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PDF BH1620FVC Data sheet ( Hoja de datos )
| Número de pieza | BH1620FVC | |
| Descripción | Analog Current Output Type Ambient Light Sensor IC | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Ambient Light Sensor ICs
Analog Current Output Type
Ambient Light Sensor IC
BH1620FVC
No.12046EDT03
●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, PDA,
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
VCC Voltage
Symbol Min. Typ. Max. Units
Vcc 2.4 3.0 5.5 V
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
1/9
2012.02 - Rev.D
1 page  
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]
~1,000
~10,000
~100,000
Gain Mode
H-Gain Mode
M-Gain Mode
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= 0.57 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 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 10-6 x Ev)
= 2 /(0.57 x 10-6 x 500) = 7018[Ω]
⇒6.8[kΩ]
(2) M-Gain mode
Viout= 0.057 x 10-6 x Ev x R1
(3) L-Gain mode
Viout= 0.0057 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
© 2012 ROHM Co., Ltd. All rights reserved.
5/9
2012.02 - Rev.D
5 Page 
Datasheet
General Precaution
1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.
ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny
ROHM’s Products against warning, caution or note contained in this document.
2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior
notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s
representative.
3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all
information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or
liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or
concerning such information.
Notice – WE
© 2014 ROHM Co., Ltd. All rights reserved.
Rev.001
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet BH1620FVC.PDF ] | |
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