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[Reply #15 on:]

I'm gonna see if I can find a source for the ATMega1284P-AU, 128K memory, same pinout.
Non-stocked at Mouser looks like.

[Reply #16 on:]

I had a bit of a hunt too and havent found anything yet.

I did find this though, but yeah - no AU's.

http://www.stkcheck.com/evs/atmel/atmelheader2.asp?mfg=atmel&part=ATmega1284P

[Reply #17 on:]

-MU would work for size, beyond my capability to assemble at home tho.

[Reply #18 on:]

PU is the easiest way !

[Reply #19 on:]

You could go the PU route, gives you plenty of space to tack parts on the  back like here to make up a little system like here:
http://www.geocities.jp/arduino_diecimila/obaka/project-2/index_en.html

But its not for what I want - that's a 0.6" wide, 40 pin part.
I am after something more standalone.

Hmm - I could also see taking advantage of the wider body/longer length to make a PCB that could be loaded up with components and glued to the back of chip with just the few connections needed to connect to FTDI programmer, Xtal, caps, reset switch, to have a part that could be installed in a socket.
At the same time, I am thinking if I am going to socket it, on a board, why not just have the other parts on the board also?

Waffling, waffling ...

[Reply #20 on:]

Okay, did some designing while watching football. Should work for 1284P-PU also, with its higher memory.

The idea is that a small surface mount board is assembled, then glued to the top of a plastic dip package, and 11 connections made to the chip. All the ports & everything get wired up to the board.



ATMega644-1284_Minimalist.jpg

[Reply #21 on:]

That didn't quite paste in the way I expected, here's the PCB again.
The Green is the bottom ground layer, only has a couple of signals on it.

[Reply #22 on:]

Or get really carried away - dip part soldered to breakout board for attaching headers, with the other board glued on top with its 11 wires so it looks like an arduino functionally.

[Reply #23 on:]

Nice idea !