目 錄 前 言 ..........................................................................................2 1 嵌入式開發平臺......................................................................4 1.1 ARM 的開發平臺:.........................................................4 1.2 器件選型.........................................................................7 2 工具選擇...............................................................................11 3 編譯和連接............................................................................13 3.1 RVCT 的優化級別與優化方向.......................................16 3.2 Multifile compilation ......................................................21 3.3 調試...............................................................................22 4 操作系統...............................................................................23 4.1 哪里可以得到 os 軟件包 (Open Source and Linux Kernel) ................................................................................25 4.2 安裝鏡像.......................................................................26 4.3 交叉編譯.......................................................................26 總結..........................................................................................27
上傳時間: 2013-04-24
上傳用戶:trepb001
EMI / EMC 設計(一)被動元件的隱藏特性解析 傳統上,EMC 一直被視為「黑色魔術(black magic)」。其實,EMC 是可以藉由數學公式來 理解的。不過,縱使有數學分析方法可以利用,但那些數學方程式對實際的EMC 電路設計而 言,仍然太過復雜了。幸運的是,在大多數的實務工作中,工程師并不需要完全理解那些復 雜的數學公式和存在于EMC 規范中的學理依據,只要藉由簡單的數學模型,就能夠明白要如 何達到EMC 的要求。
標簽: EMC
上傳時間: 2013-06-30
上傳用戶:ndyyliu
免費啊,大家下吧 下完了兄弟們評個分,留個言,交個朋友! linux c 函數大全,介紹linux 下C 語言的函數,對LINUX C開發人員很有用哦,我以前發布過 unix C。
上傳時間: 2013-06-17
上傳用戶:vvbvvb123
A complete design for a data acquisition card for the IBM PC is detailed in this application note. Additionally, C language code is provided to allow sampling of data at speed of more than 20kHz. The speed limitation is strictly based on the execution speed of the "C" data acquisition loop. A "Turbo" XT can acquire data at speeds greater than 20kHz. Machines with 80286 and 80386 processors can go faster than 20kHz. The computer that was used as a test bed in this application was an XT running at 4.77MHz and therefore all system timing and acquisition time measurements are based on a 4.77MHz clock speed.
上傳時間: 2013-10-29
上傳用戶:BOBOniu
PCB LAYOUT 術語解釋(TERMS)1. COMPONENT SIDE(零件面、正面)︰大多數零件放置之面。2. SOLDER SIDE(焊錫面、反面)。3. SOLDER MASK(止焊膜面)︰通常指Solder Mask Open 之意。4. TOP PAD︰在零件面上所設計之零件腳PAD,不管是否鑽孔、電鍍。5. BOTTOM PAD:在銲錫面上所設計之零件腳PAD,不管是否鑽孔、電鍍。6. POSITIVE LAYER:單、雙層板之各層線路;多層板之上、下兩層線路及內層走線皆屬之。7. NEGATIVE LAYER:通常指多層板之電源層。8. INNER PAD:多層板之POSITIVE LAYER 內層PAD。9. ANTI-PAD:多層板之NEGATIVE LAYER 上所使用之絕緣範圍,不與零件腳相接。10. THERMAL PAD:多層板內NEGATIVE LAYER 上必須零件腳時所使用之PAD,一般稱為散熱孔或導通孔。11. PAD (銲墊):除了SMD PAD 外,其他PAD 之TOP PAD、BOTTOM PAD 及INNER PAD 之形狀大小皆應相同。12. Moat : 不同信號的 Power& GND plane 之間的分隔線13. Grid : 佈線時的走線格點2. Test Point : ATE 測試點供工廠ICT 測試治具使用ICT 測試點 LAYOUT 注意事項:PCB 的每條TRACE 都要有一個作為測試用之TEST PAD(測試點),其原則如下:1. 一般測試點大小均為30-35mil,元件分布較密時,測試點最小可至30mil.測試點與元件PAD 的距離最小為40mil。2. 測試點與測試點間的間距最小為50-75mil,一般使用75mil。密度高時可使用50mil,3. 測試點必須均勻分佈於PCB 上,避免測試時造成板面受力不均。4. 多層板必須透過貫穿孔(VIA)將測試點留於錫爐著錫面上(Solder Side)。5. 測試點必需放至於Bottom Layer6. 輸出test point report(.asc 檔案powerpcb v3.5)供廠商分析可測率7. 測試點設置處:Setuppadsstacks
