Unified-Daughterboard/UDB-C-Legacy
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Created PCB side design resources (markdown)

ai03 2020-03-30 13:19:14 +09:00
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PCB-side-design-resources.md Normal file

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## Circuitry choices
Since the new C3 variant carries most necessary protections onboard, the main PCB can be left fairly basic.
## Cable considerations
Make sure that the cable is properly one-to-one; a cable which inverts the pinout will result in reverse voltage applied to the main PCB resulting in its destruction.
One good option for testing and low quantity boards is the Sparkfun Qwiic cables; these are confirmed functional and compatible with the Unified USB Daughterboard series.
Make sure that no components block the zone in front of the JST connector; this will risk the cable not fitting or the part(s) being destroyed when attaching the cable.
## The part
Use a 4 pin JST SH/SR series connector. A footprint can be found in my [random keyboard parts library](https://github.com/ai03-2725/random-keyboard-parts.pretty).
The pinout is as follows.
![Pinout](https://raw.githubusercontent.com/ai03-2725/Unified-Daughterboard/master/Design%20Resources/C3/Pinout-JST-4.jpg)
This pinout is identical on both the daughterboard side and mainboard side.