ROHM BH1621FVC Technical data

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

Operating Temperature Topr -40~85 ℃

7 V

No.12046EDT02

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

VCC Voltage Vcc 2.4 3.0 5.5 V

Ratings

Min. Typ. Max.

Units

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2012.02 - Rev.D

BH1621FVC

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

Parameter Symbol

Min. Typ. Max.

Limits

Units Conditions

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 )

Technical Note

Supply Current3 ( Shutdown ) Icc3sd - 0.2 0.4 µA V

IOUT Output Current1 ( Dark Current )

Iout1 - - 0.2 µA Ev=0 lx

GC1=V GC2

=0 No Input Light

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

Saturated Output Voltage V

rIF - 1.0 - times Ev=100 lx

2.6 2.9 3.0 V

OMAX

Ev=100 lx, RL=220kΩ ( H-Gain Mode )

GC1,GC2 Input 'L' Voltage VIL 0 - 0.4 V

GC1,GC2 Input 'H' Voltage1 V

GC1,GC2 Input 'H' Voltage2 V

Wake-up Time twu - 45 128 µs

Gain Ratio H-Gain Mode / L-Gain Mode

※ White LED is used as optical source

1.4 - Vcc V 2.4V ≦ Vcc ≦ 3.6V

IH1

2.0 - Vcc V 3.6V ＜ Vcc ≦ 5.5V

IH2

Shutdown → H-Gain Mode Ev=100lx

rHL - 9.5 10 times Ev=100lx

※

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BH1621FVC

Technical Note

●Reference Data

1.2

1.0

0.8

0.6

Ratio

0.4

0.2

0.0

400 500 600 700 800 900 1000 1100

Wave length [ nm ]

Fig.1 Spectral Response

1.2

0.8

受信指向角特性

0.6

Ratio

0.4

0.2

-90 -60 -30 0 30 60 90

1pin

Angle [ deg ]

Fluorescent

Light

Incandescent

Light

Halogen Light

Kripton Light

Artifical Sun

Light

White LED

00.511.52

Ratio

Fig.2 Light Source Dependency

( Fluorescent Light is set to '1' )

1.2

0.8

暗電流温特

0.6

Ratio

0.4

0.2

-90 -60 -30 0 30 60 90

Angle [ deg ]

1pin

100000

10000

1000

100

IOUT [ uA ]

0.1

0.01

0.001

0 1 100 10,000 1,000,000

H-Gain

照度

[ lx ]

Fig.3 Illuminance - IOUT

Characteristics

100

0.1

IOUT [ uA ]

0.01

0.001

-40 -20 0 20 40 60 80 100

Ta [ ℃ ]

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

L-Gain

H-Gain

L-Gain

100

0.1

ICC [ uA ]

0.01

0.001

-40-200 20406080100

Ta [ ℃ ]

Fig.7 Ta – ICC ( 0 lx )

1000

100

WakeupTime [ us ]

100 1000 10000

L-Gain

H-Gain

Illuminance [ lx ]

H-Gain L-Gain

1.4

1.2

0.8

Ratio

0.6

0.4

0.2

-40 -20 0 20 40 60 80 100

Ta [ ℃ ]

Fig.8 IOUT Temperature dependency

( 100 lx )

1.4

1.2

1.0

0.8

0.6

Ratio

0.4

0.2

0.0

2 2.5 3 3.5 4 4.5 5 5.5 6

VCC [ V ]

Fig.9 IOUT VCC dependency

Fig.10 Illuminance – Wake up Time

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3/9

2012.02 - Rev.D

BH1621FVC

●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

Current

Amp

GND

Logic

GC1

GC2

IOUT

Technical Note

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BH1621FVC

Technical Note

●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

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

= 2 /(0.60 x 10-6 x 500) = 6667[Ω]

⇒6.8[kΩ]

(2) L-Gain mode Viout= 0.063 x 10

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.

-6

x Ev x R1

-6

x Ev x R1

-6

x Ev)

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BH1621FVC

●Terminal Descriptions

PIN No. Terminal Name Equivalent Circuit Function

Technical Note

1 VCC

2 GND

3 GC1

4 GC2

Power Supply Terminal

GND Terminal

VCC

Mode Setting Terminal 1

VCC

Mode Setting Terminal 2

VCC

This terminal outputs current depending on

5 IOUT

illuminance level. Use this pin by putting resistor between GND.

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BH1621FVC

●Package Outlines

●Optical design for the device

Production Code

Min.0.4 mm

0.8 mm

Min.0.4 mm

Technical Note

Lot No.

WSOF5 ( Unit : 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.

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BH1621FVC

●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.

Technical Note

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.

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●Ordering part number

B H 1 6 2 1 F V C - T R

Part No. Part No.

WSOF5

1.6±0.05

0.6MAX

1.2±0.05

+0.03

0.02

(MAX 1.28 include BURR)

–0.02

1.6±0.05

(0.05)

0.5

1.0±0.05

321

(0.91)

0.1 S

0.22±0.05

(0.41)

(0.8)

(0.3)

0.08

0.2MAX

0.13±0.05

(Unit : mm)

Package

FVC: WSOF5

Embossed carrier tapeTape

Quantity

Direction of feed

3000pcs TR

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

Reel

Packaging and forming specification TR: Embossed tape and reel

Order quantity needs to be multiple of the minimum quantity.

∗

Technical Note

1pin

Direction of feed

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ROHM BH1621FVC Technical data

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