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PDF BH1750FVI Data sheet ( Hoja de datos )
| Número de pieza | BH1750FVI | |
| Descripción | Digital 16bit Serial Output Type Ambient Light Sensor IC | |
| Fabricantes | ROHM Semiconductor | |
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Ambient Light Sensor IC Series
Digital 16bit Serial Output Type
Ambient Light Sensor IC
BH1750FVI
No.11046EDT01
●Descriptions
BH1750FVI is an digital Ambient Light Sensor IC for I2C 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) I2C 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 I2C 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※
mW
※ 70mm × 70mm × 1.6mm glass epoxy board. Derating in done at 3.47mW/℃ for operating above Ta=25℃.
●Operating Conditions
Parameter
VCC Voltage
I2C Reference Voltage
Ratings
Symbol
Units
Min. Typ. Max.
Vcc 2.4 3.0 3.6 V
VDVI
1.65
-
VCC
V
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/17
2011.11 - Rev.D
1 page  
BH1750FVI
Technical Note
●Instruction Set Architecture
Instruction
Power Down
Power On
Reset
Continuously H-Resolution Mode
Continuously H-Resolution Mode2
Continuously L-Resolution Mode
One Time H-Resolution Mode
One Time H-Resolution Mode2
One Time L-Resolution Mode
Change Measurement time
( High bit )
Change Masurement time
( Low bit )
※ Don't input the other opecode.
Opecode
Comments
0000_0000
0000_0001
0000_0111
0001_0000
0001_0001
0001_0011
0010_0000
0010_0001
0010_0011
01000_MT[7,6,5]
011_MT[4,3,2,1,0]
No active state.
Waiting for measurement command.
Reset Data register value. Reset command is not acceptable in
Power Down mode.
Start measurement at 1lx resolution.
Measurement Time is typically 120ms.
Start measurement at 0.5lx resolution.
Measurement Time is typically 120ms.
Start measurement at 4lx resolution.
Measurement Time is typically 16ms.
Start measurement at 1lx resolution.
Measurement Time is typically 120ms.
It is automatically set to Power Down mode after measurement.
Start measurement at 0.5lx resolution.
Measurement Time is typically 120ms.
It is automatically set to Power Down mode after measurement.
Start measurement at 4lx resolution.
Measurement Time is typically 16ms.
It is automatically set to Power Down mode after measurement.
Change measurement time.
※ Please refer "adjust measurement result for influence of optical window."
Change measurement time.
※ Please refer "adjust measurement result for influence of optical window."
●Measurement mode explanation
Measurement Mode
Measurement Time.
H-resolution Mode2
Typ. 120ms.
H-Resolution Mode
Typ. 120ms.
L-Resolution Mode
Typ. 16ms.
Resolurtion
0.5 lx
1 lx.
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.
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
5/17
2011.11 - Rev.D
5 Page 
BH1750FVI
Technical Note
●Adjust measurement result for influence of optical window. (sensor sensitivity adjusting )
BH1750FVI is possible to change sensor sensitivity. And it is possible to cancel the optical window influence (difference with
/ without optical window) by using this function. Adjust is done by changing measurement time. For example, when
transmission rate of optical window is 50% (measurement result becomes 0.5 times if optical window is set), influence of
optical window is ignored by changing sensor sensitivity from default to 2 times
Sensor sensitivity is shift by changing the value of MTreg (measurement time register). MTreg value has to set 2 times if
target of sensor sensitivity is 2 times. Measurement time is also set 2 times when MTreg value is changed from default to 2
times.
ex) Procedure for changing target sensor sensitivity to 2 times.
Please change Mtreg from ”0100_0101” ( default ) to ”1000_1010” ( default * 2 ).
1) Changing High bit of MTreg
ST Slave Address
R/W
0
Ack
01000_100
Ack SP
2) Changing Low bit of MTreg
ST Slave Address
R/W
0
Ack
011_01010
Ack SP
3) Input Measurement Command
ST
Slave Address
R/W
0
Ack
* This example is High Resolution mode, but it accepts the other measurement.
0001_0000
4) After about 240ms, measurement result is registered to Data Register.
( High Resolution mode is typically 120ms, but measurement time is set twice. )
Ack SP
The below table is seeing the changable range of MTreg.
changeable
binary
range of MTreg decimal
Min.
0001_1111
( sensitivity : default * 0.45 )
31
( sensitivity : default * 0.45 )
Typ.
0100_0101
default
69
default
Max.
1111_1110
( sensitivity : default * 3.68 )
254
( sensitivity : default * 3.68 )
It is possilbe to detect 0.23lx by using this function at H-resolution mode. And it is possilbe to detect 0.11lx by using this
function at H-resolution mode2.
The below formula is to calculate illuminance per 1 count.
H-reslution mode : Illuminance per 1 count ( lx / count ) = 1 / 1.2 *( 69 / X )
H-reslution mode2 : Illuminance per 1 count ( lx / count ) = 1 / 1.2 *( 69 / X ) / 2
1.2 : Measurement accuracy
69 : Default value of MTreg ( dec )
X : MTreg value
The below table is seeing the detail of resolution.
Mtreg の値
0001_1111
0100_0101
1111_1110
lx / count
at H-resolutin mode
1.85
0.83
0.23
lx / count
at H-resolution mode2
0.93
0.42
0.11
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
11/17
2011.11 - Rev.D
11 Page | ||
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