I2C(Inter Integrated Circuits)是Philips公司開發(fā)的用于芯片之間連接的串行總線，以其嚴格的規(guī)范、卓越的性能、簡便的操作和眾多帶I2C接口的外圍器件而得到廣泛的應用并受到普遍的歡迎。 現(xiàn)場可編程門陣列(FPGA)設計靈活、速度快，在數(shù)字專用集成電路的設計中得到了廣泛的應用。本論文主要討論了如何利用Verilog/FPGA來實現(xiàn)一個隨機讀/寫的I2C接口電路，實現(xiàn)與外圍I2C接口器件E2PROM進行數(shù)據(jù)通信，實現(xiàn)讀、寫等功能，傳輸速率實現(xiàn)為100KBps。在Modelsim6.0仿真軟件環(huán)境中進行仿真，在Xilinx公司的ISE9.li開發(fā)平臺上進行了下載，搭建外圍電路，用Agilem邏輯分析儀進行數(shù)據(jù)采集，分析測試結(jié)果。 首先，介紹了微電子設計的發(fā)展概況以及設計流程，重點介紹了HDL/FPGA的設計流程。其次，對I2C串行總線進行了介紹，重點說明了總線上的數(shù)據(jù)傳輸格式并對所使用的AT24C02 E2PROM存儲器的讀／寫時序作了介紹。第三，基于Verilog _HDL設計了隨機讀/寫的I2C接口電路、測試模塊和顯示電路；接口電路由同步有限狀態(tài)機(FSM)來實現(xiàn)；測試模塊首先將數(shù)據(jù)寫入到AT24C02的指定地址，接著將寫入的數(shù)據(jù)讀出，并將兩個數(shù)據(jù)顯示在外圍LED數(shù)碼管和發(fā)光二極管上，從而直觀地比較寫入和輸出的數(shù)據(jù)的正確性。FPGA下載芯片為Xilinx SPARTAN Ⅲ XC3S200。第四，用Agilent邏輯分析儀進行傳輸數(shù)據(jù)的采集，分析數(shù)據(jù)傳輸?shù)臅r序，從而驗證電路設計的正確性。最后，論文對所取得的研究成果進行了總結(jié)，并展望了下一步的工作。
上傳時間： 2013-06-27
上傳用戶：liuchee
立宇泰ARMSYS 6410開發(fā)板WINCE6.0用戶手冊 http://www.hzlitai.com.cn/S3C6410.html-Li Yutai WINCE6.0 Thai ARM
上傳時間： 2013-04-24
上傳用戶：1583060504
I2C(Inter Integrated Circuits)是Philips公司開發(fā)的用于芯片之間連接的串行總線，以其嚴格的規(guī)范、卓越的性能、簡便的操作和眾多帶I2C接口的外圍器件而得到廣泛的應用并受到普遍的歡迎。 現(xiàn)場可編程門陣列(FPGA)設計靈活、速度快，在數(shù)字專用集成電路的設計中得到了廣泛的應用。本論文主要討論了如何利用Verilog/FPGA來實現(xiàn)一個隨機讀/寫的I2C接口電路，實現(xiàn)與外圍I2C接口器件E2PROM進行數(shù)據(jù)通信，實現(xiàn)讀、寫等功能，傳輸速率實現(xiàn)為100KBps。在Modelsim6.0仿真軟件環(huán)境中進行仿真，在Xilinx公司的ISE9.li開發(fā)平臺上進行了下載，搭建外圍電路，用Agilem邏輯分析儀進行數(shù)據(jù)采集，分析測試結(jié)果。 首先，介紹了微電子設計的發(fā)展概況以及設計流程，重點介紹了HDL/FPGA的設計流程。其次，對I2C串行總線進行了介紹，重點說明了總線上的數(shù)據(jù)傳輸格式并對所使用的AT24C02 E2PROM存儲器的讀／寫時序作了介紹。第三，基于Verilog _HDL設計了隨機讀/寫的I2C接口電路、測試模塊和顯示電路；接口電路由同步有限狀態(tài)機(FSM)來實現(xiàn)；測試模塊首先將數(shù)據(jù)寫入到AT24C02的指定地址，接著將寫入的數(shù)據(jù)讀出，并將兩個數(shù)據(jù)顯示在外圍LED數(shù)碼管和發(fā)光二極管上，從而直觀地比較寫入和輸出的數(shù)據(jù)的正確性。FPGA下載芯片為Xilinx SPARTAN Ⅲ XC3S200。第四，用Agilent邏輯分析儀進行傳輸數(shù)據(jù)的采集，分析數(shù)據(jù)傳輸?shù)臅r序，從而驗證電路設計的正確性。最后，論文對所取得的研究成果進行了總結(jié)，并展望了下一步的工作。
上傳時間： 2013-06-08
上傳用戶：再見大盤雞
移動電源方案功能要求: 1、單芯片控制充電、升壓輸出、電量指示功能，輸出電流可達1A，效率90%以上 按開關(guān)鍵開機6燈頻閃幾次后待機， LI為充電指示，L2頻閃指示有輸出。L2I常亮為輸出充滿指示，L3-L6為電量指示。在輸出時L2頻閃。充電時LI頻閃。當有負載設備連接時自動輸出，無負載電流轉(zhuǎn)為待機。 當按開關(guān)工作后，無負載（無操作）10秒自動關(guān)機。 2、移動電源方案，單芯片控制為內(nèi)電池充電、升壓輸出、電量顯示、邊充邊放；輸入電壓5V、300-1000MA，輸出電壓5V、；輸出電流可達1A，輸出效率90%以上 1）、電性能參數(shù)： USB輸入電壓：DC 5V 輸出DC5V
上傳時間： 2013-11-19
上傳用戶：wangfei22
The CN3052A is a complete constant-current /constant voltage linear charger for single cell Li-ion and Li Polymer rechargeable batteries. The device contains an on-chip power MOSFET and eliminates the need for the external sense resistor and blocking diode.
