Automotive power systems are unforgiving electronicenvironments. Transients to 90V can occur when thenominal voltage range is 10V to 15V (ISO7637), along withbattery reversal in some cases. It’s fairly straightforwardto build automotive electronics around this system, butincreasingly end users want to operate portable electronics,such as GPS systems or music/video players,and to charge their Li-Ion batteries from the automotivebattery. To do so requires a compact, robust, effi cientand easy-to-design charging system
上傳時(shí)間： 2013-11-04
上傳用戶：wfl_yy
The LTC®4155 and LTC4156 are dual multiplexed-inputbattery chargers with PowerPath™ control, featuring I2Cprogrammability and USB On-The-Go for systems suchas tablet PCs and other high power density applications.The LTC4155’s float voltage (VFLOAT) range is optimizedfor Li-Ion batteries, while the LTC4156 is optimized forlithium iron phosphate (LiFePO4)batteries, supportingsystem loads to 4A with up to 3.5A of battery chargecurrent. I2C controls a broad range of functions and USBOn-The-Go functionality is controlled directly from theUSB connector ID pin.
標(biāo)簽： 高電流 便攜式產(chǎn)品 電池充電器 方案
上傳時(shí)間： 2013-10-09
上傳用戶：hanhanj
匯編器在微處理器的驗(yàn)證和應(yīng)用中舉足輕重，如何設(shè)計(jì)通用的匯編器一直是研究的熱點(diǎn)之一。本文提出了一種開放式的匯編器系統(tǒng)設(shè)計(jì)思想，在匯編語言與機(jī)器語言間插入中間代碼CMDL（code mapping description language）語言，打破匯編語言與機(jī)器語言的直接映射關(guān)系，由此建立起一套描述匯編語言與機(jī)器語言的開放式映射體系。基于此開放式映射體系開發(fā)了一套匯編器系統(tǒng)，具有較高層次上的通用性和可移植性。【關(guān)鍵詞】指令集，CMDL，匯編器，開放式 Design of Retargetable Assembler System Liu Ling Feng Wen Nan Wang Ying Chun Jiang An Ping Ji Li Jiu IME of Peking University, 100871【摘要】An assembler plays a very important role in the field of microprocessor verifications and applications, thus how to build a retargetable assembler system has been a hotspot in this field for long time. This paper presents a new method about the retargetable assembler system design.It provides a kind of language CMDL, code mapping description language. During the process of assembling, assembler languages are firstly translated to CMDL, and then mapped to the machine codes. In an other word, CMDL is inserted between assembler languages and machine codes during the translation procedure. As a medium code, CMDL has a lot of features, such as high extraction, strong descript capabilities. It can describe almost all attributes of assembler languages. By breaking the direct mapping relationship between assembler languages and machine codes, the complexities of machine codes are hided to the users, therefore, the new retargetable assembler system has higher retargetable level by converting the mapping from assembler languages and machine codes to assembler languages and CMDL, and implementationof it becomes easier. Based on the new mapping system structure, a retargetable assemblersystem is developed. It proved the whole system has good retargetability and implantability.【關(guān)鍵詞】instruction set, symbol table, assembler, lexical analysis, retargetability
上傳時(shí)間： 2013-10-10
上傳用戶：meiguiweishi
