介紹了采用ATmega48單片機(jī)實現(xiàn)三相無刷直流電機(jī)控制器的方法。利用Atmega48獲得帶死區(qū)的脈寬調(diào)制（PWM）、霍爾傳感器的換相處理、正弦驅(qū)動信號的產(chǎn)生和電機(jī)轉(zhuǎn)速的控制等功能。采用該方法的優(yōu)點是所需的外圍器件少，成本低。 Abstract: The method of 3-phase brushless DC motor control based on ATmega48 is presented in this paper.The system uses ATmega48 to generate PWM signals with dead-time, hall sensors signals commutation，sine driving signal and rotational speed of motor.Using this method，the needed external devices are few, the cost is low.
標(biāo)簽： ATmega 48 無刷電機(jī) 控制方法
上傳時間： 2013-12-09
上傳用戶：330402686
在汽車發(fā)動機(jī)起動時，若發(fā)動機(jī)起動后起動機(jī)不能及時斷電，將會燒毀起動機(jī)或損壞飛輪齒環(huán)；若變速器不在空檔位置起動，則起動機(jī)的瞬間動力將使汽車位移，還可能引起交通事故和人身安全。為此介紹一種利用NXP P89LPC901單片機(jī)控制的汽車起動保護(hù)控制器，通過檢測汽車起動開關(guān)、變速箱檔位、發(fā)動機(jī)轉(zhuǎn)速，實現(xiàn)對汽車發(fā)動機(jī)起動過程檢測和保護(hù)。起動保護(hù)控制器在發(fā)動機(jī)起動過程中通過采用逐個關(guān)閉打開負(fù)載系統(tǒng)，解決汽車發(fā)動機(jī)過程中因起動電流大而對汽車電源的沖擊影響,延長了電瓶壽命。 Abstract: When the automotive engine is started, the engine start motor and flywheel gear may be damaged， even traffic accidents and personal safeties may be caused by wrong operation or other factors.In order to ensure the automotive engine can be started normally and safely,it is necessary that the protecting measures and methods are considered in the automotive electrical control system.This paper introduces a kind of the automotive engine starting protect controller based on NXP P89LPC901 MCU.The controller can protect the engine starting process by detecting the starter key switch,transmission stall and engine speed.Through the use of close and open load system,the controller can solve the impact on automotive power because of the high-current load in the process of the automobile engine starting, and extend battery life.
上傳時間： 2013-10-15
上傳用戶：mikesering
以AVR單片機(jī)ATmega8和USB接口器件PDIUSBD12為核心，基于標(biāo)準(zhǔn)的USB1.1協(xié)議，設(shè)計一種通用USB接口模塊，以滿足嵌入式系統(tǒng)中對USB接口的需求。對模塊的硬件電路或單片機(jī)固件程序的硬件接口層稍加修改即可用于其他各種微處理器。該模塊可為各種嵌入式系統(tǒng)增加USB接口,實現(xiàn)與USB主機(jī)系統(tǒng)通信。 Abstract: Based on AVR microcontroller ATmega8 and USB interface chip PDIUSBD12, a general USB interface module is designed according to USB1.1 protocol for various requirements of embedded systems. Only with few modifications in circuit or hardware abstract layer of firmware, the module can be used on many types of microprocessors. All kinds of embedded systems can realize high speed and stable communication with USB host systems, owing to the facility of this module.
標(biāo)簽： AVR USB 單片機(jī) 接口設(shè)計
上傳時間： 2014-01-08
上傳用戶：趙云興
主要介紹構(gòu)成記憶示波器的STC12C5408AD增強(qiáng)型單片機(jī)8通道10位模數(shù)轉(zhuǎn)換功能的設(shè)置、應(yīng)用和具體的匯編程序設(shè)計，以及PC機(jī)串行通訊和圖形顯示的高速匯編程序的設(shè)計要點，并列舉實例說明其應(yīng)用效果。 Abstract: The configuration, applications and the designs for? compiling program of the memorial oscillograph of 10 bits A/D conversation are introduced. It’s bases on STC12C5408AD 8? channels? single-chip? computer? in? enhancement? mode. It also recommends the devising essentials of high speed compiling program for PC serial communication and graphics display, lists examples to explain its effects in using.
