Nothing more than the user documentation that came with it (the Link actually has a PDF version that matches what I had).
The FCC link for the CA9000 has not much of use.
Not anything of relevance over on ST (or Vera, Homeseer, or Amazon) about it that I could find, no results on github. Only reference for HomeAssistant is the identifier for it (Product id="9000" name="CA9000 PIR Occupancy Sensor" type="4341").
It was probably less than a month ago that I finally tossed them and deleted my code attempts. Sorry.