What is is this: (ic) NQ X2 P_13 0531

I'm building an encoder w/ an AMS chip and I found a similar application where they're using the chip below:
Looks like (ic) NQ X2 P_13 0531

I've searched for that part number in various ways on parts.io and other places, but it turns up nothing.

http://www.rls.si/rmb20-rotary-magnetic-module



Thanks,
Mark