Intersil's ISL29035 is an integrated ambient and infrared light-to-digital converter with I²C (SMBus compatible) interface. Its advanced self-calibrated photodiode array emulates human eye response with excellent IR rejection. The on-chip ADC is capable of rejecting 50 Hz and 60 Hz flicker caused by artificial light sources. The Lux range-select feature allows users to program the Lux range for optimized counts/Lux.

For ambient light sensing, an internal 16-bit ADC has been designed based upon the charge-balancing technique. The ADC conversion time is nominally 90 ms and is user adjustable from 11 μs to 90 ms, depending on oscillator frequency and ADC resolution. In normal operation, typical current consumption is 57 μA. In order to further minimize power consumption, two power-down modes have been provided. If polling is chosen over continuous measurement of light, the auto-power-down function shuts down the whole chip after each ADC conversion for the measurement. The other power-down mode is controlled by software via the I²C interface. The power consumption can be reduced to less than 0.3 μA when powered down.