ROHM BH1721FVC Data Sheet/Manual
Summary
This technical IC is a high-resolution ambient light sensor designed to accurately measure illuminance across a wide range (1–65528 lux). The BH1721FVC features a robust I²C bus interface, making it exceptionally useful for devices needing intelligent power management, such as adjusting LCD or keypad backlights in mobile phones and other display electronics. This manual provides comprehensive details on its electrical characteristics, measurement modes (High/Low Resolution), and optimal integration guidelines for system developers building advanced electronic equipment.
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Ambient Light Sensor IC Series
Digital 16bit Serial Output Type Ambient Light Sensor IC BH1721FVC
No.11046EBT10
●Descriptions BH1721FVC is an digital Ambient Light Sensor IC for I2C bus interface. This IC is the most suitable to obtain the ambient light data for adjusting LCD and Keypad backlight power of Mobile phone. It is possible to detect wide range at High resolution. ( 1 - 65528 lx ).
●Features 1) I2C bus Interface ( f / s Mode Support, Slave Address : "0100011" ) 2) Spectral responsibility is approximately human eye response 3) Illuminance to Digital Converter 4) Wide range and High resolution. (1 – 65528 lx ) 5) Low Current by power down function 6) 50Hz / 60Hz Light noise reject-function 7) 1.8V Logic input interface 8) No need any external parts 9) Light source dependency is little. (ex. Incandescent Lamp. Fluorescent Lamp. Halogen Lamp. White LED. Sun Light) 10) Small measurement variation (+/- 15%) 11) Compact surface mount package 1.6 x 1.6 x 0.55 mm
●Applications Mobile phone, LCD TV, NOTE PC, Portable game machine, Digital camera, Digital video camera, PDA, LCD display
●Absolute Maximum Ratings
Parameter Symbol Ratings Units
Supply Voltage Vmax 4.5 V
Operating Temperature Topr -40～85 ℃
Storage Temperature Tstg -40～100 ℃
SDA Sink Current Imax 7 m A
Power Dissipation Pd 165※ m W ※70mm × 70mm × 1.6mm glass epoxy board. Derating in done at 2.2m W/℃ for operating above Ta=25℃.
●Operating Conditions
Ratings
Parameter Symbol Units
Min. Typ. Max.
VCC Voltage Vcc 2.4 3.0 3.6 V
I2C Reference Voltage VDVI 1.65 - VCC V
www.rohm.com 2011.11 - Rev.B
© 2011 ROHM Co., Ltd. All rights reserved.
Page Summary Contents For ROHM BH1721FVC Data Sheet/Manual
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 16 |
| File Size | 302.95 KB |
| Published | May 27, 2026 |
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Frequently Asked Questions
What interface does the sensor use for data transmission?
The BH1721FVC uses an I²C bus interface and has a defined Slave Address of "0100011".
Which mode should be used to measure very low ambient light levels?
Use H-Resolution Mode if the required measurement data is less than 20 lx.
What are the typical performance advantages according to the manual?
It offers wide range (1 – 65528 lx), high resolution, and includes a 50Hz/60Hz light noise reject-function.
Can I use this sensor in critically reliable applications like aerospace or medical equipment?
No. The product is not designed for equipment requiring extremely high levels of reliability, such as life support machinery.