Ambient Light Sensor ICs
Digital 16bit Serial Output Type
Ambient Light Sensor IC
BH1715FVC
No.10046EBT06
●Descriptions
2
BH1715FVC is an digital Ambient Light Sensor IC for I C 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
2
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)
2
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. 0.23 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
Supply Voltage
Operating Temperature
Storage Temperature
SDA Sink Current
Power Dissipation
Symbol
Vmax
Topr
Tstg
Imax
Pd
Ratings
4.5
-40½85
-40½100
7
260
※
Units
V
℃
℃
mA
mW
※
70mm
×
70mm
×
1.6mm glass epoxy board. Derating in done at 3.47mW/℃ for operating above Ta=25℃.
●Operating
Conditions
Parameter
V
CC
Voltage
I
2
C Reference Voltage
Symbol
Vcc
V
DVI
Ratings
Min.
2.4
1.65
Typ.
3.0
－
Max.
3.6
V
CC
Units
V
V
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© 2010 ROHM Co., Ltd. All rights reserved.
1/16
2010.06 - Rev.B
BH1715FVC
●Electrical
Characteristics (V
CC
= 3.0V, DVI = 3.0V, Ta = 25℃, unless otherwise noted)
Limits
Parameter
Symbol
Min.
Typ.
Max.
Supply Current
Powerdown Current
Peak Wave Length
Measurement Accuracy
Dark (0 lx) Sensor out
H-Resolution Mode Resolution
L-Resolution Mode Resolution
H-Resolution Mode Measurement Time
L-Resolution Mode Measurement Time
Incandescent
/ Fluorescent Sensor out ratio
ADDR Input ‘H’ Voltage
ADDR Input ‘L’ Voltage
DVI Input ‘L’ Voltage
SCL, SDA Input ‘H’ Voltage 1
SCL, SDA Input ‘H’ Voltage 2
SCL, SDA Input ‘L’ Voltage 1
SCL, SDA Input ‘L’ Voltage 2
SCL, SDA, ADDR Input ‘H’ Current
SCL, SDA, ADDR Input ‘L’ Current
I
2
C SCL Clock Frequency
I
2
C Bus Free Time
I
2
C Hold Time (repeated)
START Condition
I
2
C Set up time for a Repeated
START Condition
I
2
C Set up time for a Repeated
STOP Condition
I
2
C Data Hold Time
I
2
C Data Setup Time
I
2
C ‘L’ Period of the SCL Clock
I
2
C ‘H’ Period of the SCL Clock
I
2
C SDA Output ‘L’ Voltage
Icc1
Icc2
λp
S/A
S0
rHR
rLR
tHR
tLR
rIF
VAH
VAL
VDVL
VIH1
VIH2
VIL1
VIL2
IIH
IIL
fSCL
tBUF
tHDSTA
tSUSTA
tSUSTD
tHDDAT
tSUDAT
tLOW
tHIGH
VOL
－
－
－
1.02
0
－
－
－
－
－
0.7 * V
CC
－
－
0.7 * DVI
1.26
－
－
－
－
－
1.3
0.6
0.6
0.6
0
100
1.3
0.6
0
120
0.01
560
1.2
0
1
4
120
16
1
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
190
1.0
－
1.38
2
－
－
180
24
－
－
0.3 * V
CC
0.4
－
－
0.3 * DVI
DVI-1.26
10
10
400
－
－
－
－
0.9
－
－
－
0.4
Technical Note
Units
µA
µA
nm
times
count
lx
lx
ms
ms
times
V
V
V
V
V
V
V
µA
µA
kHz
µs
µs
µs
µs
µs
ns
µs
µs
V
Conditions
Ev = 100 lx
※
1
No input Light
Sensor out / Actual lx
1, 2
EV = 1000 lx
※ ※
H-Resolution Mode
※
3
EV = 1000 lx
DVI
≧
1.8V
1.65V
≦
DVI
＜
1.8V
DVI
≧
1.8V
1.65V
≦
DVI
＜
1.8V
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 if dark data (less than 10 lx) is need.
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© 2010 ROHM Co., Ltd. All rights reserved.
2/16
2010.06 - Rev.B
BH1715FVC
●Reference
Data
1.2
Technical Note
64
56
100000
1
Measurement Result
0.8
40
32
24
16
8
0
Measurement Result
48
10000
1000
Ratio
0.6
H-Res.
