I'm planning on using a Mega328 for my next project, but the datasheet is a little unclear on land patterns. There seems to be some vagueness about MLFs and QFNs, with the datasheet saying that the chip comes in both packages (and the one I found on Farnell is a QFN - so I'm running with it) but only has a pattern for a 28QFN and not the 32 that the pinout says.
I emailed Atmel who just directed me to the same datasheet without much explanation.
Somewhere I read that they use QFN/MLF interchangably, but from the chips i've seen visually they're normally different (qfn = square, mlf = rounded square with tapering sides). The Eagle packages I've found so far = including SparkFun's - (I was going to make my own based on actually looking at the chip I get sent in the post if this doesn't get sorted out :)) don't have a centre ground pad which is a little odd too.
Anyway, figured before I bought some chips I might see if anyone else has used the QFN/MLF and which pattern they used?