I have following trackpoint module of recent thinkpad x390. There are some info about older modules, most useful(combined) one is: https://deskthority.net/wiki/TrackPoint_Hardware
However, i found no info about this trackpoint module (which seems most of newer thinkpads use).
- IC has label "33306B 3900 1851 BG18CK2" (no datasheet on internet)
- On the backside: pcb has label "PSG8E8-Rev.2 AD19021218" (no results on google)
- I'm only guessing 2nd pin of 8pin FPC connector is the GND. I have no idea what are the others.