https://github.com/hubmartin/bga_challenge_attiny20

Tiny PCB with ATtiny20 in 0.65 mm pitch BGA backage, RGB 1x1mm LEDs and 0402 passives
https://github.com/hubmartin/bga_challenge_attiny20

Last synced: about 1 month ago
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Tiny PCB with ATtiny20 in 0.65 mm pitch BGA backage, RGB 1x1mm LEDs and 0402 passives

• Host: GitHub
• URL: https://github.com/hubmartin/bga_challenge_attiny20
• Owner: hubmartin
• Created: 2020-06-03T18:00:21.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2020-06-03T18:33:40.000Z (over 4 years ago)
• Last Synced: 2024-10-28T09:35:50.525Z (3 months ago)
• Language: Shell
• Size: 601 KB
• Stars: 1
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# BGA Challenge

I wanted to improve my assembly and "cutting-edge" PCB pool technical size limits so I've designed this board in KiCAD. It's just 20 x 15 mm PCB.

Board was made with Aisler. Here is the [sharing link](https://aisler.net/p/JWEQJIAC) if you would like to manufacture PCB and stencil.

![3D view](images/3d.png)

![PCB](images/pcb.png)

![Schematics](images/schematics.png)

More info and pictures in these tweets:

- https://twitter.com/hubmartin/status/1266421947304476685

- https://twitter.com/hubmartin/status/1251945517552144384

# ATTiny20 programming

This board is using 6 pin programmer. ATTiny20 is using TPI programming (instead of ISP) where MOSI pin is bi-directional. You can use [USBasp  programmer by Thomas Fischl](https://www.fischl.de/usbasp/), make sure you have the latest version of firmware with TPI support `usbasp.2011-05-28`. I've read that chinese clones use older firmwares (11 years).

You can also use Arduino to program chip. [Bitluni has a great video about it.](https://www.youtube.com/watch?v=AL9vK_xMt4E)

# Example code

The example code is just blinking to test that you soldered everything right. The power-switch is not controlled yet, as I did not managed to solder this 2x2 BGA correctly yet.

You compile firmware with `build.sh` and flash it with `flash.sh`. Other scripts are for ATtiny204 but that's a different project.