TQFP 44-pin PCB layout

Go To Last Post
10 posts / 0 new
Author
Message
#1
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Hi !

 

I need to draw PCB layout for ATmega324 uC and that is TQFP 44-pin.

 

I'm working with an archaic program PROTEL 99 which doesn't have this layout.

 

What I've found is 

http://www.controlchips.com/qfp44dim.htm

 

I think this is OK.

 

Does ATMEL have some .pdf-s of recommended layouts for their chips?

 

 

Thank you !

Regards !

 

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

The layouts for their devices is located towards the end of the datasheet(s) for the deice(s).  Datasheets are in .PDF

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I'm working with an archaic program PROTEL 99

Hey wash your mouth...  that was the last of the good Protel stuff. wink

 

I have used the TQFP 44 with Autotrax but I had to make my own component. Don't know if I can just export the component but I can give you a bit of PCB with the TQFP 44 on it which you should be able to import into SE.

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

Last Edited: Fri. Nov 14, 2014 - 08:55 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Two minutes with Google ...

http://www.mikrocontroller.net/t...

In meiner Library habe ich unter anderen:

TQFP-44 (10x10x1) (z.B. fuer PIC18F4620)
TQFP-64 (10x10x1)
TQFP-64 (16x16x1)-0.8 (z.B. fuer ATMEGA 128)
TQFP-80 (12x12x1) (z.B. fuer PIC18F8722)
TQFP-100 (14x14x1) SOT-386-1)

Hopefully the PIC and AVR have the same footprint?

 

Also http://www.avrvi.com/avr_protel_... and http://bbs.ednchina.com/FORUM_PO... and others...

 

 

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

jgmdesign wrote:

The layouts for their devices is located towards the end of the datasheet(s) for the deice(s).  Datasheets are in .PDF

 

yes of course, but these are physical dimensions of chips. PCB layout should be a bit or two grater then given dimensions, like this one on last page:

 

http://docs-europe.electrocomponents.com/webdocs/121b/0900766b8121b405.pdf

 

 

I've designed at least 25 PCBs (you have probably done more then me) and all of them were soldered by hand, but I haven't use this package before and current design is going to be soldered by machine. So I think it might be a problem for positioning/soldering if I make layout for chip on my own way like I did it up till now (longer/wider pads..) 

 

I think I've found what I was looking for :

 

http://www.maximintegrated.com/en/design/packaging/index.mvp?a=0&f=

 

http://pdfserv.maximintegrated.com/package_dwgs/21-0293.PDF

 

http://pdfserv.maximintegrated.com/land_patterns/90-0316.PDF

 

 

 

Shame that ATMEL doesn't have this  crying

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Shame that ATMEL doesn't have this

Did you look at section 33. Packaging Information on the datasheet? I thought you wanted a ready made footprint not a PDF of the footprint.

 

 

 

 

 

 

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

js wrote:

Shame that ATMEL doesn't have this

Did you look at section 33. Packaging Information on the datasheet? I thought you wanted a ready made footprint not a PDF of the footprint.

 

Yes of course I had a look.

 

If  I've had a PDF of the footprint, than there's no problem to draw it wink

 

 

Thank you guys ! 

 

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

xtal_88 wrote:
... all of them were soldered by hand, but I haven't use this package before and current design is going to be soldered by machine. So I think it might be a problem for positioning/soldering if I make layout for chip on my own way like I did it up till now (longer/wider pads..) 

Is this reflow, or wave soldering ?

I think ~ 0.8mm is where wave soldering can push to, and usually needs extended fingers and 45' rotation.

I've also seen solder thieves (extra pads) sometimes added for wave soldering.

 

If it is reflow, then a standard footprint should be fine, even one extended a little for hand soldering.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

The Atmel Mega/Tiny footprints, unlike a few manufacturers, appear to be JEDEC standard. Thus, you should be able to use a footprint from another device that is also JEDEC standard. 

 

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Still using Protel 99SE Service Pack 6 once in a while...

QFP footprint libraries attached.

YW

Attachment(s): 

while(!solution) {patience--;}