H-Res.
L-Res.
100
0.4
10
0.2
L-Res.
1
0
8
16
0
400
500
600
700
800
900
1000
1100
Wavelength [ nm ]
Illuminance [ lx ]
24
32
40
48
56
64
1
10
100
1000
10000
100000
Illuminance [ lx ]
Fig.1 Spectral Response
1.2
1
0.8
1.2
1
Fig.2 Illuminance –
Measurement Result 1
10
Fig.3 Illuminance –
Measurement Result 2
8
1pin
-
+
受信指向角特性
0.8
Measurement Result
Ratio
Ratio
6
0.6
0.4
-
+
0.6
0.4
0.2
0
-
-
蛍光灯½熱灯感度比
1pin
4
0.2
0
-90
-60
-30
0
30
60
90
+
+
-90
-60
-30
0
30
60
90
2
H-Res.
0
-40
-10
20
50
80
110
Angle [ deg ]
Angle [ deg ]
Ta [
℃
]
Fig.4 Directional Characteristics 1
Fig.5 Directional Characteristics 2
Fig.6 Dark Response
1.2
1
0.8
Fluorescent
Light
200
Ratio
0.6
0.4
0.2
0
-40
-10
20
50
80
110
Halogen
Light
Kripton Light
Artifical Sun
Light
White LED
0
0.5
1
1.5
2
ICC @ Measurement
Incandescent
Light
150
VCC vs. ICC@測定
中
100
50
0
2
2.5
3
VCC [ V ]
3.5
4
Ta [
℃
]
Ratio
Fig.7 Measurement Result
Temperature Dependency
10
Fig.8 Light Source Dependency
( Fluorescent Light is set to '1' )
1.2
Fig.9 V
CC
– I
CC
( During measurement )
1.2
ICC @ POWER DOWN [ uA ]
1
1
1
DVI=1.8V
0.8
VCC=3V
0.8
Ratio
0.6
Ratio
2
2.5
3
3.5
4
0.6
0.1
0.4
0.4
0.2
0.2
0.01
-40
-20
0
20
40
60
80
0
0
Ta [
℃
]
VCC [ V ]
1.5
2
Fig.10 V
CC
– I
CC
@0 Lx
( POWER DOWN )
Fig.11 Measurement Result
VCC Dependency
DVI [ V ]
2.5
3
3.5
Fig.12 Measurement Result
DVI Dependency
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© 2010 ROHM Co., Ltd. All rights reserved.
3/16
2010.06 - Rev.B
BH1715FVC
●Block
Diagram
VCC
DVI
Technical Note
AMP
ADC
Logic
+
2
I C Interface
SCL
SDA
PD
OSC
GND
ADDR
●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.
2
●Logic
+ I C Interface
2
Ambient Light Calculation and I C BUS Interface. It is including below register.
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.
●Measurement
Procedure
Power supply
State is automatically changed to
Power Down mode.
Power Down
Initial state is Power Down mode after
VCC and DVI supply.
Power On
Measurement Command
One Time Measurement
Continuous Measurement
State Transition by I
2
C write-command.
Automatically State Transition
* "Power On" Command is possible to omit.
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© 2010 ROHM Co., Ltd. All rights reserved.
4/16
2010.06 - Rev.B
BH1715FVC
●Instruction
Set Architecture
Instruction
Power Down
Opecode
0000_0000
No active state.
Comments
Technical Note
Power On
0000_0001
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 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 4lx resolution.
Measurement Time is typically 16ms.
It is automatically set to Power Down mode after measurement.
Reset
0000_0111
Continuously H-Resolution Mode
0001_0000
Continuously L-Resolution Mode
0001_0011
One Time H-Resolution Mode
0010_0000
One Time L-Resolution Mode
Change Measurement time
(High bit)
Change Measurement time
(Low bit)
※
Don't input the other opecode.
0010_0011
01000_MT[7,6,5] Change measurement time.
※
Please refer "adjust measurement result for influence of optical window."
011_MT[4,3,2,1, Change measurement time.
※
Please refer "adjust measurement result for influence of optical window."
0]
●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.
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© 2010 ROHM Co., Ltd. All rights reserved.
5/16
2010.06 - Rev.B
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