關於Protel99SE的應用
EDA是電子設計自動化(Electronic Design Automation)的縮寫,在20世紀60年代中期從計算機輔助設計(CAD)、計算機輔助製造(CAM)、計算機輔助測試(CAT)和計算機輔助工程(CAE)的概念發展而來的。下面小編準備了關於Protel99SE應用的文章,歡迎大家參考!
1、PCB快捷鍵
V+D:顯示整張圖
V+F: 顯示所有元件
X+A: 撤銷選取的元件
Ctrl+B: 底部對齊
Ctrl+T: 頂部對齊
Ctrl+L: 左對齊
Ctrl+R: 右對齊
Ctrl+H: 水平居中排列
Ctrl+V: 垂直居中排列
Ctrl+End: 找到圖中原點座標
Ctrl+Shift+H: 水平均布
Ctrl+ Shift +V: 垂直均布
Ctrl+ Shift +左鼠: 移動單個物件
按Ctrl後移動式拖動: 移動物件時,不受電氣格點限制
按Alt後移動式拖動: 移動物件時,保持垂直方向
按Shift+Alt後移動式拖動: 移動物件時,保持水平方向
2、1英尺=1000mil=25.4mm
3、PCB設計有方向元件,儘量方向一致。
4、元件標識:字元高1.2mm,寬0.2mm。
5、走線距板邊0.5mm以上,距機械開孔0.5mm以上。
6、金屬接外掛,下方禁止走線。
7、線線最小間距0.3mm。
8、最小線寬,正常0.3mm,紙質板0.4mm,鍍金邦定板0.25mm。
9、過孔(via):內徑最小0.6mm,外徑最小1.2mm。焊盤(PAD)內徑與外徑間最小距離0.3mm。
10、設定原點座標:originàset。
11、設定定位孔大小(機械開孔/焊盤孔)。
12、首先布電源線和地線,儘量寬,儘量走最短的.線,走成樹形結構。電源與地線的過孔至少2個,防止電源線和地線走成環形結構。
13、先用AutoCAD畫出邊框定位元器件位置,然後畫機械4層定位。AutoCAD生成Dxf格式檔案,然後匯入Protel99SE中。
14、各元件焊盤孔的大小比引腳直徑大0.2~0.4mm。
15、安全間距:一般板子0.254mm,較空板子0.3mm,較密貼片板子0.2~0.22mm,極少數廠家可做到0.1~0.15mm,0.1mm以下絕對禁止。
16、機械1層一般用於畫板子的邊框,機械3層一般用於畫板子的檔條等機械結構件,機械4層一般用於畫板子的標尺和註釋。
17、走線寬度:首選項一般取0.2~0.6mm,地線一般選取1mm寬度,各種電源線一般可選0.5~1mm寬度。
18、敷銅:先將安全間距暫改為0.5~1mm,清除錯誤標記,儘量用八角形而不是圓弧來包裹焊盤。
19、標註字型最小為0.2*1.2mm。兩個絲印層之間的距離最小為0.2mm。板子上走線間距至少為0.3mm,一般情況下要0.4mm以上。220V兩根線之間安全間距3.2mm以上。機械開孔至少0.5mm以上。
20、所有元件在電路板上方向要儘量一致,元件標號方向一致。
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