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LX1973A
TM (R)
Automotive Light Sensor
PRODUCTION DATA SHEET
DESCRIPTION
KEY FEATURES Nearly Perfect Best EyeTM 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
The LX1973A is a wide dynamic range light sensor with a very low dark current that is optimized for sensing low level light signals that typically occur under dark or 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. The spectral response of the integrated light sensor closely 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.
The LX1973A internal circuitry consists of a diode array with Microsemi's Best EyeTM 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. The LX1973A is internally trimmed 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 +85C).
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APPLICATIONS
Auto headlamp control Auto mirror contrast control
IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com Protected By US Patents: 6,787,757; Patents Pending
PRODUCT HIGHLIGHT
LX1973A Response
5V
Output (in Volts)
4.0 3.0 2.0 1.0 0.0 0.001
LX1973A Part
VOUT RLOAD
0.01
0.1
1
10
100
Ambient Light (in lux)
PACKAGE ORDER INFO
LX1973A LX1973A
TA (C) -40 to 85
DR
Plastic MSOP Reversed Form 8-Pin
RoHS Compliant / Pb-free
DU
Plastic MSOP 8-pin LX1973AIDU
RoHS Compliant / Pb-free
LX1973AIDR
Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX1973AIDU-TR)
Copyright (c) 2005 Rev. 1.1, 2006-12-15
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX1973A
TM (R)
Automotive Light Sensor
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS 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 +85C Storage Temperature Range.......................................................................... -40 to +100C RoHS / Pb-free Peak Package Solder Reflow Temperature (40 seconds maximum exposure).................................................................... 260 (+0, -5)
Notes: 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. Solder reflow to follow: IPC/JEDEC J-STD-020B 7/02 Pb-SN Small Body Profile
PACKAGE PIN OUT
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VDD N.C. N.C. OUT
DU PACKAGES
(Top View)
VSS N.C. N.C. N.C.
YWWA
VSS N.C. N.C. N.C.
THERMAL DATA
VDD N.C. N.C. OUT
PACKAGE MARKING
(Bottom View)
973A
DR
Plastic MSOP 8-Pin Reverse Form 39C/W 206C/W
THERMAL RESISTANCE-JUNCTION TO CASE, JC
YWWA
THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA
DU
Plastic MSOP 8-Pin 39C/W 206C/W
VSS N.C. N.C. N.C.
VDD N.C. N.C. OUT
973A
THERMAL RESISTANCE-JUNCTION TO CASE, JC
THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA
PACKAGE MARKING
(Top View)
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
FUNCTIONAL PIN DESCRIPTION Name VDD VSS OUT Power Supply Voltage Ground Reference for Power and Signal Output Output Current SIMPLIFIED BLOCK DIAGRAM Description
VDD N.C. N.C. OUT
DR PACKAGES
(Bottom View)
VSS N.C. N.C. N.C.
RoHS / Pb-free 100% NiPdAu Finish
VDD
PACKAGE DATA PACKAGE DATA
Photopic Sensor with Dark Current Cancellation
Pre Amplifier
Compression Amplifier
OUT
GND
Figure 1 - Simplified block Diagram
Copyright (c) 2005 Rev. 1.1, 2006-12-15
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX1973A
TM (R)
Automotive Light Sensor
PRODUCTION DATA SHEET
Unless otherwise specified, the following specifications apply over the operating ambient temperature -40C TA otherwise noted and the following test conditions: See Note 1, VDD =5V. Parameter Operational Voltage Supply Current Power Supply Rejection Ratio Peak Spectral Response Infrared Response Light to Current Gain Saturation Current Radiant Sensitive Area Flat Top Package (note 5) Output Current Output Current Output Current Output Current Dark Current (equivalent lux) Symbol VDD IDD PSRR PR Test Conditions EV = 1.0 lux VRIPPLE = 100mVP-P, f = 10kHz; COUT = 0.1F EV(white) = 100 lux, EV(810nm) = 14.6W/cm, Note 3 See application section for equation 570 Min 4.5 30 -5
