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부품번호 | LX1971 기능 |
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기능 | Wide Range Visible Light Sensor | ||
제조업체 | Microsemi Corporation | ||
로고 | |||
전체 9 페이지수
www.DataSheet4U.com
INTEGRATED PRODUCTS
LX1971
Wide Range Visible Light Sensor
PRODUCTION DATA SHEET
DESCRIPTION
The LX1971 is a new technology light Photo current is first multiplied by an
sensor with spectral response that integrated high gain amplifier then the
emulates the human eye; it is pin to pin square root is taken of the product of the
compatible to Microsemi’s LX1970 amplifier and an internal reference current.
visible light sensor however with a wider Finally this is further multiplied converted
dynamic range.
to current and made available at two
This device is ideal for monitoring output pins; one a current source and the
ambient light for the control of artificial other a current sink.
lighting, operation of shades, LED These currents can easily be converted
signage and display, street lighting, to voltage by adding a single resistor at
automotive light sensors and control of either or both outputs. Voltage gain is
backlight dimming. It has a unique photo determined by the resistor value typically
diode arrangement (patents pending) with in the 5KΩ to 50KΩ range.
a peak response at 520nm while sharply With accurate internal gain amplifiers
attenuating both ultra violet and infrared and square root transfer function, design
wavelengths.
complexity and cost are greatly reduced.
The photo sensor is a PIN diode array The LX1971 is available in the Clear 8-
with an accurate and very repeatable pin MSOP package.
current output.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
Approximate Human Eye
Spectral Response
Low IR Sensitivity
Highly Accurate &
Repeatable Output Current
vs. Light
Square root transfer function
Temperature Stable
Integrated High Gain Photo
Current Amplifiers
Complementary Current
Outputs
No Optical Filters Needed
BENIFITS
• Requires no wavelength
filters
• Insensitive to UV and IR
• More than 4 decades usable
light range
• Enables accurate lighting
control systems
VDD
4.7uF
LX1971
4.7uF
PRODUCT HIGHLIGHT
VDD
25K
SNK
SNK
VOUT
SRC
25K
GND
SRC
Ambient
Light
0.60V Typ
0.45V Typ
Copyright 2003
Rev. 1.0,2003-11-25
DataSheet4 U .com
PACKAGE ORDER INFO
TA (°C)
Plastic MSOP
DU 8-Pin
-40 to 85
LX1971IDU
Note: Available in Tape & Reel.
Append the letter “T” to the part number. (i.e. LX1971IDUT)
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
www.DataSheet4U.com
INTEGRATED PRODUCTS
LX1971
Wide Range Visible Light Sensor
PRODUCTION DATA SHEET
APPLICATION INFORMATION
The LX1971 is a light sensor with a spectral response
that resembles the human visual system. It is packaged in
clear MSOP package with the same pin out and same
supply voltage range as Microsemi’s LX1970 light sensor.
The LX1971 responsiveness however differs from that of
the LX1970. In general the LX1971 has lower sensitivity
and a wider dynamic range.
LX1971 Calculated SRC Full Range Response
250
200
150
Whereas the LX1970 has a responsiveness that is
directly proportional to the intensity of light falling on the
photo receptors. There are two different response equations
for the LX1971 depending on the operating range (intensity
of the light). Below 2500 lux, the response resembles a
square root function. Above 2500 lux, the response fits a
straight line curve.
( )IOUT = L ×.808 +1.1µA for L < 2500 lux
IOUT = (L × .0083µA) + 23µA for 2500 lux < L <
20000 lux
100
50
0
0 5000 10000 15000 20000 25000
Incandescent Light (lux)
<2500 Lux Formula
>2500 Lux Formula
LX1971 Calculated SRC Low Level Response
The LX1970 is best suited for applications where the
light sensor is an integral part of a continuous lighting
control system. For example, in an LCD backlighting
application, the level of brightness of the backlight should
be adjusted in proportion to the level of ambient lighting;
the LX1970 can provide closed loop brightness control for
this type of system. For most indoor applications, the 2500
lux saturation point of the LX1970 is usually not a limiting
affect.
50
40
30
20
10
0
The LX1971 is best suited for applications where the
system must respond to external events that affect the
user’s ability to see clearly. For example, a sensor to turn
on headlights or a sensor to adjust the reflectivity of a rear
view mirrors. These systems require the sensor to have
dynamic range similar to sight. Like the human eye, the
square root function of the LX1971 makes it extra sensitive
to small changes at lower light levels. The wide dynamic
range allows the LX1971 to sense the difference between
twilight and daylight or sunshine and heavy cloud cover.
0 500 1000 1500 2000 2500
Incandescent Light (lux)
<2500 Lux Formula
LX1971 Calculated SRC High Level Response
250
200
The following curves show the calculated responsiveness of
the LX1971 without load resistors based on the formulas
above. They can be used as baseline guidelines to calculate
gain setting resistors. The compliance of the current source
output may result in premature saturation of the output when
load resistors are added. The SRC compliance voltage is
specified typically at VDD-600mV @ about 4000 lux.
150
100
50
0
0
5000 10000 15000 20000 25000
Incandescent Light (lux)
>2500 Lux Formula
Copyright 2003
Rev. 1.0,2003-11-25
DataSheet4 U .com
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
4페이지 www.DataSheet4U.com
INTEGRATED PRODUCTS
LX1971
Wide Range Visible Light Sensor
PRODUCTION DATA SHEET
SNK COMPLIANCE VS CURRENT
120
100
80
60
40
20
0
0.1
0.2 0.3 0.4
SNK com pliance Voltage (V)
VDD = 3.0V; RSNK = 25K & 4.7µF
0.5
SRC OUTPUT VS LUMINANCE(LUX)
160
120
I ncand escent
80
40
0
0 3000 6000 9000 12000 15000 18000
Luminance (lux)
VDD = 4.0V; RSNK = 10K & 4.7µF
SRC COMPLIANCE VS CURRENT
100
80
60
40
20
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7
Source Com pliance Voltage (VDD-SRC)
VDD = 3.0V; RSRC = 25K & 4.7µF
0.8
SRC OUTPUT VS LUMINANCE(LUX)
50
I ncand escent
40
30
20
10
0
0 500 1000 1500 2000 2500
Luminance (lux)
VDD = 4.0V; RSNK = 10K & 4.7µ
Copyright 2003
Rev. 1.0,2003-11-25
DataSheet4 U .com
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
LX1970 | Visible Light Sensor | Microsemi Corporation |
LX1971 | Wide Range Visible Light Sensor | Microsemi Corporation |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |