This document describes the features and characteristics of the BH1721FVC digital ambient light sensor IC from ROHM. The sensor can obtain ambient light data through the I2C bus interface and is suitable for adjusting the LCD and keypad backlight power of mobile phones. It has a wide range and high resolution detection capability (1-65528 lx) and is compatible with various light sources. It is compact in size and does not require any external components.
The BH1721FVC is a digital ambient light sensor IC designed for I²C bus interface, offering a wide measurement range (1‑65528 Ix) and high resolution. It operates from 2.4 V to 3.6 V and includes a low‑current power‑down function, making it suitable for backlight control in mobile phones, LCD TVs, and other portable devices.
The document includes electrical characteristics, timing diagrams for VCC and DVI power‑up, instruction set architecture, measurement modes, and example application circuits. Ordering information and legal notices are also provided.
| Supply Voltage (Absolute Max) | 45 V |
|---|---|
| Operating Temperature Range | -40 °C to 85 °C |
| I²C Slave Address | 0100011b |
| Supply Voltage (Operating) | 2.4 V – 3.6 V |
| Measurement Resolution (H‑Resolution) | 1 Ix |
| Measurement Time (H‑Resolution) | 120 ms typical |
The slave address is 0100011b.
The typical measurement time for H‑Resolution mode is about 120 ms.
It operates from 2.4 V to 3.6 V.
The absolute maximum supply voltage rating is 45 V.