byuu's message board

For discussion of projects related to www.byuu.org/


Previous  1, 2, 3  Next
TSOP-to-SOIC breakout 
Author Message

Joined: Fri 10 Apr 2009, 15:00:08

Posts: 13668
Post Re: TSOP-to-SOIC breakout
Shoot :(

At any rate, I appreciated your continued work and dedication on this. It will really be a massive help to have this Cx4 dev board. I do intend to improve my Cx4 emulation as much as possible with it.

That said, I'm afraid I can't afford another RMX2 at this moment. I just picked up the second rarest SFC game ever made, and it's pretty much broken my bank account again. (Sad as it is to say it, it's actually a good time for the extreme SFC dry spell going on at the moment.)

So we may have to put this off for a bit.

Mon 01 Jul 2013, 07:03:30
User avatar

Joined: Sat 01 Dec 2012, 01:50:23

Posts: 240
Location: Oregon, USA
Post Re: TSOP-to-SOIC breakout
I'll try to dead-bug the board. All is not lost just yet. It's just going to look like crap :P I was really hoping to do a better job than the average rats-nest repro cart you see online... oh well...

Mon 01 Jul 2013, 08:23:32

Joined: Fri 10 Apr 2009, 15:00:08

Posts: 13668
Post Re: TSOP-to-SOIC breakout
I don't know what dead-bug means, but it doesn't sound endearing :/

Would need this board to stand as much of the test of time as possible. So if you'd be up for it, I'd still like to get a clean board done, but perhaps at a later date when finances are more favorable ... of course, if you weren't up for that, I'd understand.

Mon 01 Jul 2013, 08:45:43

Joined: Sat 16 Feb 2013, 07:04:31

Posts: 179
Location: Arizona
Post Re: TSOP-to-SOIC breakout
Dead-bugging usually refers to wiring a chip upside down, with the pins sticking up like the legs on a dead bug.
Something like this:
Image

Mon 01 Jul 2013, 19:58:35
User avatar

Joined: Sat 01 Dec 2012, 01:50:23

Posts: 240
Location: Oregon, USA
Post Re: TSOP-to-SOIC breakout
Yep, that's basically the idea, except it will be the entire daughterboard upside-down rather than the bare chip, since a 0.5mm-pitched TSOP is a bit too fine for "true" dead-bugging. However, I've also seen the term used to describe how wires look when attached to smd footprints like this, because the wires themselves then resemble the legs of a smashed insect.

Image

As for durability, the solder-joints themselves will be just as solid as normal, it's just that the daughterboard will be "floating" suspended by wires. I can always encase the whole thing in hot glue once all of the continuity testing is done and it should be perfectly solid, it'll just look ugly. It's worth a shot, considering what you paid for the cart, but if you want to try again later, that's always an option too.

Mon 01 Jul 2013, 20:15:47

Joined: Thu 02 Jun 2011, 01:36:41

Posts: 380
Location: Oklahoma, USA
Post Re: TSOP-to-SOIC breakout
I don't know how badly you damaged the pads, but removing the whole adapter and wiring it like that seems excessive. You should be able to take 30awg wire and just do jumpers to connect where the damaged pads go. I've had to do all kinds of scary rework wiring over the years on prototype boards I've built for people, so I'm pretty used to it.

Mon 01 Jul 2013, 22:21:30
User avatar

Joined: Sat 01 Dec 2012, 01:50:23

Posts: 240
Location: Oregon, USA
Post Re: TSOP-to-SOIC breakout
Unfortunately, if I want to wire any of the pads, I'll have to wire them all. I was trying something a bit weird, direct board-to-board, pad-to-pad soldering (think of the adapter board as a giant QFN chip on the bottom, with the TSOP footprint on top), so there's no way to attach the wires to the damaged pads, because they'll be sandwiched between the two boards, and the wires will create space between the boards, making the other pads no longer make proper contact... but 40 wires probably shouldn't be too bad...

Tue 02 Jul 2013, 08:42:23
User avatar

Joined: Sat 01 Dec 2012, 01:50:23

Posts: 240
Location: Oregon, USA
Post Re: TSOP-to-SOIC breakout
I'll have to tap the remaining 4 wires directly off of the Cx4 pins, but I think the rest are good to go. Needs a healthy slab of hot glue, but the solder joints are good.

Image

Sun 07 Jul 2013, 03:47:55
User avatar

Joined: Sat 01 Dec 2012, 01:50:23

Posts: 240
Location: Oregon, USA
Post Re: TSOP-to-SOIC breakout
Reports of my death may have been slightly exaggerated :P

I decided to just bite the bullet and try putting edge castellations on the board just to see how they'd turn out, and they came out great! They're hard to see in the photo, but they came out clean, no burrs or milling problems.

Image

New donor board assembled, and it went soooo much better than the original boards without the castellations.

Image

Now, I just need to program the ROM and then I'll get that put on there. Then, I can test out the on-board programming and hopefully we'll be in business.


qwertymodo


Sat 19 Oct 2013, 07:04:53
User avatar

Joined: Mon 20 Apr 2009, 08:11:50

Posts: 5266
Location: 日本
Post Re: TSOP-to-SOIC breakout
Nice work, mate! It looks really professional!

_________________
CaptainJistuce: He's totally in the wrong, Kakashi's 100% in the right.
Note: The above statement is subject to act of byuu.

Sat 19 Oct 2013, 07:08:07

Joined: Fri 10 Apr 2009, 15:00:08

Posts: 13668
Post Re: TSOP-to-SOIC breakout
Oh yeah, that looks amazing. Really looking forward to this! Thanks for the continuing efforts :D

Sat 19 Oct 2013, 07:26:04
User avatar

Joined: Sat 01 Dec 2012, 01:50:23

Posts: 240
Location: Oregon, USA
Post Re: TSOP-to-SOIC breakout
Hopefully I can work done more on this soon. School is going well, and I may finally have gotten a job, so that's a lot of stress gone. The issue now is that my workbench is buried under piles of boxes since the basement is being used for storage. If I can get that fixed up, no power in the 'verse can stop me :P

Sat 19 Oct 2013, 21:37:01

Joined: Fri 10 Apr 2009, 22:30:48

Posts: 3797
Location: Salem, Oregon
Post Re: TSOP-to-SOIC breakout
yeah, that looks slick as hell.

_________________
Krita Kickstarter -- https://www.kickstarter.com/projects/kr ... erate-deve

Sat 26 Oct 2013, 04:01:30
User avatar

Joined: Sat 01 Dec 2012, 01:50:23

Posts: 240
Location: Oregon, USA
Post Re: TSOP-to-SOIC breakout
Finally getting around to rebuilding the workbench in the basement. The bench is basically rebuilt, now I just need to add power and a grounding block, and I'll be up and running. Getting there...

The photo really doesn't do it justice, but there's tons of space. For reference, the shelf is 16" deep by 7' wide, and the anti-static mat is 2'x3'

Image

Mon 28 Oct 2013, 07:16:03
User avatar

Joined: Mon 20 Apr 2009, 08:11:50

Posts: 5266
Location: 日本
Post Re: TSOP-to-SOIC breakout
Is that water damage on the floor?

_________________
CaptainJistuce: He's totally in the wrong, Kakashi's 100% in the right.
Note: The above statement is subject to act of byuu.

Mon 28 Oct 2013, 10:51:21
Previous  1, 2, 3  Next

Who is online

Users browsing this forum: No registered users and 0 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum