This ink marks LTC’s eighth circuit collection publication.1We are continually surprised, to the point of near mystification, by these circuit amalgams seemingly limitlessappeal. Reader requests ascend rapidly upon publication,remaining high for years, even decades. All LTC circuitcollections, despite diverse content, share this popularity,although just why remains an open question. Why isit? Perhaps the form; compact, complete, succinct andinsular. Perhaps the freedom of selection without commitment,akin to window shopping.
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.
針對科研實驗中對拉壓千斤頂加載過程控制的需要，采用ATmega128單片機控制步進電機進而實現對執行系統的電動泵站實行自動控制。對力和位移的數據采集與處理及用步進電機控制電動泵站手柄的技術細節作了重點描述。通過單片機的A/D變換器對AMP放大模塊采集的電橋信號作量化處理，千斤頂的操控手柄位置依電動油泵閥門開啟的方向和大小作若干定位，單片機根據力或位移傳感器信號，實時控制步進電機驅動手柄旋轉到相應操控位置。
Abstract:
This article describes the use of ATmega128 AVR microcontroller series of DBS electric pumping stations and QF100/200 separate twoway hydraulic jack to automate the process of manipulating the work of the technical content. Articles on force and displacement data acquisition and processing， and stepper motor control electric pump with the handle of the key technical details were described. Through the MCU’s A / D converter module is collected on the AMP amplification quantify the signal bridge， jack handle position control valve opening according to the direction of electric pumps for a number of positioning and size of the microcontroller based on force or displacement sensor signals， real-time control stepper motor drive control handle rotate to the appropriate location.
基于幅移鍵控技術ASK（Amplitude-Shift Keying），以C8051F340單片機作為監測終端控制器，C8051F330D單片機作為探測節點控制器，采用半雙工的通信方式，通過監控終端和探測節點的無線收發電路，實現數據的雙向無線傳輸。收發電路采用直徑為0.8 mm的漆包線自行繞制成圓形空心線圈天線，天線直徑為（3.4±0.3）cm。試驗表明，探測節點與監測終端的通信距離為24 cm，通過橋接方式，節點收發功率為102 mW時，節點間的通信距離可達20 cm。與傳統無線收發模塊相比，該無線收發電路在受體積、功耗、成本限制的場合有廣闊的應用前景。
Abstract:
Based on ASK technology and with the C8051F340 and C8051F330D MCU as the controller， using half-duplex communication mode， this paper achieves bi-directional data transfer. Transceiver circuit constituted by enameled wire which diameter is 0.8mm and wound into a diameter （3.4±0.3） cm circular hollow coil antenna. Tests show that the communication distance between detection and monitoring of the terminal is 24cm，the distance is up to 20cm between two nodes when using the manner of bridging and the node transceiver power is 102mW. Compared with the conventional wireless transceiver modules， the circuit has wide application prospect in small size， low cost and low power consumption and other characteristics.
在需要實時大量輸入漢字的顯示控制處理應用中，利用傳統單片機實現顯示控制的設計方法是較難實現的。帶漢字字庫的液晶模塊的使用使得小容量ROM單片機的大量漢字信息輸入與顯示成為可能。提出了針對漢字字庫編碼的二級索引拼音輸入檢索方法,介紹了以ST7920作為控制器的帶漢字字庫的液晶顯示模塊的接口方法及漢字顯示和控制原理，給出了通用計算機鍵盤在單片機中的串行接口，采用該技術可大大增強單片機的漢字輸入功能。為小容量ROM單片機的大批量漢字信息處理提供了一種漢字輸入解決方案。
Abstract:
It is difficult to realize Chinese characters input method based on the embedded system by using the traditional design method of display control. It is possible to input and display Chinese characters based on the embedded system with the ROM of small content by using the LCD module with Chinese characters.Chinese characters input method of the quadric index recall in allusion to Chinese characters code is brought forward.The interface and the principle of Chinese characters display control based on the LCD module controlled with the ST7920 is introduced too.The serial interface of the computer keyboard in common use and the embedded system is given at the same time. It can enhance the embedded system function of Chinese characters input by using this technology, and provide a kind of Chinese characters input scheme for the embedded system with small capacity ROM.
