIAGRAMThe block diagram shows the main internal parts of the MF RC531.The parallel µController interface automatically detects the kind of 8 bit parallel interface connected to it. It includes a comfortable bi-directional FIFO buffer and a configurable interrupt output. This gives the flexibility to connect a variety of µC, even low cost devices, still meeting the requirements of high speed contactless transactions.Additionally a SPI compatible interface will be supported. The MF RC531 acts as a slave during the SPI communication. The SPI clock SCK has to be generated by the master. The SPI interface includes a comfortable bi-directional FIFO buffer. The Data processing part performs parallel serial conversion of the data. It supports framing including CRC and parity generation / checking. It operates in full transparent mode thus supporting all layers of ISO 14443 A& B.The status and control part allows configuration of the device to adapt to environmental influences and to adjust to operate with best performance. For communication with MIFARE® Classic products like MIFARE® Standard or MIFARE®Light a high speed CRYPTO 1 stream cipher unit and a secure non-volatile key memory is implemented.The analog circuit includes a transmitting part with a very low impedance bridge driver output. This allows an operating distance up to 100mm. The receiver is able to detect and decode even very weak responses. Due to a highly sophisticated implementation the receiver is no longer a limiting factor for the operating distance.3 MF RC531 PINNING3.1 Pinning DiagramThe device is packaged in a 32 pin SO-package.The device operates with 3 individual power supplies for best performance in terms of EMC behaviour and signal de-coupling. This gives outstanding RF performance and also maximum flexibility to adapt to different operating voltages of digital and analog part.3.2 Pin Description3.2.1 ANTENNA INTERFACEThe contactless antenna interface basically uses four pins:Name Type FunctionTX1, TX2O Buffered Antenna DriversVMID Analog Reference VoltageRX I Analog Antenna Input SignalTo drive the antenna the MF RC531 provides the energy carrier of 13.56 MHz through TX1 and TX2. This signal is modulated by the transmitting data according the register settings.The card responds with load modulation of the RF field. The resulting signal picked up by the antenna is coupled out from the antenna matching circuit and forwarded to the RX-pin. Inside the MF RC531 the receiver senses and demodulates the signal and processes it according to the register settings. Data is passed further on to the parallel interface where it is accessible by the µ-Controller.The MF RC531 uses a separate power supply for the driver stage.Name Type FunctionTVDD Power Transmitter Supply Voltage TGND Power Transmitter Supply Ground3.2.2 ANALOG SUPPLYFor best performance the MF RC531 analog part has a separate supply. It powers the oscillator, the analog demodulator and decoder circuitry.Name Type FunctionAVDD Power Analog Positive Supply Voltage AGND Power Analog Supply Ground3.2.3 DIGITAL SUPPLYThe MF RC531 uses a separate digital supply.Name Type FunctionDVDD Power Digital Positive Supply Voltage DGND Power Digital Supply Ground3.2.4 AUXILLARY PINInternal signals may be selected to drive this pin. It is used for design-in support and test purpose.3.2.5 RESET PINThe reset pin disables internal current sources and clocks and detaches the MF RC531 virtually from the µC bus. If RST is released, the MF RC531 executes the power up sequence.3.2.6 OSCILLATORName Type FunctionXIN I Oscillator Buffer InputXOUT O Oscillator Buffer OutputThe very fast on-chip oscillator buffer operates with a 13.56 MHz crystal connected to XIN and XOUT. If the device shall operate with an external clock it may be applied to pin XIN.3.2.7 MIFARE® INTERFACEThe MF RC531 supports the active antenna concept of MIFARE®. It may handles the base-band signals NPAUSE and KOMP of MIFARE® Core Modules (MF CMxxx) at the pins MFIN and MFOUT.Name Type FunctionMFIN I with Schmitt Trigger MIFARE® Interface InputMFOUT O MIFARE® Interface OutputThe MIFARE® interface may be used to communicate with either the analog or the digital part of the MFRC531 separately in the following ways:•The analog circuit may be used stand-alone via the MIFARE® interface. In that case MFIN will be connected to the externally generated NPAUSE signal. The MFOUT pin provides the KOMP signal.•The digital circuit may be used to drive an external analog circuit via the MIFARE® interface. In that case the MFOUT pin provides the internally generated NPAUSE signal and MFIN will be connected to the KOMP signal from the outside.3.2.8 PARALLEL INTERFACE16 pins control the parallel interface:Name Type FunctionD0 … D7I/O with Schmitt Trigger Bi-directional Data BusA0 … A2I/O with Schmitt Trigger Address LinesNWR / RNW I/O with Schmitt Trigger Not Write / Read Not WriteNRD / NDS I/O with Schmitt Trigger Not Read / Not Data StrobeNCS I/O with Schmitt Trigger Not Chip SelectALE I/O with Schmitt Trigger Address Latch EnableIRQ O Interrupt Request3.2.9 SPI COMPATIBLE INTERFACE4 pins control the SPI compatible interface.Name Type FunctionA0I/O with Schmitt Trigger MOSI, master to slavecommunicationA2I/O with Schmitt Trigger SCK, clock to be generated by themasterD0I/O with Schmitt Trigger MISO, slave to mastercommunicationALE I/O with Schmitt Trigger NSS, enables the SPIcommunication3.3 Applications3.3.1 CONNECTING DIFFERENT µCONTROLLER'SThe MF RC531 supports different parallel µC interfaces and a SPI compatible interface. An intelligent auto-detection logic automatically adapts the parallel interface to the respective bus system. Selection of the device is performed with signal NCS.To connect µ-Controllers using separated address and data bus pin ALE has to be connected to DVDD.To connect µ-Controllers using multiplexed address and data bus pin ALE has to be connected to the signal ALE of the µ-ControllerTo connect µ-Controllers using RNW and NDS (instead of NWR and NRD) the µ-Controller’s RNW has to be connected to pin NWR and NDS to pin NRD.3.3.2 APPLICATION EXAMPLE4 MIFARE® CLASSIC RELATED ITEMS4.1 CRYPTO I: Card AuthenticationFor correct authentication of MIFARE® Classic products the fast CRYPTO 1 stream cipher is available. The corresponding keys have to be programmed into the secure non-volatile key memory of the MF RC531.Only two commands need to be sent by application software to turn on CRYPTO 1 secured communication.4.1.1 INITIATING CARD AUTHENTICATION The correct key for the authentication has to be selected from the secure internal non-volatile key memory and loaded into the internal CRYPTO1 register. Next the authentication command is transmitted to the card.After receiving the first message token from the card, the µ-Controller has to check the communication status flags. If communication so far has been successful the second part of the authentication procedure can be started.4.1.2 SECOND PART OF CARD AUTHENTICATIONData to be transmitted to the card in this phase are generated automatically by the internal CRYPTO 1 unit inside the MF RC531. To request this action the according command has to be triggered.The card will respond with the second message token. Then the communication status flags have to be checked by the µ-Controller. If authentication has been successful further communication with a MIFARE® Classic card continues CRYPTO 1 enciphered.Philips Semiconductors Short From Specification Rev. 2.0 February 2002ISO 14443 Reader IC MF RC53111PUBLIC5 ELECTRICAL SPECIFICATION 5.1 DC Characteristics SYMBOL PARAMETERCONDITIONSMINTYPMAXUNITVoltage Supply 4.5 5.0 5.5VDVDD Digital Supply Voltage 3.0 3.3 3.6AVDD Analog Supply Voltage 4.5 5.0 5.5V TVDDTransmitter Supply Voltage3.35.05.5V Current Consumption I DVDD Operating Digital Supply Current Idle Command6mA I AVDD Operating Analog Supply Current Idle Command,Receiver On 25mA I TVDDOperating Buffered Antenna Driver Supply Currentcontinuous wave50mA5.2 Start up Characteristics ModeCONDITIONSCurrent UNITTimeUNITStartup times and current consumption Power on--< 1000µs Hard Reset via Reset Pin 1µA < 1000µs Soft Reset via Register Setting1µA < 1000µsDefinitionsData sheet statusObjective specification This data sheet contains target or goal specifications for product development. Preliminary specification This data sheet contains preliminary data; supplementary data may bepublished later.Product specification This data sheet contains final product specifications.Limiting valuesLimiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics section of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability.Application informationWhere application information is given, it is advisory and does not form part of the specification.Life support applicationsThese products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so on their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale.Philips Semiconductors - a worldwide company Argentina: see South America Netherlands: Postbus 90050, 5600 PB EINDHOVEN, Bldg. VB, Australia: 34 Waterloo Road, NORTHRYDE, NSW 2113,Tel. +3140 27 82785, Fax +3140 27 88399Tel. +612 9805 4455, Fax. +612 9805 4466New Zealand: 2 Wagener Place, C.P.O. 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Pasica 5/v, 11000 BEOGRAD,Tel. +38111 625 344, Fax. +38111 635 777Published by:Philips Semiconductors Gratkorn GmbH, Mikron-Weg 1, A-8101 Gratkorn, Austria Fax: +43 3124 299 - 270 For all other countries apply to: Philips Semiconductors, Marketing & Sales Communications, Internet: Building BE-p, P.O.Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax: +3140 27 24825© Philips Electronics N.V. 1997 SCB52 All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without any notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.PhilipsSemiconductors。

基于MF RC500的RFID读写器的天线及匹配电路设计唐海琳;邹逢兴
【期刊名称】《兵工自动化》
【年(卷),期】2007(26)11
【摘要】基于MF RC500的读写器的天线采用直接在PCB板上制作的微带天线,需要设计天线线圈,使其符合电磁传播规律.该电路要求使用无源的功率匹配网络将天线阻抗转为50Ω,然后由同轴电缆无辐射无损失的将功率从读写器传送给天线.匹配电路设计首先需测出天线的等效电路,再计算出天线的品质因子,然后得出匹配电路的电容值.
【总页数】2页(P63-64)
【作者】唐海琳;邹逢兴
【作者单位】国防科技大学,机电工程与自动化学院,湖南,长沙,410073;国防科技大学,机电工程与自动化学院,湖南,长沙,410073
【正文语种】中文
【中图分类】TN98
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