关于STM32的UART口是否需要接上拉电阻
我主要是在《电路设计与制作实用教程----基于立创EDA》里面看到STM32的UART口还接了个上拉电阻,我不是很理解。
我去看了下正点原子的开发板的原理图,UART并没有上拉电阻。
![](https://img-blog.csdnimg.cn/20210729115528163.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2NjQzMjIz,size_16,color_FFFFFF,t_70)
![](https://img-blog.csdnimg.cn/20210729115713297.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2NjQzMjIz,size_16,color_FFFFFF,t_70)
然后我搜了下
https://www.sekorm.com/faq/19710.html?ancient=1
![](https://img-blog.csdnimg.cn/20210729115926363.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2NjQzMjIz,size_16,color_FFFFFF,t_70)
我搜了下上拉电阻的作用
https://zhidao.baidu.com/question/143287997.html
![](https://img-blog.csdnimg.cn/20210729120041495.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2NjQzMjIz,size_16,color_FFFFFF,t_70)
电阻起限流作用这种用法我也是见到多次了
拍自 《电路设计与制作实用教程----基于立创EDA》
![](https://img-blog.csdnimg.cn/20210729120559831.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2NjQzMjIz,size_16,color_FFFFFF,t_70)
https://blog.csdn.net/sinat_16643223/article/details/118721173
![](https://img-blog.csdnimg.cn/20210729120732754.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2NjQzMjIz,size_16,color_FFFFFF,t_70)
我怀疑按键这也是上拉电阻,也是起到限流作用,因为它只需要高电平。
![](https://img-blog.csdnimg.cn/20210729121903927.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2NjQzMjIz,size_16,color_FFFFFF,t_70)
而且LED电路似乎一般都会有一个限流电阻
拍自 《电路设计与制作实用教程----基于立创EDA》
![](https://img-blog.csdnimg.cn/20210729123307850.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2NjQzMjIz,size_16,color_FFFFFF,t_70)
![](https://img-blog.csdnimg.cn/2021072912332343.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2NjQzMjIz,size_16,color_FFFFFF,t_70)
![](https://img-blog.csdnimg.cn/20210729123344430.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2NjQzMjIz,size_16,color_FFFFFF,t_70)
我以前在新浪博客转载过一篇关于上拉电阻的文章
http://blog.sina.com.cn/s/blog_c0e651900102vns5.html
![](https://img-blog.csdnimg.cn/20210729124512968.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2NjQzMjIz,size_16,color_FFFFFF,t_70)
我看PWM输出也有上拉电阻
拍自《多旋翼无人飞行器嵌入式飞控开发指南》
![](https://img-blog.csdnimg.cn/20210729133716612.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2NjQzMjIz,size_16,color_FFFFFF,t_70)
我看匿名飞控的UART这里给了上拉电阻
![](https://img-blog.csdnimg.cn/20210729134500795.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2NjQzMjIz,size_16,color_FFFFFF,t_70)
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