SKU: SENS-3220
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ROHM Semiconductor BH1721FVC-TR WSOF-5 Ambient Light Sensor

₹68.00 (Inclusive of all taxes)
Out of Stock

The ROHM Semiconductor BH1721FVC-TR is a digital ambient light sensor (ALS) in a compact WSOF-5 package, designed for precise light intensity measurement from 0 to 65,535 lux. Operating on a 2.4V to 3.6V supply, it features an I2C digital interface for seamless integration with microcontrollers like Arduino, Raspberry Pi, and ESP32 for automatic display brightness control and energy-saving applications.

Features

  • High-resolution digital ambient light sensor with I2C interface
  • Wide detection range from 0 to 65,535 lux
  • Low power consumption for battery-powered devices
  • Compact WSOF-5 surface-mount package
  • Integrated IR-cut filter for human-eye spectral response

Out of stock

Description

The BH1721FVC-TR is a digital-output ambient light sensor from ROHM Semiconductor Semiconductor that converts light intensity into a 16-bit digital value. It employs a photodiode with a built-in infrared rejection filter, ensuring its spectral sensitivity closely matches the human eye’s photopic response curve. This design minimizes errors caused by infrared light sources, providing accurate illuminance readings for true ambient light conditions.

The sensor communicates via a standard I2C bus, simplifying wiring and firmware development. Its automatic power-down mode and selectable measurement modes allow for optimized power management, making it ideal for portable electronics, IoT devices, and industrial control panels where adaptive backlight adjustment and energy efficiency are critical.

Key Features

  • Digital 16-bit resolution output via I2C interface (slave address: 0x23)
  • Wide dynamic range from 0 lux to over 65,535 lux with automatic range switching
  • Excellent spectral response matching the CIE standard human eye sensitivity
  • Integrated IR-cut filter for accurate visible light measurement
  • Ultra-low operating current for extended battery life in portable devices
  • Robust WSOF-5 package designed for reliable surface-mount assembly
  • Selectable measurement resolution and integration time for application flexibility
  • High-accuracy performance across a wide temperature range

Applications

  • Automatic display brightness adjustment in smartphones, tablets, and laptops
  • Energy-saving lighting control in smart home and building automation systems
  • Ambient light monitoring for IoT environmental sensors and weather stations
  • Backlight dimming in automotive dashboards and instrument clusters
  • Light intensity logging in agricultural monitoring and photography equipment

Technical Specifications

ManufacturerROHM Semiconductor Semiconductor
Manufacturer Part NumberBH1721FVC-TR
Package / CaseWSOF-5
Number of Pins5
Supply Voltage2.4V to 3.6V DC
InterfaceI2C Digital
Measurement Range0 to 65,535 lux
Spectral ResponseClose to human eye (photopic)
Output Resolution16-bit digital
Operating Temperature-40°C to +85°C (typical)

Frequently Asked Questions

What is the operating voltage range for the BH1721FVC-TR sensor?

The BH1721FVC-TR operates from a 2.4V to 3.6V DC supply. It is compatible with standard 3.3V logic microcontrollers like ESP32, Raspberry Pi, and many Arduino boards. Ensure your power supply is within this range for reliable operation and accurate readings.

How do I communicate with this sensor and what is the I2C address?

The sensor uses a standard I2C (2-wire) communication protocol. The default 7-bit I2C slave address is 0x23 (CubePilot). You will need to connect the SDA and SCL pins to your microcontroller, along with VCC and GND. Many libraries are available for platforms like Arduino to simplify data reading.

Does this sensor require any external components or calibration?

The BH1721FVC-TR is a fully integrated digital sensor and typically does not require external components or user calibration. For optimal performance, place a clear aperture or window in front of the sensor. Ensure the sensing element is not obstructed and is exposed directly to the ambient light you wish to measure.

What is the spectral response, and does it filter infrared light?

Yes, this sensor features an integrated infrared-cut filter. Its spectral sensitivity is designed to closely match the CIE standard photopic luminosity function, which approximates human eye response. This filtering ensures measurements represent visible light intensity, minimizing error from IR sources like incandescent bulbs or sunlight.

Package Includes

  • 1 x ROHM Semiconductor BH1721FVC-TR Ambient Light Sensor (WSOF-5 package)

Additional Information

Weight 0.01 kg