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www.rohm.com

2011.11 - Rev.D

Ambient Light Sensor IC Series

Digital 16bit Serial Output Type

Ambient Light Sensor IC

BH1750FVI

●Descriptions

BH1750FVI is an digital Ambient Light Sensor IC for I

C bus interface. This IC is the most suitable to obtain the ambient light

data for adjusting LCD and Keypad backlight power of Mobile phone. It is possible to detect wide range at High resolution.

( 1 - 65535 lx ).

●Features

1) I

C bus Interface ( f / s Mode Support )

2) Spectral responsibility is approximately human eye response

3) Illuminance to Digital Converter

4) Wide range and High resolution. ( 1 - 65535 lx )

5) Low Current by power down function

6) 50Hz / 60Hz Light noise reject-function

7) 1.8V Logic input interface

8) No need any external parts

9) Light source dependency is little. ( ex. Incandescent Lamp. Fluorescent Lamp. Halogen Lamp. White LED. Sun Light )

10) It is possible to select 2 type of I

C slave-address.

11) Adjustable measurement result for influence of optical window

( It is possible to detect min. 0.11 lx, max. 100000 lx by using this function. )

12) Small measurement variation (+/- 20%)

13) The influence of infrared is very small.

●Applications

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

LCD display

●Absolute Maximum Ratings

Parameter Symbol Ratings Units

Supply Voltage Vmax

4.5 V

Operating Temperature Topr -40～85 ℃

Storage Temperature Tstg -40～100 ℃

SDA Sink Current Imax 7 mA

Power Dissipation Pd 260

※

※ 70mm × 70mm × 1.6mm glass epoxy board. Derating in done at 3.47mW/℃ for operating above Ta=25℃.

●Operating Conditions

Parameter Symbol

Ratings

Units

Min. Typ. Max.

VCC Voltage Vcc 2.4 3.0 3.6 V

C Reference Voltage VDVI 1.65 - VCC V

No.11046EDT01

BH1750FVI

Technical Note

2/17

www.rohm.com

2011.11 - Rev.D

●Electrical Characteristics ( VCC = 3.0V, DVI = 3.0V, Ta = 25℃, unless otherwise noted )

Parameter Symbol

Limits

Units Conditions

Min. Typ. Max.

Supply Current Icc1 － 120 190 µA Ev = 100 lx

※

Powerdown Current Icc2 － 0.01 1.0 µA No input Light

Peak Wave Length λp － 560 － nm

Measurement Accuracy S/A 0.96 1.2 1.44 times

Sensor out / Actual lx

EV = 1000 lx

※

Dark ( 0 lx ) Sensor out S0 0 0 3 count H-Resolution Mode

※

H-Resolution Mode Resolution rHR － 1 － lx

L-Resolution Mode Resolution rLR － 4 － lx

H-Resolution Mode

Measurement Time

tHR － 120 180 ms

L-Resolution Mode

Measurement Time

LR － 16 24 ms

Incandescent /

Fluorescent Sensor out ratio

F － 1 － times

EV = 1000 lx

ADDR Input ‘H’ Voltage VAH 0.7 * VCC －－ V

ADDR Input ‘L’ Voltage VAL －－ 0.3 * VCC V

DVI Input ‘L’ Voltage VDVL －－ 0.4 V

SCL, SDA Input ‘H’ Voltage 1 VIH1 0.7 * DVI －－ V DVI ≧ 1.8V

SCL, SDA Input ‘H’ Voltage 2 VIH2 1.26 －－ V 1.65V ≦ DVI ＜1.8V

SCL, SDA Input ‘L’ Voltage 1 VIL1 －－ 0.3 * DVI V DVI ≧ 1.8V

SCL, SDA Input ‘L’ Voltage 2 VIL2 －－ DVI – 1.26 V 1.65V ≦ DVI ＜ 1.8V

SCL, SDA, ADDR

Input ‘H’ Current

－－

10 µA

SCL, SDA, ADDR

Input ‘L’ Current

－－

10 µA

C SCL Clock Frequency fSCL

－－

400 kHz

C Bus Free Time tBUF 1.3

－

－ µs

C Hold Time ( repeated )

START Condition

HDSTA 0.6

－

－ µs

C Set up time

for a Repeated START Condition

SUSTA 0.6

－

－ µs

C Set up time

for a Repeated STOP Condition

tSUSTD 0.6

－

－ µs

C Data Hold Time tHDDAT 0

－

0.9 µs

C Data Setup Time tSUDAT 100

－

－ ns

C ‘L’ Period of the SCL Clock tLOW 1.3

－

－ µs

C ‘H’ Period of the SCL Clock tHIGH 0.6

－

－ µs

C SDA Output ‘L’ Voltage VOL 0

－

0.4 V IOL = 3 mA

※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.

BH1750FVI

Technical Note

5/17

www.rohm.com

2011.11 - Rev.D

●Instruction Set Architecture

Instruction Opecode Comments

Power Down 0000_0000

No active state.

Power On 0000_0001

Waiting for measurement command.

Reset 0000_0111

Reset Data register value. Reset command is not acceptable in

Power Down mode.

Continuously H-Resolution Mode 0001_0000

Start measurement at 1lx resolution.

Measurement Time is typically 120ms.

Continuously H-Resolution Mode2 0001_0001

Start measurement at 0.5lx resolution.

Measurement Time is typically 120ms.

Continuously L-Resolution Mode 0001_0011

Start measurement at 4lx resolution.

Measurement Time is typically 16ms.

One Time H-Resolution Mode 0010_0000

Start measurement at 1lx resolution.

Measurement Time is typically 120ms.

It is automatically set to Power Down mode after measurement.

One Time H-Resolution Mode2 0010_0001

Start measurement at 0.5lx resolution.

Measurement Time is typically 120ms.

It is automatically set to Power Down mode after measurement.

One Time L-Resolution Mode 0010_0011

Start measurement at 4lx resolution.

Measurement Time is typically 16ms.

It is automatically set to Power Down mode after measurement.

Change Measurement time

( High bit )

01000_MT[7,6,5]

Change measurement time.

※ Please refer "adjust measurement result for influence of optical window."

Change Masurement time

( Low bit )

011_MT[4,3,2,1,0]

Change measurement time.

※ Please refer "adjust measurement result for influence of optical window."

※ Don't input the other opecode.

●Measurement mode explanation

Measurement Mode Measurement Time. Resolurtion

H-resolution Mode2 Typ. 120ms. 0.5 lx

H-Resolution Mode Typ. 120ms. 1 lx.

L-Resolution Mode Typ. 16ms. 4 lx.

We recommend to use H-Resolution Mode.

Measurement time ( integration time ) of H-Resolution Mode is so long that some kind of noise( including in 50Hz / 60Hz

noise ) is rejected. And H-Resolution Mode is 1 l x resolution so that it is suitable for darkness ( less than 10 lx )

H-resolution mode2 is also suitable to detect for darkness.

●Explanation of Asynchronous reset and Reset command "0000_0111"

1) Asynchronous reset

All registers are reset. It is necessary on power supply sequence. Please refer "Timing chart for VCC and DVI power

supply sequence" in this page. It is power down mode during DVI = 'L'.

2) Reset command

Reset command is for only reset Illuminance data register. ( reset value is '0' ) It is not necessary even power supply

sequence.It is used for removing previous measurement result. This command is not working in power down mode, so

that please set the power on mode before input this command.

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