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  Microsemi Electronic Components Datasheet  

LX1973B Datasheet

Automotive Light Sensor

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LX1973B pdf
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
VOUT
3
2
RLOAD
1
0
0.001
0.01
0.1
1
Am bient Light (lux)
10
100
TA (°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: 714-893-2570
Page 1


  Microsemi Electronic Components Datasheet  

LX1973B Datasheet

Automotive Light Sensor

No Preview Available !

LX1973B pdf
LX1973B
® Automotive Light Sensor
TM
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
VDD ................................................................................................................. -0.3 to 6 VDC
SNK/SRC (Output Compliance Voltage)........................................... -0.3 to VDD + 0.3VDC
SNK/SRC (Maximum Output Current)................................................... Internally Limited
Operating Temperature Range ........................................................................ -40 to +85°C
Storage Temperature Range.......................................................................... -40 to +100°C
RoHS / Pb-free Peak Package Solder Reflow Temperature
(40 seconds maximum exposure)..................................................................240°C (+0, -5)
Notes:
1. Exceeding these ratings could cause damage to the device. All voltages are with
respect to Ground. Currents are positive into, negative out of specified terminal.
VDD
NC
NC
OUT
VSS
NC
NC
NC
PL PACKAGES
(Top View)
VSS
NC
NC
NC
VDD
NC
NC
OUT
THERMAL DATA
PL Plastic MSOP Domed 8-Pin
PR Plastic MSOP Domed 8-Pin Reverse Form
THERMAL RESISTANCE-JUNCTION TO CASE, θJC
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
39°C/W
206°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device / pc-board
system. All of the above assume no ambient airflow.
Name
VDD
VSS
OUT
FUNCTIONAL PIN DESCRIPTION
Pin Description
1 Power Supply Voltage
8 Ground Reference for Power and Signal Output
4 Output Current
PL PACKAGE MARKING
(Bottom View)
VSS
VDD
NC NC
NC NC
NC OUT
PR PACKAGE MARKING
(Top View)
VDD
NC
NC
OUT
PR PACKAGES
(Bottom View)
VSS
NC
NC
NC
NC – No Connection
MSL3/240°C/168 Hours
SIMPLIFIED BLOCK DIAGRAM
PACKAGE
VDD
Photopic
Sensor with
Dark Current
Cancellation
Pre Amplifier
Compression
Amplifier
OUT
LX1973B
Figure 1 – Simplified Block Diagram
GND
LX1973BIPL
LX1973BIPR
Copyright © 2007
Rev. 1.3, 2008-01-11
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2


Part Number LX1973B
Description Automotive Light Sensor
Maker Microsemi
Total Page 8 Pages
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