BH1620FVC Datasheet by Rohm Semiconductor

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Technical Note ' I f F1122 Rigs w mm ...........................
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Ambient Light Sensor ICs
Analog Current Output Type
Ambient Light Sensor IC
BH1620FVC
Descriptions
BH1620FVC 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) 3 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 Limits 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 Min. Typ. Max. Units
VCC Voltage Vcc 2.4 3.0 5.5 V
No.12046EDT03
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Electrical Characteristics ( VCC = 3.0V, Ta = 25, unless otherwise noted )
Parameter Symbol Min. Typ. Max. Units Conditions
Supply Current1 ( Operate ) Icc1 48.5 71 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 48.5 57 65.5 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/M-Gain Mode rHM 9.5 10 10.5 times Ev=100lx
Gain Ratio
M-Gain Mode/L-Gain Mode rML 9.5 10 10.5 times Ev=100lx
White LED is used as optical source
l I mo ‘ A m 09 K g I 5 as t 3 m M _ «E 3ij 2 am V 02 ‘ 0 00m -' Jansnannznsnm msuauuausu-m 40'2002040 Ang‘eweg] “was“ h[‘c] Fig.4 Diremional Charaderisfics 1 Fig.5 Direchonal Characterishcs Z Figfi Ta , IOUT( 0 me u +Gain ‘2 “2/ .Gain L-Gain ‘ g ‘ Q a as Em__....—--3D Q in m um u; nnm “ ‘0 '2“ n am“; an an mo 40 2n n as] an an mm 2 15 3 JSCC‘IV‘S Fng Ta , lcc ( 0 \x) Fxg.8 IOUT Temperalure dependency Figs \ouT vcc dep (10cm) 1uuou E1000 3 L-Gain ; 100 % M-Ga 3 ‘V 1n 3 H-Gain 1 mo won mono mummance [ Ix] Fig.10 ”luminance , Wake up Time www.mhm.oom 3/9 201 © 2012 ROHM Ca.‘ le. Au nghls reserved.
BH1620FVC
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Reference Data
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
0.2
0.4
0.6
0.8
1.0
1.2
400 500 600 700 800 900 1000 1100
Wavelength [ nm ]
Ratio
0.001
0.01
0.1
1
10
100
-40 -20 0 20 40 60 80 100
Ta [ ℃ ]
IOUT [ uA ]
L-Gain
H-Gain
SD
M-Gain
0.001
0.01
0.1
1
10
100
-40-20 0 20406080100
Ta [ ]
ICC [ uA ]
H-Gain
M-Gain
SD
L-Gain
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
0.2
0.4
0.6
0.8
1
1.2
1.4
2 2.5 3 3.5 4 4.5 5 5.5 6
VCC [ V ]
Ratio
H-Gain
L-Gain
M-Gain
1
10
100
1000
10000
100 1000 10000
Illuminance [ lx ]
WakeupTime [ us ]
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
1000
10000
100000
0 1 100 10,000 1,000,000
IOUT [ uA ]
H-Gain
M-Gain
L-Gain
0.01
Illuminance
[
lx
]
- +
1pin
+
-
0
0.2
0.4
0.6
0.8
1
1.2
-90 -60 -30 0 30 60 90
Ang le [ deg ]
Ratio
+
1pin
+
--
PD Curreni Amp _____D.____ GND .Block Diagram Descriptions -PD Phoio diode close 1o human eyes sensiiiviiy - Current AMP To amplify Phoio diode currenH H»Gain / M-Gain / L-Gam ) Gain comrollable in 3 sieps by inpuivoliage from Gm and 662. - Logic Logic block for mode semng by inpui voliage from 601 and GCZ .Mode Setting GCZ GC1 Mode 0 0 Shuidown 0 1 H»Gain Mode 1 0 M-Gain Mode 1 1 L-Gam Mode www.mhm.com © 2012 ROHM Co.‘ Lid. Au nghls reserved. 4/9
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Block Diagram
Block Diagram Descriptions
PD
Photo diode close to human eyes sensitivity.
Current AMP
To amplify Photo diode current ( H-Gain / M-Gain / L-Gain )
Gain controllable in 3 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 M-Gain Mode
1 1 L-Gain Mode
VCC
GC1
PD
IOUT
R1
Current
Amp
GND
Logic
GC2
C1
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External parts Setting
1) Gain setting of BH1620FVC
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
~1,000 H-Gain Mode
~10,000 M-Gain Mode
~100,000 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. Please set output resistance value( R1) within the range of 1 k~1M
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= 0.57 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[].
(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/(0.57 x 10-6 x Ev)
= 2 /(0.57 x 10-6 x 500) = 7018[]
6.8[k]
(2) M-Gain mode
Viout= 0.057 x 10-6 x Ev x R1
(3) L-Gain mode
Viout= 0.0057 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.
TEE“???
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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
' ‘ ‘ (a a: ,'.0=G‘05 ;\ } :5 a; ‘ :I -3 a; N ‘ ’5' ._. | 1 1— ° .5, M - fl - as: . /-D m mm? : ~'~5 D/fl ‘ ‘m ' LI L1 u S v 2 3 O.IJ:CJ 95 .Optical design for the device www.mhm.oom © 2012 ROHM Ca.. le. AH rights reserved.
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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
A
BH1620FVC
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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 parastic 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.
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7. De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual
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8. Confirm that operation temperature is within the specified range described in the product specification.
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Precaution for Mounting / Circuit board design
1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product
performance and reliability.
2. In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the
ROHM representative in advance.
For details, please refer to ROHM Mounting specification
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[b] the temperature or humidity exceeds those recommended by ROHM
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