BH1750 ambient light sensor connection guide

BH1750 ambient light sensor WSOF-6I wiring guide with power, signal assignments, and bench checks.

WSOF-6I

7 contacts Current package

ROHM ·

Connect an I²C host

Required

Use the manufacturer’s host-controlled DVI circuit. Choose a GPIO that can drive the bypass capacitance and maintain DVI near 3.3 V after reset. Tie ADDR to ground and leave the underside pad electrically isolated.

+3.3 V
- VCC (1)
- Host 3.3 V
- C1.1
- R1.1
- R2.1
Ground
- GND (3)
- ADDR (2)
- Host ground
- C1.2
- C2.2
I²C data
- SDA (4)
- Host SDA
- R1.2
I²C clock
- SCL (6)
- Host SCL
- R2.2
Reset and interface reference
- DVI (5)
- Host push-pull reset control
- C2.1

Bench checks

Observe VCC and DVI during startup. Confirm DVI remains low for at least 1 µs after VCC is in range, then rises to the bus reference. Keep the bus idle during reset.
Find address 0x23. Send power-on (0x01) and one-time high-resolution mode (0x20), with a STOP after each command. Wait 180 ms and read two bytes.
At the default measurement-time setting, divide the unsigned result by 1.2 for lux. Cover and uncover the sensor and compare the readings.

ROHM BH1750FVI Technical Note, Rev. D (November 2011), pp. 2, 6–10, 13 and 16–17. Manufacturer PDF hosted by Mouser.

WSOF-6I wiring map

Highlighted contacts are used in the required step or selected circuit. Select a contact to inspect it.

Top view. Start at the package pin-1 index and follow the numbered leads.
EP is the exposed center pad on the underside.

Selected pin details

5 · DVI

Reference input · Reset / preset

I²C reference and active-low asynchronous reset. Hold at or below 0.4 V for at least 1 µs after VCC is supplied.

ROHM BH1750FVI Technical Note, Rev. D (November 2011), pp. 2, 6–10, 13 and 16–17. Manufacturer PDF hosted by Mouser.

Electrical limits · Pin in the reference

Models and documents

The map applies to the bare BH1750FVI. Breakout modules may supply DVI from separate circuitry.

BH1750FVI-TR: WSOF-6I, tape and reel.

BH1750 manufacturer documentation· ROHM BH1750FVI Technical Note, Rev. D (November 2011), pp. 2, 6–10, 13 and 16–17. Manufacturer PDF hosted by Mouser.