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time-limit

DN465 超低功耗升壓轉換器

Industrial remote monitoring systems and keep-alivecircuits spend most of their time in standby mode. Manyof these systems also depend on battery power, so powersupply effi ciency in standby state is very important tomaximize battery life. The LT®8410/-1 high effi ciencyboost converter is ideal for these systems, requiringonly 8.5μA of quiescent current in standby mode. Thedevice integrates high value (12.4M/0.4M) output feedbackresistors, signifi cantly reducing input current whenthe output is in regulation with no load. Other featuresinclude an integrated 40V switch and Schottky diode,output disconnect with current limit, built in soft-start,overvoltage protection and a wide input range, all in atiny 8-pin 2mm × 2mm DFN package.

標簽： 465 DN 超低功耗升壓轉換器

上傳時間： 2013-11-23

上傳用戶：新手無憂
單片機控制的鉛酸蓄電池充電電源

為了有效地提升鉛酸蓄電池的使用壽命，同時實現對充電過程的監控，設計出一種用單片機控制的36 V鉛酸蓄電池充電電源。本電路采用反激式拓撲，連續電流工作模式，電源管理IC設計在電源的副邊，由ELAN公司的EM78P258N單片機模擬，是用可編程器件模擬電源管理IC，實現智能電源低成本化的一次成功嘗試，通過對單片機的軟件設計實現了充電電源的狀態顯示、充電時間控制、報警、過溫保護、過壓保護、過流保護等功能。本充電器真正的實現了鉛酸蓄電池的三段式充電過程，其最高輸出功率可達90 W，效率約85%，成本不到20元，具有很高的市場競爭力。 Abstract: In order to extend the life of lead-acid battery efficiently and supervise the charging process meanwhile， a 36V lead-acid battery charge powe supply controlled by microcontroller is designed. The charger is flyback switching power supply and works in CCM mode. A EM78P258N microcontroller made by ELAN microelectronics corporation is used as power management IC which is designed at the secondary circuit. The project is a successful attempt to low-cost intelligent power used microcontroller simulating power management IC. The charger also has the functions of the status reveal， charge time control， alarming， thermal protect， current limit and overvoltage protect by the software design. The circuit actually implements the three-step charge process， whose power is up to 90W and whose efficiency can get 85%. The net cost of this charger is less than 20 RMB， so that the charger is of powerful market competitiveness.

標簽： 單片機控制充電電源鉛酸蓄電池

上傳時間： 2013-11-16

上傳用戶：cepsypeng
基于AT89C2051的溫度監控系統的設計

采用單片機AT89C2051實現溫度測量與控制,鍵盤和顯示電路實現溫度的設定、修改、清零以及當前溫度值的顯示,并對溫度超過上下限進行報警。闡述了該系統設計的硬件和軟件設計。 Abstract: The system of temperature measuring and controling is realized based on AT89C2051.The keyboard and display circuit is designed,which can be used for setting and modifying temperature value,resetting and displaying the present temperature value.At the same time the warning circuit is also designed in the system,which can deal with the alarm when temperature exceeds the upper limit and the lower limit.The hardware and software design of the system are explained．

標簽： C2051 2051 89C AT

上傳時間： 2013-11-18

上傳用戶：leehom61
HT47R20A-1時基(Time Base)使用介紹

HT47R20A-1時基(Time Base)使用介紹 HT47 系列單片機的時基可提供一個周期性超時時間周期以產生規則性的內部中斷。時基的時鐘來源可由掩膜選擇設定為WDT 時鐘、RTC 時鐘或指令時鐘（系統時鐘/4）；其超時時間范圍可由掩膜選擇設定為“時鐘來源”/212~“時鐘來源”/215。如果時基發生超時現象，則其對應的中斷請求標志（TBF）會被置位，如果中斷允許，則產生一個中斷服務到08H 的地址。

標簽： Base Time HT 47

上傳時間： 2013-11-15

上傳用戶：13925096126
Backpropagation Network Time-Series Forecasting 源碼, 經典的BPN人工神經網絡例子源碼

Backpropagation Network Time-Series Forecasting 源碼, 經典的BPN人工神經網絡例子源碼

標簽： Backpropagation Forecasting Time-Series Network

上傳時間： 2015-01-05

上傳用戶：tb_6877751
Unix和NT上NetWork Time網絡協議（4.0版本）

Unix和NT上NetWork Time網絡協議（4.0版本）

標簽： NetWork Unix Time 4.0

上傳時間： 2014-01-01

上傳用戶：鳳臨西北
rtai-3.1-test3的源代碼(Real-Time Application Interface )

rtai-3.1-test3的源代碼(Real-Time Application Interface )

標簽： Application Real-Time Interface rtai

上傳時間： 2014-11-22

上傳用戶：lps11188
S3C44BOX的BIOS?？墒褂玫拿睿篽elp --- show help ? --- = help date --- show or set current date time --

S3C44BOX的BIOS?？墒褂玫拿睿篽elp --- show help ? --- = help date --- show or set current date time --- show or set current time setweek --- set weekday clock --- show system running clock setmclk --- set system running clock setbaud ------ set baud rate ipcfg ------ show or set IP address load ------ load file to ram comload ------ load file from serial port run ------ run from sdram prog ------ program flash copy ------ copy flash from src to dst address boot ------ boot from flash backup ------ move bios to the top of flash md ------ show memory data move ------ move program from flash to sdram

標簽： help date show current

上傳時間： 2015-01-22

上傳用戶：ANRAN
A Real Time Linux 一篇介紹如何在Linux這樣時間共享操作系統之上添加硬實時功能的方法。

A Real Time Linux 一篇介紹如何在Linux這樣時間共享操作系統之上添加硬實時功能的方法。

標簽： Linux Real Time 操作系統

上傳時間： 2014-01-09

上傳用戶：a6697238
Small utility which calculates the difference in hours and seconds between a starting time and finis

Small utility which calculates the difference in hours and seconds between a starting time and finish time. Useful for calculating payroll hours, overtime, etc. with C source code. Freeware.

標簽： calculates difference and starting

上傳時間： 2015-02-07

上傳用戶：jing911003