亚洲欧美第一页_禁久久精品乱码_粉嫩av一区二区三区免费野_久草精品视频

蟲蟲首頁| 資源下載| 資源專輯| 精品軟件
登錄| 注冊

fly-over

  • 西門子S7-300 PLC模擬量轉換

    Analog Inputs and Outputs in an S7 PLC are represented in the PLC as a 16-bit integer. Over the nominal span of the analog input or output, the value of this integer will range between - 27648 and +27648. However, it is easier to use the analog values if they are scaled to the same units and ranges as the process being controlled. This applications tip describes methods for scaling analog values to and from engineering units.

    標簽: 300 PLC 西門子 模擬量

    上傳時間: 2013-11-17

    上傳用戶:3294322651

  • MAXX9257 MAX9258芯片可編程SerDes持續(xù)時間計算

    The MAX9257/MAX9258 programmable serializer/deserializer (SerDes) devices transfer both video data and control signals over the same twisted-pair cable. However, control data can only be transmitted during the vertical blank time, which is indicated by the control-channel-enabled output (CCEN) signal. The electronic control unit (ECU) firmware designer needs to know how quickly to respond to the CCEN signal before it times out and how to calculate this duration. This application note describes how to calculate the duration of the CCEN for the MAX9257/MAX9258 SerDes chipset. The calculation is based on STO timeout, clock frequency, and UART bit timing. The CCEN duration is programmable and can be closed if not in use.

    標簽: SerDes MAXX 9257 9258

    上傳時間: 2014-01-24

    上傳用戶:xingisme

  • DS34S132(TDMoP)IC與其它TDMoP器件的互操作

      摘要:互操作性是一個系統(tǒng)經(jīng)過很少甚至無需系統(tǒng)操作員介入而實現(xiàn)與其它系統(tǒng)協(xié)同工作的能力。系統(tǒng)的互操作性使其有可能為其它系統(tǒng)提供服務或接受其它系統(tǒng)的服務,使得不同廠商的系統(tǒng)能夠協(xié)同工作。本應用筆記介紹如何設置DS34S132 TDM-over-Packet (TDMoP) IC,使其與其它TDMoP器件實現(xiàn)互操作。   引言   毋庸諱言,當今的通信系統(tǒng)需要不同設備和設備之間的復雜交互。隨著技術的進步,互操作性也變得更加重要?;ゲ僮餍允且粋€系統(tǒng)經(jīng)過很少甚至無需系統(tǒng)操作員介入而實現(xiàn)與其它系統(tǒng)協(xié)同工作的能力。系統(tǒng)的互操作性使其有可能為其它系統(tǒng)提供服務或接受其它系統(tǒng)的服務,從而使不同廠商的系統(tǒng)能夠協(xié)同工作。   本應用筆記著重介紹Maxim TDM-over-Packet (TDMoP) IC,DS34S132。文章介紹了在DS34S132與其他廠商TDMoP器件之間實現(xiàn)互操作性的設置要求。

    標簽: TDMoP S132 132 34S

    上傳時間: 2013-10-27

    上傳用戶:angle

  • Atmel AT89C系列單片機電路板設計指南

    Designing Boards with Atmel AT89C51,AT89C52, AT89C1051, and AT89C2051 for Writing Flash at In-Circuit Test. Recent improvements in chips and testers have made it possible for the tester to begin taking over the role tradi-tionally assigned to the PROM program-mer. Instead of having a PROM pro- grammer write nonvolatile memories before assembling the board, the in-cir- cuit tester writes them during in-circuit testing operations. Many Teradyne Z18- series testers are now in use loading code into nonvolatile memories, micro- controllers and in-circuit programmable logic devices. The purpose of this note is to explain how the Z18 approaches the writing task for Atmel AT89C series IC’s, so that designers of boards using these chips can get the best results.  

    標簽: Atmel 89C AT 89

    上傳時間: 2013-11-17

    上傳用戶:xiaozhiqban

  • 基于C8051F930的管道溫度壓力遠程監(jiān)測系統(tǒng)

       為解決輸油管道溫度壓力參數(shù)實時監(jiān)測的問題,設計了以C8051F930單片機作為控制核心的超低功耗輸油管道溫度壓力遠程監(jiān)測系統(tǒng)。現(xiàn)場儀表使用高精度電橋采集數(shù)據(jù),通過433 MHz短距離無線通信網(wǎng)絡與遠程終端RTU進行通信,RTU通過GPRS網(wǎng)絡與PC上位機進行遠程數(shù)據(jù)傳輸,在上位機中實現(xiàn)數(shù)據(jù)存儲和圖形化界面顯示,從而實現(xiàn)輸油管道溫度壓力參數(shù)的實時監(jiān)測和異常報警。經(jīng)實驗證明,該系統(tǒng)的12位數(shù)據(jù)采集精度滿足設計要求,漏碼率小于1%,正常工作時間超過5個月,能實時有效地監(jiān)測輸油管道的溫度壓力參數(shù),節(jié)省大量人工成本,有效預防管道參數(shù)異常造成的經(jīng)濟損失和環(huán)境污染。 Abstract:  In order to solve the problems on real-time monitoring of pipeline temperature and pressure parameters, the ultra-low power remote pipeline temperature and pressure monitoring system was designed by using the single chip processor C8051F930 as the control core. The high-precision electric bridge was used in field instruments for data collection, the 433MHz short-range wireless communication network was used to make communication between field instrument and RTU, the GPRS was used by the RTU to transmit data to the PC host computer, and the data was stored and displayed in the PC host computer, so the real-time monitoring and exception alerts of pipeline temperature and pressure parameters were achieved. The experiment proves that the system of which error rate is less than 1% over five months working with the 12-bit data acquisition accuracy can effectively monitor the pipeline temperature and pressure parameters in real time, it saves a lot of labor costs and effectively prevents environmental pollution and economic losses caused by abnormal channel parameters.

