hi,
i've planned the same project, but i'm also not very experienced in i2c.
what i know yet:
at first, the adress of oz890 is 0x60! (see page 56)
normally PEC is disabled, so you don't have to do the crc calculation(and transmission) (see page 41)
if you want to read data you must send the reg index (e.g. 0x00 chip id page 67) and after the i2c-restart you can read the answer byte (here 0x02)
this is my problem, i don't know how to do the restart (i only know wire.write and wire.read) perhaps with wire.begin/end.transmission?
any ideas?