ISL29023 Digital Light Sensor

Renesas' ISL29023 is an integrated digital light sensor with 16 bits of resolution and interrupts

Renesas' ISL29023 is an integrated ambient and infrared light to digital converter with an I²C Interface that is SMBus compatible. The 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 70 µA. 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. The ISL29023 supports a software and hardware interrupt that remains asserted until the host clears it through the I²C interface. The function of the ADC conversion continues without stopping after interrupt is asserted. Designed to operate on supplies from 2.25 V to 3.63 V with an I²C supply from 1.7 V to 3.63 V, the ISL29023 is specified for operation over the -40°C to +85°C ambient temperature range. The rich feature set of the ISL29023 makes it suitable for mobile devices, digital cameras, TV’s, smart phones, IoT, industrial and medical light sensing applications.