BH1750FVI

Technical Note

4/17

www.rohm.com

2009.04- Rev.B

© 2009 ROHM Co., Ltd. All rights reserved.

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Block Diagram

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Block Diagram Descriptions

・

PD

Photo diode with approximately human eye response.

・

AMP

Integration-OPAMP for converting from PD current to Voltage.

・

ADC

AD converter for obtainment Digital 16bit data.

・

Logic + I

Ambient Light Calculation and I

Data Register → This is for registration of Ambient Light Data. Initial Value is "0000_0000_0000_0000".

Measurement Time Register → This is for registration of measurement time. Initial Value is "0100_0101".

・

OSC

Internal Oscillator ( typ. 320kHz ). It is CLK for internal logic.

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Measurement Procedure

* "Power On" Command is possible to omit.

SCL

SDA

GND

ADDR

PD

VCC

DVI

Logic

+

I

ADC

AMP

OSC

State Transition by I

Automatically State Transition

State is automatically changed to

Power Down mode.

Power supply

Power Down

Power On

Measurement Command

Initial state is Power Down mode after

VCC and DVI supply.

One Time Measurement

Continuous Measurement