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geekhack Community => Keyboards => Topic started by: jakllsch on Tue, 13 March 2018, 19:13:22

Title: Tex Yoda II 'U4'
Post by: jakllsch on Tue, 13 March 2018, 19:13:22

I would like to know what any markings on the 10-pin U4 chip on the Yoda 2 PCB are.  It's located on the bottom of the PCB between the K and L switches.  I'm trying to figure out what involvement it may have with the TrackPoint interface.  I'd answer this myself, but my Yoda II hasn't shipped yet.  :rolleyes:

Title: Re: Tex Yoda II 'U4'
Post by: jakllsch on Tue, 20 March 2018, 14:53:47

I found https://imgur.com/r/mechanicalkeyboards/Rxvyp which has enough detail in https://imgur.com/XhFSie0 for me to read "SONIX" off of U4.  Comparing pin-usage in the photo with pinouts of MSOP-10 microcontrollers available from Sonix leads me to believe it's probably a SN8PC2210A.  It is then reasonable to conclude that some sort of non-transparent protocol translation is happening between the trackpoint module's microcontroller and the main microcontroller that runs the keyboard.

Title: Re: Tex Yoda II 'U4'
Post by: jakllsch on Sun, 25 March 2018, 19:17:18

Quote from: jakllsch on Tue, 20 March 2018, 14:53:47

I found https://imgur.com/r/mechanicalkeyboards/Rxvyp which has enough detail in https://imgur.com/XhFSie0 for me to read "SONIX" off of U4.  Comparing pin-usage in the photo with pinouts of MSOP-10 microcontrollers available from Sonix leads me to believe it's probably a SN8PC2210A.  It is then reasonable to conclude that some sort of non-transparent protocol translation is happening between the trackpoint module's microcontroller and the main microcontroller that runs the keyboard.

For archival posterity now that I have a Yoda II:

It's marked:
SONIX
8F26E611LA