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2009.04- Rev.B

Ambient Light Sensor IC Series

Digital 16bit Serial Output Type

Ambient Light Sensor IC

BH1750FVI

●Descriptions

BH1750FVI is an digital Ambient Light Sensor IC for I

C bus interface. This IC is the most suitable to obtain the ambient light

data for adjusting LCD and Keypad backlight power of Mobile phone. It is possible to detect wide range at High resolution.

( 1 - 65535 lx ).

●Features

1) I

C bus Interface ( f / s Mode Support )

2) Spectral responsibility is approximately human eye response

3) Illuminance to Digital Converter

4) Wide range and High resolution. ( 1 - 65535 lx )

5) Low Current by power down function

6) 50Hz / 60Hz Light noise reject-function

7) 1.8V Logic input interface

8) No need any external parts

9) Light source dependency is little. ( ex. Incandescent Lamp. Fluorescent Lamp. Halogen Lamp. White LED. Sun Light )

10) It is possible to select 2 type of I

C slave-address.

11) Adjustable measurement result for influence of optical window

( It is possible to detect min. 0.11 lx, max. 100000 lx by using this function. )

12) Small measurement variation (+/- 20%)

13) The influence of infrared is very small.

●Applications

Mobile phone, LCD TV, NOTE PC, Portable game machine, Digital camera, Digital video camera, Car navigation, PDA,

LCD display

●Absolute Maximum Ratings

Parameter Symbol Limits Units

Supply Voltage Vmax

4.5 V

Operating Temperature Topr -40～85 ℃

Storage Temperature Tstg -40～100 ℃

SDA Sink Current Imax 7 mA

Power Dissipation Pd 260

※

※ 70mm × 70mm × 1.6mm glass epoxy board. Derating in done at 3.47mW/℃ for operating above Ta=25℃.

●Operating Conditions

Parameter Symbol Min. Typ. Max. Units

VCC Voltage Vcc 2.4 3.0 3.6 V

C Reference Voltage VDVI 1.65 - VCC V

No.09046EBT01

Summary of content (18 pages)

