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Ambient Light Sensor IC Series
Analog Current Output Type
Ambient Light Sensor IC
BH1621FVC
●Descriptions
BH1621FVC is an analog current output ambient light sensor. This IC 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 1.6 × 1.6 mm
2) Spectral sensitivity close to human eyes sensitivity.
3) Output current in proportion to brightness.
4) Supply voltage operates from 2.4V to 5.5V
5) Built-in shutdown function
6) 2 steps controllable output current gain.
7) 1.8V logic input interface
8) Low sensitivity variation (+/-15%)
●Applications
Mobile phone, LCD TV, PDP TV, Laptop PC, Portable game console, Digital camera, Digital video camera, PDA,
LCD display
●Absolute Maximum Ratings
Parameter Symbol Ratings Units
Supply Voltage Vmax 7 V
Operating Temperature Topr -40~85 ℃
Storage Temperature Tstg -40~100 ℃
Iout Current Ioutmax 7.5 mA
Power Dissipation Pd 165※ mW
※ 70mm × 70mm × 1.6mm glass epoxy board. Derating at 2.2 mW/℃ for operating above Ta=25℃.
●Operating Conditions
Parameter Symbol
Ratings Units
Min. Typ. Max.
VCC Voltage Vcc 2.4 3.0 5.5 V
No.12046EDT02
BH1621FVC
Technical Note
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●Electrical Characteristics ( VCC = 3.0V, Ta = 25℃, unless otherwise noted )
Parameter Symbol
Limits Units Conditions
Min. Typ. Max.
Supply Current1 ( Operate ) Icc1 51 74 97 µA Ev=100 lx ( H-Gain Mode ) ※
Supply Current2 ( 0 lx ) Icc2 4.5 9 13.5 µA Ev=0 lx ( H-Gain Mode )
Supply Current3 ( Shutdown ) Icc3sd - 0.2 0.4 µA VGC1=V GC2=0 No Input Light
IOUT Output Current1
( Dark Current ) Iout1 - - 0.2 µA Ev=0 lx
IOUT Output Current2 Iout2 51 60 69 µA Ev=100 lx ( H-Gain Mode ) ※
Peak Wave Length λp - 560 - nm
Incandescent/Fluorescent
Light Current Ratio rIF - 1.0 - times Ev=100 lx
Saturated Output Voltage VOMAX 2.6 2.9 3.0 V
Ev=100 lx, RL=220kΩ
( H-Gain Mode ) ※
GC1,GC2 Input 'L' Voltage VIL 0 - 0.4 V
GC1,GC2 Input 'H' Voltage1 VIH1 1.4 - Vcc V 2.4V ≦ Vcc ≦ 3.6V
GC1,GC2 Input 'H' Voltage2 VIH2 2.0 - Vcc V 3.6V ＜ Vcc ≦ 5.5V
Wake-up Time twu - 45 128 µs Shutdown → H-Gain Mode
Ev=100lx ※
Gain Ratio
H-Gain Mode / L-Gain Mode rHL - 9.5 10 times Ev=100lx
※
※ White LED is used as optical source
BH1621FVC
Technical Note
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●Reference Data
1
10
100
1000
100 1000 10000
Illuminance [ lx ]
WakeupTime [ us ]
Fig.9 IOUT VCC dependency
Fig.2 Light Source Dependency
( Fluorescent Light is set to '1' )
Fig.8 IOUT Temperature dependency
( 100 lx )
Fig.1 Spectral Response Fig.3 Illuminance - IOUT
Characteristics
Fig.4 Directional Characteristics 1 Fig.5 Directional Characteristics 2 Fig.6 Ta – IOUT ( 0 lx )
Fig.7 Ta – ICC ( 0 lx )
Fig.10 Illuminance – Wake up Time
受信指向角特性 暗電流温特
0
0.2
0.4
0.6
0.8
1
1.2
-90 -60 -30 0 30 60 90
Angle [ deg ]
Ratio
0
0.2
0.4
0.6
0.8
1
1.2
-90 -60 -30 0 30 60 90
Angle [ deg ]
Ratio
+
+
+
1pin
1pin
0.0
0.2
0.4
0.6
0.8
1.0
1.2
400 500 600 700 800 900 1000 1100
Wavelength [ nm ]
Ratio
H-Gain
SD
L-Gain
H-Gain
SD
L-Gain
H-Gain
L-Gain
00.511.52
Fluorescent
Light
Incandescent
Light
Halogen Light
Kripton Light
Artifical Sun
Light
White LED
Ratio
-
+
-
+
-
0.001
0.01
0.1
1
10
100
-40 -20 0 20 40 60 80 100
Ta [ ℃ ]
IOUT [ uA ]
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
2 2.5 3 3.5 4 4.5 5 5.5 6
VCC [ V ]
Ratio
0
0.2
0.4
0.6
0.8
1
1.2
1.4
-40 -20 0 20 40 60 80 100
Ta [ ℃ ]
Ratio
0.001
0.01
0.1
1
10
100
-40-200 20406080100
Ta [ ℃ ]
ICC [ uA ]
0.001
0.01
0.1
1
10
100
1000
10000
100000
0 1 100 10,000 1,000,000
照度 [ lx ]
IOUT [ uA ]
0.01
H-Gain
L-Gain
BH1621FVC
Technical Note
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●Block Diagram
●Block Diagram Descriptions
・PD
QPhoto 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 GC1 Mode
0 0 Shutdown
0 1 H-Gain Mode
1 0 L-Gain Mode
1 1 Shutdown
VCC
GC1
PD
IOUT
R1
Current
Amp
GND
Logic
GC2
C1
BH1621FVC
Technical Note
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●External parts Setting
1) Gain setting of BH1621FVC
Please select the best gain controlled by 3 and 4pin based on the required illuminance range.
