An Isolated DAC Using PWM Output Arduino‘s (ATmega328P) PWM outputs via analogWrite can be conveniently turned into analog voltage levels through the use of simple RC filters. Since the PWM outputs are not isolated, using them to drive other devices…

http://www.cs.indiana.edu/~geobrown/book.pdf An example of a basic timer is illustrated in Figure 10.1. This timer has four components – a controller, a prescaler (PSC), an “auto-reload” register (ARR) and a counter (CNT). The function of the prescal…

http://www.ti.com/lit/an/spraa88a/spraa88a.pdf http://www.ti.com/litv/zip/spraa88a The high-resolution PWM on the TMS320F280x DSP family has been used to implement a digital-to-analog converter with the addition of an external analog low-pass filter.…

how to generate an analog output from a in-built pwm of Atmega 32AVR microcontrloller? you need a resistor, a capacitor and an opamp. opamp is not really necessary when you are driving a mosfet, but will make life a bit easier. just be aware, that th…

[TI博客大赛][原创]LM3S811之基于PWM的DAC http://bbs.ednchina.com/BLOG_ARTICLE_3005301.HTM http://www.fpga4fun.com/PWM_DAC_3.html One-bit DAC Take one pin of an FPGA, connect a speaker and listen to an MP3? Easy. Here, we'll use a PC to decode an MP3, and then s…

High accuracy voltage regulator Good morning everybody, I want to make a accurate voltage regulator based on the Basic Stamp.Total range 0-10 V and a resolution of eg 5 mV. So this means 2000 steps.Maximum current around 250 mA. I tried to do somethi…

Intel® 82599 10 GbE Controller Datasheet 15.0 Glossary and Acronyms 术语表 缩写 英文解释 中文解释 1 KB A value of 1 KB equals 1024 bytes. 1's complement A system k…

终于逮了个忙里偷闲的机会,就再学一下LPC1768的外围功能吧,循序渐进是学习的基本规则,也许LPC1768的DAC与8位单片机16位单片机里面集成的DAC操作类似,但是既然这是懒猫的学习日志,就顺便把DAC再好好复习一下了,或许能品出个什么味来^_^DAC是Digital to Analog Converter的缩写,中文名就是数模转换器,D/A转换器一般由数码寄存器.模拟电子开关电路.解码网络.求和电路及基准电压等几部分组成.如下图所示: 图1-1 DAC原理框图 数字量以串行或并行方式输入…

视频处理单元Video Processing Unit VPU处理全局视频处理,它包括时钟门.块复位线和电源域的管理. 缺少什么: •完全重置整个视频处理硬件块 •VPU时钟的缩放和设置 •总线时钟门 •启动视频处理硬件块 •启动HDMI控制器和PHY 视频处理单元 显示控制器由以下几个组件组成: DMC|---------------VPU (Video Processing Unit)----------------|------HHI------| | vd1   _______    …

今天再看过半年前自己写的这篇发现自己当时理解有误,stm32f10x.h与库开发并未存在太大关系,只是一个最为重要的寄存器地址到寄存器结构体变量的映射. stm32f10x.h 这个头文件是STM32开发最为重要的一个头文件相当于我玩51那会,那个 reg52.h .但对于STM32来说,它的寄存器数量是非常多的,如果按照操作51一样的方法来操作32的话,查数据手册来配置寄存器是非常麻烦的.所以ST开发了这个库,方便大家开发,缩短开发周期.在 stm32f10x.h 中前面一开始就出现了: #i…

从我们学到的知识了解到,我们的单片机是一个典型的数字系统.数字系统只能对输入的数字信号进行处理,其输出信号也是数字信号.但是在工业检测系统和日常生活中的许多物理量都是模拟量,比如温度.长度.压力.速度等等,这些模拟量可以通过传感器变成与之对应的电压.电流等电模拟量.为了实现数字系统对这些电模拟量的检测.运算和控制,就需要一个模拟量和数字量之间相互转换的过程.这节课我们就要学习这个相互转换过程.17.1 A/D和D/A的基本概念A/D是模拟量到数字量的转换,依靠的是模数转换器(Analog to…

模数转换器即A/D转换器,或简称ADC,通常是指一个将模拟信号转变为数字信号的电子元件.通常的模数转换器是将一个输入电压信号转换为一个输出的数字信号.由于数字信号本身不具有实际意义,仅仅表示一个相对大小.故任何一个模数转换器都需要一个参考模拟量作为转换的标准,比较常见的参考标准为最大的可转换信号大小.而输出的数字量则表示输入信号相对于参考信号的大小. 简介 将模拟信号转换成数字信号的电路,称为模数转换器(简称a/d转换器或adc,analog to digital converter),A/D转…

嵌入式硬件之ADC/DAC 写在前面 这几天在做一个寒假练项目,其中涉及到了音频的处理,ADC.DAC再次进入到了我的视野,并引起了我新的思考. 1.初次相识 记得去年七月份,本科毕业刚离校,就到研究生学校这边打杂,导师让我参与了一个小项目,那个控制器电路中有一个让我印象很深的的电路--ADC采样电路. 这个电路目的很简单,就是读出P35的AD采样值,借此来估算VDD的大小,进行监测. 它的模拟信号就是电阻两端的电压,数字信号是通过P35读取到的数值,再根据相应的计算公式,就可以得出VDD的大小…

