The classic LM317 adjustable-output linear voltage regulator offers a relatively high, if package-dependent, current-handling capability. In addition, the LM317 features current limiting and thermal-overload protection. With the addition of a few com…

Targeting use in portable-system applications that require raising a battery's voltage to a higher level, IC boost regulators often include output transistors that can drive storage inductors. However, most boost regulators' absolute-maximum input-vo…

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…

A variable resistor that integrates a programmable, temperature-indexed look-up table can compensate for the temperature drift of a voltage regulator. In this case, the look-up table can change the resistance every 2°C over a range of –40 to +102°C,…

The circuit in Figure 1 delivers programming voltages to an EEPROM under the control of an external DAC (not shown). You can replace the DAC with a potentiometer to create a general-purpose power supply operating from 12V and able to deliver a variab…

LDO Regulator High accuracy voltage regulator Vout = 2.5V * (1 + ( 5.6 / 6.8 ) ) = 4.55V Recently the author had to adapt  a standard circuit configuration  (which often uses an npn bipolar) so as to operate as a low-dropout (LDO) regulator. The circ…

LDO current regulator for power LED Challenge You've got a power LED? Great! Build a flash light! What does the spec say? "Voltage: 3.6 .. 3.8 V, power 3 W." Okay. This means that it draws some 800 mA. Three mignon cells give 4.5 V for at least…

BACKGROUND Embodiments of the invention relate to the field of electronic systems and power management. More particularly, embodiments of the invention relate to a method and apparatus for a zero voltage processor sleep state. As the trend toward adv…

转自蜗窝科技:http://www.wowotech.net/pm_subsystem/regulator_framework_overview.html 1. 前言 Regulator,中文名翻译为“稳定器”,在电子工程中,是voltage regulator(稳压器)或者current regulator(稳流器)的简称,指可以自动维持恒定电压(或电流)的装置. voltage regulator最早应用于功放电路中,主要用于滤除电源纹波(100或者120Hz)和噪声,以及避免“输出电压随负…

前言 1.  什么是regulator?      regulator翻译为"调节器",分为voltage regulator(电压调节器)和current(电流调节器).一般电源管理芯片(Power Management IC)中会包含一个甚至多个regulator.   2.  regulator有什么作用?     通常的作用是给电子设备供电.大多数regulator可以启用(enable)和禁用(disable)其输出,同时也可以控制其输出电压(voltage)和电流(curr…

Voltage-regulator design for high output currents can be a critical and difficult task. Although voltage regulators with 1A maximum output current are simple to design, thanks to 78xx three-terminal voltage regulators, at output currents higher than…

前几天收到 Arduino M0,试各项功能都正常,可就是串口监视器/串口助手不能显示程序里打印的输出,好生奇怪,各种换波特率各种PC串口程序换着试,资料不多,官方资料也只说到 Serial1 用于 pin 0 1 的(实际上测试的时候提示 Serial1 没有声明),Serial 用于 USB 通信,根本只字未提 SerialUSB 的事,直到今天,哦不,是昨天了,下午在群里提问,“忠忠”回复有一个 SerialUSB 用于 USB 的串口通信,这才知道了这个事.真是好坑人啊. 官网链接:ht…

http://en.wikipedia.org/wiki/Motherboard_form_factor Computer form factor From Wikipedia, the free encyclopedia   (Redirected from Motherboard form factor)   For computers form factors both larger and smaller than desktop personal computers, see list…

orcad元件库的查找: 如下:1.原理图常用库文件: MiscellaneousDevices.ddb: DallasMicroprocessor.ddb: IntelDatabooks.ddb: ProtelDOSSchematicLibrar: 2.PCB元件常用库: Advpcb.ddb: GeneralIC.ddb: Miscellaneous.ddb 3.分立元件库: 部分分立元件库元件名称及中英对照 AND                         与门 ANTENNA  …

转自:http://bbs.eetop.cn/thread-459121-1-1.html 在平时的学习中,我们都有接触LDO和DC/DC这一类的电源产品,但作为学生的我们队这些东西可能了解不够深刻,在这里我给大家介绍一下DC/DC和LDO,并且对他们进行详细分析. LDO是low dropout voltage regulator的缩写,就是低压差线性稳压器. DC-DC,其实内部是先把DC直流电源转变为交流电电源AC.通常是一种自激震荡电路,所以外面需要电感等分立元件. 然后在输出端再通过积…

RFID读写器的工作原理 RFID的数据采集以读写器为主导,RFID读写器是一种通过无线通信,实现对标签识别和内存数据的读出和写入操作的装置. 读写器又称为阅读器或读头(Reader).查询器(Interrogator).读出装置(Reading Device). 扫描器(Scanner).通信器(Communicator).编程/编码器(Programmer)等等. 读写器工作原理 RFID读写器的基本原理是利用射频信号与空间耦合传输特性,使电子标签与阅读器的耦合元件在射频耦合通道内进行能量传…

