BH1751FVI-TR Rohm Semiconductor, BH1751FVI-TR Datasheet
BH1751FVI-TR
Specifications of BH1751FVI-TR
Available stocks
Related parts for BH1751FVI-TR
BH1751FVI-TR Summary of contents
Page 1
... Ambient Light Sensor IC Series Digital 16bit Serial Output Type Ambient Light Sensor IC BH1751FVI ●Descriptions BH1751FVI is an digital Ambient Light Sensor IC for I data for adjusting LCD and Keypad backlight power of Mobile phone possible to detect wide range at High resolution 65535 lx ). ●Features 1) I2C bus Interface ( Mode Support) ...
Page 2
... BH1751FVI ● Electrical Characteristics ( VCC = 3.0V, DVI = 3.0V 25℃, unless otherwise noted ) Parameter Supply Current Powerdown Current Peak Wave Length Measurement Accuracy Dark ( Sensor out H-Resolution Mode Resolution L-Resolution Mode Resolution H-Resolution Mode Measurement Time L-Resolution Mode Measurement Time Incandescent / Fluorescent Sensor out ratio ADDR Input ‘ ...
Page 3
... BH1751FVI ●Reference Data 1.2 1 0.8 0.6 0.4 0.2 0 400 500 600 700 800 900 1000 1100 Wavelength [ nm ] Fig.1 Spectral Response 1.2 1 1pin 0 0.6 0 0.2 0 -90 -60 - Angle [ deg ] Fig.4 Directional Characteristics 1 1.2 1 0.8 0.6 0.4 0.2 0 -40 - 100 Ta [ ℃ ] Fig.7 Measurement Accuracy ...
Page 4
... BH1751FVI ●Block Diagram PD ●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 I Data Register → This is for registration of Ambient Light Data. Initial Value is "0000_0000_0000_0000". ...
Page 5
... H-resolution mode2 is also suitable to detect for darkness. ●Explanation of Asynchronous reset and Reset command "0000_0111" 1) Asynchronous reset All registers are reset and BH1751FVI becomes power down during DVI = 'L'. Initial reset is not necessary, because power on reset function is included in this product. 2) Reset command Reset command is for only reset Illuminance data register. ( reset value is '0' )It is not necessary after power supply to VCC because power on reset function is included in this product ...
Page 6
... BH1751FVI ●Timing chart for VCC and DVI power supply sequence 2 DVI bus reference voltage terminal. And it is also asynchronous reset terminal. In DVI 'L' term, internal state is set to Power Down mode.Initial reset is not necessary, because power on reset function is included in this product. DVI supply with VCC supply, or after VCC supply. Please do not become DVI＞ ...
Page 7
... BH1751FVI ●Measurement sequence example from "Write instruction" to "Read measurement result" ex1) Continuously H-resolution mode ( ADDR = 'L' ) from Master to Slave ① Send "Continuously H-resolution mode " instruction ST 0100011 ② Wait to complete 1st H-resolution mode measurement.( max. 180ms. ) ③ Read measurement result 0100011 How to calculate when the data High Byte is "10000011" and Low Byte is "10010000" ...
Page 8
... C BUS is trademark of Phillips Semiconductors. Please refer formality specification for pull up resister. ●Caution of power on reset function BH1751FVI has power on reset (POR) function. POR is to reset all register and flip flop when VCC Power supplies. There are some cautions about power on and down sequence seeing in below. ...
Page 9
... Slave Address is 2 types determined by ADDR Terminal ADDR = ‘H’ ( ADDR ≧ 0.7VCC ) → “1011100“ ADDR = 'L' ( ADDR ≦ 0.3VCC ) → “0100011“ 3) Write Format BH1751FVI is not able to accept plural command without stop condition. Please insert SP every 1 Opecode. Slave Address Read Format ...
Page 10
... BH1751FVI ●Adjust measurement result for influence of optical window. (sensor sensitivity adjusting ) BH1751FVI 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 0.5 times if optical window is set ), influence of optical window is ignored by changing sensor sensitivity from default to 2 times Sensor sensitivity is shift by changing the value of MTreg (measurement time regisiter) ...
Page 11
... BH1751FVI ●H-Resolution Mode2 H-resolution mode2 is 0.5lx (typ.) resolution mode suitable if under less than 10 lx measurement data is necessary. This measurement mode supports “Adjust measurement result for influence of optical window ". Please refer it possible to detect min. 0. using H-resolution mode2. ○Instruction set architecture for H-resolution mode2 ...
Page 12
... BH1751FVI ●Terminal Description PIN No. Terminal Name 1 VCC 2 ADDR 3 GND 4 SDA 5 DVI 6 SCL ※These values are design-value, not guaranteed. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. Equivalent Circuit Power Supply Terminal VCC Slave-address Terminal ADDR = ‘H’ ( ADDR ≧ 0.7VCC ) “1011100“ ...
Page 13
... BH1751FVI ●Package Outlines ●About an optical design on the device 0.8 mm Min.0.4 mm Min.0.4 mm Min.0.4 mm Min.0.4 mm www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. Lot No. Product No. 1 area ( 0. 0 Please design the optical window so that light can cover at least this area. 13/16 Technical Note WSOF6I ( Unit : mm ) 2010 ...
Page 14
... BH1751FVI ●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 ④ Distinguishing by 1Pin line marking ④ (by 1Pin line marking ) is the easiest method to distinguish by naked eye. ④ ① ...
Page 15
... BH1751FVI ●Notes for 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 16
... BH1751FVI ●Ordering part number Part No. Part No. WSOF6I 1.6 ± 0.1 (MAX1.8 include BURR) 0.5 0.5 0.3 0 (1.2) (1. 0.525 0.5 0.3 0.275 S 0.08 S 0.27 ±0.05 0.22 ± 0.05 0.08 M www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved Package FVI: WSOF6I <Tape and Reel information> ...
Page 17
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 ...