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
Handheld electronic devices play a key role in our everydaylives. Because dependability is paramount, handhelds arecarefully engineered with lightweight power sources forreliable use under normal conditions. But no amount ofcareful engineering can prevent the mistreatment theywill undergo at the hands of humans. For example, whathappens when a factory worker drops a bar code scanner,causing the battery to pop out? Such events areelectronically unpredictable, and important data storedin volatile memory would be lost without some form ofsafety net—namely a short-term power holdup systemthat stores suffi cient energy to supply standby power untilthe battery can be replaced or the data can be stored inpermanent memory.
上傳時間： 2013-11-05
上傳用戶：coeus
We would like to welcome you as a user of the Allegro CX, a rugged, handheld fi eld PC for data collection. Developed with the input of data collection professionals worldwide, the Allegro CX is adaptable and versatile for use in a wide variety of data collection environments. The Allegro CX continues to utilize our ergonomic, lightweight design that is standard in our line of Allegro Field PCs. This design makes your Allegro easy to use for extended periods while moving to and from data collection sites in the fi eld.
上傳時間： 2015-01-02
上傳用戶：zhangyi99104144
This article discusses some issues that a typical Windows C++ programmer will encounter when approaching Symbian OS for the first time. Our experience in developing for three successive versions of Symbian OS has given us considerable perspective on what can be difficult when working in this otherwise rich and stable environment. While one reason for Symbian s success may be the desire of many mobile phone manufacturers not to be tied to Microsoft, the other reason is that Symbian has put together a lightweight, elegant system that succeeds in providing a very impressive range of functionality. Here are some pointers to help ease the transition to successful Symbian OS application development.
標簽： programmer discusses encounter article
上傳時間： 2017-07-30
上傳用戶：zhaiyanzhong
lwip是一個輕量級的TCP/IP協議棧（lightweight TCP/IP Stack）實現，最初是瑞士計算機科學學院Adam Dunkels編寫的一個應用于無操作系統的嵌入式系統中的TCP/IP協議棧，后來作為一個開源（open source）項目，由一個全球性的團隊進行開發和維護。
上傳時間： 2016-06-13
上傳用戶：tttm1030
VIP專區-嵌入式/單片機編程源碼精選合集系列（74）資源包含以下內容：1. Using lightweight IP with the Nios II Processor_nios2_lwip_tutorial,This tutorial familiarizes you w.2. 包含了CS8900的接口原理圖.3. NE2000兼容網卡驅動編寫指南.4. ARM開發流程 ppt文檔.5. ping指令詳解, c語言編寫.6. NIOS II UART 測試程序.7. NIOS II 與USB接口的程序.8. AD9852 串行控制子程序.9. 可以測量馬達的實際轉速,用的IC 是AT89C2051,也可以用于AT89C51.10. Keil工具Hello word源碼.11. LCD1601的液晶程序.12. LCD1602的程序.13. 電話遠程控制的想法已有一段是時間.14. 這是一個小時計的程序.15. SONY的液晶驅動程序,包括音量,亮度的調整,值得參考一下..16. CPLD在DS—FH混合擴頻通信系統中的應用.17. 基于LPC2131的SPI編程驅動,主機方式,查詢方式.18. pwm電機步進控制.19. SL811 USB 開發代碼.20. 基于UCM40的超聲波測距函數,可測0.08---2.5米距離,數值精確.21. S3C2440開發板原理圖.22. EVMDM642開發板的詳細硬件介紹及原理圖。PDF格式。.23. 經典的dds發生器ad9851vhdl的并行通信代碼.24. mpc2872系列的usb controller產生sof源碼.25. TI 的TMS320F2812芯片的開發板原理圖和說明.26. 一份基于AT89C51SND1A控制的MP3原理圖.27. 基于三星S3C2410 ARM芯片的開發板原理圖.28. EVB使用CreateProcess API 呼叫IE 撥放wma 範例.29. FlashROM的存儲控件操作源代碼.30. 鍵盤Key濾波功能源代碼.31. altera的usb下載線的制作資料.32. 嵌入式系統中,從任意一點到任意一點畫直線算法程序.33. 本程序是用VHDL語言實現對AD控制.34. 該程序應用輪換查詢的方式實現了鍵盤的掃描.35. 該程序為niosＩＩ環境下的１３０２編程可以直接應用.36. TMS320F2812原理圖設計,不是很完善。希望高人指點。.37. Mega16微打驅動.38. ACN協議 Artnet協議 DMX512-A 調光網絡.39. NIOSII 實驗指導.40. xilinx 開發板原理圖,里面含有pcb圖,自己完全可以做一塊來玩,不用買別人的,很省錢,又鍛煉了自己..
上傳時間： 2013-06-17
上傳用戶：eeworm
