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noobmuncher
Registered Member

Date Joined Mar 2008
Total Posts : 72

Posted 11/5/2009 4:52 PM (GMT -8)

Hello,

So I ordered my Propeller chips through digi key the other day and received it today. Not going to lie I was pretty excited to get started on playing around with the chip. Unfortunately when i opened the box it turns out I had mistakenly ordered the 44-Pin QFN Chip instead of the DIP version which I was planning to just slot into my breadboards and away we go. So to say the least I am pretty disappointed and honestly this is just the icing on the cake to an already horrible day, so my question is, how can I use it? Can I somehow interface it to a breadboard? or at least bigger pins that i can then run to a bread board?

Thank you!

>>>> Edited Thursday November 6th

So as you can see i changed the title of the post and was wondering if anyone had a Propeller DIP chip they would be willing to sell me for around if not slightly above market value. I would need it to get to me asap ideally by next Wednesday (Tuesday would be better). All are sold out on digikey and all the other distributors I usually use and I want to start using it over my reading week. post on the forums or email me your contact info if you have one to spare and some time to run to a ups or fed ex shipping place (or post office lol)

Thank you : )

Post Edited (noobmuncher) : 11/6/2009 7:41:13 AM GMT

James Long
Lil Brother SMT Assembly Services

Date Joined Aug 2004
Total Posts : 976

Posted 11/5/2009 5:27 PM (GMT -8)

NM,

I hate to say it, but there is not an easy solution to the situation. The QFN chip is pretty hard to do without some prior planning. It can be hand soldered, but would not be my first choice for the first timer. The center pad can be a nightmare to deal with.

I hate to say it, but if it were me (well.....if I was in your situation), I would try and see if I could sell them to someone on the forum, and try to get the DIP version.

Working with the QFN and not having a breakout board is asking to create a huge headache......and will probably just serve to make you that more frustrated.

Sorry to be the bearer of bad news, but unless you want to design a breakout board, hand them off (sell them) to someone who needs them.

James L

James L
Partner/Designer
Lil Brother SMT Assembly Services

Are you addicted to technology or Micro-controllers..... then checkout the forums at Savage Circuits. Learn to build your own Gizmos!

Post Edited (James Long) : 11/6/2009 1:33:17 AM GMT

James Long
Lil Brother SMT Assembly Services

Date Joined Aug 2004
Total Posts : 976

Posted 11/5/2009 5:31 PM (GMT -8)

How many did you order?

James L

James L
Partner/Designer
Lil Brother SMT Assembly Services

Are you addicted to technology or Micro-controllers..... then checkout the forums at Savage Circuits. Learn to build your own Gizmos!

mctrivia
Registered Member

Date Joined Jan 2009
Total Posts : 2535

Posted 11/5/2009 6:12 PM (GMT -8)

My propmodule pcb are $5 and will give you the breakout you need. It is worth the experience to try to solder them yourself but I would recommend solder past and some form of reflow oven/hot air gun.

I can solder them on for you if you like also though if your not in canada I would have to charge to cover duties.

24 bit LCD Breakout Board coming soon. $21.99 has backlight driver and touch sensitive decoder.

Leon
Registered Member

Date Joined Aug 2004
Total Posts : 2093

Posted 11/5/2009 6:37 PM (GMT -8)

I use a large via for the central pad and feed solder into it, and drag-solder the other pads.

Leon

Amateur radio callsign: G1HSM

mctrivia
Registered Member

Date Joined Jan 2009
Total Posts : 2535

Posted 11/5/2009 6:40 PM (GMT -8)

Yes it can be done that way. I have 4 large via for that purpose. Down side to my board is crystal must be soldered on the board.

24 bit LCD Breakout Board coming soon. $21.99 has backlight driver and touch sensitive decoder.

James Long
Lil Brother SMT Assembly Services

Date Joined Aug 2004
Total Posts : 976

Posted 11/5/2009 6:49 PM (GMT -8)

Leon said...
I use a large via for the central pad and feed solder into it, and drag-solder the other pads.

Leon

Leon,

Drag soldering only works if you modify the recommended footprint (extend the pads outward). If using the standard footprint, it is impossible to drag solder a QFN. Ok, maybe not impossible, but I wouldn't recommend it.

James L

James L
Partner/Designer
Lil Brother SMT Assembly Services

Are you addicted to technology or Micro-controllers..... then checkout the forums at Savage Circuits. Learn to build your own Gizmos!

noobmuncher
Registered Member

Date Joined Mar 2008
Total Posts : 72

Posted 11/5/2009 11:32 PM (GMT -8)

Okay thanks everyone. I ordered two so if anyone wants them I will gladly sell you two for the price of one (but you will have to pay shipping which will be cheap if it's just standard), but I guess I will just wait until I can get a DIP version. On that note:

IF YOU HAVE A DIP VERSION YOU ARE WILLING TO SELL (I believe that only the long ones (not the square ones) come in DIP which is good because I want that type) IT FOR AROUND $10-15 (american or canadian) and will ship it to me (price I just said doesn't include shipping which i will pay on top of that) so that i receive it before next Wednesday I will gladly do so and then praise you for this act of charity after lol.

Thank you :)

Leon
Registered Member

Date Joined Aug 2004
Total Posts : 2093

Posted 11/5/2009 11:34 PM (GMT -8)

I extend the pads for drag-soldering.

Leon

Amateur radio callsign: G1HSM

dMajo
Italy 72

Date Joined Apr 2008
Total Posts : 329

Posted 11/6/2009 1:33 AM (GMT -8)

As I usually buy devkits and some special IC directly from the states perhaps someone is interested to try the opposite way:

http://it.rs-online.com/web/0405597.html (3 available)

http://www.artek.it/scheda_prodotto.cfm?w_cat=27&w_scat=1001&w_prd=1012

http://www.homotix.it/scheda_prodotto.cfm?w_cat=27&w_scat=1001&w_prd=1012

http://www.elettroshop.com/prodotti.asp?cid=221&act=categoria&mid=

and thanks to fisio with 10% discount from the above one:

http://www.elettronicamente.com/engine/default.asp?page=minishop&name=ES&action=viewall

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