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C series (C4 and newer)

Current latest version: C5.0 (Released 2023-10-22)

Overview

The C series daughterboard is the current most recent revision to the classic square form-factor daughterboard, with its roots in the C1 which was designed to be compatible with Wilba's keyboards.
The daughterboard features the following:

  • ESD protection, overcurrent protection, overvoltage protection, shielding noise decoupling, and single-path grounding to chassis functionality
  • Two variants: The new Molex Pico-EZmate and the classic JST-SH
  • 1:1 connector pinout to retain compatibility with existing PCBs
  • Same form factor as C1 and C2, allowing for daughterboard upgrades

Specification

  • Overall size: 18 x 16.5 mm
  • Screw holes: 14 x 12.5 mm apart.
  • Corner radius: 2 mm
  • Hardware: M2 screws
  • Connector: Molex Pico-EZmate (781710004)
  • PCB layers: 4 (7628 stackup)

Resources

GitHub: EZM (Pico-EZmate Variant), JSH (JST-SH Variant)
3D model: EZM (Pico-EZmate Variant), JSH (JST-SH Variant)
Example implementation
Production data

Images and Diagrams

Photo
Render front
Render rear
C

Changelog

  • 2023-10-22: C5.0 Release
    • Improved ESD handling
    • Added two connector variants
  • 2023-03-30: C4.1 Release
    • Updated footprint to S1 series reinforced footprint
    • Improve USB routing
  • 2023-01-18: C4.0 Release
    • Initial release