The OPT4001 is a light-to-digital sensor (single chip lux meter) that measures the intensity of visible light. The spectral response of the sensor tightly matches the photopic response of the human eye. A specially engineered filter on the device rejects near-infrared component from the common light sources to measure accurate light intensity. Output of OPT4001 is semi-logarithmic with 9 binary logarithmic full-scale light ranges along with highly linear response within each range, bringing capability to measure from 312.5 µlux to 83 klux for PicoStar™ variant and 437.5 µlux to 117 klux for the SOT-5X3 variant. This capability allows light sensor to have 28-bit effective dynamic range. With built-in automatic full-scale range selection, logic users do not have to select appropriate gain settings based on light levels.

The engineered optical filter on OPT4001 provides strong infrared rejection, which aids in maintaining high accuracy, despite placing the sensor under dark glass, which is common requirement from industrial design of end products due to aesthetics.

The OPT4001 is designed for systems that require light level detection to enhance user experience and typically replaces low accuracy photo diodes, photo-resistors and other ambient light sensors with underwhelming human eye matching and near infra-red rejection.Read more