Reusing the IBM capsense chip in Model F?

[tigpha]

Has anyone managed to salvage and reuse the capsense chip in IBM Model F keyboards? It's a chip housed in a square, silver colour can, with about 20 pins on a 5 by 5, 0.1 inch grid. I've seen these inside Bigfoot terminal keyboards and PC-XT keyboards. If I replace the controller chip, such as the 8405 in the PC-XT, with e.g. an arduino type thing, could it drive the IBM Mystery Chip?

[Muirium]

That silver chip is indeed the capsense bit. Xwhatsit wrote about it a few years ago. I don't think it's the full controller though. It might just be the analog comparator part. Topre splits the functions that way, as I understand.