说明:本介绍包含了\capture\library\pspice和capture\library\pspice\advanls目录下所有库,但由于作者水平有限,介绍得也比较简单,有些说明可能不一定对.请高手指正.谢谢! 1.1_SHOT              : 10个杂项器件,其中有54,74,CD的2.7400~74S            : 74系列的器件3.AA_IGBT             : IGBT是强电流.高压应用和快速终端设备用垂直功率MOSFET4.AA_MISC…

临界段         代码的临界段也称为临界区,一旦这部分代码开始执行,则不允许任何中断打断.为确保临界段代码的执行不被中断,在进入临界段之前须关中断,而临界段代码执行完毕后,要立即开中断.      由于Cortex-M3/M4的RTX内核库中没有关闭中断的操作,也就是说RTX的源码中不存在临界段. 中断锁     中断锁就是RTOS提供的开关中断函数,因为Cortex-M3/M4的RTX源码中没有关闭中断的操作,所以也就没有提供开关中断函数. 由于RTX没有提供开关中断函数,如果用户自己的…

原理图常用库文件:Miscellaneous Devices.ddbDallas Microprocessor.ddbIntel Databooks.ddbProtel DOS Schematic Libraries.ddbPCB 元件常用库:Advpcb.ddbGeneral IC.ddbMiscellaneous.ddb分立元件库部分 分立元件库元件名称及中英对照AND 与门ANTENNA 天线BATTERY 直流电源BELL 铃,钟BVC 同轴电缆接插件BRIDEG 1 整流桥(二极管)B…

1.前言 k64 datasheet描述了Freescale MCU的特性.架构和编程模型,主要是面向使用MCU的系统架构和软件应用开发人员. 2.模块划分 datasheet主要按功能对模块进行划分,包括如下模块: 模块名称 模块说明 ARM® Cortex®-M4 core ARM Cotex M4 32-bit MCU core,加上DSP指令和基于ARMV7架构的单精度浮点单元 System 系统集成模块? 电源管理和多模式控制 唤醒单元 杂项控制模块 Crossbar switch ?…

JTAG Finder Figuring out the JTAG Pinouts on a Device is usually the most time-consuming and frustrating process and Finding the pinouts for these ports allows you to access with correct JTAG Devices likeGPG ORT,  and JTAG Finder helps you to get sta…

http://www.elnec.com/products/universal-programmers/beeprog2c/ FPGA based totally reconfigurable 48 powerful TTL pindrivers provide H/L/pull_up/pull_down and read capability for each pin of socket. Advanced pindrivers incorporate high-quality high-sp…

http://blog.csdn.net/wdsfup/article/details/52302142 http://www.manew.com/blog-166674-12962.html Gentoo LinuxGentoo内核(gentoo-sources)特有的选项 Gentoo Linux supportCONFIG_GENTOO_LINUX 选"Y"后,将会自动选中那些在Gentoo环境中必须开启的内核选项,以避免用户遗漏某些必要的选项,减轻一些用户配置内核的难度.建议选…

http://en.wikipedia.org/wiki/Intel_Tick_Tock Atom Roadmap[16]   Fabrication process Microarchitecture Release date Processors/SoCs MID, Smartphone Tablet Nettop, netbook Embedded Server CE   45 nm Bonnell 2008 Silverthorne N/A Diamondville Tunnel Cre…

FIELD OF THE INVENTION The present invention is related to computing systems, and more particularly to a system and method for adjusting to changes in processor performance. BACKGROUND INFORMATION Designers of mobile computing platforms are faced wit…

============================================================================== 深入linux kernel内核配置选项 ============================================================================== 如果自己不亲自实践配置的话,你永远也体会不到内核的真实所在. 使用过linux的发行版之一gentoo的话,你应该知道这是一个彻头彻尾的自定义…

转自: Linux Core Power Management User's Guide (v3.14) http://processors.wiki.ti.com/index.php/Linux_Core_Power_Management_User's_Guide_(v3.14)?keyMatch=Linux%20Core%20Power&tisearch=Search-EN Linux Core Power Management User's Guide (v4.1) http://proc…

1.前言 上一节讲了Zigbee的睡眠定时器利用外部按键使系统从休眠态唤醒到工作态,其核心在于: 61 void SysPowerMode(uchar mode) 62 { 63 if(mode > 0 && mode < 4) 64 { 65 SLEEPCMD |= mode; //设置系统睡眠模式 66 PCON = 0x01; //进入睡眠模式 ,通过中断唤醒 67 } 68 else 69 PCON = 0x00; //主动/空闲模 通过中断唤醒系统 70 } 其中参数…

About this project This project was developed after I had to find out that controlling my RGB ambient light with the normal infrared remote control was complicated and not reliable. Within a few months I build this solution that enabled controlling m…

Leakage power随着CMOS电路工艺进程,功耗越来越大. Power Domain的开关一般通过硬件中的timer和系统层次的功耗管理软件来进行控制,需要在一下几方面做trade-off: 1)可能节省的leakage power, 2)entry和exit的power和time消耗, 3)Power sleep和active的频率, power gating可以完全关掉dynamic的power消耗,但是leakage只会减少,不会消失,因为power gating技术仍需要加入一些…