硬件电路设计之主芯片选型 平台的选择很多时候和系统选择的算法是相关的,所以如果要提高架构,平台的设计能力,得不断提高自身的算法设计,复杂度评估能力,带宽分析能力。 常用的主处理器芯片有:单片机,ASIC,RISC(DEC Alpha、ARC、ARM、MIPS、PowerPC、SPARC和SuperH ),DSP和FPGA等,这些处理器的比较在网上有很多的文章,在这里不老生常谈了,这里只提1个典型的主处理器选型案例
上传时间: 2013-11-05
上传用户:HGH77P99
为提高温度测量效率,降低系统的成本,扩展传输距离,设计出一种新型温度采集系统。单片机通过控制具有单总线方式的温度传感器DS18B20实现对温度的测量,同时单片机通过控制具有单总线方式300~450MHz频率范围内的MAX7044与MAX7033无线发射与接收芯片实现温度数据的无线传输。与传统温度采集系统相比,该系统利用单总线方式连接,采用无线传输方式实现远距离通信,易于系统的集成与扩展。实验结果表明,该系统结构简单、方便移植,能够同时实现多达上百点温度的测量与500m范围的传输。 Abstract: To improve the temperature measurement efficiency and reduce system cost,expansion of transmission distance,a new type of temperature acquisition system is designed.Microcontroller controlled temperature sensor DS18B20which has a single-bus achieves temperature measurement,while microcontroller by controlled the MAX7044and MAX7033chip with a single-bus and having300~450MHz radiofrequency to achieve the wireless transmission of temperature data.Compared with conventional temperature acquisition system,the system uses single-bus connected,and uses wireless transmission means to achieve long-distance communications,easy-to-system integration and expansion.The experimental results show that the system is simple,convenient transplantation,and can be implemented in as many as a hundred-point temperature measure-ment and the transmission range of500meters.
上传时间: 2013-10-29
上传用户:515414293
设计一种基于P89V51RD2的功率因数测量仪,采用光电隔离器和专用数码管驱动器。该测量仪是以增强型单片机P89V51RD2为核心,大大简化系统硬件设计。而软件部分采用模块化设计思想,采用中值滤波和小数补偿算法,实现功率因数的高精度测量。实验测试表明,该功率因数测量仪测量精度高,运行稳定可靠。 Abstract: A power-factor measurement instrument based on P89V51RD2is designed,which uses optical coupler and specific LED drive chip.The power factor measurement instrument uses P89V51RD2as a core of which greatly simplifies the system design.Furthermore,modularization software is developed in detail.The high precision power-factor measuring system is realized by the center value filter and fractional compensation algorithm.Experiments manifests that the power- factor measurement instrument is high precision,steady and reliable.
上传时间: 2014-12-27
上传用户:CHINA526
介绍了一种基于C8051F020单片机的多路压力测量仪。该测量仪选用电阻应变式压力传感器采集压力信号,并经放大电路处理后送入C8051F020单片机,再由C8051F020单片机内部的A/D转换器将采集到的压力信号进行模数转化,然后分别对数据进行存储和显示。该测量仪能测量6路压力信号,并且各测量点都能单独检测和设置。由于采用了C8051F020单片机,简化了硬件电路,增强了抗干扰能力,使得测量仪具有测量精度高,冲击小等特点。 Abstract: A measurement apparatus for multi-channel pressure based on single chip microcomputer is introduced.It can measure 6 channels signal of the pressure,and the pressure measure points can be detection and located individually.The pressure signal sampling is obtained by resistor stress-type pressure sensors,the digital signals of 6 channels are collected through amplifying and adjustment circuit of pressure signals and internal integrated A/D converter of MCU.Finally,and it realizes the function to store and display data separately.C8051F020 was used to made hardware circuit simple,and it also enhanced the anti-interference ability.It features high precision and little impact.
上传时间: 2013-11-16
上传用户:yare
概述 BL22P64可以作为许多中高档小家电(如电磁炉、微波炉、豆浆机等)的控制芯片,这一类小家电通常都需要灵活的、可编程的控制方式,并需要AD、PWM等资源,同时满足抗电磁干扰(EMC)4KV的要求。 主要特点 ●8位CISC型内核(兼容MotorolaHC05)●4KbyteOTPROM●208byteRAM●3组IO口(最多18个IOPIN)●1个PWM输出●1个8位基本定时器●1个8位带MATCH输出的定时器●1个10位ADC(9路输入)●2个外中断、1个定时器中断、1个PWM中断●WATCHDOG●3V低压复位●可选晶振/RC振荡晶振400K-4MHzRC振荡有3.2MHz(@5V,typ.)、0.5MHz(@5V,typ.)、外接电阻3种可选●工作电压2.7-5.5V●工作温度-40-85℃●封装形式:SOP20/DIP20/SOP16
上传时间: 2013-11-06
上传用户:DE2542
针对目前采用的热敏电阻测量方法,提出了采用单总线数字式温度传感器DS18B20和单片机组成的新型温度测量仪。介绍DS18B20的结构和工作原理,以及单总线工作原理,给出了由Mega8单片机和DS18B20构成的单总线温度测量仪的硬件电路及软件流程图。经试验基于单总线器件DS18B20的温度测量仪,具有测量准确、测温范围宽、体积小、控制方便等优点。 Abstract: This paper brings forward a new temperature meter composed of 1-Wire temperature sensor DS18B20 and MCU which has advantage of the thermistor. In the article, the DS18B20's structure and controlling principles are introduced and hardware circuit and software diagram of the temperature meter are given.After been tested,the temperature meter has the advantages of accurate measurement, wide temperature range, small volume and convenient controlling.
上传时间: 2013-10-31
上传用户:hzy5825468
介绍一种以MSP430单片机为基础的智能频率测量系统,采用硬件逻辑与软件指令相结合的方式控制闸门,实现0 MHz~10 MHz范围内无档切换的等精度测量。 Abstract: An intelligent frequency measurement system based on MSP430 singlechip is introduced. The system uses a way that can combine hardware logic and software instructions to contronl the strobe ,and completes the functions of equal precision in the range of 0MHz~10MHz without shifting
上传时间: 2013-10-28
上传用户:dbs012280
PCF8563 是低功耗的CMOS 实时时钟/日历芯片,它提供一个可编程时钟输出,一个中断输出和掉电检测器,所有的地址和数据通过I2C 总线接口串行传递。最大总线速度为400Kbits/s,每次读写数据后,内嵌的字地址寄存器会自动产生增量。
上传时间: 2013-10-19
上传用户:奇奇奔奔
本文对激光扫描车身坐标测量系统的数据采集部分进行了深入研究,设计了基于“AVR+FIFO+CPLD”的数据采集及处理模块;解决了当多路信号有数据同时传输时,如何将数据完整地写入FIFO的问题,实现了数据的有效采集;编写了完整的CPLD控制程序和AVR数据采集程序,为准确测量待测点的坐标提供了可靠的数据来源。
上传时间: 2013-10-29
上传用户:asaqq
用Verilog实现8255芯片功能
上传时间: 2013-10-31
上传用户:sunjet