数字信号处理器dsPIC33F集多通道高精度A/D转换、多通讯模式、看门狗、CMOS Flash技术等于一体,其内部可完成所有数据操作,实现总线不出芯片技术。将该处理器应用于微机保护装置,提出基于dsPIC33F微处理器的微机保护装置的设计方案,给出相应的接口电路与软件流程。该设计方案结构简单,性价比及可靠性高,开发周期短,具有一定的实用推广价值。所研制的微机保护装置现场运行效果良好。 Abstract: The dsPIC33F microprocessor has a plentiful interior resource which contains multi-channel,high precision A/D converters,multi-communication module,watchdog,CMOS Flash technology,and so on.All data manipulations is accomplished interiorly.What is more,it makes the technology that bus does not go beyond the chip comes into practice.The paper put forwards a design scheme based on dsPIC33F microprocessor.The scheme has the advantages of simple structure,high reliability and shortened exploitation cycle.What is more,it has definite practicality and reference.The microcomputer protection device has been put into operation with excellent effects.
上传时间: 2013-11-16
上传用户:开怀常笑
以89S52单片机和EP1C6Q240C8型FPGA为控制核心的多功能计数器,是由峰值检波、A/D转换、程控放大、比较整形、移相网络部分组成,可实现测量正弦信号的频率、周期和相位差的功能。多功能计数器采用等精度的测量方法,可实现频率为1Hz~10MHz、幅度为0.01~5Vrms的正弦信号的精确测频,以及频率为10Hz~100kHz、幅度为0.5~5Vrms的正弦信号精确测相。液晶显示器能够实时显示当前信号的频率、周期和相位差。该多功能计数器精度高,界面友好,实用性强。 Abstract: A multi-function counter,which uses89S52MCU and EP1C6Q240C8FPGA as a control core,consists of peak detector,A/D conversion,program-controlled amplification,compared shaping and phase-shifting network part.The counter measures the frequency,period and phase of sinusoidal signal.With the equal precision method,the multi-function counter achieves the precise frequency measurement of the sinusoidal signal which its frequency is from1Hz to10MHz,its amplitude is from0.01Vrms to5Vrms,as well as the accurate phase measurement of the sinusoidal signal which its frequency is from10Hz to100kHz,its amplitude is from0.5Vrms to5Vrms.The LCD monitor real-time displays the frequency,period and phase difference of current signal.The multi-function counter features high precision,friendly interface,and strong practical.
上传时间: 2013-11-15
上传用户:gy592333
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
前言 自从盛群半导体公司成立以来,即致力于单片机产品的设计与开发。虽然盛群半导体提供给客户各式各样的半导体器件,但其中单片机仍是盛群的主要关键产品,未来盛群半导体仍将继续扩展单片机产品系列完整性与功能性。通过长期累积的单片机研发经验与技术,盛群半导体能为各式各样的应用范围开发出高性能且低价位的单片机芯片。许多连接到外部感应器的重要应用需要处理模拟信号,所有的这些应用,在它们可以被单片机处理之前需要通过一个A/D转换器做模数信号的转换。为了满足这些需求,盛群开发出A/D系列的单片机,除了拥有I/O系列的所有特性和功能外,还含有集成的多通道A/D转换器,它的解析度和通道个数可调。而PWM功能和I2C接口,则进一步增加了A/D系列单片机的功能和应用的可行性。
上传时间: 2013-12-05
上传用户:waitingfy
针对51单片机系统中常用的A/D转换器价格高、精度低的缺点,介绍TI公司的16 位的带有I2C串行接口的A/D转换器ADS1110的工作原理,给出ADS1110与AT89C51单片机系统的接口电路和软件设计。实践证明,ADS1110具有高性价比和实用性。 Abstract: According to the disadvantages of high expense and low accuracy of the general A/D converter used in MCS51 microchip system,the principle and working process of a high accuracy 16-bit A/D conversion ADS1110 which has I2C bus and belongs to TI Company are proposed here as well as the interface of ADS1110 to AT89C51 and software list.It is proved to be high performance index and practicability.
