LX1973A ® TM Automotive Light Sensor P RODUCTION D ATA S HEET KEY FEATURES DESCRIPTION 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 The LX1973A internal circuitry consists of a diode array with 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. 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 +85°C). APPLICATIONS Auto headlamp control Auto mirror contrast control WWW . Microsemi .C OM 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. 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 VOUT RLOAD Output (in Volts) LX1973A Part 4.0 3.0 2.0 1.0 0.0 0.001 0.01 0.1 1 10 100 Ambient Light (in lux) LX1973A PACKAGE ORDER INFO TA (°C) -40 to 85 DR Plastic MSOP Reversed Form 8-Pin DU Plastic MSOP 8-pin RoHS Compliant / Pb-free RoHS Compliant / Pb-free LX1973AIDR LX1973AIDU Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1973AIDU-TR) Copyright © 2005 Rev. 1.2, 2009-05-26 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX1973A ® TM Automotive Light Sensor P RODUCTION D ATA S HEET ABSOLUTE MAXIMUM RATINGS PACKAGE PIN OUT VDD VSS BP BP NC NC OUT NC DU PACKAGES (Top View) 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. Plastic MSOP 8-Pin Reverse Form THERMAL RESISTANCE-JUNCTION TO CASE, θJC (Bottom View) 39°C/W 206°C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 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. (Top View) Description VDD Power Supply Voltage VSS Ground Reference for Power and Signal Output OUT Current Output VDD BP NC OUT PACKAGE MARKING FUNCTIONAL PIN DESCRIPTION Name 973A VSS BP NC NC Plastic MSOP 8-Pin THERMAL RESISTANCE-JUNCTION TO CASE, θJC YWWA DU VDD BP NC OUT PACKAGE MARKING 39°C/W 206°C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 973A THERMAL DATA DR YWWA VSS BP NC NC WWW . Microsemi .C OM 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).................................................................... 260° (+0, -5) VDD VSS BP BP NC NC OUT NC DR PACKAGES (Bottom View) BP Internally Connected to Bonding Pad. This Pin Can Be Left Open or Connected to VSS NC No Connection Pin RoHS / Pb-free NiPdAu Finish MSL 2/260°C/1 Year SIMPLIFIED BLOCK DIAGRAM Photopic Sensor with Dark Current Cancellation Pre Amplifier Compression Amplifier PACKAGE DATA VDD OUT VSS Figure 1 – Simplified Block Diagram Copyright © 2005 Rev. 1.2, 2009-05-26 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX1973A ® TM Automotive Light Sensor P RODUCTION D ATA S HEET ELECTRICAL CHARACTERISTICS Parameter Operational Voltage Supply Current Power Supply Rejection Ratio Peak Spectral Response Symbol Test Conditions VDD IDD PSRR λPR EV = 1.0 lux VRIPPLE = 100mVP-P, f = 10kHz; COUT = 0.1µF IDD (λ ) IDD (λ PR ) 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) GL ISAT Dynamic Response Time (to 10% settling error point) 30 -5 85°C except where LX1973A Typ Max 5.5 0.2 0.25 35 580 1 5 IOUT(0.01) IOUT(1.0) IOUT(10) IOUT(100) IOUT (DARK) IOUT (DARK) TDR Units V mA dB nm % See application section for equation 570 µA mm2 0.20 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) EV(white) = 100 lux, EV(810nm) = 14.6µW/cm2, Note 3 Min 4.5 ≤ EV = 0.01 lux @ 25°C, 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 = 20°C, Note 4 EV = 0 lux, TA = 50°C, Note 4 1.0 lux to 0.01 lux 0.01 lux to 1.0 lux 32 103 183 320 EV = 0.01 lux @ 25°C, 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 = 20°C, Note 4 EV = 0 lux, TA = 50°C, Note 4 1.0 lux to 0.01 lux 0.01 lux to 1.0 lux 32 105 187 333 36 114 203 360 450 2100 1.5 0.2 40 125 223 400 900 5000 3 0.5 36 117 208 370 450 2100 1.5 0.2 40 128 229 407 900 5000 3 0.5 WWW . Microsemi .C OM Unless otherwise specified, the following specifications apply over the operating ambient temperature -40°C ≤ TA otherwise noted and the following test conditions: See Note 1, VDD =5V. µA µA µA µLux sec sec µA µA µA µLux sec sec 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. 