LX1973B Datasheet, PDF (1/8 Pages) Microsemi Corporation – Automotive Light Sensor TM

LX1973B
®
Automotive Light Sensor
TM
PRODUCTION DATA SHEET
DESCRIPTION
The LX1973B is a wide dynamic The LX1973B internal circuitry
range light sensor with a very low consists of a diode array with
dark current that is optimized for Microsemi’s Best Eye™ processing that
sensing low level light signals that provides a nearly perfect photopic light
typically occur under dark or darkening wavelength response curve. The sensor
outdoor ambient lighting.
output feeds into a wide dynamic range
The LX1973B has been optimized compression amplifier that provides
for automotive systems such as accurate resolution over five decades of
headlamp brightness control or rear ambient light. The integrated dark
view mirror contrast control. Its current cancellation circuit facilitates
radical (fractional exponent) response accurate sensing of light below 0.01
when interfaced with an 8 bit DAC Lux. The current source output of the
can detect levels down to 0.001 Lux LX1973B can be gain scaled using one
or levels as high as 500 Lux.
external resistor.
The spectral response of the The LX1973B is internally trimmed
integrated light sensor closely to an initial accuracy of 5% at room
emulates the human eye so it ignores temperature and a light level of 10 Lux.
light such as infrared which emits Accuracy of 10% is maintained over the
energy but doesn’t aid vision. This full temperature range (-40 to +85ºC).
eliminates the need for an Infrared
filter required with competitor’s light
sensors.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Protected By US Patents: 6,787,757; Patents Pending
KEY FEATURES
ƒ Nearly Perfect Best Eye™
Human Eye Spectral Response
ƒ Dark Current < 0.0005 Lux (@
25°C)
ƒ 5 Decades Compressed Output
ƒ 10% Accuracy Over
Temperature
ƒ Scalable Output Voltage
ƒ No Optical Filters Needed
APPLICATIONS
ƒ Auto Headlamp Control
ƒ Auto Mirror Contrast Control
5V
LX1973B Part
PRODUCT HIGHLIGHT
LX1973B Response
4
3
VOUT
2
R_LOAD
1
0
0.001
0.01
0.1
1
Am bient Light (lux)
10
100
T_A (°C)
-40 to 85
PACKAGE ORDER INFO
PL
Plastic MSOP Domed
8-Pin
PR
Plastic MSOP Domed
8-Pin Reverse Form
RoHS Compliant / Pb-free, NiPdAu Finish
RoHS Compliant / Pb-free, NiPdAu Finish
LX1973BIPL
LX1973BIPR
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1973BIPL-
xxxxx-TR)
Copyright © 2007
Rev. 1.3, 2008-01-11
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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