Comments (3)
This is a contentious issue.
- As Atmel wrote in his DS: "NOTE: Bottom pad should be soldered to ground.". Neither "must be", nor "have to be" only "should be". IMO this is a suggestion only.
- Bottom pad hasn't pad number nor name, so how to represent something that "electrically doesn't exist"?
- The QFN bottom pad can be connected to the GND net through static assignment in footprint.
from kicad-library.
1: maybe
2: Give it a number that is guaranteed to be unused ( last normal pad # + 1 - e.g. "33" for QFN32 ), as is done in [SMD_Packages:QFN32]. Some of these 'official' footprints are named e.g. "QFN48" (no pad) or "QFN48+1" (with pad). What is the harm of representing the extra pad in the symbol?
3: Yes, I can assign a net name. But every time I re-read the netlist that assignment goes away.
from kicad-library.
- OK. Let the designer decide. When
atmel.lib
will be adjusted to KLC rules I will try to suggest to include bottom pad. QFN-xx-1EP
footprints has this pad numbered as n+1.- Like in 1. Let the designer decide, when we give him a choice.
from kicad-library.
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