MAX44009 I2C Ambient Light Sensor Module (GY-49)

The GY-49 is an ultra-low-power ambient light sensor module based on the Maxim MAX44009 IC with an I2C digital interface. It measures light levels across an ultra-wide 22-bit dynamic range from 0.045 to 188,000 lux while mimicking the human eye's spectral response. This module is an excellent choice for makers, students, and developers building battery-powered IoT devices and smart lighting projects.

High dynamic range sensing

Featuring an integrated photodiode with IR and UV blocking capability, the sensor accurately mimics human visual perception. Its adaptive gain block automatically adjusts across a 22-bit range to measure illumination from 0.045 lux up to 188,000 lux, making it effective even in dark-glass applications.

Ultra-low power consumption

Designed for energy-conscious and portable designs, the IC operates from a 1.7V to 3.6V supply range. It consumes just 0.65µA in full operation and stays below 1µA operating current, extending battery life in field and wearable deployments.

Pinout and communication

The module communicates over standard I2C using VIN, GND, SCL, and SDA pins. It also provides an active-low interrupt (INT) pin with an onboard 10k pull-up resistor and an address select (A0) pin for configuring the I2C bus address.

Typical applications

This sensor is well suited for digital lighting management, smartphones, tablet PCs, notebook computers, TVs, displays, portable electronics, and security systems.

Downloads

• Datasheet