The ISL29038 is a low power ambient light sensor (ALS) and proximity (PROX) sensor. It has a built-in IR-LED driver for proximity function. The ALS function measures the amount of light (in the visible spectrum) incident on the ISL29038. The ALS function has a programmable ambient IR-rejection, which allows fine tuning of light source variations and is ideal for light sensor applications under dark protective glass. The ALS provides a 12-bit measurement. A passive optical filter removes unwanted wavelengths (IR or Ultraviolet) to ensure accurate ALS measurement. The proximity function includes a new offset adjustment to compensate for the IR light reflected off the inside of the protective glass cover and back to the ISL29038 sensor. This offset adjustment allows the sensor to compensate for these internal reflections and preserve the dynamic range of the proximity measurement. The built-in current-driver pulses an external infrared LED at a programmed current for 90µs. The infrared light that is reflected and received by ISL29038 is digitized by an 8-bit ADC. The proximity sensor also has a passive optical filter designed to pass IR and reject visible wavelengths. The ISL29038 provides a hardware pin to indicate an interrupt event. The interrupt pin saves power as the host microcontroller can ‘wake-up’ on an interrupt event and does not need to poll the device for an interrupt event. The interrupt generator is user configurable and provides several options for ALS and PROX trigger configurations. The ISL29038 supports an SMBus compatible I2C interface for configuration and control.

Features

  • Ideal for applications under dark or tinted glass
  • Enhanced ambient sunlight rejection to 40k lux
  • Programmable proximity sleep time between proximity measurements optimizes power consumption
  • Hardware interrupt - no polling required
  • Programmable IR compensation to fine tune ALS performance for various glass compositions
  • Up to 4000 lux, four selectable ALS ranges
  • Programmable IR LED drive current to 250mA
  • Operates from 2.25V to 3.63V VDD
  • Power-down IDD, typical 0.2µADC
  • Tiny 2.1mm x 2.0mm x 0.7mm ODFN package

Applications

  • Display dimming and adjustment
  • Mobile devices: Smartphones, PDAs, GPS
  • Computing: Monitors, laptops, notebooks
  • Picture frames, tablet-PCs, LCD-TVs
  • Object detection
  • Touchscreen disabling
  • Smart power-saving

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active HODFN Reel 3000
Availability

Documentation

Title language Type Format File Size Date
Datasheets & Errata
ISL29038 Datasheet Datasheet PDF 819 KB
Application Notes & White Papers
AN1682: What are the Advantages of Packaging a Proximity Sensor with an Ambient Light Sensor? Application Note PDF 276 KB
AN1737: Eye Safety for Proximity Sensing Using Infrared Light-Emitting Diodes Application Note PDF 712 KB
PCNs & PDNs
PCN21021 - Introduce alternate assembly facility of the listed Renesas ODFN packaged products Product Change Notice PDF 138 KB
PCN17003A - Alternate assembly facility of the listed Intersil ODFN packaged products Product Change Notice PDF 113 KB
PCN15010 - Additional assembly facility of the listed Intersil ODFN packaged products Product Change Notice PDF 76 KB

Boards & Kits

Part Number Title Type Company
ISL29038IROZ-EVALZ Ambient Light and Proximity Sensor Evaluation Board Evaluation Renesas