LTC1732 是LINEAR TECHNOLOGY 公司推出的鋰離子電池充電控制集成電路芯片。它具有電池插入檢測(cè)和自動(dòng)低壓電池充電功能。文章介紹了該芯片的結(jié)構(gòu)、特點(diǎn)、工作原理及應(yīng)用信息，給出了典型的應(yīng)用電路。 LTC1732 是LINEAR TECHNOLOGY 公司生產(chǎn)的鋰-離子（Li-離子）電池恒流/恒壓線性充電控制器。它也可以對(duì)鎳-鎘（NiCd）和鎳-氫（NiMH）電池恒流充電。其充電電流可通過外部傳感電阻器編程到7%（最大值）的精度。最終的浮動(dòng)電壓精度為1%。利用LTC1732 的SEL 端可為4.1V 或4.2V 電池充電。當(dāng)輸入電源撤消后，LTC1732 可自動(dòng)進(jìn)入低電流睡眠狀態(tài)，以使消耗電流下降到7μA。LTC1732 的內(nèi)部比較器用于檢測(cè)充電結(jié)束條件（C/10），而總的充電時(shí)間則是通過可編程計(jì)時(shí)器的外部電容來設(shè)置的。在電池完全放電后，控制器將自動(dòng)以規(guī)定電流的10%對(duì)被充電電池進(jìn)行慢速充電直到電池電壓超過2.457V。當(dāng)放電后的電池插入充電器或當(dāng)輸入電源接通時(shí)，LTC1732 將開始重新充電。另外，如果電池一直插入在充電器且在電池電壓降到3.8V（LTC1732-4）或4.05V（LTC1732-4.2）以下時(shí)，充電器也將開始重新充電。LTC1732 的其它主特點(diǎn)如下：●具有1%的預(yù)置充電電壓精度；●輸入電壓范圍4.5V～12V；●充電電流可編程控制；●具有C/10 充電電流檢測(cè)輸出；●可編程控制充電終端計(jì)時(shí)；●帶有低電壓電池自動(dòng)小電流充電模式；●可編程控制恒定電流接通模式；●具有電池插入檢測(cè)和自動(dòng)低壓電流充電功能；●帶有輸入電源（隔離適配器）檢測(cè)輸出；●LTC1732-4.2 型器件的再充電閾值電壓為4.05V；●LTC1732-4 型器件的再充電閾值電壓為3.8V。
上傳時(shí)間： 2013-11-12
上傳用戶：semi1981
作者RICHARD CHI-HSI LI，結(jié)合自己20年RF設(shè)計(jì)經(jīng)驗(yàn)，整理的RF設(shè)計(jì)技術(shù)與經(jīng)驗(yàn)，工程性很強(qiáng)，從最基本的LNA、MIXERS、差分對(duì)等講起，涉及到阻抗匹配，接地，天線設(shè)計(jì)，RF系統(tǒng)分析，是一本很不錯(cuò)的書。英文版
標(biāo)簽： RF設(shè)計(jì) 經(jīng)驗(yàn)
上傳時(shí)間： 2013-10-30
上傳用戶：ve3344
The NXP LPC315x combine an 180 MHz ARM926EJ-S CPU core, High-speed USB 2.0OTG, 192 KB SRAM, NAND flash controller, flexible external bus interface, an integratedaudio codec, Li-ion charger, Real-Time Clock (RTC), and a myriad of serial and parallelinterfaces in a single chip targeted at consumer, industrial, medical, and communicationmarkets. To optimize system power consumption, the LPC315x have multiple powerdomains and a very flexible Clock Generation Unit (CGU) that provides dynamic clockgating and scaling.The LPC315x is implemented as multi-chip module with two side-by-side dies, one fordigital fuctions and one for analog functions, which include a Power Supply Unit (PSU),audio codec, RTC, and Li-ion battery charger.
上傳時(shí)間： 2014-01-17
上傳用戶：Altman
Tiny C Compiler - C Scripting Everywhere - The Smallest ANSI C compiler Installation on a i386 Linux host (for Windows read win32/readme.txt) ./configure make make test make install By default, tcc is installed in /usr/local/bin. ./configure --help shows configuration options.
標(biāo)簽： Installation Everywhere Scripting Compiler
上傳時(shí)間： 2013-12-19
上傳用戶：zhangzhenyu
數(shù)字水印的嵌入和檢測(cè)，dct， 作者M(jìn)ao Li Purpose:an algorithm to achieve the embeding watermarking to a image by dct bloking and hvs,then detect the watermarking by comparability.
上傳時(shí)間： 2015-06-06
上傳用戶：hullow
Copyright Copyright © 2004 O Reilly Media, Inc. Printed in the United States of America. Published by O Reilly MediaInc., 1005 Gravenstein Highway North, Sebastopol, CA 95472. O Reilly & Associates books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (http://safari.oreilly.com). For more information, contact our corporate/institutional sales department: (800) 998-9938 or corporate@oreilly.com. Nutshell Handbook, the Nutshell Handbook logo, and the O Reilly logo are registered trademarks of O Reilly Media, Inc The Cookbook series designations, Java Servlet and JSP Cookbook, the image of a fennec fox, and related trade dress are trademarks of O Reilly & Associates, Inc. Java and all Java-based trademarks and logos are trademarks or registered trademarks of Sun Microsystems, Inc., in the United States
標(biāo)簽： Copyright America Printed Reilly
上傳時(shí)間： 2014-08-20
上傳用戶：lps11188
DES(Data Encrypton Standard) 算法的實(shí)現(xiàn)網(wǎng)上已經(jīng)有很多，本人在此講述的是在DES算法加密過程中如何查看16迭代過程中生成的Ki,Li,Ri,Fi,Si等，這樣可以當(dāng)做一個(gè)DES加密對(duì)照器，這樣可以方便的發(fā)現(xiàn)你在加密過程中出現(xiàn)的錯(cuò)誤!
標(biāo)簽： Encrypton Standard Data DES
上傳時(shí)間： 2015-06-22
上傳用戶：zhangliming420
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