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PDF BH1751FVI Data sheet ( Hoja de datos )
| Número de pieza | BH1751FVI | |
| 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
BH1751FVI
No.10046EAT09
●Descriptions
BH1751FVI 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.
14) Build in power on reset circuit
●Applications
Mobile phone, LCD TV, NOTE PC, Portable game machine, Digital camera, Digital video camera, Car navigation, PDA,
LCD display
●Absolute Maximum Ratings
Parameter
Symbol
Limits
Supply Voltage
Vmax
4.5
Operating Temperature
Topr
-40～85
Storage Temperature
Tstg
-40～100
SDA Sink Current
Imax
7
Power Dissipation
Pd
260※
※ 70mm × 70mm × 1.6mm glass epoxy board. Derating in done at 3.47mW/℃ for operating above Ta=25℃.
Units
V
℃
℃
mA
mW
●Operating Conditions
Parameter
VCC Voltage
I2C Reference Voltage
Symbol
Vcc
VDVI
Min. Typ. Max. Units
2.4 3.0 3.6
V
1.65 - VCC V
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/16
2010.02 - Rev.A
1 page  
BH1751FVI
●Instruction Set Architecture
Instruction
Power Down
Opecode
0000_0000
No active state.
Technical Note
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Comments
Power On
0000_0001
Waiting for measurement command.
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.
0000_0111
Reset Data register value. Reset command is not acceptable in
Power Down mode.
0001_0000
Start measurement at 1lx resolution.
Measurement Time is typically 120ms.
0001_0001
Start measurement at 0.5lx resolution.
Measurement Time is typically 120ms.
0001_0011
0010_0000
0010_0001
0010_0011
01000_MT[7,6,5]
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."
011_MT[4,3,2,1,0] Change measurement time.
※ Please refer "adjust measurement result for influence of optical window."
●Measurement mode explanation
Measurement Mode
H-resolution Mode2
H-Resolution Mode
L-Resolution Mode
Measurement Time.
Typ. 120ms.
Typ. 120ms.
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 and BH1751FVI becomes power down during DVI = 'L'. Initial reset is not necessary, because power
on reset function is included in this product.
2) Reset command
Reset command is for only reset Illuminance data register. ( reset value is '0' )It is not necessary after power supply to
VCC because power on reset function is included in this product.
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
© 2010 ROHM Co., Ltd. All rights reserved.
5/16
2010.02 - Rev.A
5 Page 
BH1751FVI
Technical Note
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●H-Resolution Mode2
H-resolution mode2 is 0.5lx (typ.) resolution mode. It is suitable if under less than 10 lx measurement data is necessary.
This measurement mode supports “Adjust measurement result for influence of optical window ". Please refer it. It is possible
to detect min. 0.11 lx by using H-resolution mode2.
○Instruction set architecture for H-resolution mode2
Instruction
Opecode
Continuously H-Resolution Mode2 0001_0001
One Time H-Resolution Mode2
0010_0001
Comments
Start measurement at 0.5lx resolution.
Measurement Time is typically 120ms.
Start measurement at 0.5lx resolution.
Measurement Time is typically 120ms.
It is automatically set to Power Down mode after measurement.
○Measurement sequence example from "Write instruction" to "Read measurement result"
ex) Continuously H-resolution mode2 ( ADDR = 'L' )
from Master to Slave
from Slave to Master
① Send "Continuously H-resolution mode2 " instruction
ST 0100011
0 Ack
00010001
Ack SP
② Wait to complete 1st H-resolution mode2 measurement.( max. 180ms. )
③ Read measurement result.
ST 0100011
1 Ack
High Byte [15:8]
214 213 212 211 210 29 28 27
Ack
Low Byte [7:0]
26 25 24 23 22 21 20 2-1
Ack SP
How to calculate when the data High Byte is "00000000" and Low Byte is "00010010"
( 23+ 20 ) / 1.2 ≒ 7.5 [ lx ]
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/16
2010.02 - Rev.A
11 Page | ||
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