hard-wookey-motherboard: A Shell repository from WooKey Project

# WooKey Mainboard PCB

Introduction

Authors: The Wookey project Team wookey@ssi.gouv.fr

The Wookey from ANSSI is an open source hardware design, implementing an Encrypted Flash Drives.

This repository is aimed towards developers.

Revision information

This directory contains the hardware design for the Wookey board, first public version (Wookey V2).

### PCB editing tools

All PCB files (schematic and PCB layout) have been designed using the KiCad EDA. This Cross Platform and Open Source Electronics Design Automation Suite can be downloaded on http://kicad-pcb.org/.

Production files generation 101

Configure the project

KiCad binaries location may change regarding your operating system. This is why you have to set your environment. This is done by sourcing the setenv.sh script. This script exports all paths that are required in order to automaticaly generate the production files.

Most of the time, the paths proposed in this script are not the one you use in your specific installation. The setenv.sh script support easy variables overloading by including a setenv.local.sh script file if this file exists in the same directory. If you need to overload some of the variables of the setenv.sh script, just add them to your own setenv.local.sh file. Here is an example to define KiCad environement path on Apple Mac OS.

  $ echo "export PYTHON_BIN_PATH = /Applications/KiCad/kicad.app/Contents/Frameworks/Python.framework/Versions/2.7/bin/python" > setenv.local.sh
  $ source setenv.sh
  Loading local SDK settings...
  =========================================================
  === Kicad environment configuration
  =========================================================
  PYTHON_BIN_PATH   = /Applications/KiCad/kicad.app/Contents/Frameworks/Python.framework/Versions/2.7/bin/python
  PYTHON_PATH     = /Applications/Kicad/kicad.app/Contents/Frameworks/python/site-packages
  BOM_GEN_PATH = /Applications/Kicad/kicad.app/Contents/SharedSupport/plugins/bom2grouped_csv.xsl
  TOOLS_PATH = ../../../tools
  =========================================================

The production files can be generated using the following command.

$ make

This will generate the production files in a new sub directory. The directory name may differ according the project your are working with.

PCB Pinout

PCB Layers

PCB TOP layer

PCB BOTTOM layer

Layers

Order and type of copper layers: TOP: signal, front components GND: ground plane PWR: ground and power plane BOT: signal, back components

Stackup

4 layers, 1.6mm thickness Outer layers 1 oz base copper foil Inner layers 0.5 oz base copper foil

Electroless Nickel Immersion Gold (ENIG) surface finish

solder resist 0.0254mm copper 0.0356mm L1 (TOP) FR408 prepreg 0.1702mm copper 0.0178mm L2 (GND) FR408 1.1938mm copper 0.0178mm L3 (PWR) FR408 prepreg 0.1702mm copper 0.0356mm L4 (BOT) solder resist 0.0254mm

The substrate for both the core and prepreg is FR408, with a dielectric constant of 3.66 at 1GHz. The prepreg is comprised of 2 layers of Isola 2113.

Regulatory compliance & handling

The Wookey board is intended for use as a development platform for hardware or software. The board is an open system design, which does not include a shielded enclosure. This may cause interference to other electrical or electronic devices in close proximity. In a domestic environment, this product may cause radio interference in which case the user may be required to take adequate measures. In addition, this board should not be used near any medical equipment or RF devices.

The board is sensitive to ESD. Hold the board only by its edges. After removing the board from its box, place it on a grounded, static-free surface.

The board can become hot, like any fan-less design, during continuous high CPU loads, mind its temperature while handling it.

License

Wookey | https://wookey-project.github.io/