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PDF BH1715FVC Data sheet ( Hoja de datos )
| Número de pieza | BH1715FVC | |
| Descripción | Digital 16bit Serial Output Type Ambient Light Sensor IC | |
| Fabricantes | ROHM Semiconductor | |
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Ambient Light Sensor ICs
Digital 16bit Serial Output Type
Ambient Light Sensor IC
BH1715FVC
No.10046EBT06
●Descriptions
BH1715FVC is an digital Ambient Light Sensor IC for I2C bus interface. BH1715FVC 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. 0.23 lx, max. 100000 lx by using this function.)
12) Small measurement variation (+/- 15%)
●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
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
VCC Voltage
I2C Reference Voltage
Symbol
Vcc
VDVI
Ratings
Min. Typ.
2.4 3.0
1.65 －
Max.
3.6
VCC
mW
Units
V
V
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/16
2010.06 - Rev.B
1 page  
BH1715FVC
●Instruction Set Architecture
Instruction
Power Down
Opecode
0000_0000 No active state.
Comments
Technical Note
www.DataSheet4U.com
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 L-Resolution Mode
0001_0011
Start measurement at 4lx resolution.
Measurement Time is typically 16ms.
One Time H-Resolution Mode
One Time L-Resolution Mode
0010_0000
0010_0011
Start measurement at 1lx 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
(High bit)
01000_MT[7,6,5]
Change measurement time.
※ Please refer "adjust measurement result for influence of optical window."
Change Measurement time
(Low bit)
※ Don't input the other opecode.
011_MT[4,3,2,1, Change measurement time.
0] ※ Please refer "adjust measurement result for influence of optical window."
●Measurement mode explanation
Measurement Mode
H-Resolution Mode
L-Resolution Mode
Measurement Time.
Typ. 120ms.
Typ. 16ms.
Resolution
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 lx resolution so that it is suitable for darkness (less than 10 lx)
●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
© 2010 ROHM Co., Ltd. All rights reserved.
5/16
2010.06 - Rev.B
5 Page 
BH1715FVC
Technical Note
www.DataSheet4U.com
●Adjust measurement result for influence of optical window. ( sensor sensitivity adjusting )
BH1715FVC 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 regisiter ). 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
0001_0000
Ack SP
※This example is High Resolution mode, but it accepts the other measurement.
4) After about 240ms, measurement result is registered to Data Register.
(High Resolution mode is typically 120ms, but measurement time is set twice.)
The below table is seeing the changable range of MTreg.
Min.
changable
binary
0001_1111
( sensitivity : default * 0.45 )
range of MTreg decimal
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.
The below formula is to calculate illuminance per 1 count.
Illuminance per 1 count ( lx / count )
= 1 / 1.2 *( 69 / X )
1.2 : Measurement accuracy
69 : Default value of MTreg ( dec )
X : MTreg value
The below table is seeing the detail of resolution.
MTreg value
0001_1111
0100_0101
1111_1110
lx / count
1.85
0.83
0.23
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/16
2010.06 - Rev.B
11 Page | ||
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