Mail Archives: geda-user/2012/05/24/04:37:47
I am using a modified QFN16_EP footprint (QFN16 with pad). I modified
the QFN_EP footprint that came with the gEDA library so that the pad is
not absolutely square, enabling me to rotate the whole footprint without
trouble (this avoids the well-known PCB problem with rotation). The way
I have created this footprint the pad shows up as pin 17.
I am using a slotted symbol for the HFA3127 transistor array (QFN16).
The symbol has five slots, but did not mention the pad (pin 17)
initially. In PCB, after importing the netlist, I connected the pad to
a ground plane with nine thermal vias. PCB warned me that pin 17 was
shorted to ground. I tried entering 'net = GND :17' statement in the
symbol, but gschem claimed it read some garbage in the symbol for the
HFA3127. I even listed pin 17 in each slot, but still gschem claimed it
read some garbage in the same symbol.
I can certainly live with PCB's warning about the "short" between the
pad and ground, but I would like to make it go away. Since my schematic
is cluttered, I do not want to bring pin 17 into every slot. It seems
that gschem's documentation on the 'net' feature (at least the one I
accessed) is ancient and perhaps out of date. Can anybody shed some
light about how to use hidden pins in symbols with slots?
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