关于Protel99SE的应用
EDA是电子设计自动化(Electronic Design Automation)的缩写,在20世纪60年代中期从计算机辅助设计(CAD)、计算机辅助制造(CAM)、计算机辅助测试(CAT)和计算机辅助工程(CAE)的概念发展而来的。下面小编准备了关于Protel99SE应用的文章,欢迎大家参考!
1、PCB快捷键
V+D:显示整张图
V+F: 显示所有元件
X+A: 撤销选取的元件
Ctrl+B: 底部对齐
Ctrl+T: 顶部对齐
Ctrl+L: 左对齐
Ctrl+R: 右对齐
Ctrl+H: 水平居中排列
Ctrl+V: 垂直居中排列
Ctrl+End: 找到图中原点坐标
Ctrl+Shift+H: 水平均布
Ctrl+ Shift +V: 垂直均布
Ctrl+ Shift +左鼠: 移动单个对象
按Ctrl后移动式拖动: 移动对象时,不受电气格点限制
按Alt后移动式拖动: 移动对象时,保持垂直方向
按Shift+Alt后移动式拖动: 移动对象时,保持水平方向
2、1英尺=1000mil=25.4mm
3、PCB设计有方向元件,尽量方向一致。
4、元件标识:字符高1.2mm,宽0.2mm。
5、走线距板边0.5mm以上,距机械开孔0.5mm以上。
6、金属接插件,下方禁止走线。
7、线线最小间距0.3mm。
8、最小线宽,正常0.3mm,纸质板0.4mm,镀金邦定板0.25mm。
9、过孔(via):内径最小0.6mm,外径最小1.2mm。焊盘(PAD)内径与外径间最小距离0.3mm。
10、设定原点坐标:originàset。
11、设置定位孔大小(机械开孔/焊盘孔)。
12、首先布电源线和地线,尽量宽,尽量走最短的.线,走成树形结构。电源与地线的过孔至少2个,防止电源线和地线走成环形结构。
13、先用AutoCAD画出边框定位元器件位置,然后画机械4层定位。AutoCAD生成Dxf格式文件,然后导入Protel99SE中。
14、各元件焊盘孔的大小比引脚直径大0.2~0.4mm。
15、安全间距:一般板子0.254mm,较空板子0.3mm,较密贴片板子0.2~0.22mm,极少数厂家可做到0.1~0.15mm,0.1mm以下绝对禁止。
16、机械1层一般用于画板子的边框,机械3层一般用于画板子的档条等机械结构件,机械4层一般用于画板子的标尺和注释。
17、走线宽度:首选项一般取0.2~0.6mm,地线一般选取1mm宽度,各种电源线一般可选0.5~1mm宽度。
18、敷铜:先将安全间距暂改为0.5~1mm,清除错误标记,尽量用八角形而不是圆弧来包裹焊盘。
19、标注字体最小为0.2*1.2mm。两个丝印层之间的距离最小为0.2mm。板子上走线间距至少为0.3mm,一般情况下要0.4mm以上。220V两根线之间安全间距3.2mm以上。机械开孔至少0.5mm以上。
20、所有元件在电路板上方向要尽量一致,元件标号方向一致。
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