Intersil ISL76671 Low power, <100 lux optimized, analog output ambient light sensor Datasheet

Low Power, <100 Lux Optimized, Analog Output
Ambient Light Sensor
ISL76671
The ISL76671 is a low cost, light-to-voltage silicon optical sensor
combining a photodiode array, a non-linear current amplifier and
a micro-power op amp on a single monolithic IC. Similar to the
human eye, the photodiode array has peak sensitivity at 550nm
and spans the wavelength range 400nm to 600nm, rejecting UV
and IR light. The input luminance range is from 0.01 lux to 100
lux.
Features
• Square Root Voltage Output
• 0.01 lux to 100 lux Range
• 1.8V to 3V Supply Range
• Close to Human Eye Spectral Response
• Fast Response Time
The integrated non-linear current amplifier boosts and converts
the photodiode signal into a square root output format, extending
dynamic range while maintaining excellent sensitivity in dimly lit
conditions. As such, the part is ideal for measuring incident
daylight when mounted behind heavily smoked bezels used
around displays or behind mirrors.
• Internal Temperature Compensation
The device consumes minimum power. A dark current
compensation circuit minimizes the effect of temperature
dependent leakage currents in the absence of light, improving
the light sensitivity at low lux levels. The output gain has been
optimized to require a relatively low value external bias resistor
that falls within recommended automotive EMI limits. The
built-in 1µA op amp gives the ISL76671 an output voltage driving
advantage for heavier loads that can drive an ADC directly.
• Pb-Free (RoHS Compliant)
The ISL76671 is housed in an ultra compact 2mmx2.1mm ODFN
plastic surface mount package. Operation is rated from -40°C to
+105°C, Grade 2 per AECQ100.
• Good IR Rejection
• Low Supply Current
• Operating Temperature Range -40°C to +105°C
• 6 Lead ODFN: 2mmx2.1mmx0.7mm
• AECQ100 Qualified
Applications
• Display Backlight Control - Central Info Display &
Instrumentation
• Anti-glare Mirror Systems - Specified to Operate Behind Bezel
Mounting
VDD
1
VOUT
LIGHT DATA
PROCESS
GND
2
CURRENT
AMPLIFIER
OUTPUT CURRENT a √LIGHT INTENSITY
+
6
PHOTODIODE
ARRAY
4 REXT
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM
December 12, 2011
FN7716.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
ISL76671
Pin Configuration
ISL76671
(6 LD ODFN)
TOP VIEW
6 VOUT
VDD 1
GND 2
PAD
NC 3
5 NC
4 REXT
Pin Descriptions
PIN NUMBER
PIN NAME
PIN DESCRIPTION
1
VDD
Voltage Supply (1.8V to 3V).
2
GND
Ground
3, 5
NC
4
REXT
Connected to an external resistor to GND, setting the light-to-voltage scaling constant.
A REXT value of 100kΩ is recommended.
6
VOUT
Voltage Output.
-
PAD
Thermal Pad. The thermal pad can be connected to GND or electrically isolated.
No connect
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
ISL76671AROZ-T7
PACKAGE
(Pb-Free)
6 Ld ODFN (Tape and Reel)
PKG.
DWG. #
L6.2X2.1
NOTES:
1. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu plate
-e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL76671. For more information on MSL please see techbrief TB477.
2
FN7716.1
December 12, 2011
ISL76671
Absolute Maximum Ratings (TA = +25°C)
Thermal Information
Supply Voltage Between VDD and GND . . . . . . . . . . . . . . . . . . . . . . . . . .3.6V
REXT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (-0.5V + GND) to (0.5V + VDD)
VOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (-0.5V + GND) to (0.5V + VDD)
VOUT Short Circuit Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <10mA
ESD Rating
Human Body Model (Tested per JESD22-A114E) . . . . . . . . . . . . . . . . 3kV
Machine Model (Tested per JESD22-A115C) . . . . . . . . . . . . . . . . . . 300V
Charged Device Model (Tested per JESD22-C101E). . . . . . . . . . . . . . 1kV
Latch Up (Tested per JESD78C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA
Thermal Resistance (Typical)
θJA (°C/W) θJC (°C/W)
