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1) BEGIN LAYER-----Thermal Relief Pad和Anti Pad比实际焊盘做大0.5mm/20mil- r* N/ m7 J3 I, `# Z) ^
2)END LAYER与BEGIN LAYER一样设置4 @" x6 `5 `- x9 M H
2)DEFAULT INTERNAL尺寸如下0 e, ^" v) A0 D
其中尺寸如下:) z. C; u9 J$ s4 U, y( C5 D
DRILL_SIZE >= PHYSICAL_PIN_SIZE + 0.25mm/10MIL
( J+ L+ V8 b8 B2 P4 nRegular Pad >= DRILL_SIZE + 0.4mm/16MIL (DRILL_SIZE<1.27mm/50mil) Regular Pad >= DRILL_SIZE +0.76mm/ 30MIL (DRILL_SIZE>=1.27mm/50mil)
4 H% D. k2 c: E+ W4 Y, D0 iRegular Pad >= DRILL_SIZE + 1mm/40MIL (钻孔为矩形或椭圆形时)(1mm)
J6 c7 Q; ^8 Z' s5 h+ d1 pThermal Pad = TRaXbXc-d其中TRaXbXc-d为Flash的名称(后面有介绍)4 i, S `4 d, _) ]$ G
Anti Pad = DRILL_SIZE + 0.76mm /30MIL
( W, Q( s- M/ g. PSOLDERMASK = Regular_Pad + 0.15mm /6MIL 5 }0 ]4 m& k& {& G1 e* N
PASTEMASK = Regular Pad (可以不要)
* ~$ h7 ~5 p; x9 C•Flash Name: TRaXbXc-d
5 o5 D$ i- I6 @! Z8 f! U其中:( L, \; |, m- n2 `9 d
a. Inner Diameter: Drill Size + 0.5mm/16MIL
D5 g" g3 ?, n9 f& zb. Outer Diameter: Drill Size + 0.76mm/30MIL6 } \- i: E; H2 r
c. spokes:
+ t7 K7 `: t/ T* o0.3mm/12mil (当DRILL_SIZE = 10MIL/0.25mm以下)( t4 V M9 z4 _! @$ d
0.4mm/15mil (当DRILL_SIZE = 11~40MIL/0.28mm~1mm)1 I$ ^- N& _# i7 L
0.5mm/20mil (当DRILL_SIZE = 41~70MIL/1mm~1.8mm)
* h$ H1 u i7 W3 j. M0.76mm/30mil (当DRILL_SIZE = 71~170 MIL/1.8mm~4.3mm)& G k/ X; G: ^& W5 R
1.0mm/ 40mil (当DRILL_SIZE = 171 MIL/4.3mm以上)# ~& ?# Y: u! @$ r
也有这种说法:至于flash的开口宽度,则要根据圆周率计算一下,保证连接处的宽度不小于0.25mm/10mil。2 [# q# Q5 c: a5 ` m8 H- p
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