Capella CM3218 is a low‑power I²C ambient‑light sensor designed in CMOS, integrating a photodiode, amplifier, and analog circuits on a single chip. It operates over a supply voltage range of about 2.7 V to 5 V and offers detection sensitivity from ~0.00089 lux up to ~149 000 lux. The device supports threshold‑window interrupt triggering to reduce host monitoring load, and features efficient refresh control and excellent temperature compensation, consuming under 1 µA in shutdown mode,