以太网和CAN总线应用广泛，但由于其通信协议不同，两种总线器件间无法进行数据通信，因此，设计了基于CP2200与C8051F040的以太网总线与CAN总线接口转换电路，并给出部分相关硬件电路与软件设计分析。在保证数据完整和协议可靠的前提下，通过握手协议和简化的以太网协议，不仅实现了以太网数据与CAN数据的转发，同时还顺利的解决了以太网的高速性与CAN的低速率冲突，以及两者数据包之间的大小不同的矛盾。 Abstract: In the development of actual application， Ethernet and CAN bus are used very extensively. Owing to its various communication protocols， the communicating between two kinds of bus device can’t be carried out. Therefore， in order to solve this problem， the Ethernet-CAN bus interface circuit based on CP2200 and C8051F040 was designed in this paper， and part of the related hardware circuit and software design analysis were given. On the condition of data’s integrity and protocols’reliability， through the handshaking protocols and the simplified the Ethernet protocol， not only the data switching between CAN and Ethernet was realized， but also the differ in velocity and packet size was solved.
上传时间： 2013-10-14
上传用户：Ants
首先研究CAN总线和SAE J1939协议，提出一种基于MC9S12HZ256微控制器的总线式汽车数字仪表解决方案。详细介绍SAE J1939协议的报文帧格式及应用层协议中发动机相关参数的定义，以及步进电机及其驱动和车速信号的处理方法。该数字仪表系统硬件平台由微处理器和信号采集和信息处理及显示等模块组成。软件设计部分编程实现了对CAN总线和各传感器数据的读取、处理。该系统能够实时反映车辆工况。 Abstract: In this paper，CAN bus and SAE J1939protocol are researched，and a vehicle digital instrument solution based on MC9S12HZ256MCU is proposed.The message frame format and some engine-related parameters’definition in SAE J1939application layer protocol are introduced in detail.Stepper motor and its driver，the methods of speed signal process-ing are also introduced.The hardware platform of vehicle digital instrument is composed by MCU，signal acquisition mod-ule，and signal processing and displaying module.Data receiving and processing from CAN bus and sensors are accom-plished by programming，and vehicle condition can be reflected in real-time.
上传时间： 2013-10-19
上传用户：huannan88
针对当前安检力学试验机所能完成的试验种类单一、自动化程度低等问题，提出一种以ATmega128单片机为核心控制器的安检力学试验机的设计。详细阐述了该安检力学试验机各个组成部分的设计原理和方案，并且给出了各部分的软件设计思想和操作流程。经过大量测试试验表明：设计的安检力学试验机可以完成多达十余种的力学安检试验，完全符合相关国家标准，并且具有数据采集精度高、传输速度快、操作安全简便等特点，实现了安检设备的多功能化、数字化和自动化。 Abstract: Currently， many mechanical security testing machines have only one function. The degree of automation of them is low. To solve those problems， a new kind of mechanical security testing machine， using ATmega128 micro-controller as its core controller， has been advanced. It describes the components of the machine. The principles and the scheme in the designing processes are presented in detail， and the software architecture and the operation processes of each part are given. After having done many testing， we have reached the following conclusions: the mechanical security testing machine presented can do over ten mechanical security tests complying with related national standards. It has high data acquisition accuracy and high transmission speed. The operation of the machine is simple and safe. In general， this machine is a multi-functional， highly automatic， digitalized security testing device.
上传时间： 2013-11-05
上传用户：a67818601
dsPIC30F产品手册 High Performance Digital Signal Controllers This section of the manual contains the following topics:1.1 Introduction 1.2 Manual Objective 1.3 Device Structure1.4 Development Support 1.5 Style and Symbol Conventions 1.6 related Documents 1.7 Revision History
上传时间： 2013-12-26
上传用户：xzt
This document describes the system hardware implementation for the OMAP3530 processor and theTPS65930/20 companion power integrated circuit (IC). The document concentrates on the powerconnectivity for the processor and the companion power IC. The document also briefly explains someother specifics related to power, such as the boot modes and the power-up sequence.
上传时间： 2013-11-13
上传用户：yeling1919
The PCA82C250 and PCA82C251 are advanced transceiver products for use in automotive and general industrialapplications with transfer rates up to 1 Mbit/s. They support the differential bus signal representation beingdescribed in the international standard for in-vehicle CAN high-speed applications (ISO 11898). Controller AreaNetwork (CAN) is a serial bus protocol being primarily intended for transmission of control related data between anumber of bus nodes.
上传时间： 2013-11-24
上传用户：Alick
（Portmon is an application that lets you monitor serial and parallel activity on your local system, or any computer on the network that you can reach via TCP/IP. It is the most powerful tool available for tracking down port-related configuration problems and analyzing application port usage.）
上传时间： 2013-11-07
上传用户：1412904892
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. 图Figure 1. Local Safety System
上传时间： 2013-11-05
上传用户：维子哥哥
特点 精确度0.25%滿刻度 ±1位數 输入配线系统可任意选择 CT比可任意设定 具有异常电流值与异常次数记录保留功能 电流过高或过低检测可任意设定 报警继电器复归方式可任意設定 尺寸小,穩定性高 2.主要規格 辅助电源: AC110V&220V ±20%(50 or 60Hz) AC220V&440V ±20%(50 or 60Hz)(optional) 精确度: 0.25% F.S. ±1 digit 输入负载: <0.2VA (Current) 最大过载能力 : Current related input: 2 x rated continuous 10 x rated 30 sec. 25 x rated 3sec. 50 x rated 1 sec. 输入电流范围: AC0-5A (10-1000Hz) CT ratio : 1-2000 adjustable 启动延迟动作时间: 0-99.9 second adjustable 继电器延迟动作时间: 0-99.9 second adjustable 继电器复归方式: Manual (N) / latch(L) can be modified 继电器磁滞范围: 0-999 digit adjustable 继电器动作方向: HI /LO/GO/HL can be modified 继电器容量: AC 250V-5A, DC 30V-7A 过载显示: "doFL" 温度系数: 50ppm/℃ (0-50℃) 显示幕: Red high efficiency LEDs high 14.22mm(.56")(PV) Red high efficiency LEDs high 14.22mm(.276")(NO) 参数设定方式: Touch switches 记忆型式 : Non-volatile E2PROM memory 绝缘耐压能力: 2KVac/1 min. (input/output/power) 1600Vdc(input/output 使用环境条件 : 0-50℃(20 to 90% RH non-condensed) 存放环境条件: 0-70℃(20 to 90% RH non-condensed) CE认证: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上传时间： 2013-10-14
上传用户：wanghui2438
Abstract: Field-programmable gate arrays (FPGAs) are used in a wide variety of applications and end markets, including digital signalprocessing, medical imaging, and high-performance computing. This application note outlines the issues related to powering FPGAs.It also discusses Maxim's solutions for powering Xilinx® FPGAs.
上传时间： 2013-12-16
上传用户：haohaoxuexi
