The LTM4600 DC/DC μModule regulator is a complete highpower density stepdown regulator for 10A continuous (14Apeak) loads. The device has two voltage options: 20VINmaximum for the LTM4600EV and 28VIN maximum for theLTM4600HVEV each housed in a small 15mm ¥ 15mm ¥2.8mm LGA surface mount package.
上傳時(shí)間： 2013-10-10
上傳用戶：adada
The LTM8020, LTM8021, LTM8022 and LTM8023 μModule®regulators are complete easy-to-use encapsulated stepdownDC/DC regulators intended to take the pain and aggravationout of implementing a switching power supplyonto a system board. With a μModule regulator, you onlyneed an input cap, output cap and one or two resistorsto complete the design. As one might imagine, this highlevel of integration greatly simplifi es the task of printedcircuit board design, reducing the effort to four categories:component footprint generation, component placement,routing the nets, and thermal vias.
上傳時(shí)間： 2014-01-18
上傳用戶：laomv123
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
The P89LPC912/913/914 are single-chip microcontrollers in low-cost 14-pin packages, based on a high performance processor architecture that executes instructions in two to four clocks, six times the rate of standard 80C51 devices. Many system level functions have been incorporated into the P89LPC912/913/914 in order to reduce component count, board space, and system cost.
上傳時(shí)間： 2013-10-12
上傳用戶：司令部正軍級(jí)
HIGH SPEED 8051 μC CORE - Pipe-lined Instruction Architecture; Executes 70% of Instructions in 1 or 2 System Clocks - Up to 25MIPS Throughput with 25MHz System Clock - 22 Vectored Interrupt Sources MEMORY - 4352 Bytes Internal Data RAM (256 + 4k) - 64k Bytes In-System Programmable FLASH Program Memory - External Parallel Data Memory Interface – up to 5Mbytes/sec DIGITAL PERIPHERALS - 64 Port I/O; All are 5V tolerant - Hardware SMBusTM (I2CTM Compatible), SPITM, and Two UART Serial Ports Available Concurrently - Programmable 16-bit Counter/Timer Array with 5 Capture/Compare Modules - 5 General Purpose 16-bit Counter/Timers - Dedicated Watch-Dog Timer; Bi-directional Reset CLOCK SOURCES - Internal Programmable Oscillator: 2-to-16MHz - External Oscillator: Crystal, RC, C, or Clock - Real-Time Clock Mode using Timer 3 or PCA SUPPLY VOLTAGE ........................ 2.7V to 3.6V - Typical Operating Current: 10mA @ 25MHz - Multiple Power Saving Sleep and Shutdown Modes 100-Pin TQFP (64-Pin Version Available) Temperature Range: –40°C to +85°C
標(biāo)簽： C8051F020
上傳時(shí)間： 2013-10-12
上傳用戶：lalalal
為了使音頻信號(hào)分析儀小巧可靠，成本低廉，設(shè)計(jì)了以2片MSP430F1611單片機(jī)為核心的系統(tǒng)。該系統(tǒng)將音頻信號(hào)送入八階巴特沃茲低通濾波器，對(duì)信號(hào)進(jìn)行限幅放大、衰減、電平位移、緩沖，并利用一單片機(jī)負(fù)責(zé)對(duì)前級(jí)處理后的模擬信號(hào)進(jìn)行采樣，將采集得到的音頻信號(hào)進(jìn)行4 096點(diǎn)基2的FFT計(jì)算，并對(duì)信號(hào)加窗函數(shù)提高分辨率，另一單片機(jī)負(fù)責(zé)對(duì)信號(hào)的分析及控制顯示設(shè)備。此設(shè)計(jì)精確的測(cè)量了音頻信號(hào)的功率譜、周期性、失真度指標(biāo)，達(dá)到較高的頻率分辨率，并能將測(cè)量結(jié)果通過紅外遙控器顯示在液晶屏上。 Abstract: o make the audio signal analyzer cheaper， smaller and more reliable， this system sends the audio signal to the eight-order butterworth filter， and then amplifies， attenuates， buffers it in a limiting range， transfers the voltage level of the signal before utilizing two MSP430F1611 MCU to realize the audio analysis. One is charged for sampling and dealing with the processed audio signal collected by the 4096 point radix-2 FFT calculation and imposes the window function to improve the frequency resolution. The other one controls the display and realizes the spectrum， periodicity， power distortion analysis in high resolution which is displayed in the LCD screen through the infrared remote control.
上傳時(shí)間： 2013-12-11
上傳用戶：jasonheung
為解決當(dāng)前計(jì)算機(jī)串行通訊接口只有USB，難以滿足舊型號(hào)設(shè)備或某些單片機(jī)要求RS232通訊的問題，設(shè)計(jì)出兩款RS232/USB電路。采用CH341A與MAX223集成電路芯片構(gòu)建標(biāo)準(zhǔn)9線RS232/USB通用接口轉(zhuǎn)換器，無需編程。采用CH341A與PIC16F877A構(gòu)建單片機(jī)與計(jì)算機(jī)之間的USB通訊電路，軟件遵循RS232通訊協(xié)議，硬件進(jìn)行電平轉(zhuǎn)換。實(shí)際使用表明，這兩款產(chǎn)品與計(jì)算機(jī)端Windows 操作系統(tǒng)下的串口應(yīng)用程序完全兼容，且通訊過程中無握手失敗現(xiàn)象。 Abstract: To solve the problem that current computer serial communication only with USB interface can not satisfy with the old type equipments or MCU to communicate with RS232， two kinds of RS232/USB circuit were designed.CH341A and MAX223 integrated circuit chips were used to create a standard 9-line RS232/USB universal interface convertor without programme. CH341A and PIC16F877A chips were adopted to build the USB communication circuit between computers and MCU. The software follows RS232 communication protocol， and the hardware converts electrical levels. Actual practices indicate that the two manufactures are compatible with serial application program of Windows operation system completely，and get avoid of handshake lost.