6 Ld ODFN (Notes 4, 5) . . . . . . . . . . . . . . . .
88
7.94
Maximum Die Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+105°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +105°C
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +105°C
Pb-Free Reflow Profile (*) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB477
*Peak temperature during solder reflow +260°C max
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
5. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications Unless otherwise noted, all parameter limits are established over the recommended operating
conditions: VDD = 3V, TA = -40°C to +105°C, REXT = 100kΩ, no load at VOUT, and green LED light. (Typical values are at TA = +25°C). Boldface limits
apply over the operating temperature range, -40°C to +105°C.
PARAMETER
E
DESCRIPTION
CONDITION
MIN
(Note 6)
Range of Input Light Intensity for Square
Root Relationship to be Held
VDD
Operating Supply Voltage
IDD
Supply Current
TYP
0.01 - 100
1.8
E = 0 lux, -40°C to 60°C
0.7
E = 0 lux, -40°C to 105°C
VOUT
Light-to-Voltage Accuracy
Voltage Output in the Absence of Light
Output Voltage Variation Over Three Light
Sources: Fluorescent, Incandescent and
Halogen
PSRR
Power Supply Rejection Ratio
VO-CMPL
Maximum Output Compliance Voltage at
95% of Nominal Output
VO-MAX
Maximum Output Voltage Swing
Lux
3
V
2
µA
5
µA
35
µA
23
E = 10 lux
0.65
V
E = 50 lux
1.35
V
E = 0 lux, -40°C to 60°C
1.4
1.85
0.95
E = 0 lux, -40°C to 105°C
ΔVOUT
UNIT
E = 100 lux
E = 100 lux
VDARK
MAX
(Note 6)
E = 100 lux
2.3
V
20
mV
120
mV
10
%
0.12
mV/V
VDD - 0.7V
V
VDD
V
tR
Rise Time
E = 0 lux to 100 lux
95
µs
tF
Fall Time
E = 100 lux to 0 lux
155
µs
tD
Delay Time for Rising Edge
E = 0 lux to 100 lux
350
µs
tS
Delay Time for Falling Edge
E = 100 lux to 0 lux
250
µs
ISC
Short Circuit Current of Op Amp
±12
mA
SR
Slew Rate of Op Amp
13
V/ms
VOS
Offset Voltage of Op Amp
±0.9
mV
NOTE:
6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
3
FN7716.1
December 12, 2011
ISL76671
POWER SUPPLY
OR
SOURCE METER
INPUT
LIGHT
VDD
10%
ISL76671
FUNCTION
GENERATOR
90%
tR
tS
90%
VOUT
10%
tF%
OUTPUT
REXT
tD
FIGURE 2. TEST CIRCUIT FOR RISE/FALL TIME MEASUREMENT
FIGURE 3. TIMING DIAGRAM
Typical Performance Curves VDD = 3V, TA = +25°C, REXT = 100kΩ, no load at VOUT, green LED light, unless
otherwise specified.
1.0
HUMAN EYE RESPONSE
0.9
1.0
0.8
0.6
LIGHT SENSOR RESPONSE
0.4
0.2
0.0
-0.2
300
400
600
800
1.0k
FLUORESCENT
0.8
NORMALIZED INTENSITY
NORMALIZED RESPONSE
1.2
0.7
0.6
HALOGEN
0.5
INCAND.
