The PCA9557 is a silicon CMOS circuit which provides parallel input/output expansion for SMBus and I2C-bus applications. The PCA9557 consists of an 8-bit input port register, 8-bit output port register, and an I2C-bus/SMBus interface. It has low current consumption and a high-impedance open-drain output pin, IO0. The system master can enable the PCA9557’s I/O as either input or output by writing to the configuration register. The system master can also invert the PCA9557 inputs by writing to the active HIGH polarity inversion register. Finally, the system master can reset the PCA9557 in the event of a time-out by asserting a LOW in the reset input. The power-on reset puts the registers in their default state and initializes the I2C-bus/SMBus state machine. The RESET pin causes the same reset/initialization to occur without de-powering the part.
上傳時間： 2014-01-18
上傳用戶：bs2005
The ISO7220 and ISO7221 are dual-channel digital isolators. To facilitate PCB layout, the channels are orientedin the same direction in the ISO7220 and in opposite directions in the ISO7221. These devices have a logic inputand output buffer separated by TI’s silicon-dioxide (SiO2) isolation barrier, providing galvanic isolation of up to4000 V. Used in conjunction with isolated power supplies, these devices block high voltage, isolate grounds, andprevent noise currents on a data bus or other circuits from entering the local ground and interfering with ordamaging sensitive circuitry.
上傳時間： 2013-10-24
上傳用戶：hbsunhui
AVR Studio 幫助文件中文翻譯，網友翻譯的AVR Studio軟件里面的幫助文件。轉自“我們的AVR”網站，在此表示感謝。 圖元文件（metafile） 以.emf為擴展名的文件。是下面各種結構的基本組成部分，可以用來讓AVR LCD編輯器設計軟件模擬顯示器。它可以是一個段或者一個圖像。您不能直接用AVR LCD編輯器生成一個這樣的圖元文件。但是可以使用第三方軟件。Companion Software的Metafile Companion和Microsoft Visio 就是兩個讓用戶自己定義圖元文件的軟件。在市場上有好多更簡單，更便宜的轉換軟件支持gif，jpeg，bmp等的文件轉換成.emf文件。 (例如：www.harmware.com 網站上的Batch Thumb 、和www.irfanview.com網站上的IrfanView). 段（segment）這是軟件模擬顯示器的一部分。用LCD編輯器您可以分配所有的段對應到實際的LCD寄存器的位上。段被存成.emf文件。圖像（image）被用作背景圖像和外圍圖像的圖元文件。充當所有段的布景。這些對象是“靜態”的，不對任何LCD寄存器值有反映。圖像也被存成.emf文件。 模擬顯示器（display）多層的元文件和圖像的組合。它包含LCD 寄存器的分配信息。用XML格式保存成.dis文件。組（group）為了簡化設計，需要頻繁的保存使用段。組就是同一層中一些段（圖元文件）的集合。它的設計沒有實際的限制，但是不能包括靜態圖像（背景/前景）。最典型的組就是7段碼數字字型。組只是理論的設計工具，在最終的模擬顯示器文件中是沒有組存在的。組用擴展名為.pri 的文件保存。 對象（object）對包括以上各個元件的各種事物的稱謂的術語。模擬顯示器文件（display file）以.dis為擴展名的XML類型的文件。包含了所有的關于顯示器的信息。
上傳時間： 2013-10-31
上傳用戶：paladin
光盤內容1.1例 程 “例程”文件夾中為各章節的程序代碼，均在作者的目標板上（自行開發）調試通過，以確保程序正確。n Keil C對中文文件、目錄以及空格等可能無法編譯連接，所以若要正確調試，須確保所有文件、目錄為連續英文名或數字。n 這些程序應用到其他C8051Fxxx系列單片機時，要確保各個操作寄存器的名稱、地址與各個控制位相一致，否則需要修改。很多寄存器位的位置并不相同，所以移植程序時，使用者要參考F040寄存器和移植對象單片機的寄存器，以確保正確操作。1.2 原理圖及pcb封裝“原理圖及pcb封裝”文件夾里包含作者制作的C8051F040PCB封裝和原理圖引腳定義文件c8051f040.ddb。其中PCB封裝與Silicon Laboratories公司（原Cygnal公司）提供的TQ100封裝稍有不同（在cygnalpcb文件中）： 作者所做引腳長為2.5 mm，而cygnalpcb文件中的引腳長為1.3 mm。加長引腳焊盤是為了方便手工焊芯片。用戶可根據需要和習慣選擇封裝。
上傳時間： 2013-11-19
上傳用戶：
PK51是為8051系列單片機所設計的開發工具，支持所有8051系列衍生產品，，支持帶擴展存儲器和擴展指令集（例如Dallas390/5240/400,Philips 51MX,Analog Devices MicroConverters）的新設備,以及支持很多公司的一流的設備和IP內核,比如Analog Devices, Atmel, Cypress Semiconductor, Dallas Semiconductor, Goal, Hynix, Infineon, Intel, NXP(founded by Philips), OKI, Silicon Labs,SMSC, STMicroeleectronics,Synopsis, TDK, Temic, Texas Instruments,Winbond等。通過PK51專業級開發工具，可以輕松地了解8051的On-chip peripherals與及其它關鍵特性。
上傳時間： 2013-10-09
上傳用戶：1109003457
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
