Part: BH1750FVI — ROHM Semiconductor

Type: Digital Ambient Light Sensor IC

Description: Digital 16-bit serial output ambient light sensor IC with I2C bus interface, capable of detecting a wide range of illuminance from 1 to 65535 lx (or 0.11 to 100000 lx with adjustment function) with spectral responsibility approximately human eye response.

Operating Conditions:

• Supply voltage: 2.4–3.6 V
• Operating temperature: -40 to 85 °C
• I2C Reference Voltage (VDVI): 1.65 V to VCC

Absolute Maximum Ratings:

• Max supply voltage: 4.5 V
• Max SDA Sink Current: 7 mA
• Max storage temperature: 100 °C

Key Specs:

• Supply Current (Ev = 100 lx): 120 μA (typ), 190 μA (max)
• Powerdown Current (No input Light): 0.01 μA (typ), 1.0 μA (max)
• Peak Wave Length: 560 nm (typ)
• H-Resolution Mode Resolution: 1 lx (typ)
• L-Resolution Mode Resolution: 4 lx (typ)
• H-Resolution Mode Measurement Time: 120 ms (typ), 180 ms (max)
• L-Resolution Mode Measurement Time: 16 ms (typ), 24 ms (max)
• I2C SCL Clock Frequency: 400 kHz (max)
• I2C SDA Output 'L' Voltage (IOL = 3 mA): 0.4 V (max)

Features:

• I2C bus Interface (f/s Mode Support)
• Spectral responsibility is approximately human eye response
• Illuminance to Digital Converter
• Wide range and High resolution (1 - 65535 lx)
• Low Current by power down function
• 50Hz / 60Hz Light noise reject-function
• 1.8V Logic input interface
• No need any external parts
• It is possible to select 2 type of I2C slave-address
• Adjustable measurement result for influence of optical window (min. 0.11 lx, max. 100000 lx)

Applications:

• Mobile phone
• LCD TV
• NOTE PC
• Portable game machine
• Digital camera
• Digital video camera
• PDA
• LCD display

Package:

• 1. I 2 C bus Interface ( f / s Mode Support )
• 1. Spectral responsibility is approximately human eye response
• 1. Illuminance to Digital Converter
• 1. Wide range and High resolution. ( 1 - 65535 lx )
• 1. Low Current by power down function
• 1. 50Hz / 60Hz Light noise reject-function
• 1. 1.8V Logic input interface
• 1. No need any external parts
• 1. Light source dependency is little. ( ex. Incandescent Lamp. Fluorescent Lamp. Halogen Lamp. White LED. Sun Light )
• 1. It is possible to select 2 type of I 2 C slave-address.
• 1. Adjustable measurement result for influence of optical window ( It is possible to detect min. 0.11 lx, max. 100000 lx by using this function. )
• 1. Small measurement variation (+/- 20%)
• 1. The influence of infrared is very small.

Mobile phone, LCD TV, NOTE PC, Portable game machine, Digital camera, Digital video camera, PDA, LCD display

BH1750FVI Pinout

Package: WSOF6I (6-pin small outline)

Notes

• DVI is critical for reset: DVI must be pulled low (≤0.4 V) for at least 1 μs after VCC is supplied to properly initialize the IC. DVI also serves as the I²C reference voltage (1.65–3.6 V during operation).
• ADDR terminal: Designed as a 3-state buffer for internal testing; requires careful power supply sequencing. If not directly connected to VCC or GND, use ~100 kΩ pull-up/pull-down resistors.
• SDA/SCL: Open-drain outputs; external pull-up resistors required for I²C bus operation (standard I²C design).
• Exposed pad on package back: Non-functional; do not solder or connect electrically.
• Photo detector: Handle with care to avoid dust or scratches that may degrade optical characteristics.

※ 1 White LED is used as optical source.

※ 2 Measurement Accuracy typical value is possible to change '1' by "Measurement result adjustment function".

※ 3 Use H-resolution mode or H-resolution mode2 if dark data ( less than 10 lx ) is need.

Perform thermal design in which there are adequate margins by taking into account the power dissipation ( Pd ) in actual states of use.

The DVI terminal is an asynchronous reset terminal. Please note that there is a possibility that IC doesn't operate normally if the reset section is not installed after the start-up of VCC.

(Please refer to the paragraph of "Timing chart for VCC and DVI power supply sequence" )

The description concerning SDA and the terminal SCL is omitted in this application circuit example. Please design the application the standard of the I2C bus as it finishes being satisfactory. Moreover, the description concerning the terminal ADDR is omitted. Please refer to the paragraph of "Timing chart for VCC and DVI power supply sequence" about the terminal ADDR design.