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PDF BH1730FVC Data sheet ( Hoja de datos )
| Número de pieza | BH1730FVC | |
| Descripción | Digital 16bit Serial Output Type Ambient Light Sensor IC | |
| Fabricantes | ROHM Semiconductor | |
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BH1730FVC
Ambient Light Sensor ICs
Digital 16bit Serial Output Type
Ambient Light Sensor IC
BH1730FVC
No.11046EAT13
●Descriptions
BH1730FVC is a digital Ambient Light Sensor IC for I2C bus interface. This IC is the most suitable to obtain the ambient light
data for adjusting LCD backlight power of TV, mobile phone. It is possible to detect very wide range light intensity. (0.008 -
65535 lx ).
●Features
1) I2C bus Interface ( f / s Mode Support, Slave address "0101001". )
2) There are two outputs that peaks of a spectrum response are in visible light (Type0) and in infrared light (Type1).
3) Illuminance to Digital Converter
4) Very wide range and High resolution. ( 0.008 - 65535 lx )
5) Low Current by power down function
6) 50Hz / 60Hz light noise reject-function
7) Correspond to 1.8V logic input interface
8) Light source dependency is little by calculating with Type0 and Type1.
( ex. Incandescent Lamp. Fluorescent Lamp. Halogen Lamp. White LED. Sun Light )
9) Interrupt function is available.
10) Adjustable measurement result for influence of optical window
( It is possible to detect min. 0.001 lx, max. 100000 lx by using this function. )
11) Small measurement variation (+/- 15%)
12) Built in power on reset circuit.
●Applications
LCD TV, Mobile phone, NOTE PC, Portable game machine, Digital camera, Digital video camera, PDA, LCD display
●Absolute Maximum Ratings
Parameter
Symbol
Limits
Supply Voltage
VCCmax
4.5
INT , SDA, DVI, SCL, Terminal Voltage
VINTmax, VSDAmax, VDVImax, VSCLmax
7
Operating Temperature
Topr -40～70
Storage Temperature
Tstg -40～100
SDA, INT Sink Current
Imax
7
Power Dissipation
Pd 260※
※ 70mm × 70mm × 1.6mm glass epoxy board. Derating in done at 3.47mW/℃ for operating above Ta=25℃.
Units
V
V
℃
℃
mA
mW
●Operating Conditions
Parameter
VCC Voltage
I2C Reference Voltage
Symbol
Min.
Typ.
Max.
Units
Vcc 2.4 3.0 3.6 V
VDVI
1.65
-
VCC
V
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
1/20
2012.02 - Rev.A
1 page  
BH1730FVC
Technical Note
●I2C Bus Access and Write / Read format
1 ) I2C Bus interface timing chart
Write measurement command and Read measurement result are done by I2C Bus interface. Please refer the formally
specification of I2C Bus interface, and follow the formally timing chart.
SDA
tf
SCL
S
tLOW
tHD ; STA
2) Main write Format
tr tSU ; DAT
tHD ; DAT
tHtIGH
1. Case of “Write to Command Register”
tf
tSU ; STA
tHtHD ;DSTA
Sr
tr tBUF
tSU;STO
P
S
ST
Slave Address
0101001
W
0
ACK
Data to Command Register
1XXXXXXX
ACK SP
2. Case of “Write to Data Register”
ST
Slave Address
0101001
W
0
ACK
Data specified at register address field
0XXXXXXX
ACK
Data specified at register address
field +1
ACK
・・・
ACK
Data specified at register address
field +N
ACK
SP
※ The register address that set in Command register is used.
3. Case of "write to data register after write to Command Register"
ST
Slave Address
0101001
W
0
ACK
Data to Command Register
1XXXXXXX
ACK
Data specified at register address
field
ACK
・・・
ACK
Data specified at register address
field +N
ACK
SP
3) Main read Format
ST
Slave Address
0101001
R
1
ACK
Data specified at register address field
ACK
Data specified at register
address field +1
ACK
・・・ ACK
Data specified at register
address field +N
NACK SP
※ The register address that set in Command register is used.
from master to slave
from slave to master
※ BH1730FVC operates as I2C bus slave device.
※ Please refer formality I2C bus specification of NXP semiconductor
BH1730FVC continues to write or read data with address increments until master issues stop condition.
Read cycle is 00h - 01h - 02h - 03h - 04h - 05h - 06h – 07h – 12h – 14h – 15h – 16h – 17h - 00h ………
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
5/20
2012.02 - Rev.A
5 Page 
BH1730FVC
●Measurement sequence example from "Write to start measurement" to "Read measurement result"
Technical Note
from Master to Slave
from Slave to Master
① Send "Continuous measurement mode" instruction
ST
Slave Address
0101001
W
0
ACK
Write Command Register
1000_0000
ACK
Write CONTROL register
0000_0011
ACK SP
② Wait to complete 1st measurement. TIMING=DAh (typ. 100ms, max.150ms) and GAIN=00h (X1 Gain) at default.
③ Read measurement result.
ST
Slave Address
0101001
W
0
ACK
Write Command Register
1001_0100
ACK SP
ST
Slave Address
0101001
R
1
ACK
Read DATA0 LSBs register
ACK
Read DATA0 MSBs register
ACK
Read DATA1 LSBs register
ACK
Read DATA1 MSBs register
NACK SP
●Application circuit example
If you don't use INT Pin, please connect to GND or open.
INT pin pull up resister
I2C bus pull up resister
0.1µF
100kohm
BH1730FVC
VCC
INT
GND
SCL
DVI
SDA
2.2kΩ
2.2kΩ
0.1µF
I2C bus voltage source
Micro
Controller
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
11/20
2012.02 - Rev.A
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet BH1730FVC.PDF ] | |
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