Journal Entry #0103

Project: 02004 (Firewire-PD)

2026-01-28, Anthony Remark, Marian Scientific, AMDG

A couple of days ago, I was tasked to create a PCB that essentially converts power from a USB-C to a firewire socket. A rough schematic was made and a custom footprint was created for the anticipated firewire female port. Yesterday, the Schematic was updated from a reference workflow and is as shown:

From the above link, configuration 6.1 was chosen (with the CH224K) on page 4. In preparation for the PCB layout, all components were prescribed footprints that were capable of being hand soldered and easily obtainable parts. But KiCAD doesn't have a footprint for the IEEE1394 (firewire) female port. So a suitable part was researched for this project and one was found on mouser here and Digikey as well, here . This is the 929 by Keystone Electronics. This datasheet schematic was used to make a custom footprint for the 929. Here's the custom footprint I made:

Next time I anticipate to make the PCB design and have it looked over as well.