The reference is as follows.
Illuminance detection range [lx] Gain Mode
~1000 H-Gain Mode
~50,000 L-Gain Mode
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.
Viout= 0.60 x 10-6 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.
R1 = Viout/(0.60 x 10-6 x Ev)
= 2 /(0.60 x 10-6 x 500) = 6667[Ω]
⇒6.8[kΩ]
(2) L-Gain mode
Viout= 0.063 x 10-6 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.
BH1621FVC
Technical Note
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●Terminal Descriptions
PIN No. Terminal Name Equivalent Circuit Function
1 VCC
Power Supply Terminal
2 GND
GND Terminal
3 GC1
Mode Setting Terminal 1
4 GC2
Mode Setting Terminal 2
5 IOUT
This terminal outputs current depending on
illuminance level.
Use this pin by putting resistor between
GND.
VCC
VCC
VCC
BH1621FVC
Technical Note
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●Package Outlines
●Optical design for the device
0.8 mm
0.6 mm
PD area ( 0.25 mm x 0.3 mm )
Please design an optical window to have the focused
light within this area.
Min.0.4 mm
Min.0.4 mm
Min.0.4 mm
Min.0.4 mm
WSOF5 ( Unit : mm )
Lot No.
Production
Code
A
C
BH1621FVC
Technical Note
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●Cautions on use
1) Absolute Maximum Ratings
An excess in the absolute maximum ratings, such as supply voltage ( Vmax ), temperature range of operating conditions
( Topr ), etc., can break down devices, thus making impossible to identify breaking mode such as a short circuit or an open
circuit. If any special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take
physical safety measures including the use of fuses, etc.
2) GND voltage
Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state.
Furthermore, check to be sure no terminals are at a potential lower than the GND voltage including an actual electric
transient.
3) Short circuit between terminals and erroneous mounting
In order to mount ICs on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting can
break down the ICs. Furthermore, if a short circuit occurs due to foreign matters entering between terminals or between
the terminal and the power supply or the GND terminal, the ICs can break down.
4) Operation in strong electromagnetic field
Be noted that using ICs in the strong electromagnetic field can malfunction them.
5) Inspection with set PCB
On the inspection with the set PCB, if a capacitor is connected to a low-impedance IC terminal, the IC can suffer stress.
Therefore, be sure to discharge from the set PCB by each process. Furthermore, in order to mount or dismount the set
PCB to/from the jig for the inspection process, be sure to turn OFF the power supply and then mount the set PCB to the jig.
After the completion of the inspection, be sure to turn OFF the power supply and then dismount it from the jig. In addition,
for protection against static electricity, establish a ground for the assembly process and pay thorough attention to the
transportation and the storage of the set PCB.
6) Input terminals
In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of the
parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of the
input terminal. Therefore, pay thorough attention not to handle the input terminals; such as to apply to the input terminals a
voltage lower than the GND respectively, so that any parasitic element will operate. Furthermore, do not apply a voltage to
the input terminals when no power supply voltage is applied to the IC. In addition, even if the power supply voltage is
applied, apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of
electrical characteristics.
7) Thermal design
Perform thermal design in which there are adequate margins by taking into account the permissible dissipation (pd) in
actual states of use.
8) Treatment of package
Dusts or scratch on the photo detector may affect the optical characteristics. Please handle it with care.
9) Rush current
When power is first supplied to this IC, rush current may flow instantaneously. Because it is possible that the charge
current to the parasitic capacitance of internal photo diode or the internal logic may be unstable. Therefore, give special
consideration to power coupling capacitance, power wiring, width of GND wiring, and routing of connections.
10) The exposed central pad on the back side of the package
There is an exposed central pad on the back side of the package. Please mount by footprint dimensions described in the
Jisso Information for WSOF5. This pad is GND pin, therefore there is a possibility that LSI malfunctions and heavy-current
is generated.
BH1621FVC
Technical Note
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© 2012 ROHM Co., Ltd. All rights reserved.
●Ordering part number
B H 1 6 2 1 F V C - T R
Part No. Part No.
Package
FVC: WSOF5
Packaging and forming specification
TR: Embossed tape and reel
(Unit : mm)
WSOF5
S
0.08
M
0.1 S
4
321
5
(0.05)
1.6±0.05
1.0±0.05
1.6±0.05
1.2±0.05
(MAX 1.28 include BURR)
45
321
(0.8)
(0.91)
(0.3)
(0.41)
0.2MAX
0.13±0.05
0.22±0.05
0.6MAX
0.5
0.02 +0.03
–0.02
Direction of feed
Reel
∗
Order quantity needs to be multiple of the minimum quantity.
<Tape and Reel information>
Embossed carrier tapeTape
Quantity
Direction
of feed
The direction is the 1pin of product is at the upper right when you hold
reel on the left hand and you pull out the tape on the right hand
3000pcs
TR
()
1pin
R1120
A
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The content specied herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specied in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specied herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
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Please be sure to implement in your equipment using the Products safety measures to guard
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