Spark Logic

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.

R1 4.7 kΩ between +3.3 V and I²C data+3.3 VR1 4.7 kΩI²C data
R2 4.7 kΩ between +3.3 V and I²C clock+3.3 VR2 4.7 kΩI²C clock
C1 100 nF between +3.3 V and Ground+3.3 VC1 100 nFGround
C2 100 nF between Reset and interface reference and GroundReset and interface referenceC2 100 nFGround

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

4 · SDA

Bidirectional · Bidirectional

Open-drain I²C data. The bus needs a pull-up to its logic rail.

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.