LX1972 Ambient Light Sensor – Human-Eye Response Light Detection IC

LX1972 Ambient Light Sensor IC

Product Description

The LX1972 Ambient Light Sensor IC is a silicon-based light sensor designed to closely match the spectral response of the human eye. Its response peaks around 520nm while maintaining very low infrared sensitivity, making it suitable for applications requiring accurate ambient light detection similar to human vision.

The device integrates a PIN photodiode array with high-gain current mirrors to provide a linear and repeatable output current proportional to the detected light level. The output can be easily converted into a voltage using a single external resistor.

Human-Eye-Like Spectral Response

The LX1972 is optimized to detect visible light in a way that closely resembles human vision. Its very low IR sensitivity, specified as less than ±5% above 900nm, reduces the influence of infrared light on measurements.

Simple Analog Interface

The sensor provides a photocurrent output that can be converted to a usable voltage using an external resistor. This makes the LX1972 simple to integrate into ambient-light detection and automatic brightness-control circuits.

Stable & Reliable Operation

The LX1972 includes temperature compensation for stable performance across a wide operating temperature range of -40°C to +85°C. It supports a usable light range from approximately 1 lux to over 5000 lux according to the supplied product information.

Key Features

• Human-eye-like spectral response
• Peak response around 520nm
• Very low infrared sensitivity
• Integrated PIN photodiode array
• High-gain photocurrent amplification
• Linear and repeatable output
• Output easily converted using an external resistor
• Temperature-compensated operation
• No external optical filter required
• Suitable for low-voltage applications

Technical Specifications

Feature	Specification
Product Type	Ambient Light Sensor IC
Sensor Type	PIN Photodiode Array
Peak Spectral Response	Approx. 520nm
IR Sensitivity	< ±5% above 900nm
Light Range	Approx. 1 to >5000 Lux
Operating Temperature	-40°C to +85°C
Dark Current	<200nA
Output	Photocurrent
Output Conversion	External Resistor
Temperature Compensation	Supported

Working Principle

The integrated PIN photodiode array detects ambient light and generates a photocurrent proportional to the light intensity. Internal high-gain current mirrors amplify this signal to a useful level.

An external resistor can then be used to convert the output current into a voltage suitable for monitoring or control circuitry.

Typical Application Scenarios

Display Brightness Control

Suitable for automatically adjusting the brightness of LCD, tablet, notebook, monitor, and television displays according to ambient lighting.

Ambient Light Compensation

Can be used in electronic devices that need to compensate display or system performance based on surrounding light conditions.

Portable Electronics

Suitable for portable displays, digital cameras, and other battery-powered devices requiring ambient light detection.

Applications

• Ambient light sensing
• LCD backlight control
• TV display brightness control
• Notebook brightness adjustment
• Tablet display control
• Desktop monitors
• Digital cameras
• Portable electronics
• Automatic brightness systems
• Energy-efficient display systems

Package Includes

• 1 × LX1972 Ambient Light Sensor IC

Important Note

The LX1972 provides a photocurrent output, so an appropriate external resistor and supporting circuit are required to convert the sensor signal into a voltage for measurement or control.

Product Disclaimer

Product information may vary between manufacturers and production batches. Product images are for illustrative purposes only and may differ slightly from the actual product in package type, markings, or appearance.