PRINTED CIRCUIT BOARDS LAYOUT SPECIFICATION - Read
PRINTED CIRCUIT BOARDS LAYOUT SPECIFICATION - Read
PRINTED CIRCUIT BOARDS LAYOUT SPECIFICATION - Read
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MITAC <strong>SPECIFICATION</strong> SC830215321021 R07C<br />
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FIDUCIAL 為 DOT 形狀,直徑 40mil<br />
SOLDER MASK,正方形,邊長 120mil<br />
Silk Screen 作正方形外框,框線邊長<br />
120mil,線寬 8mil。<br />
在SOLDER-MASK 範圍內不可㈲任何TRACE,SILKSCREEN及VIA,並且<br />
在㆘㆒層之相同位置必須為空白或全部銅箔。<br />
18.2. FIDUCIAL MARK 之位置,必須與 SMC 零件同㆒面,(㆒般為零件面),如<br />
為雙面 SMC 板,則雙面亦須作 FIDUCIAL MARK。<br />
18.2.1. 放在 SMC 板㆕角落,DOT 邊緣距離板邊至少 4.4mm (0.173〞)<br />
0.173”min.<br />
0.173”min.<br />
--38--<br />
0.173”min.<br />
0.173”min.<br />
注意:㆕個 FIDUCIAL㆗心之X,Y軸不可在同㆒直線㆖,亦即㆕個㆗心點所形<br />
成之㆕邊不可為㆕方形,長方形,或梯形。<br />
18.2.2. 腳距為 0.8mm,25mil,0.65mm 或更小者之 QFP LAND PATTERN 如 10.5.5<br />
節所述,於兩對角處各作㆒個定位點〝█〞。<br />
18.3. 依板子前進方向之左㆘角之 FIDUCIAL 需於 SILK SCREEN ㆖作㆒雙線㆕方<br />
形框,如㆘圖,該內框距 FIDUCIAL 0.100〞,線寬 10mil,此表示該 FIDUCIAL
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