    標簽: C8051F930 溫度 壓力 遠程監(jiān)測系統(tǒng)

    上傳時間: 2013-11-07

    上傳用戶:cuibaigao

  • 基于雙ATmega128的安檢力學試驗機設計

    針對當前安檢力學試驗機所能完成的試驗種類單一、自動化程度低等問題,提出一種以ATmega128單片機為核心控制器的安檢力學試驗機的設計。詳細闡述了該安檢力學試驗機各個組成部分的設計原理和方案,并且給出了各部分的軟件設計思想和操作流程。經(jīng)過大量測試試驗表明:設計的安檢力學試驗機可以完成多達十余種的力學安檢試驗,完全符合相關國家標準,并且具有數(shù)據(jù)采集精度高、傳輸速度快、操作安全簡便等特點,實現(xiàn)了安檢設備的多功能化、數(shù)字化和自動化。 Abstract:  Currently, many mechanical security testing machines have only one function. The degree of automation of them is low. To solve those problems, a new kind of mechanical security testing machine, using ATmega128 micro-controller as its core controller, has been advanced. It describes the components of the machine. The principles and the scheme in the designing processes are presented in detail, and the software architecture and the operation processes of each part are given. After having done many testing, we have reached the following conclusions: the mechanical security testing machine presented can do over ten mechanical security tests complying with related national standards. It has high data acquisition accuracy and high transmission speed. The operation of the machine is simple and safe. In general, this machine is a multi-functional, highly automatic, digitalized security testing device.

    標簽: ATmega 128 安檢 試驗機

    上傳時間: 2013-11-05

    上傳用戶:a67818601

  • SN65LBC170,SN75LBC170,pdf(TRIP

    The SN65LBC170 and SN75LBC170 aremonolithic integrated circuits designed forbidirectional data communication on multipointbus-transmission lines. Potential applicationsinclude serial or parallel data transmission, cabledperipheral buses with twin axial, ribbon, ortwisted-pair cabling. These devices are suitablefor FAST-20 SCSI and can transmit or receivedata pulses as short as 25 ns, with skew lessthan 3 ns.These devices combine three 3-state differentialline drivers and three differential input linereceivers, all of which operate from a single 5-Vpower supply.The driver differential outputs and the receiverdifferential inputs are connected internally to formthree differential input/output (I/O) bus ports thatare designed to offer minimum loading to the buswhenever the driver is disabled or VCC = 0. Theseports feature a wide common-mode voltage rangemaking the device suitable for party-lineapplications over long cable runs.

    標簽: 170 LBC SN TRIP

    上傳時間: 2013-10-13

    上傳用戶:ytulpx

  • LSI邏輯公司的低成本語音處理器

    LSI邏輯公司的低成本語音處理器 目前,對適合家庭和小辦公室應用的Voice over IP (VoIP)的解決方案的需求在不斷增長。市場需求的是非常低成本的兩到四路語音話路。LSI邏輯公司的解決方案能夠以非常低的成本卻非常有效地處理高達四路的語音話路,并且可在電話適配器、寬帶調制解調器以及路由器、網(wǎng)關中得到廣泛應用。這些產(chǎn)品的基本組成部分包括語音處理子系統(tǒng)、主處理器、網(wǎng)絡接口和用戶線路接口(SLIC)設備。

    標簽: LSI 邏輯 語音處理器

    上傳時間: 2013-10-14

    上傳用戶:acwme

  • PCA9517 Level translating I2C-

    The PCA9517 is a CMOS integrated circuit that provides level shifting between lowvoltage (down to 0.9 V) and higher voltage (2.7 V to 5.5 V) I2C-bus or SMBus applications.While retaining all the operating modes and features of the I2C-bus system during thelevel shifts, it also permits extension of the I2C-bus by providing bidirectional buffering forboth the data (SDA) and the clock (SCL) lines, thus enabling two buses of 400 pF. Usingthe PCA9517 enables the system designer to isolate two halves of a bus for both voltageand capacitance. The SDA and SCL pins are over voltage tolerant and arehigh-impedance when the PCA9517 is unpowered.

    標簽: translating Level 9517 PCA

    上傳時間: 2013-12-25

    上傳用戶:wsf950131

  • PCA9519 4channel level transla

    The PCA9519 is a 4-channel level translating I2C-bus/SMBus repeater that enables theprocessor low voltage 2-wire serial bus to interface with standard I2C-bus or SMBus I/O.While retaining all the operating modes and features of the I2C-bus system during thelevel shifts, it also permits extension of the I2C-bus by providing bidirectional buffering forboth the data (SDA) and the clock (SCL) lines, thus enabling the I2C-bus or SMBusmaximum capacitance of 400 pF on the higher voltage side. The SDA and SCL pins areover-voltage tolerant and are high-impedance when the PCA9519 is unpowered.

    標簽: 4channel transla level 9519

    上傳時間: 2013-11-19

    上傳用戶:jisiwole

主站蜘蛛池模板: 纳雍县| 迁西县| 邢台县| 克拉玛依市| 辽宁省| 原阳县| 永修县| 德阳市| 田阳县| 昔阳县| 太仓市| 长武县| 南京市| 临猗县| 右玉县| 临漳县| 满洲里市| 晋城| 林口县| 威宁| 本溪市| 茶陵县| 策勒县| 固原市| 宿迁市| 平邑县| 屏南县| 武功县| 沾化县| 类乌齐县| 高唐县| 建湖县| 巴东县| 循化| 铜陵市| 哈尔滨市| 义乌市| 惠来县| 任丘市| 嘉黎县| 平武县|