Emerging digital ICs for power control lack basic features, such as the built-in gate drive and current limiting, that you would normally find in analog ICs. Digital-power controllers generally have only PWM (pulse-width-modulated)-logic output, and…

Low-cost, 8-bit, single-chip microcontrollers are stingy when it comes to on-chip PWM (pulse-width-modulation) resources. The use of a PWM resource often forces a designer to sacrifice a capture/compare or timer channel because the PWM channel shares…

http://electronicdesign.com/digital-ics/digital-current-mode-control-challenges-analog-counterparts Digital Current-Mode Control Challenges Analog Counterparts Electronic Design Bryan Kris Thu, 2006-11-16 (All day) Switch-mode power supplies can use…

http://pdfserv.maximintegrated.com/en/an/AN818.pdf http://www.maximintegrated.com/app-notes/index.mvp/id/818 Digital Adjustment of DC-DC Converter Output Voltage in Portable Applications Abstract: This tutorial discusses methods for digitally adjusti…

how determine the RC time constant in PWM digital to analog low-pass filter? I 'm looking for the best RC time constant and its reason in a PWM to convert digital signal to analog based on duty-cycle and frequency and other parameters. PWM frequency…

The Secret Mixed-Signal Life of PWM Peripherals Pulse-width modulation (PWM) peripherals have enjoyed a long association with microcontrollers and power control, starting with motor control and power conversion. For the most part, these applications…

http://analogtalk.com/?p=534 http://analogtalk.com/?p=551 Posted by AnalogAdvocate on April 09, 2010 Design, General In today’s highly competitive electronics environment, designers are constantly looking for ways to reduce overall system costs.  One…

http://www.edn.com/design/analog/4337128/Make-a-DAC-with-a-microcontroller-s-PWM-timer Many embedded-microcontroller applications require generation of analog signals. An integrated or stand-alone DAC fills the role. However, you can often use PWM si…

PWM(Pulse Width Modulation)简介 PWM,也就是脉冲宽度调制,用于将一段信号编码为脉冲信号,也就是方波信号.多用于在数字电路中驱动负载随时间变化的电子元件,如LED,电机等. 在单片机中,我们常用PWM来驱动LED的暗亮程度,电机的转速等. 我们知道,在数字电路中,电压信号是离散的: 不是 0(0V)  就是 1(5V或者3.3V), 那么如何输出介于 0v 和  5V之间的某个电压值呢? 我们先来举个实际的例子,一看就懂,胜过千言万语. 如下图,要让让数字信号模拟出…

http://sourceforge.net/projects/openprogrammer/?source=navbar Open Programmer http://openprog.altervista.org/OP_eng.html#Quick Open Programmer v0.8.x Quick facts Completely free and Open Source (including firmware) Programs PIC10-12-16-18-24, dsPIC30…

A standard technique for generating analog voltages using µCs is to use a PWM output and filter the signal with a simple RC filter (Figure 1). The voltage of the PWM signal is directly proportional to the µC's supply voltage, so it is not necessarily…

PWM_T Struct Reference Control Register » Pulse Width Modulation Controller(PWM)   typedef struct { /** * @var PWM_T::CTL0 * Offset: 0x00 PWM Control Register 0 * ---------------------------------------------------------------------------------------…

M451提供了两路PWM发生器.每路PWM支持6通道PWM输出或输入捕捉.有一个12位的预分频器把时钟源分频后输入给16位的计数器,另外还有一个16位的比较器.PWM计数器支持向上,向下,上下计数方式.PWM用比较器和计数器的比较来产生事件,这些事件用来产生PWM脉冲,中断,EADC/DAC转换触发信号. PWM发生器支持两种标准PWM输出模式:独立模式和互补模式,它们的架构不同.标准输出模式又有两种输出功能:组功能和同步功能.组功能可以在独立模式和互补模式下使能.同步功能只有在互补模式下才可以…

本文转载自:https://blog.csdn.net/mike8825/article/details/51656400 1. 前言 PWM是Pulse Width Modulation(脉冲宽度调制)的缩写,是利用微处理器的数字输出来对模拟电路进行控制的一种非常有效的技术,其本质是一种对模拟信号电平进行数字编码的方法.在嵌入式设备中,PWM多用于控制马达.LED.振动器等模拟器件. PWM framework是kernel为了方便PWM driver开发.PWM使用而抽象出来的一套通用API…

发生异常的现象: msm8953 lcd在快速亮灭的情况下背光概率性休眠不灭:测量高通pwm,发现正常的时候pwm的管脚LCM_BL_PWM为低电平,失败的时候为高电平: 根据原理图: mpp是什么? mpp是基于电源pmic的管脚,也叫做多功能管脚:MPP的全称是Multi Purpose Pin:可以做电源.gpio.ADC.PWM.SINK等功能. 背光的控制方式: LCD控制IC支持动态背光控制功能(CABC)通过解析图像的直方图动态改变输出PWM的占空比从而动态调节LCD的背光,在不改…

1. Requirements To generate a PWM output, we need to create a train of pulses with constant period and variable duty cycle. The duty cycle, being the modulation is the pulse width. Typically, a timer is used to maintain both the period and duty cycle…

/**************************************************************************//** * @file main.c * @version V3.00 * $Revision: 2 $ * $Date: 15/09/02 10:03a $ * @brief Demonstrate how to set GPIO pin mode and use pin data input/output control. * @note *…