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open source GPIB adapter

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dorkshoei:

--- Quote from: Kean on November 30, 2021, 12:35:31 pm ---Almost 15k pcs (TQFP) expected to be available for direct purchase in March (I don't put much trust in their stock levels or ETA dates though)
https://www.microchipdirect.com/product/ATMEGA32U4-AUR

--- End quote ---

DigiKey now has some stock https://www.digikey.com/en/products/detail/ATMEGA32U4-AUR/ATMEGA32U4-AURCT-ND/3440960

Which is good as some of the brokers have started to take the piss :D https://www.win-source.net/hot-sales-and-eol-components-atmega32u4-au.html

PioB:
As the TQFP Atmega32U4 is unavailable(but there are some qfn around, hope they'll be left when I submit my next order :-DD) , I have _started_ copying @xyphros https://github.com/xyphro/UsbGpib schematic into Kicad and started with a layout. I think I need to redo it and put the MCU on the back side as the routing of the GPIB connector is a mess....



I attached the KiCAD 6 project, will try and get around to improving it soon, but not tonight anymore  :=\

PioB:
Oh i just saw, I forgot to connect the VBus Pin of the MCU to 5 V...  I quickly rectified that, not that the routing is any more beautiful now...
File added
USB-GPIB adapter copied from xyphro's schematic, for the QFN Atmega32U4, a 6x3.5 mm Crystal and Wuerth MicroUSB.
If anyone has any hints for improving the layout, I'm all ears :)

I added the step files for the USB connector and the GPIB connector to the zip, they need to be added to the footprint, as I have saved and linked them locally in my 3d model directory...

Venturi962:
Thanks for the head start, reworked VBus, caps and some signal lines.

Edit: Made some more updates. 

Hardware Notes:

* Schematic has 100nF Caps for the Crystal, original has 22pF

* Switched to more common Crystal size
* Prefer through-hole pin headers as opposed to SMD

Gribo:
You might want to add some ESD protection diodes on the USB lines.
The QFN pad could use a symmetrical via arrangement. You don't want voids when soldering it.
Edit: The VBus trace should be thicker.

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