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  • 運用LT3092電流源以高線性度來實現溫度至電流轉換

      One of the fi rst lessons in a basic electronics coursecovers the symbols for resistors, capacitors, inductors,voltage sources and current sources. Althougheach symbol represents a functional component of areal-world circuit, only some of the symbols have directphysical counterparts. For instance, the three discretepassive devices—resistors, capacitors, inductors—canbe picked off a shelf and placed on a real board muchas their symbolic analogs appear in a basic schematic.Likewise, while voltage sources have no direct 2-terminalanalog, a voltage source can be easily built with an offthe-shelf linear regulator.

    標簽: 3092 LT 電流源 溫度

    上傳時間: 2013-11-24

    上傳用戶:simonpeng

  • 一個100MHz的RMS DC轉換集成電路

    AN22 details the theoretical and application aspects of the LT1088 thermal RMS/DC converter. The basic theory behind thermal RMS/DC conversion is discussed and design details of the LT1088 are presented. Circuitry for RMS/DC converters, wideband input buffers and heater protection is shown.

    標簽: 100 MHz RMS 轉換

    上傳時間: 2013-10-16

    上傳用戶:china97wan

  • Wide-input dc/dc modules offer

    When a system designer specifies a nonisolated dc/dc powermodule, considering the needed input voltage range isequally as important as considering the required performanceattributes and features. Generally, nonisolated moduleshave either a narrow or a wide input voltage range. Narrowinputmodules typically have a nominal input voltage of3.3, 5, or 12 V. For systems that operate from a tightlyregulated input bus—such as those that do not use batterybackup—a narrow-input module is often adequate sincethe input remains fairly stable.Offering greater flexibility, wide-input modules operatewithin a range of 7 to 36 V, which includes the popular12- or 24-V industrial bus. This enables a single module tobe used for generating multiple voltages. These modulesare ideal for industrial controls, HVAC systems, vehicles,medical instrumentation, and other applications that usea loosely regulated distribution bus. In addition, systemspowered by a rectifier/battery charger with lead-acidbattery backup almost always require wide-input modules.System designers who choose power supplies may wantto take a close look at the latest generation of wide-inputdc/dc modules.

    標簽: Wide-input modules offer dc

    上傳時間: 2014-12-24

    上傳用戶:dragonhaixm

  • LTC6994參考設計及PCB布線規則

    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.

    標簽: 6994 LTC PCB 參考設計

    上傳時間: 2013-10-18

    上傳用戶:如果你也聽說

  • 80C51特殊功能寄存器地址表

    /*--------- 8051內核特殊功能寄存器 -------------*/ sfr ACC = 0xE0;             //累加器 sfr B = 0xF0;  //B 寄存器 sfr PSW    = 0xD0;           //程序狀態字寄存器 sbit CY    = PSW^7;       //進位標志位 sbit AC    = PSW^6;        //輔助進位標志位 sbit F0    = PSW^5;        //用戶標志位0 sbit RS1   = PSW^4;        //工作寄存器組選擇控制位 sbit RS0   = PSW^3;        //工作寄存器組選擇控制位 sbit OV    = PSW^2;        //溢出標志位 sbit F1    = PSW^1;        //用戶標志位1 sbit P     = PSW^0;        //奇偶標志位 sfr SP    = 0x81;            //堆棧指針寄存器 sfr DPL  = 0x82;            //數據指針0低字節 sfr DPH  = 0x83;            //數據指針0高字節 /*------------ 系統管理特殊功能寄存器 -------------*/ sfr PCON  = 0x87;           //電源控制寄存器 sfr AUXR = 0x8E;              //輔助寄存器 sfr AUXR1 = 0xA2;             //輔助寄存器1 sfr WAKE_CLKO = 0x8F;        //時鐘輸出和喚醒控制寄存器 sfr CLK_DIV  = 0x97;          //時鐘分頻控制寄存器 sfr BUS_SPEED = 0xA1;        //總線速度控制寄存器 /*----------- 中斷控制特殊功能寄存器 --------------*/ sfr IE     = 0xA8;           //中斷允許寄存器 sbit EA    = IE^7;  //總中斷允許位  sbit ELVD  = IE^6;           //低電壓檢測中斷控制位 8051

