Current Sourcing and Sinking

Current sourcing and sinking is often mentioned in relation to electronics, digital systems and microcontrollers, but what is current sourcing and what is current sinking?
Current sourcing and sinking refers to the way that an external load is connected to a circuit, system, microcontroller or other electronic device.

Circuit Diagram

The circuit diagram below shows the difference between current sourcing and current sinking.

Current Sourcing (left) and Current Sinking (right)

The load in the circuit diagram is shown as a 1k resistor, but can be any load that draws a current such as an LED and series resistor, the coil of a relay, a light bulb, etc.
The device in the circuit diagram can be any electronic circuit or device such as a microcontroller, FPGA, CPLD, logic circuit, etc.

Current Sourcing

When a load is connected to a device so that the device supplies current to the load (sources current) then the configuration is said to be current sourcing.
An example is a series resistor and LED connected between a microcontroller pin and GND. When the microcontroller pin is switched high (logic 1) then the microcontroller will source current to the load. In this configuration a logic 1 will supply power to the load (switch the LED on) and a logic 0 will switch power to the load off (switch the LED off).

Current Sinking

When a load is connected to a device so that current flows from the power supply through the load and into the device, then the configuration is said to be current sinking. When current flows into the device, it is said to be sinking current.
An example of current sinking is when a series resistor and LED is connected between power (e.g. +5V) and a microcontroller pin. When the microcontroller pin is switched high (logic 1) then the current to the load is switched off. When the microcontroller switches the pin low (logic 0), current flows through the load.

Reference

https://startingelectronics.org/articles/current-sourcing-sinking/

Current Sourcing (拉電流) and Current Sinking（灌電流）的更多相关文章

  1. 拉电流（source current）与灌电流（sink current）

    对一个互补输出的驱动器而言,从输出端向外电路流出的负载电流称为拉电流(SOURCE CURRENT):从外电路流入输出端的负载电流称为灌电流(SINK CURRENT):在没有负载的情况下,驱动器本身 ...

  2. 限流(三)Redis + lua分布式限流

    一.简介 1)分布式限流 如果是单实例项目,我们使用Guava这样的轻便又高性能的堆缓存来处理限流.但是当项目发展为多实例了以后呢?这时候我们就需要采用分布式限流的方式,分布式限流可以以redis + ...

  3. java IO选择流的原则及其与IO流相关类的关系

    1 按照用途进行分类 1.1 按照数据的来源(去向)分类 是文件:FileInputStream, FileOutputStream, FileReader, FileWriter 是byte[]:B ...

  4. Java基础知识强化之IO流笔记63：随机访问流RandomAccessFile

    1. 随机访问流RandomAccessFile RandomAccessFile类不属于流,是Object类的子类.但它融合了InputStream和OutputStream的功能.支持对随机访问文 ...

  5. Java IO流学习总结三：缓冲流-BufferedInputStream、BufferedOutputStream

    Java IO流学习总结三:缓冲流-BufferedInputStream.BufferedOutputStream 转载请标明出处:http://blog.csdn.net/zhaoyanjun6/ ...

  6. (19)IO流之字符流FileReader和FileWriter，缓冲字符流---缓冲输入字符流BufferedReader和缓冲输出字符流BufferedWriter

    字符流,读取的文件是字符的时候,有两个基类一个是Reader,一个是Writer这有点拟人的感觉,人直接看懂的是文字 字符流 字节流:读取的是文件中的二进制字节流并不会帮你转换成看的懂得字符 字符流: ...

  7. IO流（File类，IO流的分类，字节流和字符流，转换流，缓冲流，对象序列化）

    1.File类 File类可以在程序中 操作文件和目录.File类是通过建立File类对象,在调用File类的对象来进行相关操作的. 示例: public class Demo01 { public  ...

  8. Java基础---Java---IO流-----对象的序列化、管道流、RandomAccessFile、数据类型的流对象DataStream、ByteArrayStream

    ObjectInputStream 对以前使用 ObjectOutputStream 写入的基本数据和对象进行反序列化. ObjectOutputStream 和 ObjectInputStream ...

  9. 字节流转字符流OutputStreamWriter、InputStreamReader，关闭流的方法

    转换时可以指定编码格式:GBK.UTF-8 public class Demo { public static void main(String[] args) { File f = new File ...

随机推荐

  1. 【css】如何实现响应式布局

    “自适应网页设计”到底是怎么做到的?其实并不难. 首先,在网页代码的头部,加入一行viewport元标签. <meta name="viewport" content=&qu ...

  2. mysql的性能优化案例

    在一次项目实现中,以前写了个程序,将在txt文件中的电话号码和对应的类型往数据库中插入,小数据量的情况下,用个数组遍历循环的方式,很容易解决,但是当数据量一下 但是,几十万个电话一次性插入,就变得耗时 ...

  3. hive数据的导入导出方式

    导入方式 1.load方式 load data local inpath 'local_path' into table tb_name; 从本地复制了文件到表的路径下 应用场景:大部分的使用,文件几 ...

  4. Harbor HA部署-使用Ceph RADOS后端

    1. 前言 Harbor 1.4.0版本开始提供了HA部署方式,和非HA的主要区别就是把有状态的服务分离出来,使用外部集群,而不是运行在本地的容器上.而无状态的服务则可以部署在多个节点上,通过配置上层 ...

  5. Redis实现之服务器

    命令请求的执行过程 一个命令请求从发送到获得回复的过程中,客户端和服务器需要完成一系列操作.举个栗子,如果我们使用客户端执行以下命令: 127.0.0.1:6379> SET KEY VALUE ...

  6. mysql基础查询

    #进阶1:基础查询/*语法:select:查询列表 from 表名; 类似于:System.out.println(打印的东西); 特点:1.查询列表可以是:表中的字段.常量值.表达式.函数2.查询的 ...

  7. php和js中数组的总结

      php中数组的表示方法:array()或者[] js中数组的表示方法:new array()或者[] 一.php中初始化命名数组 在PHP中声明数组的方式主要有两种:一是应用array()函数声明 ...

  8. linux环境搭建系列之memcached安装步骤

    1.从官网在线下载最新的安装包 wget http://memcached.org/downloads/memcached-1.4.34.tar.gz 该命令为在线下载 注意:最新的地址会变动,所以最 ...

  9. IOS架构

    iPhone OS(现在叫iOS)是iPhone, iPod touch 和 iPad 设备的操作系统. 1,Core OS: 是用FreeBSD和Mach所改写的Darwin, 是开源.符合POSI ...

  10. mini购物车程序

    product_list=[("Iphohe",5800),("Mac Pro Book",12900), ("xiaomi 4c",120 ...