The LTM4601 DC/DC μModule regulator is a completehigh power Density stepdown regulator for up to 12Acontinuous (14A peak) loads. The device is housed ina small 15mm ¥ 15mm ¥ 2.8mm LGA surface mountpackage, thus the large power dissipation is a challengein some applications. This thermal application note willprovide guidelines for using the μModule regulator inambient environments with or without air fl ow. Loadcurrent derating curves are provided for several inputvoltages and output voltages versus ambient temperatureand air fl ow.
上傳時間: 2013-10-19
上傳用戶:bakdesec
The LTM4600 DC/DC μModule regulator is a complete highpower Density stepdown regulator for 10A continuous (14Apeak) loads. The device has two voltage options: 20VINmaximum for the LTM4600EV and 28VIN maximum for theLTM4600HVEV each housed in a small 15mm ¥ 15mm ¥2.8mm LGA surface mount package.
上傳時間: 2013-10-10
上傳用戶:adada
為滿足礦井安全生產要求,介紹了一種以AT89C51單片機為主控器,對環境空氣的溫度、有毒易燃氣體的濃度等進行檢測的監控系統。該系統配合外圍電路能實現對上述環境指標的控制并存儲相關數據與上位PC機通信。它采用硬件抗干擾和軟件抗干擾技術,以確保整個系統工作的準確性。 Abstract: In order to meet the needs of mine produce safety,a kind of intellignet mine ambient monotoring and control system based on AT89C51 is introduced.This system can detect the temperature of ambient of mine,the Density of poisonous inflammable gas,combined external circuit.With its function part, this system can change above-mentioned elements.
上傳時間: 2013-11-10
上傳用戶:wendy15
LLCR Pin Socket Testing with the Model 3732 High Density Matrix Card Computer processors (CPUs) today have come a long way from the computer processors of the past. They draw more power, run at lower voltages, and have more pins than ever before.
上傳時間: 2013-10-24
上傳用戶:whenfly
SPCE061A單片機硬件結構 從第一章中SPCE061A的結構圖可以看出SPCE061A的結構比較簡單,在芯片內部集成了ICE仿真電路接口、FLASH程序存儲器、SRAM數據存儲器、通用IO端口、定時器計數器、中斷控制、CPU時鐘、模-數轉換器AD、DAC輸出、通用異步串行輸入輸出接口、串行輸入輸出接口、低電壓監測低電壓復位等若干部分。各個部分之間存在著直接或間接的聯系,在本章中我們將詳細的介紹每個部分結構及應用。2.1 μ’nSP™的內核結構μ’nSP™的內核如0所示其結構。它由總線、算術邏輯運算單元、寄存器組、中斷系統及堆棧等部分組成,右邊文字為各部分簡要說明。算術邏輯運算單元ALUμ’nSP™的ALU在運算能力上很有特色,它不僅能做16位基本的算術邏輯運算,也能做帶移位操作的16位算術邏輯運算,同時還能做用于數字信號處理的16位×16位的乘法運算和內積運算。1. 16位算術邏輯運算不失一般性,μ’nSP™與大多數CPU類似,提供了基本的算術運算與邏輯操作指令,加、減、比較、取補、異或、或、與、測試、寫入、讀出等16位算術邏輯運算及數據傳送操作。2. 帶移位操作的16位算邏運算對圖2.1稍加留意,就會發現μ’nSP™的ALU前面串接有一個移位器SHIFTER,也就是說,操作數在經過ALU的算邏操作前可先進行移位處理,然后再經ALU完成算邏運算操作。移位包括:算術右移、邏輯左移、邏輯右移、循環左移以及循環右移。所以,μ’nSP™的指令系統里專有一組復合式的‘移位算邏操作’指令;此一條指令完成移位和算術邏輯操作兩項功能。程序設計者可利用這些復合式的指令,撰寫更精簡的程序代碼,進而增加程序代碼密集度 (Code Density)。在微控制器應用中,如何增加程序代碼密集度是非常重要的議題;提高程序代碼密集度意味著:減少程序代碼的大小,進而減少ROM或FLASH的需求,以此降低系統成本與增加執行效能。
上傳時間: 2013-10-10
上傳用戶:星仔
The AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 8Kbytes of Flash programmable and erasable read only memory (PEROM). The deviceis manufactured using Atmel’s high-Density nonvolatile memory technology and iscompatible with the industry-standard 80C51 and 80C52 instruction set and pinout.The on-chip Flash allows the program memory to be reprogrammed in-system or by aconventional nonvolatile memory programmer. By combining a versatile 8-bit CPUwith Flash on a monolithic chip, the Atmel AT89C52 is a powerful microcomputerwhich provides a highly-flexible and cost-effective solution to many embedded controlapplications.
上傳時間: 2013-11-10
上傳用戶:1427796291
HDB3(High Density Bipolar三階高密度雙極性)碼是在AMI碼的基礎上改進的一種雙極性歸零碼,它除具有AMI碼功率譜中無直流分量,可進行差錯自檢等優點外,還克服了AMI碼當信息中出現連“0”碼時定時提取困難的缺點,而且HDB3碼頻譜能量主要集中在基波頻率以下,占用頻帶較窄,是ITU-TG.703推薦的PCM基群、二次群和三次群的數字傳輸接口碼型,因此HDB3碼的編解碼就顯得極為重要了[1]。目前,HDB3碼主要由專用集成電路及相應匹配的外圍中小規模集成芯片來實現,但集成程度不高,特別是位同步提取非常復雜,不易實現。隨著可編程器件的發展,這一難題得到了很好地解決。
上傳時間: 2013-11-21
上傳用戶:sy_jiadeyi
Designing withProgrammable Logicin an Analog WorldProgrammable logic devicesrevolutionized digital design over 25years ago, promising designers a blankchip to design literally any functionand program it in the field. PLDs canbe low-logic Density devices that usenonvolatile sea-of-gates cells calledcomplex programmable logic devices(CPLDs) or they can be high-Densitydevices based on SRAM look-up tables
標簽: Solutions Analog Xilinx FPGAs
上傳時間: 2013-11-01
上傳用戶:a67818601
Designing withProgrammable Logicin an Analog WorldProgrammable logic devices revolutionizeddigital design over 25 years ago,promising designers a blank chip todesign literally any function and programit in the field. PLDs can be low-logicDensity devices that use nonvolatilesea-of-gates cells called complexprogrammable logic devices (CPLDs)or they can be high-Density devicesbased on SRAM look-up tables (LUTs)
標簽: Solutions Analog Altera FPGAs
上傳時間: 2013-11-08
上傳用戶:蟲蟲蟲蟲蟲蟲
在車載自組網中,路由協議很大程度上決定了整個網絡的性能。如何有效的利用車流信息提高傳輸質量是改善路由性能的一個關鍵問題。本文基于速度-密度線性模型,提出了一種實時車流密度的路由協議RVDR(Real-time Vehicle Density Routing)。該協議通過與鄰居節點交換的速度信息,對相關道路車流密度進行預測,并給出基于車流密度信息的路徑選擇方法。仿真結果表明,與現有協議相比,RVDR協議在實時性和高效性等性能方面得到改進。
上傳時間: 2014-07-10
上傳用戶:ZJX5201314