Abstract: The number of uses for microelectromechanical systems (MEMS) is growing—they allow us todo jobs once considered impossible. This tutorial explains the applications for MEMS and the increasingneed to provide precision control and drivers for these DEVICES. Design and manufacturing considerationsare also discussed.
上傳時間： 2013-11-12
上傳用戶：paladin
多遠程二極管溫度傳感器-Design Considerations for pc thermal management Multiple RDTS (remote diode temperature sensing) provides the most accurate method of sensing an IC’s junction temperature. It overcomes thermal gradient and placement issues encountered when trying to place external sensors. PCB component count decreases when using a device that provides multiple inputs.Better temperature sensing improves product performance and reliability. Disk drive data integrity suffers at elevated temperatures. IBM published an article stating that a 5°C rise in operating temperature causes a 15% increase in the drive’s failure rate. The overall performance of a system can be improved by providing a more accurate temperature measurement of the most critical DEVICES allowing them to run just a few degrees hotter.The LM83 directly senses its own temperature and the temperature of three external PN junctions. One is dedicated to the CPU of choice, the other two go to other parts of your system that need thermal monitoring such as the disk drive or graphics chip. The SMBus-compatible LM83 supports SMBus timeout and logic levels. The LM83 has two interrupt outputs; one for user-programmable limits and WATCHDOG capability (INT), the other is a Critical Temperature Alarm output (T_CRIT_A) for system power supply shutdown.
標簽： Considerat Design 遠程 二極管
上傳時間： 2014-12-21
上傳用戶：ljd123456
Abstract: Communication with 1-Wire slave DEVICES requires a 1-Wire master. There are numerous ways to build a 1-Wire master (see reference design 4206, "Choosing the Right 1-Wire Master for Embedded Applications"). Thisdocument describes the DS1WM, a synthesizable 1-Wire master that can be implemented in an application-specificintegrated circuit (ASIC) or field-programmable gate array (FPGA).
上傳時間： 2014-12-22
上傳用戶：xanxuan
嵌入式系統是一種應用范圍非常廣泛的系統?？梢哉f除了桌面計算機和服務器外所有計算設備都屬于嵌入式系統，例如從便攜式音樂播放器到航天飛機上的實時系統控制都屬于嵌入式系統。 大多數商用的嵌入式系統都設計成專用任務的低成本的產品。大多數的嵌入式系統都具有實時性的要求。有些功能需要非常快的主頻，但其他大多數功能并不需要高速的處理能力。這些系統通過特定的器件和軟件來滿足實時性的要求。 簡單地通過速度和成本來定義嵌入式系統是困難的，但對于大批量的產品而言，成本常常對系統設計起決定作用。通常，一個嵌入式系統的很多部分相對系統主要功能來說需要較低的性能，因此嵌入式系統和通用PC相比，能夠使用一個滿足輔助功能的合適的CPU，從而簡化了系統設計，降低了成本。例如，數字電視的機頂盒需要處理每秒以百萬兆位計的連續數據，但這些數據處理大部分是由定制的硬件來實現的，如解析、管理和編解碼多個頻道的數字影像。 對于大批量生產的嵌入式系統，如便攜式音樂播放器或手機等，降低成本就成為最主要的問題。這些系統通常只具有幾個芯片：一個高度集成的CPU，一個定制的芯片用于控制其他所有的功能，還有一個存儲芯片。在這種設計中，每部分都設計成使用最小的系統功耗。 對于小批量的嵌入式應用，為了降低開發成本，常常使用PC體系結構，通過限制程序的執行時間或用一個實時操作系統來替換原先的操作系統。在這種情況下，可以使用一個或多個高性能的CPU來替換特殊用途的硬件。 嵌入式系統的軟件通常運行在有限的硬件資源上：沒有硬盤、操作系統、鍵盤或屏幕。軟件一般都沒有文件系統，如果有的話，也會采用Flash驅動器。如果有人機交互接口的話，也是一個小鍵盤或液晶顯示器。硬件是計算機的物理部分，和存儲在硬件中的計算機軟件程序和數據區分開來。 嵌入到機械中的嵌入式系統需要長期無故障連續運行，因此它的軟件需要比PC中的軟件更加仔細地開發和更加嚴格地測試。 那么，到底什么是嵌入式系統呢？ 根據IEEE（國際電氣和電子工程師協會）的定義，嵌入式系統是“控制、監視或者輔助設備、機器和車間運行的裝置”（原文為DEVICES used to control，monitor，or assist the operation of equipment，machinery or plants）。這主要是從應用上加以定義的，從中可以看出嵌入式系統是軟件和硬件的綜合體，還可以涵蓋機械等附屬裝置。 目前國內一個普遍被認同的定義是：以應用為中心、以計算機技術為基礎，軟件 硬件可裁剪，適應應用系統對功能、可靠性、成本、體積、功耗嚴格要求的專用計算機系統。 可以這樣認為，嵌入式系統是一種專用的計算機系統，作為裝置或設備的一部分。通常，嵌入式系統是一個控制程序存儲在ROM中的嵌入式處理器控制板。事實上，所有帶有數字接口的設備，如手表、微波爐、錄像機、汽車等，都使用嵌入式系統，有些嵌入式系統還包含操作系統，但大多數嵌入式系統都是由單個程序實現整個控制邏輯。 本書是按照人事部、信息產業部全國計算機技術與軟件專業技術資格（水平）考試要求編寫，內容緊扣《嵌入式系統設計考試大鋼》。全書共六章，分別對嵌入式系統基礎知識、嵌入式微處理器與接口設計、嵌入式軟件與操作系統、嵌入式軟件程序設計、嵌入式系統設計與維護等知識進行了詳細的講解。最后介紹了一個典型的嵌入式系統設計案例。 本書內容豐富，結構合理，概念清晰。既可作為全國計算機技術與軟件專業技術資格（水平）考試中嵌入式系統設計師級別的考試用書，供有關考生學習使用，也可作為本科生嵌入式系統相關課程教材或培訓書使用。
上傳時間： 2013-10-29