針對嵌入式機器視覺系統向獨立化、智能化發展的要求，介紹了一種嵌入式視覺系統--智能相機。基于對智能相機體系結構、組成模塊和圖像采集、傳輸和處理技術的分析，對國內外的幾款智能相機進行比較。綜合技術發展現狀，提出基于FPGA+DSP模式的硬件平臺，并提出智能相機的發展方向。分析結果表明，該系統設計可以實現脫離PC運行，完成圖像獲取與分析，并作出相應輸出。 Abstract: This paper introduced an embedded vision system-intelligent camera ，which was for embedded machine vision systems to an independent and intelligent development requirements. Intelligent camera architecture， component modules and image acquisition， transmission and processing technology were analyzed. After comparing integrated technology development of several intelligent cameras at home and abroad， the paper proposed the hardware platform based on FPGA+DSP models and made clear direction of development of intelligent cameras. On the analysis of the design， the results indicate that the system can run from the PC independently to complete the image acquisition and analysis and give a corresponding output.
上傳時間： 2013-10-24
上傳用戶：bvdragon
The field of microelectromechanical systems (MEMS), particularly micromachinedmechanical transducers, has been expanding over recent years, and the productioncosts of these devices continue to fall. Using materials, fabrication processes, anddesign tools originally developed for the microelectronic circuits industry, newtypes of microengineered device are evolving all the time—many offering numerousadvantages over their traditional counterparts. The electrical properties of siliconhave been well understood for many years, but it is the mechanical properties thathave been exploited in many examples of MEMS. This book may seem slightlyunusual in that it has four editors. However, since we all work together in this fieldwithin the School of Electronics and Computer Science at the University of Southampton,it seemed natural to work together on a project like this. MEMS are nowappearing as part of the syllabus for both undergraduate and postgraduate coursesat many universities, and we hope that this book will complement the teaching thatis taking place in this area.
上傳時間： 2013-10-16
上傳用戶：朗朗乾坤
Abstract: This reference design provides design ideas for a cost-effective, low-power liquid-level measurement dataacquisition system (DAS) using a compensated silicon pressure sensor and a high-precision delta-sigma ADC. Thisdocument discusses how to select the compensated silicon pressure sensor, suggest system algorithms, and providenoise analyses. It also describes calibration ideas to improve system performance while also reducing complexity andcost.
上傳時間： 2013-10-08
上傳用戶：sjy1991
Keil C51 V8 專業開發工具（PK51） PK51是為8051系列單片機所設計的開發工具，支持所有8051系列衍生產品，，支持帶擴展存儲器和擴展指令集（例如Dallas390/5240/400,Philips 51MX,Analog Devices MicroConverters）的新設備,以及支持很多公司的一流的設備和IP內核,比如Analog Devices, Atmel, Cypress Semiconductor, Dallas Semiconductor, Goal, Hynix, Infineon, Intel, NXP(founded by Philips), OKI, Silicon Labs,SMSC, STMicroeleectronics,Synopsis, TDK, Temic, Texas Instruments,Winbond等。 通過PK51專業級開發工具，可以輕松地了解8051的On-chip peripherals與及其它關鍵特性。 The PK51專業級開發工具包括… l μVision Ø 集成開發環境 Ø 調試器 Ø 軟件模擬器 l Keil 8051擴展編譯工具 Ø AX51宏匯編程序 Ø ANSI C編譯工具 Ø LX51 連接器 Ø OHX51 Object-HEX 轉換器 l Keil 8051編譯工具 Ø A51宏匯編程序 Ø C51 ANSI C編譯工具 Ø BL51 代碼庫連接器 Ø OHX51 Object-HEX 轉換器 Ø OC51 集合目標轉換器 l 目標調試器 Ø FlashMON51 目標監控器 Ø MON51目標監控器 Ø MON390 (Dallas 390)目標監控器 Ø MONADI (Analog Devices 812)目標監控器 Ø ISD51 在系統調試 l RTX51微實時內核 你應該考慮PK51開發工具包,如果你… l 需要用8051系列單片機來開發 l 需要開發 Dallas 390 或者 Philips 51MX代碼 l 需要用C編寫代碼 l 需要一個軟件模擬器或是沒有硬件仿真器 l 需要在單芯片上基于小實時內核創建復雜的應用
上傳時間： 2013-10-30
上傳用戶：yy_cn
