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通過對程控濾波器的理論分析，在研究MAX262的功能和單片機的SPI總線通信的基礎(chǔ)上，提出了基于MAX262的程控濾波器設(shè)計方案，設(shè)計了程控濾波器的軟硬件，并給出了測試結(jié)果。 Abstract: By analyzing the programmable filter,the paper puts forward a programmable filter system design based on MAS262 on basic of studying MAS262 features and SPI bus communication.Software and hardware of the programmmable filter are designed,and the test result is given.
標簽： MAX 262 程控 濾波器設(shè)計
上傳時間： 2013-11-15
上傳用戶：wxhwjf
對于瀝青混凝土攤鋪機自動找平控制系統(tǒng)來說，數(shù)字式控制系統(tǒng)的研制是目前的一個方向。介紹了一種基于CAN總線的數(shù)字式自動找平控制系統(tǒng)。該系統(tǒng)以CAN總線作為通信方式，PWM控制信號通過C8051F040單片機內(nèi)部PCA可編程計數(shù)器陣列產(chǎn)生，并具有結(jié)構(gòu)簡單、信號穩(wěn)定、實時性強、易擴展的特點。通過硬件實現(xiàn)和系統(tǒng)運行達到了比較理想的控制效果，驗證了系統(tǒng)的可行性。 Abstract: A digital auto-leveling control system based on CAN Bus is introduced.It uses CAN Bus as the method of communication and creates PWM signals by programmable counter array in C8051F040 microcontroller. The system is simple, stable, real-time and expansive.
標簽： CAN 總線 數(shù)字式 控制系統(tǒng)設(shè)計
上傳時間： 2013-10-09
上傳用戶：ligi201200
介紹了CAN總線和P87C591單片機的特點，給出了基于P87C591單片機的信號采集節(jié)點的軟、硬件設(shè)計，指出了硬件電路設(shè)計中應(yīng)注意的問題，在軟件設(shè)計中重點介紹了節(jié)點初始化、報文發(fā)送和報文接收等子程序。 Abstract: The features of CAN Bus and the microcontroller P87C591 are introduced, and the design of hardware circuit and soft configuration of the signals collection node based on P87C591 are presented. The problems in designing hardware circuit are discussed.Initialization subprogram, transmiting subprogram and receiving subprogram are emphasized in soft configuration.
上傳時間： 2013-11-03
上傳用戶：BIBI
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>
針對船舶氣象儀保障維修而設(shè)計的船舶氣象儀測試系統(tǒng)，包括信息處理終端、主儀器檢測模塊、傳感器檢測模塊，各個模塊都采用基于AVR單片機的嵌入式系統(tǒng)，模塊之間通過CAN總線進行通信。結(jié)果表明，船舶氣象儀測試系統(tǒng)能夠快速檢測船舶氣象儀故障，與單純依靠人工方式排查故障相比，故障檢測時間縮短了60%以上。 Abstract: The test system of ship meteorological instrument was developed to satisfy the maintenance of ship meteorological instruments，which composed of information processing terminal， testing module of main instrument and testing module of sensors. Each of these modules included an embedded system based on microcontroller of AVR series and communicated with other module by CAN bus. The results show that the test system can judge the fault of ship meteorological instrument quickly and shorten the fault detection time as much as 60% compared with simple manual troubleshooting.
標簽： AVR 單片機 氣象儀 測試系統(tǒng)
上傳時間： 2013-11-23
上傳用戶：stvnash
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.
上傳時間： 2013-11-08
上傳用戶：laozhanshi111
The SN65LBC170 and SN75LBC170 aremonolithic integrated circuits designed forbidirectional data communication on multipointbus-transmission lines. Potential applicationsinclude serial or parallel data transmission, cabledperipheral buses with twin axial, ribbon, ortwisted-pair cabling. These devices are suitablefor FAST-20 SCSI and can transmit or receivedata pulses as short as 25 ns, with skew lessthan 3 ns.These devices combine three 3-state differentialline drivers and three differential input linereceivers, all of which operate from a single 5-Vpower supply.The driver differential outputs and the receiverdifferential inputs are connected internally to formthree differential input/output (I/O) bus ports thatare designed to offer minimum loading to the buswhenever the driver is disabled or VCC = 0. Theseports feature a wide common-mode voltage rangemaking the device suitable for party-lineapplications over long cable runs.
上傳時間： 2013-10-13
上傳用戶：ytulpx
選擇了芯片后，就可以圍繞該芯片確定相應(yīng)的開發(fā)工具。開發(fā)工具的好壞往往是決定一個系統(tǒng)成敗的關(guān)鍵，下面是對CAN-BUS開發(fā)系統(tǒng)組成的一些建議：
上傳時間： 2013-11-02
上傳用戶：yueguizhilin
概述 CH341是一個USB總線的轉(zhuǎn)接芯片，通過USB 總線提供異步串口、打印口、并口以及常用的 2線和4線等同步串行接口。 在異步串口方式下，CH341提供串口發(fā)送使能、串口接收就緒等交互式的速率控制信號以及常用的MODEM聯(lián)絡(luò)信號，用于將普通的串口設(shè)備直接升級到 USB 總線。 在打印口方式下，CH341提供了兼容USB相關(guān)規(guī)范和 Windows操作系統(tǒng)的標準 USB打印口，用于將普通的并口打印機直接升級到USB總線。 在并口方式下，CH341提供了EPP方式或MEM方式及 BUS擴展方式的 8位并行接口，用于在不需要單片機/DSP/MCU 的環(huán)境下，直接輸入輸出數(shù)據(jù)。 除此之外，CH341A 芯片還支持一些常用的同步串行接口，例如 2 線接口（SCL 線、SDA 線）和 4線接口（CS線、CLK線、DIN線、DOUT線）等。
上傳時間： 2014-12-27
上傳用戶：yanyangtian
摘要：BRT(BuS Rapid Transit)這一新型的運營系統(tǒng)，在未來的城市公共交通中必然扮演重要角色。本文主要介紹基于CAN總線的鉸接裝置控制系統(tǒng)的設(shè)計。關(guān)鍵詞：客車；鉸接裝置；CAN總線；控制系統(tǒng)
上傳時間： 2013-10-18
上傳用戶：qq10538412
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