上傳用戶：dongqiangqiang
Abstract: The 1-Wire product family includes numerous DEVICES that can be easily evaluated using a Windows®-based
上傳時間： 2013-10-12
上傳用戶：fudong911
The C8051F020/1/2/3 DEVICES are fully integrated mixed-signal System-on-a-Chip MCUs with 64 digital I/O pins (C8051F020/2) or 32 digital I/O pins (C8051F021/3). Highlighted features are listed below; refer to Table 1.1 for specific product feature selection.
上傳時間： 2013-11-08
上傳用戶：lwq11
The NCV7356 is a physical layer device for a single wire data linkcapable of operating with various Carrier Sense Multiple Accesswith Collision Resolution (CSMA/CR) protocols such as the BoschController Area Network (CAN) version 2.0. This serial data linknetwork is intended for use in applications where high data rate is notrequired and a lower data rate can achieve cost reductions in both thephysical media components and in the microprocessor and/ordedicated logic DEVICES which use the network.The network shall be able to operate in either the normal data ratemode or a high-speed data download mode for assembly line andservice data transfer operations. The high-speed mode is onlyintended to be operational when the bus is attached to an off-boardservice node. This node shall provide temporary bus electrical loadswhich facilitate higher speed operation. Such temporary loads shouldbe removed when not performing download operations.The bit rate for normal communications is typically 33 kbit/s, forhigh-speed transmissions like described above a typical bit rate of83 kbit/s is recommended. The NCV7356 features undervoltagelockout, timeout for faulty blocked input signals, output blankingtime in case of bus ringing and a very low sleep mode current.
上傳時間： 2013-10-24
上傳用戶：s藍莓汁
The LPC2292/2294 microcontrollers are based on a 16/32-bit ARM7TDMI-S CPU with real-time emulation and embedded trace support, together with 256 kB of embedded high-speed flash memory. A 128-bit wide memory interface and a unique accelerator architecture enable 32-bit code execution at the maximum clock rate. For critical code size applications, the alternative 16-bit Thumb mode reduces code by more than 30 pct with minimal performance penalty. With their 144-pin package, low power consumption, various 32-bit timers, 8-channel 10-bit ADC, 2/4 (LPC2294) advanced CAN channels, PWM channels and up to nine external interrupt pins these microcontrollers are particularly suitable for automotive and industrial control applications as well as medical systems and fault-tolerant maintenance buses. The number of available fast GPIOs ranges from 76 (with external memory) through 112 (single-chip). With a wide range of additional serial communications interfaces, they are also suited for communication gateways and protocol converters as well as many other general-purpose applications. Remark: Throughout the data sheet, the term LPC2292/2294 will apply to DEVICES with and without the /00 or /01 suffix. The suffixes /00 and /01 will be used to differentiate from other DEVICES only when necessary.
上傳時間： 2014-12-30
上傳用戶：aysyzxzm
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
We offer a broad line of high performance low dropout (LDO) linear regulators with fasttransient response, excellent line and load regulation, and very wide input voltage rangefrom 0.9V to 100V. Output currents range from 20mA to 10A, with positive, negative andmultiple output versions available. Many DEVICES offer output voltage operation <0.8V andsome feature operation as low as 0V, even with a single supply. Most are stable with ceramicoutput capacitors. LDO regulators can be applied in virtually any application.
上傳時間： 2013-11-15
上傳用戶：努力努力再努力
