ATMEL Mega1284P evaluation board avalible

.. do the smd parts (e.g. c2 r2) below the IC socket fit without touching the plastic socket's diagonal frame? P.

The SMD parts do look a bit too close on that.

There will be no diagonal frame, just socket strips. I'll see if the parts can be moved in a little.

.. so you are not going to use the standard dil40 machine (precision) socket?

No, being in the US, I was thinking more like this, comparable design, less expensive.
http://www.dipmicro.com/store/index.php?act=viewProd&productCode=HDR40X1FM

Course if one had a bare board one could populate as desired. Take a frame and cut the middle span for example.

I like the look of these, just gets kind of pricey to use 40 - becomes a $6 socket!
http://www.dipmicro.com/store/0552-2-15-01-11-27-10-0

Pito,
I think you recommende a cap on the 32K crystal - any value recommened there?

http://datasheets.maxim-ic.com/en/ds/DS1307.pdf

Crap. Just discovered that the 20mm battery holder (CR2032) I used from the Sparkfun library is not actually carried by Sparkfun.

Anyone seen either of these in the Eagle Library?
http://www.dipmicro.com/store/BH120591-1
http://www.dipmicro.com/store/BH2025

Thanks
Robert

Those machined headers will probably do fine for the chip although I have never seen them used that way before
EDIT: Just tested on one, seems to work quite well actually.

Crap. Just discovered that the 20mm battery holder (CR2032) I used from the Sparkfun library is not actually carried by Sparkfun.

Anyone seen either of these in the Eagle Library?
Plastic Battery Holder 1-cell ø20mm PC 120591-1 - dipmicro electronics
Coin Battery Holder ø 20mm (CR2025, CR2032) Top Load - dipmicro electronics

Sounds like a job for EAGLE part making :smiley:

I'll take a look through the libraries I have later and see if anything matches up but it would almost be faster to make a part.

Well, faster for someone more experienced than me! I kind of bumble along, having only done 1 so far. Learned a lot about eagle doing it, but by no means was it a speedy process.

I use the machine header strips all the time. A large # of what I have built so far has used those as a socket for a Promini's, with pins installed in the promini. Dipmicro has the too.

here's one I prepared earlier

if you want any mods just let me know

but it does seem to match the data sheet I found (TYCO 120591-1)

LINK REMOVED AS THE LIBRARY WAS INCORRECT

see post #203 for library Mk II

added link to data sheet

MMCP42, what's the part number for that? I was just about to place an order from Digikey and I can grab one of those for Crossroads to play with.

Well it's two pads either 20 or 26.92mm apart for the ones CrossRoads posted... I wouldn't bother with an actual part atm :smiley:

skyjumper:
MMCP42, what's the part number for that? I was just about to place an order from Digikey and I can grab one of those for Crossroads to play with.

it's the tyco 120591-1

120591-1

Thanks! $2.19 each at Digikey in small quantity, in stock.

:slight_smile:

Thanks guys! Will update my layout tonight. Think I just have 1 or 2 parts left to confirm as being purchasable & I will be ordering material & PCBs.
Figure out solder strategy & template, etc next.

Well, it was an ugly routing to fit those pins, but I got it in!

Looks to me that the 2 top pins are the +/- from the battery and the bottom pin is not connected; the symbol is not marked like that.

Which is that correct? Hopefully the electrical connections as that's what I worked in 8)

'fraid not
the 2 pins at one end are PLUS, the one pin at t'other end is MINUS

reference document

Yeah, only a single pin for +, the diagrams are confusing where they show two pins as is splits into two to contact the battery.

Can you fix the footprint to match? I had to show both ends of the battery connected to the RTC's Vbat pin on the schematic to get eagle to let me connect them together, and kludge a via and overlapping wires over the other pin to get it grounded.
Thanks!
Robert