/* * Example of a QFN package (and general construction site to experiment with * fped features during development) * * Everything you see here is likely to change sooner or later. * * http://www.nxp.com/acrobat/packages/footprint/SOT616-1_fp_reflow.pdf */ frame pad_up { c: vec @(-D/2, 0mm) o: vec c(D, C) set pad = n+1 pad "$pad" c . } frame pads { loop n = 0, N/4-1 vec @(P*(n-(N/4-1)/2), -Ay/2) frame pad_up . } part "qfn" set N = 24 /* * Note that this table is not a great example because it contains lots of * fields we don't really need for iterations. But it's useful for driving * the GUI to extremes. */ table { P, Ax, Ay, Bx, By, C, D, SLx, SLy, SPx_tot, SPy_tot, SPx, SPy, Gx, Gy, Hx, Hy } { 0.5mm, 5mm, 5mm, 3.2mm, 3.2mm, 0.9mm, 0.24mm, 2.1mm, 2.1mm, 1.2mm, 1.2mm, 0.45mm, 0.45mm, 4.3mm, 4.3mm, 5.25mm, 5.25mm } h_x0y0: vec @(-Hx/2, -Hy/2) h_x1y1: vec .(Hx, Hy) rect h_x0y0 h_x1y1 8mil /* * we can't draw the package outline on the silk screen for it would print * over the pads. */ #if 0 g_x0y0: vec @(-Gx/2, -Gy/2) g_x1y1: vec .(Gx, Gy) #endif frame pads @ // ARC, just for testing c: vec @(-1mm, 1mm) r: vec c(0mm, 0.5mm) e: vec c(-0.5mm, 0mm) arc c r e 2mil r2: vec c(0mm, 0.8mm) circ c r2 5mil /* x1 = 1+2*3 x2 = (1+2)*3 x3 = 1-(2+3) */ measy pad_up.c -> pad_up.o 0.2mm