FDC1004-Q1: diagnostic check?

Part Number: FDC1004-Q1

Hi all,

One of the FDC1004-Q1 chips I am using for prototyping liquid sensing is behaving "oddly".

Specifically, I can read/write to the FDC register (0x0C) but I can not read to any of the MEAS* registers {0x08, 0x09, 0x0A, 0x0B}.

A second chip I have works fine with the same code. I'm using arduino if it matters.

Is there a way to check the "health" of a chip? I'm curious to see if I've somehow fried it. I do have a logic analyser available.