Handheld electronic devices play a key role in our everydaylives. Because dependability is paramount, handhelds arecarefully engineered with lightweight power sources forreliable use under normal conditions. But no amount ofcareful engineering can prevent the mistreatment theywill undergo at the hands of humans. For example, whathappens when a factory worker drops a bar code scanner,causing the battery to pop out? Such events areelectronically unpredictable, and important data storedin volatile memory would be lost without some form ofsafety net—namely a short-term power holdup systemthat stores suffi cient energy to supply standby power untilthe battery can be replaced or the data can be stored inpermanent memory.
標(biāo)簽： 超級電容器 備用電源 手持設(shè)備
上傳時(shí)間： 2013-11-05
上傳用戶：coeus
Abstract: In battery-powered RF transmitters such as garage door openers and remote keyless entry for cars, as the battery drains,
標(biāo)簽： SM發(fā)射機(jī) 電源電壓 發(fā)射功率
上傳時(shí)間： 2013-10-23
上傳用戶：nanxia
連接器通常被分為兩大類，即信號類和電源類。兩類之間的主要區(qū)別在于工作電流和電壓。 一般來說，信號連接器觸點(diǎn)傳輸?shù)碾娏魃儆?安培，且在低到中 等電壓下工作。電源類觸點(diǎn)傳輸較高的電流（> 1安培） ，且在中高電壓下工 作。電源連接器可制成不同的級別，從IC插座到電纜連接系統(tǒng)。用于測評連接 器在其使用壽命中的穩(wěn)定性的關(guān)鍵度量是連接器的接觸電阻。接觸電阻是體電阻(Rbulk)、膜電阻(Rf)和緊縮電阻的組合，并存在于電路中使用可分離界面時(shí)。
標(biāo)簽： Wellman Brush 電源連接器 可靠性
上傳時(shí)間： 2013-11-02
上傳用戶：梧桐
吉時(shí)利強(qiáng)大的開關(guān)系統(tǒng)使得為任何應(yīng)用配置最優(yōu)化的解決方案變得簡單，可以提供標(biāo)準(zhǔn)的或者定制化的解決方案。無論應(yīng)用需要開關(guān)矩陣或者多路復(fù)用器，或者設(shè)計(jì)常規(guī)的DC、RF、微波、光電或者數(shù)字I/O信號等，吉時(shí)利都為您提供高性能、低成本的各種解決方案。
上傳時(shí)間： 2013-11-02
上傳用戶：范縝東苑
Demonstration circuit 1562A is an engineering toolto design and evaluate the LTC699X-X family ofTimerBlox circuits. The center section of the boardcontains a pre-configured TimerBlox function.DC1562A comes in twelve timing function variationsas outlined in Table 1.Surrounding the center board is a ”playground”prototyping area. The prototyping area has padsfor Dip-8, S8, MS8, or S6 packages with breadboarding connections to each pin and two convenientpower buses and ground bus surrounding theentire area. This area is for conditioning signals tocontrol the timer function and for adding loads controlled in time.
標(biāo)簽： 6994 LTC PCB 參考設(shè)計(jì)
上傳時(shí)間： 2013-10-18
上傳用戶：如果你也聽說
利用51單片機(jī)、430單片機(jī)、RF射頻模塊設(shè)計(jì)。。自己的PC機(jī)音樂遙控器
標(biāo)簽： LaunchPad MSP 430 USB
上傳時(shí)間： 2013-10-30
上傳用戶：change0329
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.
上傳時(shí)間： 2013-11-17
上傳用戶：3294322651
Designing read/write device (RWD) units for industrial RF-Identification applications is strongly facilitated by the NXP Semiconductors HITAG Reader Chip HTRC110. All needed function blocks, like the antenna driver, modulator demodulator and antenna diagnosis unit, are integrated in the HTRC110. Therefore only a minimum number of additional passive components are required for a complete RWD. This Application Note describes how to design an industrial RF-Identification system with the HTRC110. The major focus is dimensioning of the antenna, all other external components including clock and power supply, as well as the demodulation principle and its implementatio
上傳時(shí)間： 2013-10-22
上傳用戶：zhengjian
設(shè)計(jì)一種基于AT89C52的語音錄放系統(tǒng)，利用單片機(jī)、ISD2560語音錄放器件、麥克風(fēng)、揚(yáng)聲器等元器件實(shí)現(xiàn)硬件電路的設(shè)計(jì)，并利用C51高級語言設(shè)計(jì)ISD2560器件控制字的寫入和定時(shí)中斷程序。經(jīng)軟硬件調(diào)試，結(jié)果表明該系統(tǒng)錄放效果良好，具有一定的工程實(shí)用價(jià)值。 Abstract: Voice recording and playback system based on AT89C52is designed in this paper.Using the single-chip microcomputer，voice recording and playback chip ISD2560，microphone and speaker to realize the hardware circuit design.Writing ISD2560control words and timing interrupt procedures are designed by C51advanced language.Through the hardware and software test,voice recording and playback system play better voice,and this system has some engineering practical values.
上傳時(shí)間： 2013-10-20
上傳用戶：ywcftc277
詳細(xì)介紹了TLC1549系列模數(shù)轉(zhuǎn)換器的特點(diǎn)及工作原理，然后根據(jù)TLC1549的工作時(shí)序和A/D轉(zhuǎn)換原理針對實(shí)際問題編寫了詳細(xì)的匯編語言程序。 Abstract: A basic principle and characteristic of TLC1549 analog-to-digital converter are introduced? detailedly in this article.Through engineering-oriented illustration,a microcomputer programmer base on basic principle and time sequence of TLC1549 is writted.
上傳時(shí)間： 2014-07-16
上傳用戶：blans
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