We are in the era of ubiquitous computing in which the use and development of Radio Frequency Iden- tification (RFID) is becoming more widespread. RFID systems have three main components: readers, tags, and database. An RFID tag is composed of a small microchip, limited logical functionality, and an antenna. Most common tags are passive and harvest energy from a nearby RFID reader. This energy is used both to energize the chip and send the answer back to the reader request. The tag provides a unique identifier (or an anonymized version of that), which allows the unequivocal identification of the tag holder (i.e. person, animal, or items).
上傳時間： 2020-06-08
上傳用戶：shancjb
Sound is simply an airborne version of vibration. The air which carries sound is a mixture of gases. In gases, the molecules contain so much energy that they break free from their neighbors and rush around at high speed. As Figure 1.1(a) shows, the innumerable elastic collisions of these high-speed molecules produce pressure on the walls of any gas container. If left undisturbed in a container at a constant temperature, eventually the pressure throughout would be constant and uniform.
標簽： Engineering Audio
上傳時間： 2020-06-09
上傳用戶：shancjb
Computer science as an academic discipline began in the 1960’s. Emphasis was on programming languages, compilers, operating systems, and the mathematical theory that supported these areas. Courses in theoretical computer science covered finite automata, regular expressions, context-free languages, and computability. In the 1970’s, the study of algorithms was added as an important component of theory. The emphasis was on making computers useful. Today, a fundamental change is taking place and the focus is more on a wealth of applications. There are many reasons for this change. The merging of computing and communications has played an important role. The enhanced ability to observe, collect, and store data in the natural sciences, in commerce, and in other fields calls for a change in our understanding of data and how to handle it in the modern setting. The emergence of the web and social networks as central aspects of daily life presents both opportunities and challenges for theory.
標簽： Foundations Science Data of
上傳時間： 2020-06-10
上傳用戶：shancjb
興起于上世紀80年代末，并于1990年被IEEE 標準協會接納為IEEE1149.1標準的JTAG 技術，其產生的背景是對高密度集成電路板進行故障檢測，現在已被廣泛用于支持芯片測試、設備編程、混合信號測試和現場服務等領域。本文首先介紹了」TAG 接口的定義及其具體結構，對邊界掃描的具體工作過程進行了分析，并列舉了幾種常用功能;在此基礎上以M SP430 系列Flash 型單片機為對象探討了如何實現對具有JTA G接口的Flash芯片的在線編程與調試，并給出了具體實例。
上傳時間： 2021-10-29
上傳用戶：zhaiyawei
實現多種卡片的訪問 場景介紹 應用或者其他模塊可以通過接口完成以下功能： 1. 訪問 NfcA 技術的 Tag 卡片。 2. 訪問 NfcB 技術的 Tag 卡片 3. 訪問 IsoDep 協議的 Tag 卡片。 4. 訪問 Ndef 協議的 Tag 卡片。 5. 訪問 MifareClassic 技術的 Tag 卡片
上傳時間： 2021-11-14
上傳用戶：20125101110
