The use of optical FrEE-space emissions to provide indoor wireless commu- nications has been studied extensively since the pioneering work of Gfeller and Bapst in 1979 [1]. These studies have been invariably interdisciplinary in- volving such far flung areas such as optics design‚ indoor propagation studies‚ electronics design‚ communications systems design among others. The focus of this text is on the design of communications systems for indoor wireless optical channels. Signalling techniques developed for wired fibre optic net- works are seldom efficient since they do not consider the bandwidth restricted nature of the wireless optical channel.
标签： Communication Wireless Optical Systems
上传时间： 2020-06-01
上传用户：shancjb
Sound is simply an airborne version of vibration. The air which carries sound is a mixture of gases. In gases, the molecules contain so much energy that they break FrEE from their neighbors and rush around at high speed. As Figure 1.1(a) shows, the innumerable elastic collisions of these high-speed molecules produce pressure on the walls of any gas container. If left undisturbed in a container at a constant temperature, eventually the pressure throughout would be constant and uniform.
标签： Engineering Audio
上传时间： 2020-06-09
上传用户：shancjb
Computer science as an academic discipline began in the 1960’s. Emphasis was on programming languages, compilers, operating systems, and the mathematical theory that supported these areas. Courses in theoretical computer science covered finite automata, regular expressions, context-FrEE languages, and computability. In the 1970’s, the study of algorithms was added as an important component of theory. The emphasis was on making computers useful. Today, a fundamental change is taking place and the focus is more on a wealth of applications. There are many reasons for this change. The merging of computing and communications has played an important role. The enhanced ability to observe, collect, and store data in the natural sciences, in commerce, and in other fields calls for a change in our understanding of data and how to handle it in the modern setting. The emergence of the web and social networks as central aspects of daily life presents both opportunities and challenges for theory.
标签： Foundations Science Data of
上传时间： 2020-06-10
上传用户：shancjb
Xilinx FPGA Virtex-7 全系列（AD集成封装库），IntLib后缀文件，PCB封装带3D视图，拆分后文件为PcbLib+SchLib格式，Altium Designer原理图库+PCB封装库，集成封装型号列表：Library Component Count : 157Name Description----------------------------------------------------------------------------------------------------XC7V2000T-1FHG1761C Virtex-7 FPGA, 1200 User I/Os, 36 GTX, 1760-Ball BGA, Speed Grade 1, Commerical Grade, Pb-FrEEXC7V2000T-1FHG1761I Virtex-7 FPGA, 1200 User I/Os, 36 GTX, 1760-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FrEEXC7V2000T-1FLG1925C Virtex-7 FPGA, 1200 User I/Os, 16 GTX, 1924-Ball BGA, Speed Grade 1, Commercial Grade, Pb-FrEEXC7V2000T-1FLG1925I Virtex-7 FPGA, 1200 User I/Os, 16 GTX, 