ISL29030A

The ISL29030A is an integrated ambient and infrared light-to-digital converter with a built-in IR LED driver and I²C interface (SMBus compatible). This device uses two independent ADCs for concurrently measuring ambient light and proximity in parallel. The flexible interrupt scheme is designed for minimal microcontroller utilization. For ambient light sensor (ALS) data conversions, an ADC converts photodiode current (with a light sensitivity range of 2000 lux) in 100ms per sample. The ADC rejects 50Hz/60Hz flicker noise caused by artificial light sources. The IALS pin provides an analog output current proportional to the measured light (420μA FSR). For proximity sensor (Prox) data conversions, the built-in driver turns on an external infrared LED, and the proximity sensor ADC converts the reflected IR intensity to digital. This ADC rejects ambient IR noise (such as sunlight) and has a 540μs conversion time. The ISL29030A provides low-power operation of the ALS and proximity sensing, with a typical 138μA normal operation current (110μA for sensors and internal circuitry; ~28μA for external LED, with 220mA current pulses for a net 100μs, repeating every 800ms or under). The ISL29030A uses both a hardware pin and software bits to indicate an interrupt event has occurred. An ALS interrupt is defined as a measurement that is outside a set window. A proximity interrupt is defined as a measurement over a threshold limit. The user can configure the device so that ALS and proximity interrupts occur simultaneously, up to 16 times in a row, before the interrupt pin is activated. The ISL29030A is designed to operate at 2.25V to 3.63V over the -40 °C to +85 °C ambient temperature range. It is packaged in a clear, lead-free 8 lead ODFN package.