Ambient Light Sensor IC Series Analog Current Output Type Ambient Light Sensor IC BH1621FVC No.09046EBT02 ●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, Car navigation, PDA, LCD display ●Absolute Maximum Ratings Parameter Supply Voltage Symbol Limits Units Vmax 7 V Topr -40~85 ℃ Operating Temperature Storage Temperature Iout Current Tstg -40~100 ℃ Ioutmax 7.5 mA Pd 165※ mW Power Dissipation ※ 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 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1/9 2009.04 - Rev.B BH1621FVC Technical Note ●Electrical Characteristics ( VCC = 3.0V, Ta = 25℃, unless otherwise noted ) Parameter Symbol Min. Typ. Max. Units 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 ) Icc3sd - 0.2 0.4 µA VGC1=V GC2=0 No Input Light Iout1 - - 0.2 µA Ev=0 lx Iout2 51 60 69 µA Ev=100 lx ( H-Gain Mode ) λp - 560 - nm rIF - 1.0 - times Saturated Output Voltage VOMAX 2.6 2.9 3.0 V 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 Gain Ratio H-Gain Mode / L-Gain Mode rHL - 9.5 10 times Supply Current3 ( Shutdown ) IOUT Output Current1 ( Dark Current ) IOUT Output Current2 Peak Wave Length Incandescent/Fluorescent Light Current Ratio Conditions ※ ※ Ev=100 lx Ev=100 lx, RL=220kΩ ( H-Gain Mode ) ※ Shutdown → H-Gain Mode Ev=100lx ※ Ev=100lx ※ ※ White LED is used as optical source www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 2/9 2009.04- Rev.B BH1621FVC Technical Note ●Reference Data 1.2 1.0 1000 IOUT [ uA ] Ratio 10000 Incandescent Light 0.8 Halogen Light 0.6 Kripton Light 0.4 Artifical Sun Light 0.2 H-Gain 100000 Fluorescent Light L-Gain 100 10 1 0.1 0.01 White LED 0.0 400 500 600 700 800 900 1000 0 Wavelength [ nm ] 0.5 1.2 1.5 Ratio 0.010 2 Ratio 0.6 1pin - 0.4 1,000,000 10 暗電流温特 0.8 - 0.6 10,000 100 IOUT [ uA ] 0.8 100 Fig.3 Illuminance - IOUT Characteristics 1 1pin + 受信指向角特性 1 Illuminance [ lx ] 1.2 1 H-Gain 1 L-Gain 0.1 0.4 0.01 + 0.2 0.2 + + -90 -60 -30 0 30 60 -90 90 -60 -30 Angle [ deg ] 0 30 60 -40 90 H-Gain L-Gain 10 1.4 1.4 1.2 1.2 1 1.0 0.8 0.8 Ratio Ratio SD 0.1 0.6 20 40 60 80 100 Ta [ ℃ ] 80 100 0.6 0.0 0 -40 -20 0 20 40 60 80 100 Ta [ ℃ ] Fig.8 IOUT Temperature dependency ( 100 lx ) Fig.7 Ta – ICC ( 0 lx ) 60 0.2 0.2 0.001 40 0.4 0.4 0.01 20 Fig.6 Ta – IOUT ( 0 lx ) 1 0 0 Ta [ ℃ ] Fig.5 Directional Characteristics 2 100 -20 -20 Angle [ deg ] Fig.4 Directional Characteristics 1 -40 SD 0.001 + 0 0 ICC [ uA ] 1 Fig.2 Light Source Dependency ( Fluorescent Light is set to '1' ) Fig.1 Spectral Response Ratio 0.001 1100 2 2.5 3 3.5 4 4.5 VCC [ V ] 5 5.5 6 Fig.9 IOUT VCC dependency WakeupTime [ us ] 1000 100 10 L-Gain H-Gain 1 100 1000 Illuminance [ lx ] 10000 Fig.10 Illuminance – Wake up Time www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 3/9 2009.04- Rev.B BH1621FVC Technical Note ●Block Diagram VCC GC1 Logic GC2 PD Current Amp IOUT R1 C1 GND ●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 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 4/9 2009.04- Rev.B 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. -6 Viout= 0.60 x 10 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. -6 R1 = Viout/(0.60 x 10 x Ev) -6 = 2 /(0.60 x 10 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. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 5/9 2009.04- Rev.B BH1621FVC Technical Note ●Terminal Descriptions PIN No. Terminal Name Equivalent Circuit Function 1 VCC Power Supply Terminal 2 GND GND Terminal VCC 3 GC1 Mode Setting Terminal 1 VCC 4 GC2 Mode Setting Terminal 2 VCC 5 This terminal outputs current depending on illuminance level. Use this pin by putting resistor between GND. IOUT www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 6/9 2009.04- Rev.B BH1621FVC Technical Note ●Package Outlines A C Production Code Lot No. WSOF5 ( Unit : mm ) ●Optical design for the device 0.8 mm 0.6 mm Min.0.4 mm Min.0.4 mm PD area ( 0.25 mm x 0.3 mm ) Min.0.4 mm www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Please design an optical window to have the focused light within this area. Min.0.4 mm 7/9 2009.04- Rev.B BH1621FVC 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. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 8/9 2009.04- Rev.B BH1621FVC Technical Note ●Ordering part number B H 1 Part No. 6 2 1 F Part No. V C - Package FVC: WSOF5 T R Packaging and forming specification TR: Embossed tape and reel WSOF5 1.0±0.05 3000pcs 4 4 (0.91) 5 0.2MAX Embossed carrier tape Quantity (0.05) Tape (0.3) 5 (0.41) 1.6±0.05 (0.8) Direction of feed 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 ) 3 2 1 1 2 3 1pin 0.13±0.05 S +0.03 0.02 –0.02 0.6MAX 1.2±0.05 (MAX 1.28 include BURR) <Tape and Reel information> 1.6±0.05 0.1 S 0.5 0.22±0.05 0.08 Direction of feed M Reel (Unit : mm) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 9/9 ∗ Order quantity needs to be multiple of the minimum quantity. 2009.04- Rev.B Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified 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 specifications, 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. 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