BH1620FVC [ROHM]

Analog Current Output Type Ambient Light Sensor IC; 模拟电流输出型环境光传感器IC


型号：	BH1620FVC
厂家：	ROHM
描述：	Analog Current Output Type Ambient Light Sensor IC 模拟电流输出型环境光传感器IC 模拟IC 传感器信号电路光电二极管
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Ambient Light Sensor IC Series

Analog Current Output Type

Ambient Light Sensor IC

BH1620FVC

No.09046EBT03

●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, Car navigation,

PDA, LCD display

●Absolute Maximum Ratings

Parameter

Supply Voltage

Symbol

Vmax

Topr

Limits

Units

Operating Temperature

Storage Temperature

Iout Current

-40~85

-40~100

7.5

℃

Tstg

℃

Ioutmax

165^※

Power Dissipation

※ 70mm × 70mm × 1.6mm glass epoxy board. Derating at 2.2 mW/℃ for operating above Ta=25℃.

●Operating Conditions

Parameter

VCC Voltage

Symbol

Vcc

Min.

2.4

Typ.

3.0

Max.

5.5

Units

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2009.04 - Rev.B

1/9

BH1620FVC

Technical Note

●Electrical Characteristics ( VCC = 3.0V, Ta = 25℃, unless otherwise noted )

Parameter

Symbol

Min.

Typ.

Max.

Units

µA

Conditions

Supply Current1 ( Operate )

Ev=100 lx (H-Gain Mode)^※

Icc1

48.5

Icc2

Icc3sd

Iout1

Iout2

λp

4.5

0.2

13.5

0.4

0.2

65.5

µA

Supply Current2 ( 0 lx )

Ev=0 lx (H-Gain Mode)

V_GC1=V _GC2=0 No Input Light

Ev=0 lx

Supply Current3 ( Shutdown )

IOUT Output Current1(Dark Current)

IOUT Output Current2

48.5

Ev=100 lx (H-Gain Mode)^※

560

Peak Wave Length

Incandescent/Fluorescent

Light Current Ratio

rIF

1.0

times

Ev=100 lx

Ev=100 lx, RL=220kΩ

V_OMAX

V_IL

2.6

2.9

3.0

0.4

Saturated Output Voltage

GC1,GC2 Input ‘L’ Voltage

GC1,GC2 Input ‘H’ Voltage1

GC1,GC2 Input ‘H’ Voltage2

(H-Gain Mode)^※

V_IH1

V_IH2

1.4

2.0

Vcc

2.4V ≦ VCC ≦ 3.6V

3.6V ＜ VCC ≦ 5.5V

Shutdown → H-Gain Mode

Ev=100lx^※

Wake-up Time

twu

128

µs

Gain Ratio

H-Gain Mode/M-Gain Mode

Gain Ratio

Ev=100lx^※

rHM

rML

9.5

10.5

times

M-Gain Mode/L-Gain Mode

※ White LED is used as optical source

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2009.04 - Rev.B

2/9

BH1620FVC

Technical Note

●Reference Data

H-Gain

100000

10000

1000

100

1.2

1.0

0.8

0.6

0.4

0.2

0.0

Fluorescent

Light

M-Gain

L-Gain

Incandescent

Light

Halogen Light

Kripton Light

Artifical Sun

Light

0.1

0.01

0.001

White LED

400

500

600

700

800

900

1000 1100

0.01

100

10,000

1,000,000

0.5

1.5

Wavelength [ nm ]

Illuminance [ lx ]

Ratio

Fig.3 Illuminance – IOUT

Characteristics

Fig.1 Spectral Response

Fig.2 Light Source Dependency

( Fluorescent Light is set to '1' )

1.2

100

1pin

0.8

0.6

0.4

0.2

0.8

暗電流温特

H-Gain

受信指向角特性

0.6

1pin

M-Gain

L-Gain

0.1

0.4

0.01

0.001

0.2

-40 -20

20 40 60 80 100

Ta [ ℃ ]

-90

-60

-30

-90

-60

-30

Angle [ deg ]

Fig.4 Directional Characteristics 1

Fig.5 Directional Characteristics 2

Fig.6 Ta – IOUT ( 0 lx )

1.4

1.2

1.4

1.2

100

H-Gain

M-Gain

L-Gain

0.8

0.6

0.4

0.2

0.8

0.6

0.4

0.2

0.1

0.01

0.001

2.5

3.5

4.5

5.5

-40

-20

100

-40

-20

100

VCC [ V ]

Ta [ ℃ ]

Ta [ ℃]

Fig.7 Ta – ICC ( 0 lx )

Fig.8 IOUT Temperature dependency

( 100 lx )

Fig.9 IOUT VCC dependency

10000

1000

100

L-Gain

M-Gain

H-Gain

100

1000

Illuminance [ lx ]

10000

Fig.10 Illuminance – Wake up Time

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2009.04 - Rev.B

3/9

BH1620FVC

Technical Note

●Block Diagram

VCC

GC1

GC2

Logic

Current

Amp

IOUT

GND

●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

Shutdown

H-Gain Mode

M-Gain Mode

L-Gain Mode

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2009.04 - Rev.B

4/9

BH1620FVC

Technical Note

●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

H-Gain Mode

M-Gain Mode

L-Gain Mode

~1,000

~10,000

~100,000

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 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= 0.57 x 10^-6x 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/(0.57 x 10^-6x Ev)

= 2 /(0.57 x 10^-6x 500) = 7018[Ω]

⇒6.8[kΩ]

(2) M-Gain mode

Viout= 0.057 x 10^-6x Ev x R1

(3) L-Gain mode

Viout= 0.0057 x 10^-6x 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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2009.04 - Rev.B

5/9

BH1620FVC

Technical Note

●Terminal Descriptions

PIN No.

Terminal Name

Equivalent Circuit

Function

VCC

GND

Power Supply Terminal

GND Terminal

VCC

GC1

GC2

IOUT

Mode Setting Terminal 1

VCC

Mode Setting Terminal 2

VCC

This terminal outputs current depending on

illuminance level.

Use this pin by putting resistor between GND.

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2009.04 - Rev.B

6/9

BH1620FVC

Technical Note

●Package Outlines

Production code

Lot No.

WSOF5 ( Unit : mm )

●Optical design for the device

0.8 mm

0.6 mm

Min.0.4 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

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2009.04 - Rev.B

7/9

BH1620FVC

Technical Note

●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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2009.04 - Rev.B

8/9

BH1620FVC

Technical Note

●Ordering part number

T R

Part No.

Package

Packaging and forming specification

TR: Embossed tape and reel

FVC: WSOF5

WSOF5

1.6 0.05

1.0 0.05

(0.8)

(0.3)

Tape

Embossed carrier tape

3000pcs

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

(

)

2 1

1pin

0.13 0.05

0.1

0.22 0.05

0.5

0.08

Direction of feed

Order quantity needs to be multiple of the minimum quantity.

Reel

(Unit : mm)

∗

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2009.04 - Rev.B

9/9

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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 speciﬁed in this document.

However, should you incur any damage arising from any inaccuracy or misprint of such

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R0039

BH1620FVC [ROHM]

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