PCB LAYOUT技術大全---初學者必看! PROTEL相關疑問 1.原理圖常見錯誤: (1)ERC報告管腳沒有接入信號: a. 創建封裝時給管腳定義了I/O屬性; b.創建元件或放置元件時修改了不一致的grid屬性,管腳與線沒有連上; c. 創建元件時pin方向反向,必須非pin name端連線。 (2)元件跑到圖紙界外:沒有在元件庫圖表紙中心創建元件。 (3)創建的工程文件網絡表只能部分調入pcb:生成netlist時沒有選擇為global。 (4)當使用自己創建的多部分組成的元件時,千萬不要使用annotate. 2.PCB中常見錯誤: (1)網絡載入時報告NODE沒有找到: a. 原理圖中的元件使用了pcb庫中沒有的封裝; b. 原理圖中的元件使用了pcb庫中名稱不一致的封裝; c. 原理圖中的元件使用了pcb庫中pin number不一致的封裝。如三極管:sch中pin number 為e,b,c, 而pcb中為1,2,3。
上傳時間: 2013-10-20
上傳用戶:kbnswdifs
Abstract: This application note discusses the REF pin functionality in the indirect current-feedbackarchitecture for instrumentation amplifiers. This article compares the importance of a REF buffer in a
上傳時間: 2015-01-03
上傳用戶:時代將軍
要生產音頻脈沖,只要算出某一音頻的周期(1/頻率),可以利用定時器計時的方式得到此頻率的脈沖。而Arduino平臺“封裝”了新的數字輸出函數tone()。更簡易的實現喇叭和蜂鳴器唱歌。 tone(pin, frequency),Arduino會向指定pin發送制定頻率的方波,執行noTone()函數來停止。 tone(pin, frequency, duration方法多了一個參數,代表發送方波持續的時間,到時自動停止發送信號,就不需要noTone()函數。 利用tone()函數播放音樂,只需要查表了解各個音符對應的頻率,還要求個人稍微能看懂音樂譜子的節拍。 物料清單 : Arduino 328控制板 1塊 8Ω 0.5W的喇叭(或者蜂鳴器) 1個(ATmega328的驅動能力足夠,直接拉電流就ok!) 12Ω電阻(限流) 1個 實物圖:
上傳時間: 2013-10-14
上傳用戶:jiangxiansheng
SL811開發資料_包含源程序_電路圖_芯片資料:SL811HS Embedded USB Host/Slave Controller.The SL811HS is an Embedded USB Host/Slave Controller capable of communicate with either full-speed or low-speed USB peripherals. The SL811HS can interface to devices such as microprocessors, microcontrollers, DSPs, or directly to a variety of buses such as ISA, PCMCIA, and others. The SL811HS USB Host Controller conforms to USB Specification 1.1.The SL811HS USB Host/Slave Controller incorporates USB Serial Interface functionality along with internal full-/low-speed transceivers.The SL811HS supports and operates in USB full-speed mode at 12 Mbps, or at low-speed 1.5-Mbps mode.The SL811HS data port and microprocessor interface provide an 8-bit data path I/O or DMA bidirectional, with interrupt support to allow easy interface to standard microprocessors or microcontrollers such as Motorola or Intel CPUs and many others. Internally,the SL811HS contains a 256-byte RAM data buffer which is used for control registers and data buffer.The available package types offered are a 28-pin PLCC (SL811HS) and a 48-pin TQFP package (SL811HST-AC). Both packages operate at 3.3 VDC. The I/O interface logic is 5V-tolerant.
上傳時間: 2013-12-22
上傳用戶:a82531317
superpro 3000u 驅動 PIC16C65B@QFP44 [SA245] PIC16C65B: Part number QFP44: Package in QFP44 SA245: Adapter purchase number AM29DL320GT@FBGA48 [SA642+B026] AM29DL320GT: Part number FBGA48: Package in FBGA48 SA642: Adapter purchase number (Top board with socket) B026: Adapter purchase number (Bottom board, exchangable for different parts) 87C196CA@PLCC68(universal adapter) [PEP+S414T] 87C196CA: Part number PLCC68: Package in PLCC68 universal adapter: this adapter is valid for all parts in this package PEP: The PEP (Pin-driver Expansion Pack necessary to work with the adapter S414T) S414T: Adapter purchase number (Universal for all parts in this package) S71PL127J80B@FBGA64(special adapter) [(SA642A-B079A-Y096AF001)] S71PL127J80B: Part number FBGA64: Package in FBGA64 special adapter: this adapter is valid for this
上傳時間: 2014-03-27
上傳用戶:ippler8
One of the most important issues affecting the implementation of microcontroller software deals with the data-decision algorithm. Data-decision refers to decoding the DIO-pin from the CC400/CC900. Two main principles exist for decoding Manchester-coded data: Data decision based on timing the period between transitions, and data decision based on oversampling.
標簽: microcontroller implementation important affecting
上傳時間: 2013-12-18
上傳用戶:671145514
C#電信管理系統,有PIN號管理,用戶查詢,掛失,帳單查詢,每月話費,對沖...(麻雀雖小,五藏具全)
上傳時間: 2014-12-01
上傳用戶:yt1993410
YSS915 (KP2V2) is an LSI for processing Karaoke voice signals. This LSI has an A/D converter (1 channel) for the microphone echo, and a memory for the microphone echo and key control. These features allow achieving the functions needed for the Karaoke system by using only one LSI chip. As for the microphone echoes, many other types of echoes are available in addition to ordinary ones so that YSS915 is applicable to various uses. In addition to these Karaoke programs, YSS915 is able to provide the Movie & Music programs, with which the surround effect is applied to the movie and music sources for giving the users more enjoyment. YSS915 is pin compatible with and register compatible with YSS903 (KP2V).
標簽: processing LSI converter Karaoke
上傳時間: 2015-06-23
上傳用戶:lijianyu172
When the P89LPC90x is in programming mode all pins that are not used for programming are tri-stated. During programming mode the reset pin has a weak pull-up resistor.
標簽: programming tri-stated are When
上傳時間: 2015-11-03
上傳用戶:集美慧
qemu性能直逼VMware的仿真器QEMU 的模擬速度約為實機的 25%;約為 Bochs 的 60 倍。Plex86、User-Mode-Linux、VMware 和 Virtual PC 則比 QEMU 快一點,但 Bochs 需要特定的 Kernel Patch;User-Mode-Linux 的 Guest System 必須為 Linux;VMware 和 Virtual PC 則需要在 Guest System 上安裝特定的 Driver,且它們是針對作業系統而進行模擬,並不能說是完整的模擬器。所以 QEMU 仍不失為極優秀的 x86 模擬器。
標簽: VMware User-Mode-Linux Virtual Bochs
上傳時間: 2014-06-04
上傳用戶:bakdesec