上傳時間： 2013-10-10
上傳用戶：adada
基于幅移鍵控技術(shù)ASK（Amplitude-Shift Keying），以C8051F340單片機(jī)作為監(jiān)測終端控制器，C8051F330D單片機(jī)作為探測節(jié)點控制器，采用半雙工的通信方式，通過監(jiān)控終端和探測節(jié)點的無線收發(fā)電路，實現(xiàn)數(shù)據(jù)的雙向無線傳輸。收發(fā)電路采用直徑為0.8 mm的漆包線自行繞制成圓形空心線圈天線，天線直徑為（3.4±0.3）cm。試驗表明，探測節(jié)點與監(jiān)測終端的通信距離為24 cm，通過橋接方式，節(jié)點收發(fā)功率為102 mW時，節(jié)點間的通信距離可達(dá)20 cm。與傳統(tǒng)無線收發(fā)模塊相比，該無線收發(fā)電路在受體積、功耗、成本限制的場合有廣闊的應(yīng)用前景。 Abstract: Based on ASK technology and with the C8051F340 and C8051F330D MCU as the controller， using half-duplex communication mode， this paper achieves bi-directional data transfer. Transceiver circuit constituted by enameled wire which diameter is 0.8mm and wound into a diameter （3.4±0.3） cm circular hollow coil antenna. Tests show that the communication distance between detection and monitoring of the terminal is 24cm，the distance is up to 20cm between two nodes when using the manner of bridging and the node transceiver power is 102mW. Compared with the conventional wireless transceiver modules， the circuit has wide application prospect in small size， low cost and low power consumption and other characteristics.
標(biāo)簽： C8051F 單片機(jī) 無線收發(fā) 電路設(shè)計
上傳時間： 2013-10-19
上傳用戶：xz85592677
The PCF8578 is a low power CMOS1 LCD row and column driver, designed to drive dotmatrix graphic displays at multiplex rates of 1:8, 1:16, 1:24 or 1:32. The device has40 outputs, of which 24 are programmable and configurable for the following ratios ofrows/columns: 32¤8, 24¤16, 16¤24 or 8¤32. The PCF8578 can function as a stand-alone LCDcontroller and driver for use in small systems. For larger systems it can be used inconjunction with up to 32 PCF8579s for which it has been optimized. Together these twodevices form a general purpose LCD dot matrix driver chip set, capable of driving displaysof up to 40960 dots. The PCF8578 is compatible with most microcontrollers andcommunicates via a two-line bidirectional bus (I2C-bus). Communication overhead isminimized by a display RAM with auto-incremented addressing and display bankswitching.
上傳時間： 2013-10-23
上傳用戶：頂?shù)弥?/p>
1 FEATURES· Single chip LCD controller/driver· 1 or 2-line display of up to 24 characters per line, or2 or 4 lines of up to 12 characters per line· 5 ′ 7 character format plus cursor; 5 ′ 8 for kana(Japanese syllabary) and user defined symbols· On-chip:– generation of LCD supply voltage (external supplyalso possible)– generation of intermediate LCD bias voltages– oscillator requires no external components (externalclock also possible)· Display data RAM: 80 characters· Character generator ROM: 240 characters· Character generator RAM: 16 characters· 4 or 8-bit parallel bus or 2-wire I2C-bus interface· CMOS/TTL compatible· 32 row, 60 column outputs· MUX rates 1 : 32 and 1 : 16· Uses common 11 code instruction set· Logic supply voltage range, VDD - VSS: 2.5 to 6 V· Display supply voltage range, VDD - VLCD: 3.5 to 9 V· Low power consumption· I2C-bus address: 011101 SA0.
標(biāo)簽： 2116 PCF LCD 驅(qū)動器芯片
上傳時間： 2013-11-08
上傳用戶：laozhanshi111
針對當(dāng)前安檢力學(xué)試驗機(jī)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(jī)為核心控制器的安檢力學(xué)試驗機(jī)的設(shè)計。詳細(xì)闡述了該安檢力學(xué)試驗機(jī)各個組成部分的設(shè)計原理和方案，并且給出了各部分的軟件設(shè)計思想和操作流程。經(jīng)過大量測試試驗表明：設(shè)計的安檢力學(xué)試驗機(jī)可以完成多達(dá)十余種的力學(xué)安檢試驗，完全符合相關(guān)國家標(biāo)準(zhǔn)，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(shè)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(biāo)簽： ATmega 128 安檢 試驗機(jī)
上傳時間： 2013-11-05
上傳用戶：a67818601
The CAT93C46 is a 1 kb Serial EEPROM memory device which isconfigured as either 64 registers of 16 bits (ORG pin at VCC) or 128registers of 8 bits (ORG pin at GND). Each register can be written (orread) serially by using the DI (or DO) pin. The CAT93C46 features aself−timed internal write with auto−clear. On−chip Power−On Resetcircuit protects the internal logic against powering up in the wrongstate.
上傳時間： 2013-11-20
上傳用戶：ynzfm
FEATURES400 MSPS internal clock speedIntegrated 10-bit DAC32-bit tuning wordPhase noise ≤ –120 dBc/Hz @ 1 kHz offset (DAC output)Excellent dynamic performance>75 dB SFDR @ 160 MHz (±100 kHz offset) AOUTSerial I/O control1.8 V power supplySoftware and hardware controlled power-down48-lead TQFP/EP packageSupport for 5 V input levels on most digital inputsPLL REFCLK multiplier (4× to 20×)Internal oscillator; can be driven by a single crystalPhase modulation capabilityMultichip synchronization
上傳時間： 2014-12-04
上傳用戶：axin881314
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