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Home » NEWEST Products » New by Manufacturer » Intersil Corporation » ISL29147 Ambient Light Sensor - Intersil
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Intersil ISL29147 Ambient Light Sensor

Intersil ISL29147 Ambient Light Sensor

Intersil ISL29147 is a low power Ambient Light Sensor and Proximity Sensor. The ALS function measures the amount of light (in the visible spectrum) incident on the ISL29147. 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. ISL29147 has a built-in IR-LED for the proximity function. 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 ISL29147 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 the ISL29147 is digitized by an 8-bit ADC. The proximity sensor also has a passive optical filter designed to pass IR and reject visible wavelengths.

Features
  • Internal IR-LED and sensor for a complete solution
  • 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
  • Programmable IR LED drive current to 250mA
  • Operates from 2.25V to 3.63V VDD
  • Power-down IDD, typical 0.2µADC
  • Tiny 2.40x4x1.2 (mm) optical co-package
Applications
  • Display dimming and adjustment
  • Mobile devices: smart phones, PDA, GPS
  • Computing: monitors, laptops, notebooks
  • Picture frames, tablet-PCs, LCD-TV
  • Object detection
    • Touchscreen disabling
    • Smart power-saving

Typical Application Circuit
Typical Application Circuit
  • Intersil Corporation