SKU: SENS-3219
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ROHM Semiconductor BH1749NUC-E2 Ambient Light Sensor IC - UFDFN-8-EP Package

₹91.00 (Inclusive of all taxes)
Out of Stock

The ROHM Semiconductor BH1749NUC-E2 is a high-precision ambient light sensor (ALS) IC in a compact UFDFN-8-EP package, designed for 2.4V to 3.6V operation. It features an I2C digital interface for seamless integration with microcontrollers like Arduino, Raspberry Pi, ESP32, and STM32, enabling accurate ambient light sensing for automatic display brightness control and energy-saving applications.

Features

  • High-accuracy ambient light sensor (ALS) with I2C digital output.
  • Wide operating voltage range: 2.4V to 3.6V DC.
  • Compact UFDFN-8-EP (8-pin) surface-mount package.
  • Integrated IR-cut filter for photopic response matching human eye sensitivity.
  • Ultra-low power consumption for battery-powered IoT and mobile devices.

Out of stock

Description

The BH1749NUC-E2 from ROHM Semiconductor Semiconductor is a digital ambient light sensor that converts light intensity into a digital signal via an integrated ADC and I2C interface. Its sensing principle utilizes photodiodes with a spectral sensitivity curve optimized to match the human eye’s photopic response, enhanced by an integrated infrared rejection filter. This ensures accurate lux measurement under various light sources, including sunlight and artificial lighting.

Engineered for stability and reliability, the sensor operates across a wide temperature range and is housed in a robust, lead-free UFDFN package suitable for automated PCB assembly. Its low-power design and programmable measurement modes make it ideal for integration into portable electronics, industrial HMIs, and smart home automation systems where precise ambient light monitoring is critical for user experience and power management.

Key Features

  • Digital I2C Interface: Enables direct connection to microcontrollers with simple two-wire communication and programmable settings.
  • Human Eye Response Matching: Integrated IR-cut filter provides a precise photopic response for accurate lux calculation.
  • Wide Dynamic Range & High Resolution: Capable of detecting light levels from dark to bright sunlight with high-resolution digital output.
  • Ultra-Low Current Consumption: Features power-down and programmable measurement modes to minimize energy use in portable applications.
  • Robust UFDFN-8-EP Package: Compact, surface-mount package with an exposed pad for enhanced thermal performance and mechanical stability.
  • RoHS Compliant: Manufactured with lead-free materials meeting environmental standards.

Applications

  • Automatic display brightness adjustment in smartphones, tablets, and laptops.
  • Backlight dimming control for industrial HMIs and automotive instrument clusters.
  • Ambient light monitoring in smart home IoT devices and lighting control systems.
  • Energy-saving light management in consumer electronics and portable gadgets.
  • Light intensity data logging in environmental monitoring and building automation.

Technical Specifications

Manufacturer Part NumberBH1749NUC-E2
Manufacturer / BrandROHM Semiconductor Semiconductor
Sensor TypeDigital Ambient Light Sensor (ALS)
InterfaceI2C (Two-wire Serial)
Supply Voltage Range2.4 V to 3.6 V DC
Package / CaseUFDFN-8-EP
Number of Pins8
Spectral ResponsePhotopic (with IR-cut filter)
Measurement RangeWide dynamic range (programmable)
ComplianceRoHS

Frequently Asked Questions

What is the operating voltage range for the BH1749NUC-E2 sensor?

The BH1749NUC-E2 operates from 2.4V to 3.6V DC. It is designed for direct compatibility with common 3.3V microcontroller logic levels, making it suitable for integration with systems like Arduino, ESP32, and Raspberry Pi without requiring a level shifter.

What communication protocol does this ambient light sensor use?

This sensor uses a standard I2C (Inter-Integrated Circuit) digital interface. It communicates via a two-wire serial bus (SCL, SDA), allowing for easy daisy-chaining and communication with a host microcontroller for reading digital lux values and configuring measurement parameters.

Does the BH1749NUC-E2 require any external components for basic operation?

For basic light sensing, the IC requires standard I2C pull-up resistors on the SDA and SCL lines, a stable power supply within 2.4V-3.6V, and decoupling capacitors near the VDD pin. The integrated ADC and signal conditioning eliminate the need for external amplifiers or complex analog circuitry.

How does the sensor's spectral response compare to the human eye?

The BH1749NUC-E2 incorporates an integrated infrared rejection filter, which tailors its spectral sensitivity to closely match the human eye's photopic response curve. This ensures that its lux readings are accurate under various light sources, including those with significant IR content.

Package Includes

  • 1 x ROHM Semiconductor BH1749NUC-E2 Ambient Light Sensor IC (UFDFN-8-EP package)

Additional Information

Weight 0.01 kg