Ambient Light Sensor IC Series
Analog Current Output Type
Ambient Light Sensor IC
BH1600FVC
No.10046EBT04
●Descriptions
BH1600FVC is an analog current output ambient light sensor. BH1600FVC is the most suitable to obtain the ambient light
data for adjusting LCD and Keypad backlight of Mobile phone for power saving and better visibility
●Features
1) Compact surface mount package 3.0
×
1.6 mm
2) Spectral sensitivity close to human eyes sensitivity.
3) Output current in proportion to brightness.
4) Minimum supply voltage 2.4V
5) Built-in shutdown function
6) 2 steps controllable output current gain.
7) 1.8V logic input interface
●Applications
Mobile phone, LCD TV, PDP TV, Laptop PC, Portable game console, Digital camera, Digital video camera, Car navigation,
PDA, LCD display
●Absolute
Maximum Ratings
Parameter
Supply Voltage
Operating Temperature
Storage Temperature
Iout Current
Power Dissipation
Symbol
Vmax
Topr
Tstg
Ioutmax
Pd
Limits
4.5
-30½85
-40½100
7.5
260
※
Units
V
℃
℃
mA
mW
※
70mm × 70mm × 1.6mm glass epoxy board. Derating at 3.47mW/℃ for operating above Ta=25℃.
●Operating
Conditions
Parameter
V
CC
Voltage
Symbol
Vcc
Min.
2.4
Typ.
3.0
Max.
3.6
Units
V
●Electrical
Characteristics
( V
CC
= 3.0V, Ta = 25℃, unless otherwise noted )
Parameter
Symbol
Min.
Typ.
Max.
Supply Current
Icc1
39
64
90
Shutdown Current
Icc2sd
-
0.01
0.2
Dark Current
Idark
-
-
0.1
Light Current
Iout
39
60
81
Peak Wave Length
λp
-
560
-
Incandescent/Fluorescent
rIF
-
1.0
-
Light Current Ratio
Saturated Output Voltage
GC1, GC2 Input ‘L’ Voltage
GC1,GC2 Input ‘H’ Voltage
Wake-up Time
Gain Ratio
H-Gain Mode / L-Gain Mode
※
White LED is used as optical source
Units
µA
µA
µA
µA
nm
times
V
V
V
µs
times
Conditions
Ev=100 lx ( H-Gain Mode )
※
V
GC1
=V
GC2
=0 No Input Light
Ev=0 lx
Ev=100 lx ( H-Gain Mode )
※
Ev=100 lx
Ev=100 lx, RL=220kΩ
( H-Gain Mode )
※
Vomax
V
IL
V
IH
twu
2.6
0
1.4
-
-
2.9
-
-
64
9.5
3.0
0.4
Vcc
128
10
Shutdown
→
H-Gain Mode
Ev=100lx
※
Ev=100 lx
※
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© 2010 ROHM Co., Ltd. All rights reserved.
1/8
2010.03 - Rev.B
BH1600FVC
●Reference
Data
1.2
Fluorescent
Light
Technical Note
100000
10000
1000
1
Incandescent
Light
Halogen
Light
H-Gain
L-Gain
IOUT [ uA ]
0.8
100
10
1
0.1
0.01
Ratio
0.6
Kripton Light
0.4
Artifical Sun
Light
0.2
White LED
0
400
500
600
700
800
900
1000
1100
0
0.5
1
1.5
2
0.001
0.01
0
1
100
10,000
1,000,000
Wavelength [ nm ]
Ratio
Illuminance [ lx ]
Fig.1 Spectral Response
1.2
1
Fig.2 Light Source Dependency
(Fluorescent Light is set to '1')
1.2
1
Fig.3 Illuminance – I
OUT
Characteristics
100
10
IOUT [ uA ]
1pin
0.8
-
+
受信指向角特性
0.8
暗電流温特
-
-
1
0.1
0.01
Ratio
0.6
0.4
-
+
Ratio
0.6
0.4
+
1pin
H-Gain
L-Gain
SD
0.2
0
-90
-60
-30
0
30
60
90
0.2
+
0.001
-30
0
30
Ta [ ℃ ]
60
90
60
90
0
-90
-60
-30
0
30
Angle [ deg ]
Angle [ deg ]
Fig.4 Directional Characteristics 1
Fig.5 Directional Characteristics 2
Fig.6 Ta – I
OUT
(0 lx)
100
1.4
1.2
1
1.4
1.2
1
0.8
10
ICC [ uA ]
1
Ratio
0.1
H-Gain
L-Gain
Ratio
-30
0
30
60
90
0.8
0.6
0.4
0.2
0.6
0.4
0.2
0
2
2.5
3
3.5
4
0.01
SD
0.001
-30
0
0
Ta [ ℃ ]
30
60
90
Ta [
℃
]
VCC [ V ]
Fig.7 Ta – I
CC
(0 lx)
Fig.8 I
OUT
Temperature dependency(100 lx)
Fig.9 I
OUT
V
CC
dependency
10000
WakeupTime [ us ]
1000
L-Gain
100
10
H-Gain
1
100
1000
Illuminance
[ lx ]
10000
Fig.10 Illuminance – Wake up Time
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© 2010 ROHM Co., Ltd. All rights reserved.