上傳時(shí)間： 2013-11-03
上傳用戶：siying
以太網(wǎng)和CAN總線應(yīng)用廣泛，但由于其通信協(xié)議不同，兩種總線器件間無法進(jìn)行數(shù)據(jù)通信，因此，設(shè)計(jì)了基于CP2200與C8051F040的以太網(wǎng)總線與CAN總線接口轉(zhuǎn)換電路，并給出部分相關(guān)硬件電路與軟件設(shè)計(jì)分析。在保證數(shù)據(jù)完整和協(xié)議可靠的前提下，通過握手協(xié)議和簡(jiǎn)化的以太網(wǎng)協(xié)議，不僅實(shí)現(xiàn)了以太網(wǎng)數(shù)據(jù)與CAN數(shù)據(jù)的轉(zhuǎn)發(fā)，同時(shí)還順利的解決了以太網(wǎng)的高速性與CAN的低速率沖突，以及兩者數(shù)據(jù)包之間的大小不同的矛盾。 Abstract: In the development of actual application， Ethernet and CAN bus are used very extensively. Owing to its various communication protocols， the communicating between two kinds of bus device can’t be carried out. Therefore， in order to solve this problem， the Ethernet-CAN bus interface circuit based on CP2200 and C8051F040 was designed in this paper， and part of the related hardware circuit and software design analysis were given. On the condition of data’s integrity and protocols’reliability， through the handshaking protocols and the simplified the Ethernet protocol， not only the data switching between CAN and Ethernet was realized， but also the differ in velocity and packet size was solved.
標(biāo)簽： C8051F040 CAN 以太網(wǎng) 轉(zhuǎn)換
上傳時(shí)間： 2013-10-15
上傳用戶：Ants
提出一種基于凌陽(yáng)單片機(jī)的步進(jìn)電機(jī)加減速的控制方法。采用凌陽(yáng)科技推出的16位結(jié)構(gòu)工控單片機(jī)SPMC75F2413A為控制器，由Allegro公司生產(chǎn)的兩相步進(jìn)電機(jī)專用驅(qū)動(dòng)器件SLA7042M構(gòu)成步進(jìn)電機(jī)的驅(qū)動(dòng)電路，在傳統(tǒng)的3段直線加減速控制算法基礎(chǔ)上增加至7段S形曲線加減速過程，控制步進(jìn)電機(jī)的啟動(dòng)和停止。實(shí)驗(yàn)結(jié)果表明，該控制方法克服了直線加減速中不連續(xù)、易造成系統(tǒng)沖擊的問題，整個(gè)系統(tǒng)實(shí)現(xiàn)柔性控制，電機(jī)啟動(dòng)、停止連續(xù)性能提高30%。 Abstract: The method of controlled stepping motor is referred based on SPMC75F2413A MCU， which adopts the 16 knots SPMC75F2413A MCU as the controller. The special-purpose actuation chip SLA7042M of two stepping motor produced by Allegro Corporation constituted to actuation electric circuit. The purpose of increasing to seven section of S shape curve based on the traditional three sections of straight line is to control the start and stop process of stepping motor. The experimental results show that the control method solves easy to pull-out and overshot problems. The overall system realizes flexible control， and the performance of motor start or stop continuity is increased 30%
標(biāo)簽： 凌陽(yáng)單片機(jī) 步進(jìn)電機(jī) 減 控制方法
上傳時(shí)間： 2013-12-08
上傳用戶：jiangfire
介紹一種基于C8051單片機(jī)的動(dòng)態(tài)心電監(jiān)護(hù)系統(tǒng)。該系統(tǒng)由兩部分組成：以C8051F320單片機(jī)為核心的數(shù)據(jù)采集裝置和以PC機(jī)為平臺(tái)的分析處理系統(tǒng)。硬件電路功耗低，由單片機(jī)自帶的USB接口將數(shù)據(jù)傳送給PC機(jī)。軟件平臺(tái)采用LabVIEW可視化虛擬儀器系統(tǒng)開發(fā)平臺(tái)，將傳統(tǒng)儀器的功能模塊集成到計(jì)算機(jī)中，用戶可通過修改虛擬儀器的程序改變其功能。采用USB接口實(shí)時(shí)傳輸心電數(shù)據(jù)，并將數(shù)據(jù)采集模塊設(shè)計(jì)為計(jì)算機(jī)外設(shè)，使該系統(tǒng)高速快捷、小巧便攜。 Abstract: In this design，a low-cost ECG electrocardiogram monitoring system is introduced，which consists of two parts:data acquisition device based on C8051F320and PC terminal as the analysis and processing system.The system is low-power consumption，the data is transmitted to the PC terminal by USB interface of the C8051F320.By using the visible virtual instrument system developing platform LabVIEW，the traditional instruments function modules are integrated into the computer，so the user can modify virtual instrument software to change its function to meet their needs.Using USB in-terface to realize real-time ECG data transmission，in addition，ECG data acquisition module is designed as the computer peripheral，which makes the syetem high-speed and portable.
標(biāo)簽： C8051F320 心電監(jiān)護(hù) 系統(tǒng)設(shè)計(jì)
上傳時(shí)間： 2013-11-13
上傳用戶：zhangzhenyu
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