BH1750FVI

Part: BH1750FVI — ROHM

Type: Digital Ambient Light Sensor IC (I²C, illuminance-to-digital converter)

Description: 16-bit digital ambient light sensor with I²C interface, 1–65535 lx range, 1 lx high-resolution mode, 2.4–3.6 V supply and 0.01 μA typical power-down current.

Operating Conditions:

• Supply voltage (VCC): 2.4–3.6 V (typ. 3.0 V)
• Operating temperature: -40 to 85 °C
• I²C reference voltage (DVI): 1.65 V to VCC
• I²C clock up to 400 kHz

Absolute Maximum Ratings:

• Max supply voltage: 4.5 V
• Operating temperature: -40 to 85 °C
• Storage temperature: -40 to 100 °C
• SDA sink current: 7 mA
• Power dissipation: 260 mW

Key Specs:

• Supply current: 120 μA typ., 190 μA max (Ev = 100 lx, white LED, VCC = 3.0 V, Ta = 25 °C)
• Power-down current: 0.01 μA typ., 1.0 μA max (no light)
• Peak wavelength: 560 nm typ.
• Measurement accuracy (sensor out / actual lx): 1.2 typ. (0.96–1.44) at Ev = 1000 lx
• Resolution: H-mode 1 lx, L-mode 4 lx (H-mode2 0.5 lx per instruction set)
• Measurement time: H-mode 120 ms typ. / 180 ms max; L-mode 16 ms typ. / 24 ms max
• Dark sensor output: 0–3 counts max in H-resolution mode at 0 lx
• SDA output low voltage: 0.4 V max at IOL = 3 mA
• Input high voltage SCL/SDA: 0.7×DVI min (DVI ≥ 1.8 V); 1.26 V min (1.65 V ≤ DVI < 1.8 V)

Features:

• I²C bus interface (F/S mode supported)
• Spectral response approximately that of the human eye
• Wide range, high resolution (1–65535 lx)
• Power-down function for low current
• 50 Hz / 60 Hz light noise rejection
• 1.8 V logic input interface
• No external parts needed
• Little light-source dependency (incandescent, fluorescent, halogen, white LED, sunlight)
• Two selectable I²C slave addresses via ADDR pin
• Adjustable measurement time register (MTreg 31–254) to compensate optical window; detects down to 0.11 lx and up to 100000 lx
• Small measurement variation (±20%)
• Very small infrared influence

Applications:

• Mobile phone
• LCD TV
• Notebook PC
• Portable game machine
• Digital camera / 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

※ 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.