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.
The Philips family of Multiplexers and Switches consists of bi-directional translating switches controlled via the I2C or SMBus to fan out an upstream SCL/SDA pair to 2, 4 or 8 downstream channels of SCx/SDx pairs. The Multiplexers allow only one downstream channel to be selected at a time, while the Switches allow any individual downstream channel or combination of downstream channels to be selected, depending on the content of the programmable control register. Once one or several channels have been selected, the device acts as a wire, allowing the master on the upstream channel to send commands to devices on all the active downstream channels, and devices on the active downstream channels to communicate with each other and the master. External pull-up resistors are used to pull each individual channel up to the desired voltage level. Combined interrupt output and hardware reset input are device options that are featured.
The PL2303 USB to Serial adapter is your smart and convenient accessory forconnecting RS-232 serial devices to your USB-equipped Windows host computer. Itprovides a bridge connection with a standard DB 9-pin male serial port connector inone end and a standard Type-A USB plug connector on the other end. You simplyattach the serial device onto the serial port of the cable and plug the USB connectorinto your PC USB port. It allows a simple and easy way of adding serial connectionsto your PC without having to go thru inserting a serial card and traditional portconfiguration.This USB to Serial adapter is ideal for connecting modems, cellular phones, PDAs,digital cameras, card readers and other serial devices to your computer. It providesserial connections up to 1Mbps of data transfer rate. And since USB does not requireany IRQ resource, more devices can be attached to the system without the previoushassles of device and resource conflicts.Finally, the PL-2303 USB to Serial adapter is a fully USB Specification compliantdevice and therefore supports advanced power management such as suspend andresume operations as well as remote wakeup. The PL-2303 USB Serial cable adapteris designed to work on all Windows operating systems.
摘 要 瞬態仿真領域的許多工作需要獲得可視化數據, 仿真電路不能將輸出參數繪制成圖形時研究工作將受到很大影響. 而權威電路仿真軟件PSpice 在這個方面不盡如人意. 本文提出了一種有效的解決辦法: 通過MATLAB 編程搭建一個PSpice 與MATLAB 的數據接口,使PSpice輸出數據文件可以導入到MATLAB中繪制圖形. 這令我們能夠很方便地獲得數據的規律以有效地分析仿真結果, 這項技術對于教學和工程實踐都有比較實際的幫助.關鍵詞: 瞬態仿真 仿真程序 PSpice MATLAB 可視化數據The Data Transfer from Pspice to MATLABWu hao Ning yuanzhong Liang yingAbstract Many works in the area of transient simulation has shown how a emulator such asPSpice can be interfaced to an control analysis package such as MATLAB to get viewdata. Thepaper describes how such interfaces can be made using the MATLAB programming. The platformas a typical platform will solve the problem that PSpice software sometimes can not draw the datato a picture. It can make us find the rule from numerous data very expediently, so we can analyzethe outcome of the simulation. And it also can be used in the field of education.Keywords Transient Simulation Emulator PSpice MATLAB Viewdata1 引言科學研究和工程應用常需要進行電路仿真 PSpice可進行直流 交流 瞬態等基本電路特性分析 也可進行蒙托卡諾 MC 統計分析 最壞情況 Wcase 分析 優化設計等復雜電路特性分析 它是國際上仿真電路的權威軟件 而MATLAB的主要特點有 高效方便的矩陣和數組運算 編程效率高 結構化面向對象 方便的繪圖功能 用戶使用方便 工具箱功能強大 兩者各有著重點 兩種軟件結合應用 對研究工作有很重要的意義香港理工大學Y. S. LEE 等人首先將PSpice和MATLAB結合 開發了電力電子電路優化用的CAD 程序MATSPICE[6] 將兩者相結合的關鍵在于 如何用MATLAB 獲取PSpice的仿真數據 對此參考文獻 6 里沒有詳細敘述 本文著重說明用MATLAB 讀取PSpice仿真數據的具體方法本論文利用MATLAB對PSpice仿真出的數據處理繪制出后者無法得到或是效果不好的仿真圖形 下面就兩者結合使用的例子 進行具體說明