PAGE 1
Ambient Light Sensor IC Series Digital 16bit Serial Output Type Ambient Light Sensor IC BH1750FVI No.09046EBT01 ●Descriptions 2 BH1750FVI is an digital Ambient Light Sensor IC for I C bus interface. This IC is the most suitable to obtain the ambient light data for adjusting LCD and Keypad backlight power of Mobile phone. It is possible to detect wide range at High resolution. ( 1 - 65535 lx ).
PAGE 2
BH1750FVI Technical Note ●Electrical Characteristics ( VCC = 3.0V, DVI = 3.0V, Ta = 25℃, unless otherwise noted ) Parameter Symbol Min. Typ. Max. Units Conditions Supply Current Icc1 － 120 190 µA Ev = 100 lx Powerdown Current Icc2 － 0.01 1.0 µA No input Light Peak Wave Length λp － 560 － nm Measurement Accuracy S/A 0.96 1.2 1.
PAGE 3
BH1750FVI Technical Note ●Reference Data 64 1.2 100000 56 Ratio 0.8 0.6 0.4 10000 48 Measurement Result Measurement Result 1 40 32 H-Res. H-Res. L-Res. 24 16 100 10 L-Res. 8 0.2 1000 1 0 0 400 500 600 700 800 900 1000 0 1100 8 16 24 32 40 48 56 1 64 Wavelength [ nm ] 1.2 1.2 1 Measurement Result 0.8 + Ratio Ratio - 0.6 0.6 - 1pin 0.4 - 0.4 - + 0.2 -30 0 30 60 -60 -30 90 30 60 0 90 -40 ICC @ Measurement Halogen Light 0.
PAGE 4
BH1750FVI Technical Note ●Block Diagram DVI VCC AMP Logic + I C Interface ADC 2 SCL SDA PD OSC GND ADDR ●Block Diagram Descriptions ・PD Photo diode with approximately human eye response. ・AMP Integration-OPAMP for converting from PD current to Voltage. ・ADC AD converter for obtainment Digital 16bit data. 2 ・Logic + I C Interface Ambient Light Calculation and I2C BUS Interface. It is including below register. Data Register → This is for registration of Ambient Light Data.
PAGE 5
BH1750FVI Technical Note ●Instruction Set Architecture Instruction Opecode Comments Power Down 0000_0000 No active state. Power On 0000_0001 Waiting for measurement command.
PAGE 6
BH1750FVI Technical Note ●Timing chart for VCC and DVI power supply sequence DVI is I2C bus reference voltage terminal. And it is also asynchronous reset terminal. It is necessary to set to 'L' supplied. In DVI 'L' term, internal state is set to Power Down mode. after VCC is 1) Recommended Timing chart1 for VCC and DVI supply. VCC DVI Reset Term ( more than 1us ) 2) Timing chart2 for VCC and DVI supply.
PAGE 7
BH1750FVI Technical Note ●Measurement sequence example from "Write instruction" to "Read measurement result" ex1) Continuously H-resolution mode ( ADDR = 'L' ) from Slave to Master from Master to Slave ① Send "Continuously H-resolution mode " instruction ST 0100011 0 Ack 00010000 Ack SP ② Wait to complete 1st H-resolution mode measurement.( max. 180ms. ) ③ Read measurement result.
PAGE 8
BH1750FVI Technical Note ●Application circuit example of DVI terminal The DVI terminal is an asynchronous reset terminal. Please note that there is a possibility that IC doesn't operate normally if the reset section is not installed after the start-up of VCC. (Please refer to the paragraph of "Timing chart for VCC and DVI power supply sequence" ) The description concerning SDA and the terminal SCL is omitted in this application circuit example.
PAGE 9
BH1750FVI Technical Note ex 4) LPF using CR is inserted between VCC and DVI. This method has the possibility that the Reset section of turning on the power supply can not satisfied. cannot be satisfied. Please design the set considering the characteristic of the power supply enough. R1 : 1kOhm BH1750FVI 0.
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BH1750FVI Technical Note ●I2C Bus Access 1 ) I2C Bus Interface Timing chart 2 Write measurement command and Read measurement result are done by I C Bus interface. Please refer the formally 2 specification of I C Bus interface, and follow the formally timing chart. SDA tSU ; DAT tr tf tf tHD ; STA tHD tLOW tr tBUF SCL tSU ; STA tHD ; STA S tSU;STO tHD ; DAT P Sr tHIGH t S S S 2) Slave Address Slave Address is 2 types, it is determined by ADDR Terminal ADDR = ‘H’ ( ADDR ≧ 0.
PAGE 11
BH1750FVI Technical Note ●Adjust measurement result for influence of optical window. ( sensor sensitivity adjusting ) BH1750FVI is possible to change sensor sensitivity. And it is possible to cancel the optical window influence ( difference with / without optical window ) by using this function. Adjust is done by changing measurement time. For example, when transmission rate of optical window is 50% ( measurement result becomes 0.
PAGE 12
BH1750FVI Technical Note ●H-Resolution Mode2 H-resolution mode2 is 0.5lx ( typ. ) resolution mode. It is suitable if under less than 10 lx measure ment data is necessary. This measurement mode supports " Adjust measurement result for influence of optical window ". Please refer it. It is possible to detect min. 0.11 lx by using H-resolution mode2.
PAGE 13
BH1750FVI Technical Note ●Terminal Description PIN No. Terminal Name 1 Equivalent Circuit VCC Function Power Supply Terminal 2 VCC I C Slave-address Terminal ADDR = ‘H’ ( ADDR ≧ 0.7VCC ) “1011100“ ADDR = 'L' ( ADDR ≦ 0.3VCC ) “0100011“ ADDR Terminal is designed as 3 state buffer for internal test. So that please take care of VCC and DVI supply procedure.Please see P6.
PAGE 14
BH1750FVI Technical Note ●Package Outlines A A Lot No. Product No. WSOF6I ( Unit : mm ) ●About an optical design on the device 0.8 mm 1.3 mm Min.0.4 mm Min.0.4 mm PD area ( 0.25 mm x 0.3 mm ) Please design the optical window so that light can cover at least this area. Min.0.4 mm Min.0.4 mm www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 14/17 2009.04- Rev.
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BH1750FVI Technical Note ●The method of distinguishing 1pin. There is some method of distinguishing 1pin. ① Distinguishing by 1Pin wide-lead ② Distinguishing by die pattern ③ Distinguishing by taper part of 1-3pin side ② (by die patern) is the easiest method to distinguish by naked eye. A A ② ③ Production code ① www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 15/17 2009.04- Rev.
PAGE 16
BH1750FVI 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.
PAGE 17
BH1750FVI Technical Note ●Ordering part number B H 1 Part No. 7 5 0 F Part No. V I - Package FVI: WSOF6I T R Packaging and forming specification TR: Embossed tape and reel WSOF6I 1.6 ± 0.1 (MAX1.8 include BURR) 0.5 0.5 0.3 4 4 1 0.75MAX 0.525 0.27 ±0.05 2 3000pcs 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 ) 1pin (1.
PAGE 18
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.