1924-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FrEEXC7V2000T-2FHG1761C Virtex-7 FPGA, 1200 User I/Os, 36 GTX, 1760-Ball BGA, Speed Grade 2, Commerical Grade, Pb-FrEEXC7V2000T-2FLG1925C Virtex-7 FPGA, 1200 User I/Os, 16 GTX, 1924-Ball BGA, Speed Grade 2, Commercial Grade, Pb-FrEEXC7V2000T-2GFHG1761EVirtex-7 FPGA, 1200 User I/Os, 36 GTX, 1760-Ball BGA, Speed Grade 2G, Extended Grade, Pb-FrEEXC7V2000T-2GFLG1925EVirtex-7 FPGA, 1200 User I/Os, 16 GTX, 1924-Ball BGA, Speed Grade 2G, Extended Grade, Pb-FrEEXC7V2000T-2LFHG1761EVirtex-7 FPGA, 1200 User I/Os, 36 GTX, 1760-Ball BGA, Speed Grade 2L, Extended Grade, Pb-FrEEXC7V2000T-2LFLG1925EVirtex-7 FPGA, 1200 User I/Os, 16 GTX, 1924-Ball BGA, Speed Grade 2L, Extended Grade, Pb-FrEEXC7V585T-1FFG1157C Virtex-7 FPGA, 850 User I/Os, 20 GTX, 1156-Ball BGA, Speed Grade 1, Commercial Grade, Pb-FrEEXC7V585T-1FFG1157I Virtex-7 FPGA, 850 User I/Os, 20 GTX, 1156-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FrEEXC7V585T-1FFG1761C Virtex-7 FPGA, 850 User I/Os, 36 GTX, 1760-Ball BGA, Speed Grade 1, Commercial Grade, Pb-FrEEXC7V585T-1FFG1761I Virtex-7 FPGA, 850 User I/Os, 36 GTX, 1760-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FrEEXC7V585T-2FFG1157C Virtex-7 FPGA, 850 User I/Os, 20 GTX, 1156-Ball BGA, Speed Grade 2, Commercial Grade, Pb-FrEEXC7V
上传时间： 2021-12-22
上传用户：aben
Xilinx FPGA Artix-7 全系列（AD集成封装库），IntLib后缀文件，PCB封装带3D视图，拆分后文件为PcbLib+SchLib格式，Altium Designer原理图库+PCB封装库，集成封装型号列表：Library Component Count : 48Name Description----------------------------------------------------------------------------------------------------XC7A100T-1CSG324C Artix-7 FPGA, 210 User I/Os, 0 GTP, 324-Ball BGA, Speed Grade 1, Commercial Grade, Pb-FrEEXC7A100T-1CSG324I Artix-7 FPGA, 210 User I/Os, 0 GTP, 324-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FrEEXC7A100T-1FGG484C Artix-7 FPGA, 285 User I/Os, 4 GTP, 484-Ball BGA, Speed Grade 1, Commercial Grade, Pb-FrEEXC7A100T-1FGG484I Artix-7 FPGA, 285 User I/Os, 4 GTP, 484-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FrEEXC7A100T-1FGG676C Artix-7 FPGA, 300 User I/Os, 8 GTP, 676-Ball BGA, Speed Grade 1, Commercial Grade, Pb-FrEEXC7A100T-1FGG676I Artix-7 FPGA, 300 User I/Os, 8 GTP, 676-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FrEEXC7A100T-1FTG256C Artix-7 FPGA, 170 User I/Os, 0 GTP, 256-Ball BGA, Speed Grade 1, Commercial Grade, Pb-FrEEXC7A100T-1FTG256I Artix-7 FPGA, 170 User I/Os, 0 GTP, 256-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FrEEXC7A100T-2CSG324C Artix-7 FPGA, 210 User I/Os, 0 GTP, 324-Ball BGA, Speed Grade 2, Commercial Grade, Pb-FrEEXC7A100T-2CSG324I Artix-7 FPGA, 210 User I/Os, 0 GTP, 324-Ball BGA, Speed Grade 2, Industrial Grade, Pb-FrEEXC7A100T-2FGG484C Artix-7 FPGA, 285 User I/Os, 4 GTP, 484-Ball BGA, Speed Grade 2, Commercial Grade, Pb-FrEEXC7A100T-2FGG484I Artix-7 FPGA, 285 User I/Os, 4 GTP, 484-Ball BGA, Speed Grade 2, Industrial Grade, Pb-FrEEXC7A100T-2FGG676C Artix-7 FPGA, 300 User I/Os, 8 GTP, 676-Ball BGA, Speed Grade 2, Commercial Grade, Pb-FrEEXC7A100T-2FGG676I Artix-7 FPGA, 300 User I/Os, 8 GTP, 676-Ball BGA, Speed Grade 2, Industrial Grade, Pb-FrEEXC7A100T-2FTG256C Artix-7 FPGA, 170 User I/Os, 0 GTP, 256-Ball BGA, Speed Grade 2, Commercial Grade, Pb-FrEEXC7A100T-2FTG256I Artix-7 FPGA, 170 User I/Os, 0 GTP, 2
