Information in this document is subject to change without notice and does notrepresent a commitment on the part of the manufacturer. The software describedin this document is furnished under license agreement or nondisclosureagreement and may be used or copied only in accordance with the terms of theagreement. It is against the law to copy the software on any medium except asspecifically allowed in the license or nondisclosure agreement. The purchasermay make one copy of the software for backup purposes. No part of this manualmay be reproduced or transmitted in any form or by any means, ElectroNIc ormechanical, including photocopying, recording, or information storage andretrieval systems, for any purpose other than for the purchaser’s personal use,without written permission.
上傳時間： 2014-12-27
上傳用戶：Tracey
The CAT823, CAT824, and CAT825 provide basic reset and monitoring functions for the ElectroNIc systems. Each device monitors the system voltage and maintains a reset output until that voltage reaches the device’s specified trip value and then maintains the reset output active condition until the device’s internal timer, after a minimum timer of 140ms; toallow the systems power supply to stabilize.
上傳時間： 2014-11-18
上傳用戶：BOBOniu
51單片機及其應用:1.1.1 電子計算機的問世及其經典結構1946年2月15日，第一臺電子數字計算機問世，這標志著計算機時代的到來。（CALCULATOR）ENIAC（“埃尼阿克”）◆ENIAC是電子管計算機，時鐘頻率僅有100 KHz，但能在1秒鐘的時間內完成5000次加法運算。◆與現代的計算機相比，有許多不足，但它的問世開創(chuàng)了計算機科學技術的新紀元，對人類的生產和生活方式產生了巨大的影響 。 匈牙利籍數學家馮·諾依曼在方案的設計上做出了重要的貢獻。1946年6月，他又提出了“程序存儲”和“二進制運算”的思想，進一步構建了計算機由運算器、控制器、存儲器、輸入設備和輸出設備組成這一計算機的經典結構。（EDVAC-ElectroNIc DISCRETE VARIABLE AUTOMATIC COMPUTER）二、微型計算機的應用形態(tài) 從應用形態(tài)上，微機可以分成三種：
標簽： 51單片機
上傳時間： 2013-12-20
上傳用戶：d815185728
The Controller Area Network (CAN) is a serial, asynchronous, multi-master communication protocol forconnecting ElectroNIc control modules, sensors and actuators in automotive and industrial applications.With the SJA1000, Philips Semiconductors provides a stand-alone CAN controller which is more than a simpleeplacement of the PCA82C200.Attractive features are implemented for a wide range of applications, supporting system optimization, diagnosisand maintenance.
標簽： Stand-alone contro 1000 SJA
上傳時間： 2013-11-18
上傳用戶：yxgi5
<Almost since the introduction of microcontrollers as ElectroNIc components there always has been an oscillatorcircuit on the device to make it work. From application point of view only some external components wererequired to make it work. However, to make sure that it will always work required more effort. This report is basedon feedback from the market from customers applying 8-bit mircrocontrollers.>
標簽： oscillators X-tal bit mic
上傳時間： 2013-11-12
上傳用戶：穿著衣服的大衛(wèi)
隨著當前電子技術及發(fā)動機電控技術的發(fā)展，以32位嵌入式微控制器及多任務實時操作系統(tǒng)為基本技術特征的新一代電子控制單元ECU(ElectroNIc Control Unit)的開發(fā)已成為汽車電子發(fā)展應用的主流。本文在Tonadofor OSEKWorks多任務實時操作系統(tǒng)及32佗Power PC微控制器MPC555的基礎上，介紹高壓共軌柴油發(fā)動機電子控制單元的最小系統(tǒng)設計方案。
上傳時間： 2013-10-30
上傳用戶：miaochun888
The C500 microcontroller family usually provides only one on-chip synchronous serialchannel (SSC). If a second SSC is required, an emulation of the missing interface mayhelp to avoid an external hardware solution with additional ElectroNIc components.The solution presented in this paper and in the attached source files emulates the mostimportant SSC functions by using optimized SW routines with a performance up to 25KBaud in Slave Mode with half duplex transmission and an overhead less than 60% atSAB C513 with 12 MHz. Due to the implementation in C this performance is not the limitof the chip. A pure implementation in assembler will result in a strong reduction of theCPU load and therefore increase the maximum speed of the interface. In addition,microcontrollers like the SAB C505 will speed up the interface by a factor of two becauseof an optimized architecture compared with the SAB C513.Moreover, this solution lays stress on using as few on-chip hardware resources aspossible. A more excessive consumption of those resources will result in a highermaximum speed of the emulated interface.Due to the restricted performance of an 8 bit microcontroller a pin compatible solution isprovided only; the internal register based programming interface is replaced by a set ofsubroutine calls.The attached source files also contain a test shell, which demonstrates how to exchangeinformation between an on-chip HW-SSC and the emulated SW-SSC via 5 external wiresin different operation modes. It is based on the SAB C513 (Siemens 8 bit microcontroller).A table with load measurements is presented to give an indication for the fraction of CPUperformance required by software for emulating the SSC.
