Microsemi LX1973AIDU-TR Automotive light sensor Datasheet

LX1973A
®
TM
Automotive Light Sensor
P RODUCTION D ATA S HEET
KEY FEATURES
DESCRIPTION
ƒ Nearly Perfect Best Eye™
Human Eye Spectral Response
ƒ 25C Dark Current <0.005 lux
ƒ 5 Decades Compressed Output
ƒ 10% Accuracy Over
Temperature
ƒ Scalable Output Voltage
ƒ 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
ƒ Auto headlamp control
ƒ 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
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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
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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
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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
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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
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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
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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
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