BH1621FVC

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 Operating Temperature Storage Temperature Iout Current Power Dissipation Symbol Vmax Topr Tstg Ioutmax Pd Limits 7 -40~85 -40~100 7.5 165※ Units V ℃ ℃ mA mW ※ 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 V www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1/9 2009.04 - Rev.B BH1621FVC ●Electrical Characteristics ( VCC = 3.0V, Ta = 25℃, unless otherwise noted ) Parameter Supply Current1 ( Operate ) Supply Current2 ( 0 lx ) Supply Current3 ( Shutdown ) IOUT Output Current1 ( Dark Current ) IOUT Output Current2 Peak Wave Length Incandescent/Fluorescent Light Current Ratio Saturated Output Voltage GC1,GC2 Input 'L' Voltage GC1,GC2 Input 'H' Voltage1 GC1,GC2 Input 'H' Voltage2 Wake-up Time Gain Ratio H-Gain Mode / L-Gain Mode ※ White LED is used as optical source Technical Note Symbol Icc1 Icc2 Icc3sd Iout1 Iout2 λp rIF VOMAX VIL VIH1 VIH2 twu rHL Min. 51 4.5 51 2.6 0 1.4 2.0 - Typ. 74 9 0.2 60 560 1.0 2.9 45 9.5 Max. 97 13.5 0.4 0.2 69 3.0 0.4 Vcc Vcc 128 10 Units µA µA µA µA µA nm times V V V V µs times Ev=100 lx Conditions Ev=100 lx ( H-Gain Mode ) Ev=0 lx ( H-Gain Mode ) VGC1=V GC2=0 No Input Light Ev=0 lx Ev=100 lx ( H-Gain Mode ) ※ ※ Ev=100 lx, RL=220kΩ ( H-Gain Mode ) ※ 2.4V ≦ Vcc ≦ 3.6V 3.6V ＜ Vcc ≦ 5.5V Shutdown → H-Gain Mode Ev=100lx Ev=100lx ※ ※ www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 2/9 2009.04- Rev.B BH1621FVC ●Reference Data 1.2 1.0 0.8 Technical Note Fluorescent Light Incandescent Light 100000 10000 1000 H-Gain L-Gain IOUT [ uA ] Ratio Halogen Light 0.6 0.4 0.2 0.0 400 500 600 700 800 900 1000 1100 100 10 1 0.1 0.01 Kripton Light Artifical Sun Light White LED 0.001 0 0.5 Wavelength [ nm ] Ratio 1 1.5 2 0.01 0 1 100 10,000 1,000,000 Illuminance [ lx ] Fig.1 Spectral Response Fig.2 Light Source Dependency ( Fluorescent Light is set to '1' ) 1.2 1 Fig.3 Illuminance - IOUT Characteristics 100 10 IOUT [ uA ] 1.2 1 0.8 1pin + 受信指向角特性 Ratio 0.8 0.6 0.4 暗電流温特 1pin Ratio 0.6 0.4 0.2 0 -90 -60 - 1 0.1 0.01 H-Gain L-Gain - + 0.2 0 + + + 0.001 60 90 SD -40 -20 0 20 40 60 80 100 Ta [ ℃ ] -30 0 30 60 90 -90 -60 -30 0 30 Angle [ deg ] Angle [ deg ] Fig.4 Directional Characteristics 1 Fig.5 Directional Characteristics 2 Fig.6 Ta – IOUT ( 0 lx ) 100 1.4 1.4 1.2 1.0 10 H-Gain L-Gain Ratio 1.2 1 ICC [ uA ] 1 0.1 SD Ratio 0.8 0.6 0.4 0.2 0.8 0.6 0.4 0.2 0.0 0.01 0.001 -40 -20 0 20 40 60 80 100 0 -40 -20 0 20 40 60 80 100 Ta [ ℃ ] 2 2.5 3 Ta [ ℃ ] 3.5 4 4.5 VCC [ V ] 5 5.5 6 Fig.7 Ta – ICC ( 0 lx ) Fig.8 IOUT Temperature dependency ( 100 lx ) Fig.9 IOUT VCC dependency 1000 WakeupTime [ us ] 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 ●Block Diagram Technical Note VCC GC1 GC2 Logic 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 0 0 1 1 GC1 0 1 0 1 Mode Shutdown H-Gain Mode L-Gain Mode Shutdown www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 4/9 2009.04- Rev.B BH1621FVC ●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] ~1000 ~50,000 Gain Mode H-Gain Mode L-Gain Mode Technical Note 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 ●Terminal Descriptions PIN No. Terminal Name Equivalent Circuit Technical Note 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 IOUT This terminal outputs current depending on illuminance level. Use this pin by putting resistor between GND. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 6/9 2009.04- Rev.B BH1621FVC ●Package Outlines Technical Note 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 ) Please design an optical window to have the focused light within this area. Min.0.4 mm Min.0.4 mm www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 7/9 2009.04- Rev.B BH1621FVC ●Cautions on use Technical Note 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 ●Ordering part number Technical Note B H 1 Part No. 6 2 1 F V C - T R Part No. Package FVC: WSOF5 Packaging and forming specification TR: Embossed tape and reel WSOF5 1.6±0.05 1.0±0.05 5 4 (0.8) 0.2MAX Tape Quantity Direction of feed Embossed carrier tape 3000pcs TR The direction is the 1pin of product is at the upper right when you hold 1.2±0.05 (MAX 1.28 include BURR) (0.3) (0.05) 1.6±0.05 4 5 (0.91) (0.41) ( reel on the left hand and you pull out the tape on the right hand 1pin ) 123 321 0.13±0.05 S 0.6MAX +0.03 0.02 –0.02 0.1 0.5 0.22±0.05 S 0.08 M Direction of feed (Unit : mm) Reel ∗ Order quantity needs to be multiple of the minimum quantity. www.rohm.com © 2009 ROHM Co., Ltd. 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