2/8
2010.03 - Rev.B
BH1600FVC
●Block
Diagram
VCC
Technical Note
GC1
Logic
GC2
PD
Current
Amp
IOUT
R1
C1
GND
●Block
Diagram Descriptions
●PD
Photo diode close to human eyes sensitivity.
●Current
AMP
To amplify Photo diode current ( H-Gain / L-Gain )
Gain controllable in 2 steps by input voltage from GC1 and GC2.
●Logic
Logic block for mode setting by input voltage from GC1 and GC2
●Mode
Setting
GC2
0
0
1
1
GC1
0
1
0
1
Mode
Shutdown
H-Gain Mode
L-Gain Mode
Test Mode ( Input prohibition )
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© 2010 ROHM Co., Ltd. All rights reserved.
3/8
2010.03 - Rev.B
BH1600FVC
●External
parts Setting
1) Gain setting of BH1600FVC
Please select the best gain controlled by 5 and 6pin based on the required illuminance range.
The reference is as follows.
Illuminance detection range [lx]
~ 500
~50000
Gain Mode
H-Gain Mode
L-Gain Mode
Technical Note
This device will be mounted under the optical window in actual designing. Therefore, there is a possibility that the
illuminace to ALS( Ambient Light Sensor) will be less than the illuminance on the final product surface.
Please consider the attenuation of light through the optical window.
It is possible to detect illuminance up to about 5000 lx even in the H-Gain mode. However, the maximum output current
is about 3mA in this case. If you want to minimize consumption current, please use the L-Gain mode as much as possible.
Please set output resistance value( R1) within the range of 1 kΩ ~ 1MΩ which needs to be smaller than the input
impedance of the next circuit.
2) Approximate formula of IOUT output voltage in each Gain Mode
(1) H-Gain mode
The output voltage is calculated as below.
-6
Viout= 0.6 x 10 x Ev x R1
Viout is IOUT output voltage [V]. Ev is an illuminance of the ALS surface [lx].
R1 is IOUT output resistor[Ω].
(For example) In case you want to convert the illuminance value up to 500 lx by ADC.
If the maximum voltage of ADC input is 2V, output resistor value will be as below.
-6
R1 = Viout/(0.6 x 10 x Ev)
-6
= 2 /(0.6 x 10 x 500) = 6667[Ω]
⇒6.8[kΩ]
(2) L-Gain mode
The output voltage is calculated as follows.
-6
Viout= 0.063 x 10 x Ev x R1
3) C1
(1) To reject the flicker light..
In case IOUT output is R1 only and an ALS receives the artificial lights such as fluorescent lamps and incandescent
lamps synchronized with 50/60 Hz of AC power supplies, the output current has a ripple. If you want to reject this ripple,
please add C1 to R1 in parallel. Please set it to C1 x R1 = about 0.1 as a time constant.
(2) To control backlight smoothly by using illuminance value.
C1 is effective to control backlight smoothly for a rapid changing of the illuminance. In this case, please set it to C1 x R1
= about 1 ~ 10 as a time constant. It is not necessary if you average illuminance value with software to change backlight
smoothly.
Please note that the rise time becomes slow at power-on and recovery from shutdown mode to operation mode.
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© 2010 ROHM Co., Ltd. All rights reserved.
4/8
2010.03 - Rev.B
BH1600FVC
●Terminal
Descriptions
Pin No.
Pin Name
V
CC
Technical Note
Equivalent Circuit
Function
1
IOUT
This terminal outputs current depending on
illuminance level.
Use this pin by putting resistor between
GND.
2
GND
GND Terminal
3
VCC
Power Supply Terminal
4
NC
NC( Non connection)Terminal
Open or short to GND
V
CC
5
GC1
Mode Setting Terminal 1
V
CC
6
GC2
Mode Setting Terminal 2
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© 2010 ROHM Co., Ltd. All rights reserved.
5/8
2010.03 - Rev.B
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