SKU: SENS-3217
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ROHM Semiconductor BH1751FVI-TR WSOF-6 Ambient Light Sensor Module

₹57.00 (Inclusive of all taxes)
Out of Stock

The ROHM Semiconductor BH1751FVI-TR is a high-precision digital ambient light sensor (ALS) module in a compact WSOF-6 package. It provides direct lux output via I2C interface, making it ideal for automatic brightness control in displays, IoT devices, and energy-saving systems compatible with 3.3V/5V logic.

Features

  • High-resolution digital ambient light sensor with I2C interface
  • Wide detection range from 0 to 65535 lux
  • Integrated IR-cut filter for human-eye spectral response
  • Low power consumption for battery-powered applications
  • Compact WSOF-6 surface-mount package

Out of stock

Description

The BH1751FVI-TR from ROHM Semiconductor is a digital 16-bit serial output ambient light sensor IC. It converts light intensity to a digital value directly, eliminating the need for an external ADC. The sensor features a built-in photodiode with an integrated amplifier and ADC, providing stable and accurate lux measurements.

Its spectral sensitivity is optimized to match the human eye’s photopic response, thanks to an integrated infrared cut filter. The module communicates via a standard I2C bus, supporting both 3.3V and 5V logic levels, and offers selectable resolution modes for different application needs, from high-speed to high-precision measurements.

Key Features

  • Digital Lux Output: Provides direct 16-bit digital lux values via I2C, simplifying system integration.
  • Human Eye Response: Integrated IR-cut filter ensures spectral sensitivity closely matches the CIE standard photopic curve.
  • Wide Dynamic Range: Capable of measuring light intensity from 0 to over 65,000 lux.
  • Selectable Resolution Modes: Offers four different measurement modes (H-Resolution, H-Resolution2, L-Resolution, One-Time) for flexibility in speed vs. accuracy.
  • Low Power Operation: Designed for energy efficiency in portable and battery-operated devices.
  • Robust Temperature Performance: Stable operation across the industrial temperature range from -40°C to +85°C.

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 sensor nodes
  • Backlight dimming in automotive dashboards and infotainment systems
  • Photography equipment for automatic exposure and flash control

Technical Specifications

Manufacturer Part NumberBH1751FVI-TR
BrandROHM Semiconductor Semiconductor
Sensor TypeDigital Ambient Light Sensor (ALS)
InterfaceI2C (F/S Mode up to 400kHz)
Supply Voltage (Vdd)2.4V to 3.6V
Logic Voltage (VDDI)1.8V to 3.6V
Measurement Range0 to 65535 lux
Resolution0.5 lx to 4 lx (depending on mode)
Spectral SensitivityClose to human eye response (with IR-cut)
Operating Temperature-40°C to +85°C
Package / CaseWSOF-6
Number of Pins6

Frequently Asked Questions

What is the supply voltage range for the BH1751FVI-TR sensor?

The BH1751FVI-TR requires a supply voltage (Vdd) between 2.4V and 3.6V for the analog core. The digital interface logic voltage (VDDI) can be independently supplied from 1.8V to 3.6V, allowing flexible integration with 3.3V or 5V microcontroller systems using appropriate level shifting if needed.

How do I communicate with this sensor and read lux values?

Communication is via the standard I2C bus. The sensor has a 7-bit slave address (0x23 or 0x5C, configurable by pin). You send a command to select a measurement mode (e.g., continuous high-resolution), then read two bytes (high and low) to obtain the 16-bit raw lux value, which is converted to lux using a specified formula.

Does the sensor require calibration or external components?

No, the BH1751FVI-TR is a fully calibrated digital sensor. It includes the photodiode, amplifier, ADC, and logic on-chip, providing a direct digital output. Typically, only two pull-up resistors for the I2C lines (SDA, SCL) and decoupling capacitors near the power pins are required for stable operation.

What is the purpose of the different measurement modes?

The four modes (H-Resolution, H-Resolution2, L-Resolution, One-Time) offer trade-offs between measurement accuracy, resolution, and power consumption. H-Resolution modes offer the highest accuracy (1 lx resolution). L-Resolution is faster. One-Time mode powers the sensor down after a single measurement, minimizing current draw for battery-powered applications.

Package Includes

  • 1 x ROHM Semiconductor BH1751FVI-TR Ambient Light Sensor IC (WSOF-6 package)

Additional Information

Weight 0.01 kg
Dimensions 10 × 8 × 5 cm