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From the CAD Library: Padstack Naming Convention, Part 3
Wednesday, July 13, 2011 | Tom Hausherr, CID+, Mentor Graphics

Over the past two columns, we looked at padstack naming conventions, and some details. This week, I’ll finish up the topic. Let’s look at corner modifiers.

Chamfered and rounded corner modifiers are used to indicate which corners are modified. Figure 1 shows the “order of precedence” that has been given to the first four modifiers.

 

 Figure 1.

Modifiers:

bl – bottom left
br – bottom right
ul – upper left
ur – upper right
ulr – upper left & right
blr
– bottom left & right
ubl
– upper and bottom left
ubr
– upper and bottom right

Rounded and chamfered lands in “one corner” modifier examples:

r100_200rbl50 = rectangular land 1.00 x 2.00 with 0.50 radius for rounded corner in bottom left corner

r100_200rbr50 = rectangular land 1.00 x 2.00 with 0.50 radius for rounded corner in bottom right corner

r100_200rul50 = rectangular land 1.00 x 2.00 with 0.50 radius for rounded corner in upper left corner

r100_200rur50 = rectangular land 1.00 x 2.00 with 0.50 radius for rounded corner in upper right corner

r100_200cbl50 = rectangular land 1.00 x 2.00 with 0.50 chamfer for chamfer corner in bottom left corner

r100_200cbr50 = rectangular land 1.00 x 2.00 with 0.50 chamfer for chamfer corner in bottom right corner

r100_200cul50 = rectangular land 1.00 x 2.00 with 0.50 chamfer for chamfer corner in upper left corner

r100_200cur50 = rectangular land 1.00 x 2.00 with 0.50 chamfer for chamfer corner in upper right corner


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