Minimal open source external authentificator hardware keychain using STM32H533, designed to work with LionKey: An open-source FIDO2 USB Security Key.
Key features:
- minimalistic PCB design (64.5 x 17.5 mm)
- implements STM32H533CEU6
- features both USB A and USB C
- implements power and data lines switching between the two ports
- SWD via TC2030 connector
The design features a differential pair for the USB D+/- lines. Adjust the thickness and clearance
to the material of your manufacturer e.g. for JLC PCB specify the material as JLC04161H-3313
The design features an PCB edge USB A connector. Standard requires PCB thickness of 2 mm for proper connection in the connector. Either redo the PCB, or adjust the thickness otherwise (will be addressed in forthcoming case).
For easier assembly, a PCB and solder paste stencil housing 3D models are available. Suggested stencil size is 75 x 40 mm.
Here presented hardware is available as Open source hardware under the CERN-OHL-S license.
- first assembly and testing
- 3D printed case design (WIP)
- update an inner layer to power plane
- check necessity of components (implemented according to .ioc)
- update power switching mechanism