High-Precision Ambient Light Sensor
Description
NOA1312
Product Preview
High-Precision Ambient Light Sensor with Three I2C
Slave Addresses, EEPROM
and Dark Current
Compensation
Description The NOA1312 high−precision ambient light sensor (ALS) is
designed for very high accuracy (better than ±5% tolerance) handheld applications.
The device integrates a 16−bit ADC, a 2−wire I2C digital interface with three pin−selectable I2C slave addresses, internal clock oscillator, EEPROM and a power down mode.
A photopic optical color filter together with built in dynamic dark current compensation and precision calibration capability plus 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 NOA1312 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.
Features
• Senses Ambient Light and Provides an Output Count Proportional to
the Ambient Light Intensity
• Human Eye Spectral Response using Photopic Optical Filter
• Dynamic Dark Current Compensation
• Very High Accuracy (better than ±5% tolerance)
• Ev Sensitivity of 5.
2 Counts/lux • Three I2C Slave Addresses (0x29, 0x39 and 0x49), Pin Selectable
• Less than 240 mA Active Power Consumption in Normal Operation
• Ultra−low Quiescent Power Dissipation, less than 100 nA in Power
Down Mode (below 50°C)
• Interrupt Signal Notifies Host of Significant Intensity Changes
• Internal EEPROM Stores Values to Minimize Programming Time
• Register Values Preserved during Power−down Mode
• 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.
096 lux to Full Sunlight
• Programmable Integration Times
• No External Components Required
• Built−in 16−bit ADC • I2C S...
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