ELECTRICAL CHARACTERISTICS
85C except where
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LX1973A Typ Max 5.5 0.2 0.25 35 580 1 5
Units V mA dB nm % A mm2
IDD ( ) IDD ( PR ) GL ISAT
IOUT(0.01) IOUT(1.0) IOUT(10) IOUT(100) IOUT (DARK)
0.20 EV = 0.01 lux @ 25C, Note 1,2 EV = 1.0 lux, Note 1,2 EV = 10 lux, Note 1,2 EV = 100 lux, Note 1,2 EV = 0 lux, TA = 20C, Note 4 EV = 0 lux, TA = 50C, Note 4 1.0 lux to 0.01 lux 0.01 lux to 1.0 lux EV = 0.01 lux @ 25C, Note 1,2 EV = 1.0 lux, Note 1,2 EV = 10 lux, Note 1,2, EV = 100 lux, Note 1,2 EV = 0 lux, TA = 20C, Note 4 EV = 0 lux, TA = 50C, Note 4 1.0 lux to 0.01 lux 0.01 lux to 1.0 lux 32 103 183 320 36 114 203 360 450 2100 1.5 0.2 36 117 208 370 450 2100 1.5 0.2 40 125 223 400 900 5000 3 0.5 40 128 229 407 900 5000 3 0.5
A A A Lux sec sec A A A Lux sec sec
Dynamic Response Time TDR (to 10% settling error point) Reverse Form Package (note 6) Output Current IOUT(0.01) Output Current IOUT(1.0) Output Current IOUT(10) Output Current IOUT(100) Dark Current (equivalent lux) Dynamic Response Time (to 10% settling error point) IOUT (DARK) TDR
32 105 187 333
Notes: 1. The input irradiance is supplied from a point source which is a white light emitting diode (LED); Fairchild Semiconductor part number MV8W00. 2. See Figure 2. 3. See Figure 3.
I 4. Dark Current equivalent lux at 0 lux: EL= OUT / (146 x 10 - 9 ) I REF 5. For Flat Top (DU Package), IREF = 5824A. 6. For Reverse Form (DR Package): IREF = 5985A
4
ELECTRICALS ELECTRICALS
Copyright (c) 2005 Rev. 1.1, 2006-12-15
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX1973A
TM (R)
Automotive Light Sensor
PRODUCTION DATA SHEET
TEST CIRCUITS
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VDD VDD White LED Part OUT GND LX1973A VOUT RLOAD
VDD VDD White LED OUT Part 810nm GND LX1973A VOUT RLOAD
Figure 2 - Operational Voltage Measurement Circuit
Figure 3 - IR Sensitivity Measurement Circuit
APPLICATION CIRCUITS
5V
5V
Part LX1973A
10K 1F
LX1800
SCL To P SCD GND ADR VDD REF 2.5V
Part
AIN
AOUT
DAC/ADC
BRT HEADLAMP CONTROLLER LAMP
ELECTRICALS ELECTRICALS
Figure 4 - Typical Application
Copyright (c) 2005 Rev. 1.1, 2006-12-15
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX1973A
TM (R)
Automotive Light Sensor
PRODUCTION DATA SHEET
APPLICATIONS
WWW .Microsemi .C OM
GENERAL DESCRIPTION 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 accuracy across several decades. The sensitivity function is:
I OUT (P )=
Iref 0.25 x [E DARK + E AMBIENT ] 0.25 lux
Iref = 113.8A for the Flat Top package Iref = 117A for the Reverse Flat Top package EDARK = dark current equivalent lux expressed in lux from a white LED point source. EAMBIENT = ambient illumination expressed in lux from a white LED point source.
A APPLICATIONS
Copyright (c) 2005 Rev. 1.1, 2006-12-15
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
LX1973A
TM (R)
Automotive Light Sensor
PRODUCTION DATA SHEET
SENSITIVITY
DARK CURRENT VS TEMP
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100000
500 400 350 300 250 200 150 100 50 0 0.001 0.01 0.1 1 10 100 1000
Dark Current (uLx)
450 Output Current (A)
10000
1000
100 20 40 60 Temperature (C) 80 100
Point Source Light (lux)
NORMALIZED (PRE COMPRESSION)
1.2
100 LUX OUTPUT VOLTAGE (FLAT TOP)
6 5
Normalized Diode Response
1.0 0.8 0.6 0.4 0.2 0.0 -0.2 400
Output voltage
LX1973A Human Eye
4 3 2 1 0 0
4.5V
5.0V
5.5V
2
4
6
8
10
12
14
Load Resistor (in kilo-ohms)
600 800 Wavelength (nm)
1000
IOUT STEP RESPONSE (FLAT TOP)
IOUT OVER TEMP @ 100 LUX, 10 LUX, 1 LUX
450 400 350 I OUT (A) 300 250 200 150 100 50 -50 IOUT @ 100 Lux IOUT @ 10 Lux IOUT @ 1 Lux
CHARTS CHARTS
-40
-10
25
50
85
100
Temperature C
Load = 10k and 0F;
Photo Step = Direct Light Input of 1 lux to 0.01 lux.