    標簽: 80C51 特殊功能寄存器 地址

    上傳時間: 2013-10-30

    上傳用戶:yxgi5

  • TLC2543 中文資料

    TLC2543是TI公司的12位串行模數轉換器,使用開關電容逐次逼近技術完成A/D轉換過程。由于是串行輸入結構,能夠節省51系列單片機I/O資源;且價格適中,分辨率較高,因此在儀器儀表中有較為廣泛的應用。 TLC2543的特點 (1)12位分辯率A/D轉換器; (2)在工作溫度范圍內10μs轉換時間; (3)11個模擬輸入通道; (4)3路內置自測試方式; (5)采樣率為66kbps; (6)線性誤差±1LSBmax; (7)有轉換結束輸出EOC; (8)具有單、雙極性輸出; (9)可編程的MSB或LSB前導; (10)可編程輸出數據長度。 TLC2543的引腳排列及說明    TLC2543有兩種封裝形式:DB、DW或N封裝以及FN封裝,這兩種封裝的引腳排列如圖1,引腳說明見表1 TLC2543電路圖和程序欣賞 #include<reg52.h> #include<intrins.h> #define uchar unsigned char #define uint unsigned int sbit clock=P1^0; sbit d_in=P1^1; sbit d_out=P1^2; sbit _cs=P1^3; uchar a1,b1,c1,d1; float sum,sum1; double  sum_final1; double  sum_final; uchar duan[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; uchar wei[]={0xf7,0xfb,0xfd,0xfe};  void delay(unsigned char b)   //50us {           unsigned char a;           for(;b>0;b--)                     for(a=22;a>0;a--); }  void display(uchar a,uchar b,uchar c,uchar d) {    P0=duan[a]|0x80;    P2=wei[0];    delay(5);    P2=0xff;    P0=duan[b];    P2=wei[1];    delay(5);   P2=0xff;   P0=duan[c];   P2=wei[2];   delay(5);   P2=0xff;   P0=duan[d];   P2=wei[3];   delay(5);   P2=0xff;   } uint read(uchar port) {   uchar  i,al=0,ah=0;   unsigned long ad;   clock=0;   _cs=0;   port<<=4;   for(i=0;i<4;i++)  {    d_in=port&0x80;    clock=1;    clock=0;    port<<=1;  }   d_in=0;   for(i=0;i<8;i++)  {    clock=1;    clock=0;  }   _cs=1;   delay(5);   _cs=0;   for(i=0;i<4;i++)  {    clock=1;    ah<<=1;    if(d_out)ah|=0x01;    clock=0; }   for(i=0;i<8;i++)  {    clock=1;    al<<=1;    if(d_out) al|=0x01;    clock=0;  }   _cs=1;   ad=(uint)ah;   ad<<=8;   ad|=al;   return(ad); }  void main()  {   uchar j;   sum=0;sum1=0;   sum_final=0;   sum_final1=0;    while(1)  {              for(j=0;j<128;j++)          {             sum1+=read(1);             display(a1,b1,c1,d1);           }            sum=sum1/128;            sum1=0;            sum_final1=(sum/4095)*5;            sum_final=sum_final1*1000;            a1=(int)sum_final/1000;            b1=(int)sum_final%1000/100;            c1=(int)sum_final%1000%100/10;            d1=(int)sum_final%10;            display(a1,b1,c1,d1);           }         } 

    標簽: 2543 TLC

    上傳時間: 2013-11-19

    上傳用戶:shen1230

  • AVR單片機數碼管秒表顯示

    #include<iom16v.h> #include<macros.h> #define uint unsigned int #define uchar unsigned char uint a,b,c,d=0; void delay(c) { for for(a=0;a<c;a++) for(b=0;b<12;b++); }; uchar tab[]={ 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,

