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Ambient Light Sensor ICs
Digital 16bit Serial Output Type
Ambient Light Sensor IC
BH1730FVC
●Descriptions
BH1730FVC is a digital Ambient Light Sensor IC for I
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
2
1) I
C 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
Supply Voltage
INT , SDA, DVI, SCL, Terminal Voltage
Operating Temperature
Storage Temperature
SDA, INT Sink Current
Power Dissipation
※ 70mm × 70mm × 1.6mm glass epoxy board. Derating in done at 3.47mW/℃ for operating above Ta=25℃.
●Operating Conditions
Parameter
VCC Voltage
2
I
C Reference Voltage
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
2
C bus interface. This IC is the most suitable to obtain the ambient light
Symbol
V
max
CC
V
max, V
max, V
max, V
INT
SDA
DVI
Topr
Tstg
Imax
Pd
Symbol
Min.
Vcc
2.4
V
1.65
DVI
1/20
Limits
Units
4.5
max
7
SCL
-40～70
-40～100
7
mA
260
※
mW
Typ.
Max.
Units
3.0
3.6
-
V
CC
2012.02 - Rev.A
No.11046EAT13
V
V
℃
℃
V
V
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Summary of Contents for Rohm BH1730FVC
- Page 1 No.11046EAT13 ●Descriptions BH1730FVC is a 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 backlight power of TV, mobile phone. It is possible to detect very wide range light intensity. (0.008 - 65535 lx ).
- Page 2 C ‘H’ Period of the SCL Clock tHIGH µs － － C SDA Output ‘L’ Voltage － IOL = 3 mA ※1 White LED is used as optical source. www.rohm.com 2012.02 - Rev.A 2/20 © 2012 ROHM Co., Ltd. All rights reserved.
- Page 3 Ta [ ℃ ] VCC [ V ] DVI [ V ] Fig.12 Measurement Result Fig.11 Measurement Result Fig.10 Power down ICC@0Lx DVI Dependency VCC Dependency Temperature Dependency www.rohm.com 2012.02 - Rev.A 3/20 © 2012 ROHM Co., Ltd. All rights reserved.
- Page 4 Internal oscillator ( typ. 360kHz ). It is clock for internal logic. ・POR Power on reset. All register is reset after VCC is supplied. Please refer P14 (Caution of power on reset function). www.rohm.com 2012.02 - Rev.A 4/20 © 2012 ROHM Co., Ltd. All rights reserved.
- Page 5 ※ 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 ………...
- Page 6 ●Explanation of Asynchronous reset and Software reset command. 1) Asynchronous reset All registers are reset and BH1730FVC becomes power down during DVI = 'L'. Initial reset is not necessary, because power on reset function is included in this product. 2) Software reset command All registers are reset and BH1730FVC becomes power down by Software reset command.
- Page 7 00001 : Interrupt output reset. 4 : 0 00010 : Stop manual integration mode. Special command 00011 : Start manual integration mode. 00100 : Software reset Don’t input other commands. www.rohm.com 2012.02 - Rev.A 7/20 © 2012 ROHM Co., Ltd. All rights reserved.
- Page 8 10110110 : 74 cycle. 199.8ms. 01101100 : 148 cycle. 399.6ms. 00000001 : 255 cycle. 688.5ms. Cycle is defined 256-ITIME<7:0>. Integration time is typically cycle*2.7ms. ADC needs additional 2ms for internal calculation. www.rohm.com 2012.02 - Rev.A 8/20 © 2012 ROHM Co., Ltd. All rights reserved.
- Page 9 Change ADC resolution. X00 : X1 gain mode GAIN 2 : 0 X01 : X2 gain mode X10 : X64 gain mode X11 : X128 gain mode www.rohm.com 2012.02 - Rev.A 9/20 © 2012 ROHM Co., Ltd. All rights reserved.
- Page 10 Upper byte ○DATA1 (16h,17h) ADC Type1 data default value 00h Type Register Address Description DATA1 LSBs 7 : 0 Lower byte DATA1 MSBs 7 : 0 Upper byte www.rohm.com 2012.02 - Rev.A 10/20 © 2012 ROHM Co., Ltd. All rights reserved.
- Page 11 If you don't use INT Pin, please connect to GND or open. INT pin pull up resister C bus pull up resister 100kohm 2.2kΩ 2.2kΩ C bus voltage source BH1730FVC 0.1µF 0.1µF Micro Controller www.rohm.com 2012.02 - Rev.A 11/20 © 2012 ROHM Co., Ltd. All rights reserved.
- Page 12 ●Lux calculation from DATA0 and DATA1 BH1730FVC has two outputs, DATA0 (14h, 15h) for detecting visible light and infrared light, and DATA1 (16h, 17h) for detecting infrared light. Lux value can be calculated by using these two outputs. The calculation formula depends on the characteristic of optical window.
- Page 13 BH1730FVC ● Interrupt function Interrupt function compares measurement result to preset interrupt threshold level. BH1730FVC uses two threshold level (upper and lower ). If measurement result is outside of two threshold, INT pin outputs ’L’. Interrupt threshold is defined at Interrupt threshold registers ( 03h - 06h ).
- Page 14 ●Caution of power on reset function BH1730FVC has power on reset ( POR ) function. POR is to reset all register and flip flop when VCC Power supplies. There is some cautions about power on and down sequence seeing in below.
- Page 15 ●ALS sensitivity adjustment function BH1730FVC is possible to change ALS sensitivity. And it is possible to cancel the optical window influence (difference with / without optical window ) by using this function. Adjustment 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...
- Page 16 DVI terminal is pulled down by 150kOhm while DVI is set 'L' C bus Interface SCL terminal ※These values are design-value, not guaranteed. www.rohm.com 2012.02 - Rev.A 16/20 © 2012 ROHM Co., Ltd. All rights reserved.
- Page 17 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 2012.02 - Rev.A 17/20 © 2012 ROHM Co., Ltd. All rights reserved.
- Page 18 ② Distinguishing by die pattern ③ Distinguishing by taper part of 1-3pin side ②(by die pattern) is the easiest method to distinguish by naked eye. ② ③ Production code ① www.rohm.com 2012.02 - Rev.A 18/20 © 2012 ROHM Co., Ltd. All rights reserved.
- Page 19 ) Please mount by Footprint dimensions described in the Jisso Information for WSOF6I. This pad is GND level, therefore there is a possibility that LSI malfunctions and heavy-current is generated. www.rohm.com 2012.02 - Rev.A 19/20 © 2012 ROHM Co., Ltd. All rights reserved.
- Page 20 (1.2) 1pin 1PIN MARK 0.145±0.05 0.08 S Direction of feed 0.22±0.05 0.08 Reel ∗ (Unit : mm) Order quantity needs to be multiple of the minimum quantity. www.rohm.com 2012.02 - Rev.A 20/20 © 2012 ROHM Co., Ltd. All rights reserved.
- Page 21 ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing.
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