Description
The NOA1305 ambient light sensor (ALS) is designed for handheld applications and integrates a 16−bit ADC, a 2−wire I2C digital interface, internal clock oscillator and a power down mode. The built in dynamic dark current compensation and precision calibration capability coupled with excellent IR and 50/60 Hz flicker rejection enables highly accurate measurements from very low light levels to full sunlight. The device can support simple count equals lux readings in interrupt−driven or polling modes. The NOA1305 employs proprietary CMOS image sensing technology from ON Semiconductor to provide large signal to noise ratio (SNR) and wide dynamic range (DR) over the entire operating temperature range. The optical filter used with this chip provides a light response similar to that of the human eye.

FEATUREs
• Senses Ambient Light and Provides an Output Count Proportional to
   the Ambient Light Intensity
• Photopic Spectral Response
• Dynamic Dark Current Compensation
• IR Rejection Eliminates Need for Additional IR Photodiode
• Less than 120 A Active Power Consumption in Normal Operation
• Less than 2 μA Power Dissipation in Power Down Mode
• Interrupt Signal Notifies Host of Significant Intensity Changes
• Wide Operating Voltage Range (2.4 V to 3.6 V)
• Wide Operating Temperature Range (−40°C to 85°C)
• Linear Response Over the Full Operating Range
• Senses Intensity of Ambient Light from 0.165 Lux to Over 100K Lux
• 8 Selectable Integration Times Ranging from 6.25 ms to 800 ms
• No External Components Required
• Built−in 16−bit ADC
• I2C Serial Communication Port Supports Standard and Fast Modes
• Metal Mask Programmable I2C Slave Address Option Available
• These Devices are Pb−Free and are RoHS Compliant

APPLICATIONs
• Saves Display Power In Applications Such As:
   ♦ Cell Phones, PDAs, MP3 Players, GPS
   ♦ Cameras, Video Recorders
   ♦ Mobile Devices with Displays or Backlit Keypads