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Guild: wafer.space Community
Channel: 📐 - Designing / 📦-cob
Topic: Channel for discussing chip-on-board packaging options for wafer.space bare die.
After: 2026-01-31 11:59 p.m.
Before: 2026-03-01 12:00 a.m.
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[2026-02-08 10:21 p.m.] logic_destroyer
crazy

https://x.com/matthewvenn/status/2020521149713600550

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Matthew Venn (@matthewvenn)
https://twitter.com/matthewvenn/status/2020521149713600550
I'm with @Zeptobars and we're going to try a FIB \(focused ion beam\) edit on a @tinytapeout chip\.

Here's the incredible machine that can do it\.\.\.
2026-02_media/HApVIsibkAAEfBg-6F432.jpg%3Alarge
X

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[2026-02-16 2:15 a.m.] arabidsquid
Hey, so I was making a bunch of add-on boards for the upcoming next version of [Barnacle Board](https://github.com/Architeuthis-Flux/Barnacle_Board) and figured I'd make one that maps your 70 pin mezzanine connector to a breadboard. 
Before I finish routing (and adding labels for the COB pads), I figured I should ask y'all some stuff:
- Do you even want this? 
- How likely is it that you want `VDD_CORE`, `VDD_IO`, and `PWR_AUX` separate?
- What do you generally do with `PWR_AUX`?
- Is there anything you can think of that would make this more awesome?

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2026-02_media/Screenshot_2026-02-15_at_6.00.03_PM-11DCF.png

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[2026-02-16 2:19 a.m.] anfroholic
Awesome!!

> Do you even want this?
Not sure, but it looks super cool!!

> How likely is it that you want VDD_CORE, VDD_IO, and PWR_AUX separate?
This was a spec pulled from Tiny Tapeout. Currently they have them all bridged on the die, but that may change in the future. Use your own judgement here. 

> What do you generally do with PWR_AUX?
Again, this is likely more power pins than a *regular* design would need. We needed a standard and they had the most robust needs and had the most documentation, so that's how we ended up here. 

> Is there anything you can think of that would make this more awesome?
Artwork! 😉 

Looks great though. Super cool, thanks for sharing!

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[2026-02-16 2:23 a.m.] arabidsquid
What do you mean, I do have artwork on there. jk I'll definitely add some

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[2026-02-16 2:23 a.m.] anfroholic
The whole board is a piece of art. It looks great!

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[2026-02-16 2:24 a.m.] arabidsquid
Thanks for that, so I can treat all those power pins as a single node?


[2026-02-16 2:28 a.m.] anfroholic
We're still working to harden the standard. 
This will likely come sometime after the first run is complete. 
I designed a couple tests. 
https://kicanvas.org/?repo=https%3A%2F%2Fgithub.com%2Fwafer-space%2Fchip-on-board-wire-bonded-pcbs%2Ftree%2Fmain%2Fscratch%2Fmotherboards%2Fmotherboards

https://github.com/wafer-space/chip-on-board-wire-bonded-pcbs/tree/main/scratch/motherboards/motherboards
It looks like I did **Not** bridge them.

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https://github.com/wafer-space/chip-on-board-wire-bonded-pcbs/tree/main/scratch/motherboards/motherboards
chip-on-board-wire-bonded-pcbs/scratch/motherboards/motherboards at...
Wire bonded chip on board PCB designs. Contribute to wafer-space/chip-on-board-wire-bonded-pcbs development by creating an account on GitHub.
2026-02_media/chip-on-board-wire-bonded-pcbs-66450


[2026-02-16 2:29 a.m.] anfroholic
Really I have no idea what others have done. 
Getting a concensus on what people actually *did* would be good


[2026-02-16 2:30 a.m.] anfroholic
And when I say I did not bridge them, I mean VDD_IO <==> VDD_CORE 
The ones on the same nets are bridged

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[2026-02-16 2:33 a.m.] arabidsquid
Legit. That's good news because it can fit on a half size breadboard that way.

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[2026-02-16 2:36 a.m.] arabidsquid
And eventually you'll be able to plug these into a [Jumperless](https://jumperless.org/) crossbar matrix for some automated testing or whatever

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https://jumperless.org/
Home - Jumperless Docs
Learn how to use your Jumperless
2026-02_media/ExplodraftWords-3C48D.png

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[2026-02-16 2:36 a.m.] anfroholic
Sweet! I recongnized one of those from your pic above

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[2026-02-16 2:47 p.m.] tholin
Hmmmm...

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[2026-02-16 2:49 p.m.] anfroholic
Awesome!
Are the dipswitches for project selection on your multiproject die?


[2026-02-16 2:50 p.m.] tholin
Yes

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[2026-02-16 4:07 p.m.] tholin
And mezzanine version, which I’d actually prefer

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[2026-02-16 5:59 p.m.] arabidsquid
Oh sick, which pads did you use for project selection? and is there any consensus on that? (I'm guessing no)


[2026-02-16 6:26 p.m.] tholin
No, no consensus


[2026-02-17 10:02 p.m.] mithro_
@Architeuthis Flux - So you going to give creating a custom replacement for your analog muxes a go on the next wafer.space run?


[2026-02-17 10:03 p.m.] mithro_
@Architeuthis Flux - It might be worth chatting with @peterkinget and the MOSBius team, they kind of already doing something in the same type of category.


[2026-02-17 10:07 p.m.] arabidsquid
Yeah, I'm definitely toying with that idea.


[2026-02-17 10:09 p.m.] arabidsquid
Yeah I watched that stream you did a few months ago, super rad. I've been meaning to hit you up @peterkinget and chat.


[2026-02-27 9:07 p.m.] egorxe
@Andrew Wingate Which glue is planned to be used to glue the die to the cob, the conductive or non-conductive type? I guess it's conductive so the die bulk will be grounded, right?


[2026-02-27 9:30 p.m.] anfroholic
This is something that's a little outside my expertise. 
Part of me says there seems to be little reason why we would have anything other than conductive, so would imagine that would be what we ask for. 
I also imagine we can have whatever we ask for. 

Is there anyone out there who feels strongly either way?
@Tim 'mithro' Ansell


[2026-02-27 9:47 p.m.] mithro_
@stuart - what has Tiny Tapeout been using?


[2026-02-27 9:52 p.m.] 246tnt
We use conductive epoxy.

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