上传时间： 2021-12-22
上传用户：
这是介绍蓝牙电话免提协议的最新文档,
上传时间： 2022-02-01
上传用户：
The PW2601 is a charger front-end integrated circuit designed to provide protection to Li-ionbatteries from failures of charging circuitry. The device monitors the input voltage, battery voltageand the charging current to make sure all three parameters are operated in normal range. Thedevice will switch off internal MOSFET to disconnect IN to OUT to protect load when any of inputvoltage, output current exceeds the threshold. The Over temperature protection (OTP) functionmonitors chip temperature to protect the device. The PW2601 also can protect the system’sbattery from being over charged by monitors the battery voltage continuously. The deviceoperates like a linear regulator, maintaining a 5.1V output with input voltages up to the input overvoltage threshold.The PW2601 is available in DFN-2x2-8L package. Standard products are Pb-FrEE and HalogenFrEE
标签： pw2601
上传时间： 2022-02-11
上传用户：
FrEEmodbus RTU在stm32上的移植分析最近用到FrEE modbus，需要在stm32上进行移植，以作modbus-RTU之用，现成协议的东西用起来很方便，现成源码很快就可以为设计者所用，也是当初制定标准的初衷吧。首先下载最新的modbus源码，所谓技术更新换代的比较快，用就用最新的东西，协议嘛也要下载最新的，下载最新的版本FrEEmodbus-v1.5，下载最新的协议不仅可以防止被人改动导致自己做无用功，保持原生态也可以很好的与制定者进行交流。解压FrEEmodbus-v1.5，目录结构很清晰，主要有四个文件件，分别是demo，modbus，tools，doc.其中tools为上位机测试modbus程序，doc为一些说明文件先不讨论。有用的是demo以及modbus.打开demo，没有看到stm32的工程文件，有一个叫BARE的文件夹，是一些不包括任何处理器的部分源代码，我们就用这个建立工程文件。为了给以后移植modbus-TCP带来方便，这里直接打开之前测试好的基于ENC28168的LwP的stm32工程，在其中导入各个文件。
标签： FrEEmodbus stm32
上传时间： 2022-06-20
上传用户：d1997wayne
PIC XC8 V1.41 PRO版，编译器破解文件，将附件文件覆盖编译器bin目录下原文件即可。你懂的。。。。。。。编译前把编译选项的FrEE改成PRO和谐文件在MPLAB X IDE v5.00版本测试成功清除已成功 (总时间： 10ms)make -f nbproject/Makefile-default.mk SUBPROJECTS= .build-confmake -f nbproject/Makefile-default.mk dist/default/production/KEY_V1.X.production.hexMicrochip MPLAB XC8 C Compiler (PRO Mode) V1.41Build date: Jan 24 2017Part Support Version: 1.41Copyright (C) 2017 Microchip Technology Inc.Memory Summary: Program space used 2A9h ( 681) of 1000h words ( 16.6%) Data space used 4Dh ( 77) of 100h bytes ( 30.1%) EEPROM space used 0h ( 0) of 100h bytes ( 0.0%) Data stack space used 0h ( 0) of AEh bytes ( 0.0%) Configuration bits used 2h ( 2) of 2h words (100.0%) ID Location space used 0h ( 0) of 4h bytes ( 0.0%)编译已成功 (总时间： 2s)正在加载代码...加载完成
标签： XC8
上传时间： 2022-06-21
上传用户：
1、安装完成后，点击Continue FrEE，进入下一步。2、如上图依次点击1-4，选择下图所示从TI官网下载的封装文件，导出所需软件的封装配置文件。注：这里导出的还只是配置文件，需再做一些操作才能生成Allegro的原件库文件。3、导出文件后，配置文件会自动尝试生成原件封装，但是肯定会失败。这时需要把自动打开的txt文件中如上所示的路径添加到Allegro中.4、双击上图自动生成的blank Board.Brd.如下图所示，依次把txt中的路径添加到Scriptpath，Padpath，psppath中。5、双击2019-05-22-17-33-23.bat，然后，一路确认下去。结束，下面箭头所指文件就是我们所要的元件封装了。当然，其他pad，Flash文件也要复制到相应的库路径里。
标签： allegro封装
上传时间： 2022-06-23
上传用户：xsr1983
