What is the brand of this mystery chip?
You're in luck even with the bad photo: https://ams.com/.

I just typed the letters on the logo into google and searched for a company with the same logo/font.

EDIT: Actually, I think I lied. There's no way I could see that the third character in the logo was a sideways 'S' but "AMS" was the first thing that popped into my mind as soon I saw the "AM". I must have run into them before. I think we used one of their quadrature encoder ICs in a space elevator project in university.