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부품번호 | BH1721FVC 기능 |
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기능 | Digital 16bit Serial Output Type Ambient Light Sensor IC | ||
제조업체 | ROHM Semiconductor | ||
로고 | |||
전체 19 페이지수
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 -40~85 ℃
Storage Temperature
Tstg -40~100 ℃
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
●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
4페이지 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
① Send "Continuously Auto-resolution mode " instruction
ST 0100011
0 Ack
00010000
② Wait to complete 1st Auto-resolution mode measurement.( max. 180ms )
③ 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
① Send " Continuously L-resolution mode " instruction
ST 0100011
0 Ack
00010011
② Wait to complete L-resolution mode measurement.( max. 24ms )
③ 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
7페이지 | |||
구 성 | 총 19 페이지수 | ||
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부품번호 | 상세설명 및 기능 | 제조사 |
BH1721FVC | Digital 16bit Serial Output Type Ambient Light Sensor IC | ROHM Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |