LX1973AIDR MICROSEMI [Microsemi Corporation], LX1973AIDR Datasheet

LX1973AIDR

Manufacturer Part Number

LX1973AIDR

Description

Automotive Light Sensor

Manufacturer

MICROSEMI [Microsemi Corporation]

Datasheet

1.LX1973AIDR.pdf (10 pages)

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Rev. 1.1, 2006-12-15

range light sensor with a very low

dark current that is optimized for

sensing low level light signals that

typically

darkening outdoor ambient lighting.

The LX1973A has been optimized for

automotive systems such as headlamp

brightness control or rear view mirror

contrast control. Its radical (fractional

exponent) response when interfaced

with an 8 bit DAC can detect levels

down to 0.001 lux or levels as high as

500 lux.

integrated

emulates the human eye so it ignores

light such as infrared which emits

energy but doesn’t aid vision. This

eliminates the need for an Infrared

filter required with competitor’s light

sensors.

IMPORTANT: For the most current data, consult MICROSEMI’s website:

Protected By US Patents: 6,787,757; Patents Pending

The LX1973A is a wide dynamic

The

spectral

occur

light

response

under

-40 to 85

sensor

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1973AIDU-TR)

(°C)

LX1973A

dark

D E S C R I P T I O N

Part

closely

the

consists

Microsemi’s Best Eye™ processing that

provides a nearly perfect photopic light

wavelength response curve. The sensor

output feeds into a wide dynamic range

compression amplifier that provides

accurate resolution over five decades of

ambient light. The integrated dark

current cancellation circuit facilitates

accurate sensing of light below 0.01

lux. The current source output of the

LX1973A can be gain scaled using one

external resistor.

to an initial accuracy of 5% at room

temperature and a light level of 10lux.

Accuracy of 10% is maintained over the

full temperature range (-40 to +85°C).

Plastic MSOP Reversed Form

8-Pin

The LX1973A internal circuitry

The LX1973A is internally trimmed

RoHS Compliant / Pb-free

P R O D U C T H I G H L I G H T

P A C K A G E O R D E R I N F O

LX1973AIDR

LOAD

Integrated Products Division

OUT

Microsemi

http://www.microsemi.com

4.0

3.0

2.0

1.0

0.0

0.001

diode

LX1973A Response

0.01

Ambient Light (in lux)

array

0.1

Automotive Light Sensor

with

RODUCTION

RoHS Compliant / Pb-free

LX1973AIDU

Plastic MSOP

8-pin

100

Nearly Perfect Best Eye™

Human Eye Spectral Response

25C Dark Current <0.005 lux

5 Decades Compressed Output

10% Accuracy Over

Temperature

Scalable Output Voltage

No Optical Filters Needed

Auto headlamp control

Auto mirror contrast control

ATA

K E Y F E A T U R E S

A P P L I C A T I O N S

HEET

LX1973A

Page 1

Related parts for LX1973AIDR

LX1973AIDR Summary of contents

Page 1

... LOAD 0.0 0.001 0.01 0.1 Ambient Light (in lux Plastic MSOP Reversed Form DU 8-Pin RoHS Compliant / Pb-free LX1973AIDR Microsemi Integrated Products Division LX1973A RODUCTION ATA HEET Nearly Perfect Best Eye™ ...

Page 2

................................................................................................................. -0 SNK/SRC (Output Compliance Voltage)........................................... -0 SNK/SRC (Maximum Output ...

Page 3

TM Unless otherwise specified, the following specifications apply over the operating ambient temperature -40°C otherwise noted and the following test conditions: See Note 1, V Parameter Operational Voltage Supply Current Power Supply Rejection Ratio Peak Spectral Response Infrared Response Light ...

Page 4

White Part OUT LED GND LX1973A Figure 2 – Operational Voltage Measurement Circuit To µP Copyright © 2005 Rev. 1.1, 2006-12-15 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 ® Automotive Light Sensor ...

Page 5

ENERAL ESCRIPTION The LX1973A produces an output current that is sensitive to the level of ambient light that falls onto the photosensitive area of the IC package. The sensitivity is amplified and compressed to provide ratio metric ...

Page 6

500 450 400 350 300 250 200 150 100 50 0 0.001 0.01 0.1 1 Point Source Light (lux ...

Page 7

TM DU 8-Pin Miniature Shrink Outline Package (MSOP) D Top View Side Views DR 8-Pin Miniature Shrink Outline Package (MSOP) Reversed Form ...

Page 8

TM Package Land Pattern V DD N.C. N.C. OUT V SS N.C. N.C. N.C. Copyright © 2005 Rev. 1.1, 2006-12-15 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 ® Automotive Light Sensor ...

Page 9

Ø 1.55mm ±0.05 0.3mm ±0.05 5.5mm ±0.1 1.0mm ±0.1 1.3mm ...

Page 10

TM PRODUCTION DATA – Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not ...

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