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. ZendFramework-2.4 源代码 - 关于MVC - Controller层

    // 1.控制器管理器 class ServiceManager implements ServiceLocatorInterface { public function __construct(Co ...

  2. Django API 为 D3 提供数据

    在工作中见过有的人即便使用了Django,依然还在采取json或geojson的文件形式为页面提供数据,相当于嵌入数据而非加载.下面是个简单有效的例子: 先从 model.py 开始 # models ...

  3. c++ vector实例

    #include <iostream> #include <string> #include <vector> #include <iostream> ...

  4. codeforces 258D DP

    D. Little Elephant and Broken Sorting time limit per test 2 seconds memory limit per test 256 megaby ...

  5. mysql同步故障解决

    故障现象:Slave_SQL_Running: No Slave状态:mysql> show slave status\GSlave_IO_Running: YesSlave_SQL_Runni ...

  6. UVA - 10213 How Many Pieces of Land?（欧拉公式 + 高精度）

    圆上有n个点,位置不确定.问这些点两两连接成的线段,最多可以把圆划分成多少块平面? 欧拉公式:V-E+F = 2,V是点数,E是边数,F是面数. 答案是F=C(n,4)+C(n,2)+1,看的别人推的 ...

  7. Codeforces Round #462 (Div. 2) D. A Determined Cleanup

    D. A Determined Cleanup time limit per test1 second memory limit per test256 megabytes Problem Descr ...

  8. datagrid的右键菜单

    1. 2.右键菜单,主要是用onRowContextMenu:function(e,index,row){}方法来实现 onRowContextMenu:function(e,index,row){ ...

  9. day40--mysql step4 SQLAlchemy

    1.unique = True 表示启动唯一索 2.有add 必须有commit这样数据才会提交 3.ORM功能 #!/usr/bin/env python # -*- coding:utf-8 -* ...

  10. Asp.net自定义控件开发任我行（6）-嵌入资源下

    摘要 上一章,我们讲了嵌入.css文件,这一章,我们来讲一下嵌入.js文件,也顺带一个嵌入Image文件 内容 我们前面的几章,一运行,下拉框就显示出来了,但是DropDwonList的下拉框是被隐藏 ...