4 4. Dark Current equivalent lux at 0 lux: ⎡I ⎤ EL= ⎢ OUT ⎥ ÷ (146 × 10 −9 ) ⎣ I REF ⎦ 5. For Flat Top (DU Package), IREF = 5824µA. 6. For Reverse Form (DR Package): IREF = 5985µA ELECTRICALS Copyright © 2005 Rev. 1.2, 2009-05-26 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 LX1973A ® TM Automotive Light Sensor P RODUCTION D ATA S HEET TEST CIRCUITS VDD VDD White LED VDD Part OUT VOUT GND OUT Part White LED RLOAD 810nm LX1973A GND VOUT RLOAD LX1973A WWW . Microsemi .C OM VDD Figure 3 – IR Sensitivity Measurement Circuit Figure 2 – Operational Voltage Measurement Circuit APPLICATION CIRCUITS 5V 5V Part LX1973A 10K 1µF LX1800 VDD SCL To µP REF SCD Part GND AIN ADR AOUT 2.5V DAC/ADC BRT LAMP ELECTRICALS HEADLAMP CONTROLLER Figure 4 – Typical Application Copyright © 2005 Rev. 1.2, 2009-05-26 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LX1973A ® TM Automotive Light Sensor P RODUCTION D ATA S HEET 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 × (E DARK + E AMBIENT ) 0.25 lux Iref = 113.8µA for the Flat Top package Iref = 117µA 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. APPLICATIONS Copyright © 2005 Rev. 1.2, 2009-05-26 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 LX1973A ® TM Automotive Light Sensor P RODUCTION D ATA S HEET SENSITIVITY DARK CURRENT VS TEMP WWW . Microsemi .C OM 100000 500 Dark Current (uLx) Output Current (µA) 450 400 350 300 250 200 150 100 10000 1000 50 0 0.001 0.01 0.1 1 10 100 100 1000 20 Point Source Light (lux) 40 60 80 100 Temperature (C) NORMALIZED (PRE COMPRESSION) 100 LUX OUTPUT VOLTAGE (FLAT TOP) 6 1.2 0.8 LX1973A Human Eye Output voltage Normalized Diode Response 5 1.0 0.6 0.4 5.0V 5.5V 3 2 1 0.2 0 0.0 -0.2 400 4.5V 4 0 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 450 400 300 IOUT @ 100 Lux IOUT @ 10 Lux 250 IOUT @ 1 Lux CHARTS I OUT (µA) 350 200 150 100 50 -50 -40 -10 25 50 85 100 Temperature ºC Load = 10kΩ and 0µF; Copyright © 2005 Rev. 1.2, 2009-05-26 Photo Step = Direct Light Input of 1 lux to 0.01 lux. Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 LX1973A ® TM Automotive Light Sensor P RODUCTION D ATA S HEET PACKAGE DIMENSIONS 8-Pin Miniature Shrink Outline Package (MSOP) Top View D PIN # NAME 1 E S VDD 2 BP 3 NC 4 OUT 5 NC 6 NC 7 BP 8 VSS e E A A1 WWW . Microsemi .C OM DU c L1 L b Ø Dim A A1 b c D e E E1 L L1 S Ø 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° Side Views DR 8-Pin Miniature Shrink Outline Package (MSOP) Reversed Form D PIN # NAME 1 E VDD 2 BP 3 NC 4 OUT 5 NC 6 NC 7 BP 8 VSS S L1 A L c b Ø Copyright © 2005 Rev. 1.2, 2009-05-26 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° Note: 0.12 e 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° MECHANICALS A1 Dim A A1 b c D e E E1 L L1 S Ø 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. E1 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 LX1973A ® TM Automotive Light Sensor P RODUCTION D ATA S HEET PACKAGE INFORMATION WWW . Microsemi .C OM Package Land Pattern 4.8 mm (0.189 in.) VDD VSS BP NC BP NC 0.65 mm (0.023 in.) OUT NC 1.02 mm ( 0.04 in.) 0.41 mm (0.016 in.) DU Package 4.8 mm (0.189 in.) VSS VDD BP BP NC 0.65 mm (0.023 in.) NC NC OUT 1.02 mm ( 0.04 in.) 0.41 mm (0.016 in.) DR Package MECHANICALS Copyright © 2005 Rev. 1.2, 2009-05-26 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 LX1973A ® TM Automotive Light Sensor P RODUCTION D ATA S HEET PACKAGE TAPE AND REEL INFORMATION REF 3.3mm ±0.1 WWW . Microsemi .C OM 4mm ±0.1 Ø 1.55mm ±0.05 2mm ±0.1 Pin 1 0.3mm ±0.05 5.5mm ±0.1 12mm ±0.3 1.0mm ±0.1 3.3mm ±0.1 1.3mm ±0.1 Ø 1.6mm ±0.1 8mm ±0.1 5.3mm ±0.1 0.15mm Ref 0.4mm DU Package Tape and Reel Information 4mm ±0.1 Ø 1.55mm ±0.05 REF 3.3mm ±0.1 2mm ±0.1 Pin 1 0.3mm ±0.05 5.5mm ±0.1 12mm ±0.3 1.0mm ±0.1 3.3mm ±0.1 1.3mm ±0.1 8mm ±0.1 5.3mm ±0.1 Ø 1.6mm ±0.1 0.15mm MECHANICALS Ref 0.4mm DR Package Tape and Reel Information Copyright © 2005 Rev. 1.2, 2009-05-26 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9 LX1973A TM ® Automotive Light Sensor P RODUCTION D ATA S HEET NOTES WWW . Microsemi .C OM 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 © 2005 Rev. 1.2, 2009-05-26 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 10