Xilinx FPGA Virtex-7 全系列（AD集成封裝庫），IntLib后綴文件，PCB封裝帶3D視圖，拆分后文件為PcbLib+SchLib格式，Altium Designer原理圖庫+PCB封裝庫，集成封裝型號列表：Library Component Count : 157Name Description----------------------------------------------------------------------------------------------------XC7V2000T-1FHG1761C Virtex-7 FPGA, 1200 User I/Os, 36 GTX, 1760-Ball BGA, Speed Grade 1, Commerical Grade, Pb-FreeXC7V2000T-1FHG1761I Virtex-7 FPGA, 1200 User I/Os, 36 GTX, 1760-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FreeXC7V2000T-1FLG1925C Virtex-7 FPGA, 1200 User I/Os, 16 GTX, 1924-Ball BGA, Speed Grade 1, Commercial Grade, Pb-FreeXC7V2000T-1FLG1925I Virtex-7 FPGA, 1200 User I/Os, 16 GTX, 1924-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FreeXC7V2000T-2FHG1761C Virtex-7 FPGA, 1200 User I/Os, 36 GTX, 1760-Ball BGA, Speed Grade 2, Commerical Grade, Pb-FreeXC7V2000T-2FLG1925C Virtex-7 FPGA, 1200 User I/Os, 16 GTX, 1924-Ball BGA, Speed Grade 2, Commercial Grade, Pb-FreeXC7V2000T-2GFHG1761EVirtex-7 FPGA, 1200 User I/Os, 36 GTX, 1760-Ball BGA, Speed Grade 2G, Extended Grade, Pb-FreeXC7V2000T-2GFLG1925EVirtex-7 FPGA, 1200 User I/Os, 16 GTX, 1924-Ball BGA, Speed Grade 2G, Extended Grade, Pb-FreeXC7V2000T-2LFHG1761EVirtex-7 FPGA, 1200 User I/Os, 36 GTX, 1760-Ball BGA, Speed Grade 2L, Extended Grade, Pb-FreeXC7V2000T-2LFLG1925EVirtex-7 FPGA, 1200 User I/Os, 16 GTX, 1924-Ball BGA, Speed Grade 2L, Extended Grade, Pb-FreeXC7V585T-1FFG1157C Virtex-7 FPGA, 850 User I/Os, 20 GTX, 1156-Ball BGA, Speed Grade 1, Commercial Grade, Pb-FreeXC7V585T-1FFG1157I Virtex-7 FPGA, 850 User I/Os, 20 GTX, 1156-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FreeXC7V585T-1FFG1761C Virtex-7 FPGA, 850 User I/Os, 36 GTX, 1760-Ball BGA, Speed Grade 1, Commercial Grade, Pb-FreeXC7V585T-1FFG1761I Virtex-7 FPGA, 850 User I/Os, 36 GTX, 1760-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FreeXC7V585T-2FFG1157C Virtex-7 FPGA, 850 User I/Os, 20 GTX, 1156-Ball BGA, Speed Grade 2, Commercial Grade, Pb-FreeXC7V
上傳時間： 2021-12-22
上傳用戶：aben
Xilinx FPGA Artix-7 全系列（AD集成封裝庫），IntLib后綴文件，PCB封裝帶3D視圖，拆分后文件為PcbLib+SchLib格式，Altium Designer原理圖庫+PCB封裝庫，集成封裝型號列表：Library Component Count : 48Name Description----------------------------------------------------------------------------------------------------XC7A100T-1CSG324C Artix-7 FPGA, 210 User I/Os, 0 GTP, 324-Ball BGA, Speed Grade 1, Commercial Grade, Pb-FreeXC7A100T-1CSG324I Artix-7 FPGA, 210 User I/Os, 0 GTP, 324-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FreeXC7A100T-1FGG484C Artix-7 FPGA, 285 User I/Os, 4 GTP, 484-Ball BGA, Speed Grade 1, Commercial Grade, Pb-FreeXC7A100T-1FGG484I Artix-7 FPGA, 285 User I/Os, 4 GTP, 484-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FreeXC7A100T-1FGG676C Artix-7 FPGA, 300 User I/Os, 8 GTP, 