標簽： synchronous Emulating serial
上傳時間： 2014-01-31
上傳用戶：z1191176801
基于FPGA數字電壓表的設計 EDA是電子設計自動化（ElectroNIc Design Automation）的縮寫，在20世紀60年代中期從計算機輔助設計（CAD）、計算機輔助制造（CAM）、計算機輔助測試（CAT）和計算機輔助工程（CAE）的概念發(fā)展而來的。 EDA技術就是以計算機為工具，設計者在EDA軟件平臺上，用硬件描述語言VHDL完成設計文件，然后由計算機自動地完成邏輯編譯、化簡、分割、綜合、優(yōu)化、布局、布線和仿真，直至對于特定目標芯片的適配編譯、邏輯映射和編程下載等工作。本電壓表的電路設計正是用VHDL語言完成的 。此次設計采用的是Altera公司 的Quartus II 7.0軟件。本次設計的參考電壓為2.5V，精度為0.01V。此電壓表的設計特點為通過軟件編程下載到硬件實現，設計周期短，開發(fā)效率高。
上傳時間： 2013-11-24
上傳用戶：無聊來刷下
This white paper discusses how market trends, the need for increased productivity, and new legislation have accelerated the use of safety systems in industrial machinery. This TÜV-qualified FPGA design methodology is changing the paradigms of safety designs and will greatly reduce development effort, system complexity, and time to market. This allows FPGA users to design their own customized safety controllers and provides a significant competitive advantage over traditional microcontroller or ASIC-based designs. Introduction The basic motivation of deploying functional safety systems is to ensure safe operation as well as safe behavior in cases of failure. Examples of functional safety systems include train brakes, proximity sensors for hazardous areas around machines such as fast-moving robots, and distributed control systems in process automation equipment such as those used in petrochemical plants. The International Electrotechnical Commission’s standard, IEC 61508: “Functional safety of electrical/ElectroNIc/programmable ElectroNIc safety-related systems,” is understood as the standard for designing safety systems for electrical, ElectroNIc, and programmable ElectroNIc (E/E/PE) equipment. This standard was developed in the mid-1980s and has been revised several times to cover the technical advances in various industries. In addition, derivative standards have been developed for specific markets and applications that prescribe the particular requirements on functional safety systems in these industry applications. Example applications include process automation (IEC 61511), machine automation (IEC 62061), transportation (railway EN 50128), medical (IEC 62304), automotive (ISO 26262), power generation, distribution, and transportation. 圖Figure 1. Local Safety System
標簽： FPGA 安全系統(tǒng)
上傳時間： 2013-11-05
上傳用戶：維子哥哥
Introduction to Xilinx Packaging ElectroNIc packages are interconnectable housings for semiconductor devices. The major functions of the ElectroNIc packages are to provide electrical interconnections between the IC and the board and to efficiently remove heat generated by the device. Feature sizes are constantly shrinking, resulting in increased number of transistors being packed into the device. Today's submicron technology is also enabling large-scale functional integration and system-on-a-chip solutions. In order to keep pace with these new advancements in silicon technologies, semiconductor packages have also evolved to provide improved device functionality and performance. Feature size at the device level is driving package feature sizes down to the design rules of the early transistors. To meet these demands, ElectroNIc packages must be flexible to address high pin counts, reduced pitch and form factor requirements. At the same time,packages must be reliable and cost effective.
上傳時間： 2013-10-22
上傳用戶：ztj182002
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