In a recent discussion with a system designer, the requirementfor his power supply was to regulate 1.5Vand deliver up to 40A of current to a load that consistedof four FPGAs. This is up to 60W of power that must bedelivered in a small area with the lowest height profi lepossible to allow a steady fl ow of air for cooling. Thepower supply had to be surface mountable and operateat high enough effi ciency to minimize heat dissipation.He also demanded the simplest possible solution so histime could be dedicated to the more complex tasks. Asidefrom precise electrical performance, this solution had toremovethe heat generated during DC to DC conversionquickly so that the circuit and the ICs in the vicinity do notoverheat. Such a solution requires an innovative designto meet these criteria:
上传时间： 2013-11-24
上传用户：defghi010
As logic systems get larger and more complex, theirsupply current requirements continue to rise. Systemsrequiring 100A are fairly common. A high current powersupply to meet such requirements usually requires parallelingseveral power regulators to alleviate the thermalstress on the individual power components. A powersupply designer is left with the choice of how to drive theseparalleled regulators: brute-force single-phase or smartPolyPhaseTM.
上传时间： 2013-10-08
上传用户：zhqzal1014
When a system designer specifies a nonisolated dc/dc powermodule, considering the needed input voltage range isequally as important as considering the required performanceattributes and features. Generally, nonisolated moduleshave either a narrow or a wide input voltage range. Narrowinputmodules typically have a nominal input voltage of3.3, 5, or 12 V. For systems that operate from a tightlyregulated input bus—such as those that do not use batterybackup—a narrow-input module is often adequate sincethe input remains fairly stable.Offering greater flexibility, wide-input modules operatewithin a range of 7 to 36 V, which includes the popular12- or 24-V industrial bus. This enables a single module tobe used for generating multiple voltages. These modulesare ideal for industrial controls, HVAC systems, vehicles,medical instrumentation, and other applications that usea loosely regulated distribution bus. In addition, systemspowered by a rectifier/battery charger with lead-acidbattery backup almost always require wide-input modules.System designers who choose power supplies may wantto take a close look at the latest generation of wide-inputdc/dc modules.
标签： Wide-input modules offer dc
上传时间： 2014-12-24
上传用户：dragonhaixm
The MAX9257/MAX9258 programmable serializer/deserializer (SerDes) devices transfer both video data and control signals over the same twisted-pair cable. However, control data can only be transmitted during the vertical blank time, which is indicated by the control-channel-enabled output (CCEN) signal. The electronic control unit (ECU) firmware designer needs to know how quickly to respond to the CCEN signal before it times out and how to calculate this duration. This application note describes how to calculate the duration of the CCEN for the MAX9257/MAX9258 SerDes chipset. The calculation is based on STO timeout, clock frequency, and UART bit timing. The CCEN duration is programmable and can be closed if not in use.
上传时间： 2014-01-24
上传用户：xingisme
The PCA9516 is a BiCMOS integrated circuit intended forapplication in I2C and SMBus systems.While retaining all the operating modes and features of the I2Csystem, it permits extension of the I2C-bus by buffering both the data(SDA) and the clock (SCL) lines, thus enabling five buses of 400 pF.The I2C-bus capacitance limit of 400 pF restricts the number ofdevices and bus length. Using the PCA9516 enables the systemdesigner to divide the bus into five segments off of a hub where anysegment to segment transition sees only one repeater delay.
上传时间： 2013-11-21
上传用户：q123321
The PCA9517 is a CMOS integrated circuit that provides level shifting between lowvoltage (down to 0.9 V) and higher voltage (2.7 V to 5.5 V) I2C-bus or SMBus applications.While retaining all the operating modes and features of the I2C-bus system during thelevel shifts, it also permits extension of the I2C-bus by providing bidirectional buffering forboth the data (SDA) and the clock (SCL) lines, thus enabling two buses of 400 pF. Usingthe PCA9517 enables the system designer to isolate two halves of a bus for both voltageand capacitance. The SDA and SCL pins are over voltage tolerant and arehigh-impedance when the PCA9517 is unpowered.
标签： translating Level 9517 PCA
上传时间： 2013-12-25
上传用户：wsf950131
altium designer实例教程
上传时间： 2013-11-17
上传用户：zhaiye
简单实用
上传时间： 2013-10-11
上传用户：吾学吾舞
友善之臂的QtEmbedded实例教程 第一章 LINUX 图形用户界面 GUI 介绍.....................................................................................1 1.1 常用 GUI 介绍...................................................................................................................1 1.2 关于 Qt...............................................................................................................................2 1.3 Qt/Embedded 简介.............................................................................................................4 1.4 Qtopia 介绍.........................................................................................................................4 第二章 QT的安装..........................................................................................................................6 2.1 Qt X11 的安装....................................................................................................................6 2.2 Qt/Embedded 安装..............................................................................................................9 2.3 Qtopia 编译.......................................................................................................................11 第三章 QT的编程........................................................................................................................12 实验一 “Hello word！ ”Qt初探............................................................................................12 实验二 创建一个窗口并添加按钮.......................................................................................17 实验三 对象间通信：Signal 和 Slot 机制........................................................................20 实验四 菜单和快捷键...........................................................................................................29 实验五 工具条和状态栏.......................................................................................................38 实验六 鼠标和键盘事件.......................................................................................................48 实验七 对话框.......................................................................................................................63 实验八 Qt 中的绘图..............................................................................................................75 实验九 Qt 中的多线程编程..................................................................................................85 实验十 Qt 中的网络编程......................................................................................................97 第四章 QT常用工具的介绍...................................................................................................... 111 4.1 Qt 设计器（Qt Designer）............................................................................................ 111 4.2 Tmake..............................................................................................................................113 4.3 Qvfb ................................................................................................................................114
标签： QtEmbedded 教程
上传时间： 2013-12-21
上传用户：laozhanshi111
随着FPGA技术的发展，FPGA设计已不再只是硬件电路的设计，而是包含处理器、外围组件和接口逻辑在内的完整数字系统，同时在处理器中编程完成嵌入式代码的FPGA“软”设计。与传统的主要基于硬件描述语言进行FPGA设计开发不同，本文在电路设计软件Altium Designer开发环境下，结合Xilinx公司的ISE设计软件，在Altium Designer的创新电子设计平台NanoBoard 3000上，设计实现了基于Altium Designer特有的系统级设计方法OpenBus系统的32位处理器控制LED的FPGA嵌入式设计。
上传时间： 2013-11-09
上传用户：亚亚娟娟123
