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BH1721FVC 데이터시트 PDF




ROHM Semiconductor에서 제조한 전자 부품 BH1721FVC은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 BH1721FVC 기능
기능 Digital 16bit Serial Output Type Ambient Light Sensor IC
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BH1721FVC 데이터시트, 핀배열, 회로
Ambient Light Sensor IC Series
Digital 16bit Serial Output Type
Ambient Light Sensor IC
BH1721FVC
No.11046EBT10
Descriptions
BH1721FVC is an digital Ambient Light Sensor IC for I2C 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 - 65528 lx ).
Features
1) I2C bus Interface ( f / s Mode Support, Slave Address : "0100011" )
2) Spectral responsibility is approximately human eye response
3) Illuminance to Digital Converter
4) Wide range and High resolution. (1 – 65528 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) Small measurement variation (+/- 15%)
11) Compact surface mount package 1.6 x 1.6 x 0.55 mm
Applications
Mobile phone, LCD TV, NOTE PC, Portable game machine, Digital camera, Digital video camera, PDA,
LCD display
Absolute Maximum Ratings
Parameter
Symbol
Ratings
Units
Supply Voltage
Vmax
4.5
V
Operating Temperature
Topr -4085
Storage Temperature
Tstg -40100
SDA Sink Current
Imax 7 mA
Power Dissipation
Pd
165
mW
70mm × 70mm × 1.6mm glass epoxy board. Derating in done at 2.2mW/for operating above Ta=25.
Operating Conditions
Parameter
VCC Voltage
I2C Reference Voltage
Symbol
Vcc
VDVI
Min.
2.4
1.65
Ratings
Typ.
3.0
-
Max.
3.6
VCC
Units
V
V
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/15
2011.11 - Rev.B




BH1721FVC pdf, 반도체, 판매, 대치품
BH1721FVC
Block Diagram
VCC
DVI
Technical Note
AMP
PD
ADC
Logic
+
I2C Interface
OSC
GND
SCL
SDA
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.
Logic + I2C Interface
Ambient Light Calculation and I2C BUS Interface. It is including below register.
Data Register This is for registration of Ambient Light Data. Initial Value is "0000_0000_0000_0000".
Measurement Time Register This is for registration of measurement time. Initial Value is "01_0010_1100".
OSC
Internal Oscillator. It is CLK for internal logic.
Measurement Procedure
Power supply
Power Down
Power On
Initial state is Power Down mode after
VCC and DVI supply.
Measurement command
Continuous measurement
State Transition by I2C write-command.
Automatically State Transition
* "Power On" Command is possible to omit.
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
4/15
2011.11 - Rev.B

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BH1721FVC 전자부품, 판매, 대치품
BH1721FVC
Technical Note
Measurement sequence example from "Write instruction" to "Read measurement result"
ex1) Continuously Auto-resolution mode
from Master to Slave
from Slave to Master
Send "Continuously Auto-resolution mode " instruction
ST 0100011
0 Ack
00010000
Wait to complete 1st Auto-resolution mode measurement.( max. 180ms )
Read measurement result.
S T 0100011
1 Ack
High Byte [ 15:8 ]
Low Byte [ 7:0 ]
Ack SP
Ack SP
Ack
How to calculate when the data High Byte is "10000011" and Low Byte is "10010000"
( 215 + 29 + 28 + 27 + 24 ) / 1.2 28067 [ lx ]
The result of continuously measurement mode is updated.
ex2) Continuously L-resolution mode
Send " Continuously L-resolution mode " instruction
ST 0100011
0 Ack
00010011
Wait to complete L-resolution mode measurement.( max. 24ms )
Read measurement result
ST 0100011
1 Ack
High Byte [ 15:8 ]
Ack SP
Ack
Low Byte [ 7:0 ]
Ack SP
How to calculate when the data High Byte is "00000001" and Low Byte is "00010000"
( 28 + 24 ) / 1.2 227 [ lx ]
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
7/15
2011.11 - Rev.B

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부품번호상세설명 및 기능제조사
BH1721FVC

Digital 16bit Serial Output Type Ambient Light Sensor IC

ROHM Semiconductor
ROHM Semiconductor

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