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自检电路设计方法？

自检电路设计方法？

浏览：57次 | 提问时间： 07-30 10:40

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3个答案

贾矜持 07-30 10:41

你好，  A.创建网络表
                          1.网络表是原理图与PCB的接口文件，PCB设计人员应根据所用的原理图和PCB设计工具的特性，选用正确的网络表格式，创建符合要求的网络表。
                          2.创建网络表的过程中，应根据原理图设计工具的特性，积极协助原理图设计者排除错误。保证网络表的正确性和完整性。
                          3.确定器件的封装（PCB  FOOTPRINT）．
4.创建PCB板  根据单板结构图或对应的标准板框,创建PCB设计文件；
注意正确选定单板坐标原点的位置，原点的设置原则：
A.单板左边和下边的延长线交汇点。
B.单板左下角的第一个焊盘。
板框四周倒圆角，倒角半径5mm。特殊情况参考结构设计要求。
B.布局
1.根据结构图设置板框尺寸，按结构要素布置安装孔、接插件等需要*的器件，并给这些器件赋予不可移动属性。按工艺设计规范的要求进行尺寸标注。
2.根据结构图和生产*时所须的夹持边设置印制板的禁止布线区、禁止布局区域。根据某些元件的特殊要求，设置禁止布线区。
3.综合考虑PCB性能和*的效率选择*流程。
*工艺的优选顺序为：元件面单面贴装——元件面贴、插混装（元件面插装焊接面贴装一次波峰成型）——双面贴装——元件面贴插混装、焊接面贴装。

年深日久 07-30 10:49

自检不一定可以达到你所要的结果，比如说数码管你自检是想测试数码管的好坏？你这个自检有必要吗，好比说是显示全8这个也没有什么意义啊。除非是可以检测你需要显示的内容为乱码还是数码管坏了。这样倒是有点意义

看穿 07-30 10:58

为了保证电路正常工作和及时发现系统故障，电路设计中大多数要设计自检电路，自检电路包括对器件工作状态，环境补偿，保护元件是否失效，修正参数等等，单片机电路还包括程序是正常执行，初始参数的自动设置，有LED显示的还要检测是否断笔，以及配合人工通过显示确定系统状态等

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