上傳時間： 2013-11-10
上傳用戶：子虛烏有
Linear Technology offers a variety of devices that simplifyconverting power from a USB cable, but the LTC®3455represents the highest level of functional integration yet. The LTC3455 seamlessly manages power flowbetween an AC adapter, USB cable and Li-ion battery,while complying with USB power standards, all from a4mm × 4mm QFN package. In addtion, two high efficiencysynchronous buck converters generate low voltage railswhich most USB-powered peripherals require. TheLTC3455 also provides power-on reset signals for themicroprocessor, a Hot SwapTM output for poweringmemory cards as well as an uncommitted gain blocksuitable for use as a low-battery comparator or an LDOcontroller. The PCB real estate required for the entire USBpower control circuit and two DC/DC converters is only225mm2.
上傳時間： 2013-11-02
上傳用戶：名爵少年
Although recent popular attention is focused on LithiumIon batteries, one must not forget that other batterychemistries, such as Nickel Cadmium (NiCd) and NickelMetal Hydride (NiMH) have advantages in rechargeablepower systems. Nickel-based batteries are robust, capableof high discharge rates, have good cycle life, do notrequire special protection circuitry and are less expensivethan Li-Ion. Among the two, NiMH batteries are rapidlyreplacing NiCd because of their higher capacity (40% to50% more) and the environmental concerns of the toxiccadmium contained in NiCd batteries.
上傳時間： 2013-11-04
上傳用戶：qq10538412
A number of conventional solutions have been available forthe design of a DC/DC converter where the output voltageis within the input voltage range—a common scenarioin Li-Ion battery-powered applications—but none werevery attractive until now. Conventional topologies, suchas SEPIC or boost followed by buck, have numerousdisadvantages, including low effi ciency, complex magnetics,polarity inversion and/or circuit complexity/cost. TheLTC®3785 buck-boost controller yields a simple, effi cient,low parts-count, single-converter solution that is easyto implement, thus avoiding the drawbacks associatedwith traditional solutions.
上傳時間： 2013-10-21
上傳用戶：ljt101007
The LTC®3562 quad output step-down regulator is designedfor multicore handheld microprocessor applications thatoperate from a single Li-Ion battery. Its four monolithic, higheffi ciency buck regulators support Intel’s mobile CPU P-Stateand C-State energy saving operating modes. The outputvoltages are independently controllable via I2C, and eachoutput can be independently started and shut down. Designerscan choose from power saving pulse-skipping mode orBurst Mode® operation, or select low noise LDO mode. Thespace-saving LTC3562 is available in a 3mm × 3mm QFNpackage and requires few external components.
上傳時間： 2013-10-07
上傳用戶：1583060504
Piezoelectric motors are used in digital cameras for autofocus,zooming and optical image stabilization. Theyare relatively small, lightweight and effi cient, but theyalso require a complicated driving scheme. Traditionally,this challenge has been met with the use ofseparatecircuits, including a step-up converter and an oversizedgeneric full-bridge drive IC. The resulting high componentcount and large board space are especially problematicin the design of cameras for ever shrinking cell phones.The LT®3572 solves these problems by combining astep-up regulator and a dual full-bridge driver in a 4mm× 4mm QFN package. Figure 1 shows a typical LT3572Piezo motor drive circuit. A step-up converter is usedto generate 30V from a low voltage power source suchas a Li-Ion battery or any input power source within thepart’s wide input voltage range of 2.7V to 10V. The highoutput voltage of the step-up converter, adjustable upto 40V, is available for the drivers at the VOUT pin. Thedrivers operate in a full-bridge fashion, where the OUTAand OUTB pins are the same polarity as the PWMA andPWMB pins, respectively, and the OUTA and OUTB pinsare inverted from PWMA and PWMB, respectively. Thestep-up converter and both Piezo drivers have their ownshutdown control. Figure 2 shows a typical layout
上傳時間： 2013-11-18
上傳用戶：hulee
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