上傳時間: 2013-10-22
上傳用戶:pei5
LAYOUT REPORT .............. 1 目錄.................. 1 1. PCB LAYOUT 術語解釋(TERMS)......... 2 2. Test Point : ATE 測試點供工廠ICT 測試治具使用............ 2 3. 基準點 (光學點) -for SMD:........... 4 4. 標記 (LABEL ING)......... 5 5. VIA HOLE PAD................. 5 6. PCB Layer 排列方式...... 5 7.零件佈置注意事項 (PLACEMENT NOTES)............... 5 8. PCB LAYOUT 設計............ 6 9. Transmission Line ( 傳輸線 )..... 8 10.General Guidelines – 跨Plane.. 8 11. General Guidelines – 繞線....... 9 12. General Guidelines – Damping Resistor. 10 13. General Guidelines - RJ45 to Transformer................. 10 14. Clock Routing Guideline........... 12 15. OSC & CRYSTAL Guideline........... 12 16. CPU
上傳時間: 2013-12-20
上傳用戶:康郎
Speed and accuracy don’t always go hand-in-handin DC/DC converter systems—that is, until now. TheLTC3811 is a dual output, fi xed frequency current modeDC/DC switching regulator controller designed for one oftoday’s most demanding power supply applications: highcurrent, low voltage processor core supplies.
上傳時間: 2013-11-21
上傳用戶:aix008
Alkaline batteries are convenient because they’re easy tofi nd and relatively inexpensive, making them the powersource of choice for portable instruments and devicesused for outdoor recreation. Their long shelf life alsomakes them an excellent choice for emergency equipmentthat may see infrequent use but must be ready to go on amoment’s notice. It is important that the DC/DC convertersin portable devices operate over the widest possiblebattery voltage range to extend battery run time, and thussave the user from frequent battery replacement.
上傳時間: 2014-12-24
上傳用戶:569342831
The LTC®4155 and LTC4156 are dual multiplexed-inputbattery chargers with PowerPath™ control, featuring I2Cprogrammability and USB On-The-Go for systems suchas tablet PCs and other high power density applications.The LTC4155’s float voltage (VFLOAT) range is optimizedfor Li-Ion batteries, while the LTC4156 is optimized forlithium iron phosphate (LiFePO4)batteries, supportingsystem loads to 4A with up to 3.5A of battery chargecurrent. I2C controls a broad range of functions and USBOn-The-Go functionality is controlled directly from theUSB connector ID pin.
上傳時間: 2013-10-09
上傳用戶:hanhanj
內容提要: PIC系列微控器系統結構和工作原理 PIC系列微制器的指令系統 PIC系列微控器匯編言程序設計等。 PIC系列單片機原理和程序設計》 pdf 竇振中 北京航空航天大學出版社 本書介紹當前在十分繁榮的單片機世界中異軍突起的一種單片機——Microchip公司的PIC系列單片機。這個系列單片機具有以下體現微控制器工業發展新趨勢的特點:高速度、低工作電壓、低功耗、I/O口直接驅動LED能力、低價位、小體積、指令簡單易學易用等。內容包括:該系列主要芯片的系統結構和工作原理;片內各種豐富的部件和資源的使用方法;全系列芯片的指令系統和匯編語言程序設計技術及實例;提供了常用的運算子程序。本書內容全面而實用,語言邏輯性強,通俗流暢,易學易懂,適于作廣大從事單片機開發與應用的工程技術人員的自學用書和大學相關專業研究生、本科、專科、中專各種單片機應用畢業設計的參考用書以及培訓班的教材。
上傳時間: 2014-12-25
上傳用戶:yd19890720