Copyright (c) 2005 Rev. 1.1, 2006-12-15
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
LX1973A
TM (R)
Automotive Light Sensor
PRODUCTION DATA SHEET
PACKAGE DIMENSIONS
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DU
8-Pin Miniature Shrink Outline Package (MSOP)
D
Top View
PIN # NAME
8 7 6 5
1 2 3 4 5 6 7 8
VDD N.C. N.C. OUT N.C. N.C. N.C. VSS
E1
1 2 3 4
S
e E A A1 b L
Side Views
c L1
Dim A A1 b c D e E E1 L L1 S
MILLIMETERS MIN MAX - 1.10 0.05 0.15 0.26 0.41 0.13 0.23 2.90 3.10 0.65 BSC 4.75 5.05 2.90 3.10 0.41 0.71 0.95 BSC 0.525 BSC 3
INCHES MIN MAX - 0.043 0.002 0.006 0.010 0.016 0.005 0.009 0.114 0.122 0.025 BSC 0.187 0.198 0.114 0.122 0.016 0.028 0.037 BSC 0.021 BSC 3
DR
8-Pin Miniature Shrink Outline Package (MSOP) Reversed Form
D
E
b A1
c
L1 L
O
Dim A A1 b C D E E1 e L L1 O
Note:
MILLIMETERS MIN MAX 1.100 0.050 0.150 0.280 0.380 0.130 0.230 2.900 3.100 4.750 5.050 2.900 3.100 0.650 BSC 0.406 0.686 0.940 REF 8
INCHES MIN MAX 0.043 0.002 0.006 0.011 0.015 0.005 0.009 0.114 0.122 0.187 0.198 0.114 0.122 0.025 BSC 0.016 0.027 0.037 REF 8
MECHANICALS MECHANICALS
A e
0.12
E1
Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006") on any side. Lead dimension shall not include solder coverage.
Copyright (c) 2005 Rev. 1.1, 2006-12-15
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
LX1973A
TM (R)
Automotive Light Sensor
PRODUCTION DATA SHEET
PACKAGE INFORMATION
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Package Land Pattern
4.8 mm (0.189 in.)
VDD N.C. N.C. OUT
1.02 mm ( 0.04 in.) 0.41 mm (0.016 in.) 0.65 mm (0.023 in.)
VSS N.C. N.C. N.C.
DU Package
4.8 mm (0.189 in.)
VSS N.C. N.C. N.C.
1.02 mm ( 0.04 in.) 0.41 mm (0.016 in.) 0.65 mm (0.023 in.)
VDD N.C. N.C. OUT
DR Package
MECHANICALS MECHANICALS
Copyright (c) 2005 Rev. 1.1, 2006-12-15
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
LX1973A
TM (R)
Automotive Light Sensor
PRODUCTION DATA SHEET
PACKAGE TAPE AND REEL INFORMATION
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4mm 0.1 O 1.55mm 0.05 0.3mm 0.05 5.5mm 0.1 12mm 0.3 REF 3.3mm 0.1 2mm 0.1 Pin 1
1.0mm 0.1 3.3mm 0.1 1.3mm 0.1 5.3mm 0.1 8mm 0.1 O 1.6mm 0.1
0.15mm Ref 0.4mm
DU Package Tape and Reel Information
4mm 0.1 O 1.55mm 0.05 0.3mm 0.05 5.5mm 0.1 12mm 0.3 REF 3.3mm 0.1 2mm 0.1 Pin 1
1.0mm 0.1 3.3mm 0.1 1.3mm 0.1 5.3mm 0.1 8mm 0.1 O 1.6mm 0.1
0.15mm
MECHANICALS MECHANICALS
Ref 0.4mm
DR Package Tape and Reel Information
Copyright (c) 2005 Rev. 1.1, 2006-12-15
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
LX1973A
TM (R)
Automotive Light Sensor
PRODUCTION DATA SHEET
NOTES
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NOTES NOTES
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 necessarily include testing of all parameters. Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time.
Copyright (c) 2005 Rev. 1.1, 2006-12-15
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 10

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