676-Ball BGA, Speed Grade 1, Commercial Grade, Pb-FreeXC7A100T-1FGG676I Artix-7 FPGA, 300 User I/Os, 8 GTP, 676-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FreeXC7A100T-1FTG256C Artix-7 FPGA, 170 User I/Os, 0 GTP, 256-Ball BGA, Speed Grade 1, Commercial Grade, Pb-FreeXC7A100T-1FTG256I Artix-7 FPGA, 170 User I/Os, 0 GTP, 256-Ball BGA, Speed Grade 1, Industrial Grade, Pb-FreeXC7A100T-2CSG324C Artix-7 FPGA, 210 User I/Os, 0 GTP, 324-Ball BGA, Speed Grade 2, Commercial Grade, Pb-FreeXC7A100T-2CSG324I Artix-7 FPGA, 210 User I/Os, 0 GTP, 324-Ball BGA, Speed Grade 2, Industrial Grade, Pb-FreeXC7A100T-2FGG484C Artix-7 FPGA, 285 User I/Os, 4 GTP, 484-Ball BGA, Speed Grade 2, Commercial Grade, Pb-FreeXC7A100T-2FGG484I Artix-7 FPGA, 285 User I/Os, 4 GTP, 484-Ball BGA, Speed Grade 2, Industrial Grade, Pb-FreeXC7A100T-2FGG676C Artix-7 FPGA, 300 User I/Os, 8 GTP, 676-Ball BGA, Speed Grade 2, Commercial Grade, Pb-FreeXC7A100T-2FGG676I Artix-7 FPGA, 300 User I/Os, 8 GTP, 676-Ball BGA, Speed Grade 2, Industrial Grade, Pb-FreeXC7A100T-2FTG256C Artix-7 FPGA, 170 User I/Os, 0 GTP, 256-Ball BGA, Speed Grade 2, Commercial Grade, Pb-FreeXC7A100T-2FTG256I Artix-7 FPGA, 170 User I/Os, 0 GTP, 2
上傳時間： 2021-12-22
上傳用戶：
這是介紹藍牙電話免提協議的最新文檔,
上傳時間： 2022-02-01
上傳用戶：
The PW2601 is a charger front-end integrated circuit designed to provide protection to Li-ionbatteries from failures of charging circuitry. The device monitors the input voltage, battery voltageand the charging current to make sure all three parameters are operated in normal range. Thedevice will switch off internal MOSFET to disconnect IN to OUT to protect load when any of inputvoltage, output current exceeds the threshold. The Over temperature protection (OTP) functionmonitors chip temperature to protect the device. The PW2601 also can protect the system’sbattery from being over charged by monitors the battery voltage continuously. The deviceoperates like a linear regulator, maintaining a 5.1V output with input voltages up to the input overvoltage threshold.The PW2601 is available in DFN-2x2-8L package. Standard products are Pb-free and Halogenfree
標簽： pw2601
上傳時間： 2022-02-11
上傳用戶：
射頻識別（Radiofrequency identification，RFID），又稱電子標簽（E-Tag），是一種利用射頻信號自動識別目標對象并獲取相關信息的技術。隨著技術的進步，RFID應用領域日益擴大，現已涉及到人們日常生活的各個方面，并將成為未來信息社會建設的一項基礎技術。因此，研究、設計和開發RFID系統具有十分重要的理論意義和實際意義。論文系統地論述了射頻識別系統和讀卡器的理論分析，研究了射頻識別系統中的許多關鍵技術，并提出了射頻識別讀卡器的設計方案。本文首先分析了射頻識別技術的基本原理、研究方向和應用情況。在充分研究了射頻卡的基本原理、技術特點、國際相關標準后，進而提出了基于STC11F32單片機的射頻讀卡器系統設計的方法。設計采用MFRC522射頻讀寫模塊在STC11F32單片機的控制下實現對Mifare卡的讀寫訪問操作。硬件部分設計主要包括單片機控制電路設計，射頻模塊設計，天線電路設計，串行通信電路設計，聲音提示及顯示電路設計等，其中詳細討論了讀卡器的軟件設計方法。軟件設計包括單片機處理程序，射頻基站芯片RC522的基本操作、Mifare卡操作程序設計、聲音提示及顯示部分程序等。論文中系統地討論了軟件實現讀卡器與Mifare卡之間通信所要求的請求應答、防沖撞、選卡片、認證、讀寫等功能模塊的實現原理。
上傳時間： 2022-06-19
上傳用戶：qingfengchizhu
