BH1680FVC-tr - ROHM Semiconductor

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www.rohm.com 2012.02 - Rev.B

Ambient Light Sensor ICs

Analog Current Output Type

Ambient Light Sensor IC

BH1680FVC

●Descriptions

BH1680FVC is an analog current output ambient light sensor. This IC can detect the illuminance from 0lx to 50000lx. It 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. It is suitable also for the use of optical window that the visible light transmission is low because of the high

sensitivity type.

●Features

1) Compact surface mount package 1.6 x 1.6 mm

2) Output current in proportion to brightness

3) Suitable for optical window that the visible light transmission is low (High sensitivity type)

4) The influence of infrared is very small by an infrared cut filter

5) Supply voltage operates from 2.4V to 5.5V

6) Built-in shutdown function

7) 3 steps controllable output current gain

8) 1.8V logic input interface

9) Low sensitivity variation (+/-15%)

●Applications

Mobile phone, LCD TV, PDP TV, Laptop PC, Portable game console, Digital camera, Digital video camera, 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

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

Parameter Symbol Min. Typ. Max. Units Conditions

Supply Current1 ( Operate ) Icc1 51.9 75 105 µA Ev=10 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 51.9 61 70.1 µA Ev=10 lx (H-Gain Mode)※

Peak Wave Length λp - 530 - nm

Saturated Output Voltage VOMAX 2.6 2.9 3.0 V

Ev=10 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 - 13 52 µs Shutdown → H-Gain Mode

Ev=100lx※

Gain Ratio

H-Gain Mode/M-Gain Mode rHM 8 10 12 times Ev=10lx※

Gain Ratio

M-Gain Mode/L-Gain Mode rML 8 10 12 times Ev=10lx※

※ White LED is used as optical source

No.12046EBT14

BH1680FVC

Technical Note

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www.rohm.com 2012.02 - Rev.B

●Reference Data

0.001

0.01

0.1

100

1000

10000

0 10 1,000 100,000

Illuminance[lx]

IOUT [uA]

0.1

H-Gain M-Gain

L-Gain

0.2

0.4

0.6

0.8

1.2

1.4

-40 -20 0 20 40 60 80 100

Ta [℃]

Ratio

100

1000

10 100 1000

Illuminance[lx]

Wake up Time [us]

0.001

0.01

0.1

-40-200 20406080100

Ta [℃]

IOUT [uA]

0.0

0.2

0.4

0.6

0.8

1.0

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

100

-40 -20 0 20 40 60 80 100

Ta [℃]

ICC [uA]

Fig.8 IOUT Temperature dependency

( 10 lx )

Fig.1 Spectral Response

Fig.4 Directional Characteristics 1 Fig.5 Directional Characteristics 2 Fig.6 Ta – IOUT ( 0 lx )

Fig.7 Ta – ICC ( 0 lx ) Fig.9 IOUT VCC dependency

Fig.10 Illuminance – Wake up Time

H-Gain

M-Gain

1pin

L-Gain

H-Gain

M-Gain

L-Gain

0.2

0.4

0.6

0.8

1.2

1.4

2 2.5 3 3.5 4 4.5 5 5.5 6

VCC [V]

Ratio

Fig.3 Illuminance – IOUT

Characteristics

0.0

0.2

0.4

0.6

0.8

1.0

1.2

-90 -60 -30 0 30 60 90

Angle [deg]

Ratio

1pin

Fig.2 Light Source Dependency

( Fluorescent Light is set to '1' )

H-Gain

M-Gain

L-Gain

00.511.52

White LED

Artifical Sun

Light

Kripton Light

Halogen Light

Incandescent

Light

Fluorescent

Light

Ratio

－

BH1680FVC

Technical Note

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www.rohm.com 2012.02 - Rev.B

●Block Diagram

●Block Diagram Descriptions

・PD

Photo diode detects the visible light, and cuts the infrared.

・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

IOUT

Current

Amp

GND

Logic

GC2

BH1680FVC

Technical Note

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www.rohm.com 2012.02 - Rev.B

●External parts Setting

1) Gain setting of BH1680FVC

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

~100 H-Gain Mode

~1,000 M-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. 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= 6.1 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 50 lx by ADC.

If the maximum voltage of ADC input is 2V, output resistor value will be as below.

R1 = Viout/(6.1 x 10-6 x Ev)

= 2 /(6.1 x 10-6 x 50) = 6557[Ω]

⇒6.8[kΩ]

(2) M-Gain mode

Viout= 0.61 x 10-6 x Ev x R1

(3) L-Gain mode

Viout= 0.061 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.

(For example) If the R1 = 6.8[kΩ], C1 value will be as below.

C1 = 0.1 / R1

= 0.1 / ( 6.8 x 103 ) = 14.7 x 10-6[F]

⇒15[uF]

(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.

BH1680FVC

Technical Note

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www.rohm.com 2012.02 - Rev.B

●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

BH1680FVC

Technical Note

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www.rohm.com 2012.02 - Rev.B

●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

WSOF5 ( Unit : mm )

Lot No.

Production code

BH1680FVC

Technical Note

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www.rohm.com 2012.02 - Rev.B

●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.

BH1680FVC

Technical Note

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www.rohm.com 2012.02 - Rev.B

●Ordering part number

B H 1 6 8 0 F V C - T R

Part No. Part No.

Package

FVC: WSOF5

Packaging and forming specification

TR: Embossed tape and reel

(Unit : mm)

WSOF5

0.08

0.1 S

321

(0.05)

1.6±0.05

1.0±0.05

1.6±0.05

1.2±0.05

(MAX 1.28 include BURR)

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.

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

()

1pin

Datasheet

Notice - GE Rev.002

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Notice - GE Rev.002

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