    標簽: AVR 單片機 數碼管

    上傳時間: 2013-10-21

    上傳用戶:13788529953

  • 基于8098單片機的SPWM變頻調速系統

      數字控制的交流調速系統所選用的微處理器、功率器件及產生PWM波的方法是影響交流調速系統性能好壞的直接因素。在介紹了正弦脈寬調制(SPWM)技術的基礎上,設計了一種以8098單片機作為控制器,以智能功率模塊IPM為開關器件的變頻調速系統。通過軟件編程,產生正弦脈沖寬度調制波形來控制絕緣柵雙極晶體管的導通和關斷,從而達到控制異步電動機轉速的目的。實驗結果表明,該系統可調頻率調電壓,穩定度高,調速范圍寬,具有較強的實用價值   Abstract:   AC variable speed with digital control systems used microprocessors, power devices and generate PWM wave is the direct factors of affecting the performance AC speed regulation system. On the basis of introducing the sinusoidal pulse width modulation (SPWM) technology,this paper designed variable speed system which used 8098 as a controller, intelligent power module IPM as switching device. Through software programming, resulting in sinusoidal pulse width modulation waveform to control the insulated gate bipolar transistor turn on and off, so as to achieve the purpose of speed control of induction motors. Experimental results show that the system can adjust frequency modulation voltage, high stability, wide speed range, has a strong practical value.  

    標簽: 8098 SPWM 單片機 變頻調速系統

    上傳時間: 2013-11-14

    上傳用戶:ynwbosss

  • 基于AVR單片機的閉環控制系統

      針對科研實驗中對拉壓千斤頂加載過程控制的需要,采用ATmega128單片機控制步進電機進而實現對執行系統的電動泵站實行自動控制。對力和位移的數據采集與處理及用步進電機控制電動泵站手柄的技術細節作了重點描述。通過單片機的A/D變換器對AMP放大模塊采集的電橋信號作量化處理,千斤頂的操控手柄位置依電動油泵閥門開啟的方向和大小作若干定位,單片機根據力或位移傳感器信號,實時控制步進電機驅動手柄旋轉到相應操控位置。   Abstract:   This article describes the use of ATmega128 AVR microcontroller series of DBS electric pumping stations and QF100/200 separate twoway hydraulic jack to automate the process of manipulating the work of the technical content. Articles on force and displacement data acquisition and processing, and stepper motor control electric pump with the handle of the key technical details were described. Through the MCU’s A / D converter module is collected on the AMP amplification quantify the signal bridge, jack handle position control valve opening according to the direction of electric pumps for a number of positioning and size of the microcontroller based on force or displacement sensor signals, real-time control stepper motor drive control handle rotate to the appropriate location.  

    標簽: AVR 單片機 閉環控制

    上傳時間: 2014-01-16

    上傳用戶:hasan2015

  • 基于單片機的顏色自適應識別電路

      為解決電致變色器件的顏色變化受外界環境顏色控制的問題,設計了一種基于單片機的便攜式顏色自適應識別電路。與傳統顏色識別電路相比較,該電路利用數字式的顏色傳感器來獲取外界環境顏色,產生的數字顏色信號易于單片機進行處理。在電路中,下位機部分主要負責獲取電致變色器件變色參數及控制電致變色器件的顏色變化;而上位機部分主要負責把下位機獲取的電致變色器件變色參數進行電壓到顏色的曲線擬合,并通過藍牙通信把擬合曲線參數傳遞給下位機。結果表明,該電路能自動根據環境顏色提供-4~4 V范圍步進為0.1 V的電壓來驅動電致變色器件的顏色顯示,與傳統的顏色識別電路設計相比,識別的精度和速度都得到了明顯改善。   Abstract:   In this paper, a portable adaptive circuit for color identification(PACCI) based on MCU was designed. Compared to the traditional color identification circuit, the PACCI adopts digital sensor to detect the color data from external environment and further generate digital color data, which can be processed easily by MCU. In PACCI, the slave is mainly responsible for detecting the color parameters of the corresponding elcreochromic device and further driving it. For the master, which is mainly responsible for the color curve fitting based on the parameters of the electrochromic device, and transmits the fitting parameters to the slave through the bluetooth device. The results show that the PACCI can provide the basis voltage range from -4V to 4V automatically based on the colors of external environment with step as 0.1V to drive the corresponding electrochromic device. Compared to the traditional color recognition circuit, the recognition accuracy and speed of PACCI have been improved significantly.

    標簽: 單片機 識別電路

    上傳時間: 2013-11-09

    上傳用戶:franktu

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