上传时间: 2013-11-21
上传用户:gyq
详细介绍了TLC1549系列模数转换器的特点及工作原理,然后根据TLC1549的工作时序和A/D转换原理针对实际问题编写了详细的汇编语言程序。 Abstract: A basic principle and characteristic of TLC1549 analog-to-digital converter are introduced? detailedly in this article.Through engineering-oriented illustration,a microcomputer programmer base on basic principle and time sequence of TLC1549 is writted.
上传时间: 2014-07-16
上传用户:blans
利用Atmel公司的ATmega168微处理器,采用A/D转换方式来实现按摩椅控制器的键盘接口,通过在硬件电路中巧妙地选择电阻,在软件设计中采用数字滤波、二分法和区间鉴定等方法,灵敏可靠地实现了按摩椅中30个按键的处理。给出了硬件电路设计和软件设计思想以及部分汇编代码。 Abstract: This paper chooses A/D conversion method to realize the keyboard interface of the controller by using ATmega168 microchip from Atmel Company.It accomplishes 30-key dealing sensitively and reliably in massage chair through skillfully selecting resistors in hardware circuit and using digital filter,dichotomy and area-judging method in software design.The hardware design circuit, software design idea and partly assembles code are presented mainly.
上传时间: 2014-01-10
上传用户:咔乐坞
摘要:键盘担负着向系统发出命令和查询系统工作状态的重任。由于各种单片机所提供的片内外资源不同,所以在进行键盘扩展时其硬件电路的形式也多种多样。文中介绍了利用单片机内部的A/D转换通道、并行口以及片外扩展芯片等方法扩展键盘的硬件电路及电路工作原理,并给出了部分程序。关键词:单片机;键盘;A/D转换;并行口;串行口
上传时间: 2013-11-15
上传用户:kang1923
ICI7135是4位双积分A/D转换芯片,可以转换输出±20000个数字量,有STB选通控制的BCD码输出,与微机接口十分方便.ICL7135具有精度高(相当于14位A/D转换),价格低的优点.其转换速度与时钟频率相关,每个转换周期均有:自校准(调零),正向积分(被测模拟电压积分),反向积分(基准电压积分)和过零检测四个阶段组成,其中自校准时间为10001个脉冲,正向积分时间为10000个脉冲,反向积分直至电压到零为止(最大不超过20001个脉冲).故设计者可以采用从正向积分开始计数脉冲个数,到反向积分为零时停止计数.将计数的脉冲个数减10000,即得到对应的模拟量.图1给出了ICL7135时序,由图可见,当BUSY变高时开始正向积分,反向积分到零时BUSY变低,所以BUSY可以用于控制计数器的启动/停止.
上传时间: 2013-11-02
上传用户:hebanlian
在超声技术日益发展的今天,一个高质量的超声信号源成为各种超声产品的主动力。传统模拟超声信号源的智能化控制尚不完善,只能直接产生适当频率的电信号,用以驱动特定的超声波换能器。这对于信号源的合理利用是一个较大的弊端。本文介绍了一种采用单片机与复杂可编程逻辑器件(CPLD)相结合的方法设计的新型任意波形发生器(AWG)。其中波形合成采用了直接数字合成(DDS)技术。本系统能输出频率和幅度可调的多种标准函数波以及任意波形。信号频率范围覆盖超低频和高频,同时极大地提高了频率的分辨率和准确度,因此可以用它代替常用的模拟超声信号源。本系统采用单片机(AT89S52)对整机的输入、输出过程和波形数据采集进行控制。高速的CPLD(EPM7128S)将波形数据从存储器(AT28C256)中读出并送给波形生成DAC(AD7524)进行转换,形成所要的波形。并通过改变幅度控制DAC(DAC0832)的输入值来调节输出波形的峰值。用户通过面板上的矩阵键盘和1602液晶模块进行人机交互。串行E2PROM(AT24C02)实现了波形数据掉电保存功能。任意波形数据既可由输入的模拟信号经A/D转换后获得,也可采用具备RS-232接口的手写板直接输入。
上传时间: 2013-11-25
上传用户:wvbxj