SUN
0.4
0.3
0.2
0.1
0
350
1.1k
550
750
950
WAVELENGTH (nm)
WAVELENGTH (nm)
FIGURE 4. SPECTRAL RESPONSE
FIGURE 5. SPECTRUM OF FOUR LIGHT SOURCES NORMALIZED
BY LUMINOUS INTENSITY (LUX)
3.25
RADIATION PATTERN
20°
10°
0°
10°
20°
2.85
2.65
30°
40°
VDD (V)
LUMINOSITY
30°
ANGLE 40°
3.05
50°
50°
60°
60°
70°
70°
2.45
2.05
1.85
1.65
80°
80°
90°
0.2 0.4
0.6 0.8
RELATIVE SENSITIVITY
FIGURE 6. RADIATION PATTERN
4
90°
1.0
VOUT + 0.7V
2.25
LOW LUX LIMIT
1.45
1.25
0.00001 0.0001 0.001 0.01
0.1
1
10
100
1000
LUX
FIGURE 7. VDD OPERATING RANGE (WHITE LED)
FN7716.1
December 12, 2011
ISL76671
Typical Performance Curves VDD = 3V, TA = +25°C, REXT = 100kΩ, no load at VOUT, green LED light, unless
2.0
0.45
1.8
0.40
1.6
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
otherwise specified.
1.4
1.2
1.0
0.8
0.6
0.4
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.2
0
0.01
0.1
1
10
100
0
0.001
1000
0.01
120
3.0
100
2.5
80
60
40
20
-40
-20
0
20
40
60
80
100
1.5
1.0
0.5
0
-60
120
-40
10 LUX
SUPPLY CURRENT (µA)
NORMALIZED OUTPUT VOLTAGE
7.80
0.999
0.997
50 LUX
2.0
2.2
2.4
2.6
2.8
3.0
3.2
SUPPLY VOLTAGE (V)
FIGURE 12. NORMALIZED OUTPUT VOLTAGE vs SUPPLY VOLTAGE
5
0
20
40
60
80
100
120
FIGURE 11. SUPPLY CURRENT vS TEMPERATURE AT 0 LUX
1.001
1.8
-20
TEMPERATURE (° C )
FIGURE 10. OUTPUT VOLTAGE vs TEMPERATURE AT 0 LUX
0.993
10
2.0
TEMPERATURE ( °C )
0.995
1.0
FIGURE 9. OUTPUT VOLTAGE vs LIGHT INTENSITY 0.01 LUX TO
5 LUX
SUPPLY CURRENT (µA)
OUTPUT VOLTAGE (mV)
FIGURE 8. OUTPUT VOLTAGE vs LIGHT INTENSITY 0.1 LUX TO
100 LUX
0
-60
0.1
LIGHT INTENSITY (LUX)
LIGHT INTENSITY (LUX)
10 LUX
7.78
7.76
7.74
7.72
7.70
7.68
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
SUPPLY VOLTAGE (V)
FIGURE 13. SUPPLY CURRENT vs SUPPLY VOLTAGE
FN7716.1
December 12, 2011
ISL76671
Typical Performance Curves VDD = 3V, TA = +25°C, REXT = 100kΩ, no load at VOUT, green LED light, unless
otherwise specified.
16.95
23.50
16.90
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
50 LUX
16.85
16.80
16.75
16.70
16.65
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
100 LUX
23.45
23.40
23.35
23.30
23.25
23.20
2.2
2.4
SUPPLY VOLTAGE (V)
FIGURE 14. SUPPLY CURRENT vs SUPPLY VOLTAGE
3.0
3.2
30
1.05
SUPPLY CURRENT (µA)
NORMALIZED OUTPUT VOLTAGE
2.8
FIGURE 15. SUPPLY CURRENT vs SUPPLY VOLTAGE
1.10
10 LUX
1.00
100
50 LUX
LUX
0.95
0.90
0.85
-60
2.6
SUPPLY VOLTAGE (V)
50 LUX
-40
-20
0
20
40
60
80
100
120
25
20
100 LUX
15
10 LUX
10
50 LUX
5
0
-60
-40
-20
FIGURE 16. NORMALIZED OUTPUT VOLTAGE vs TEMPERATURE
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (° C )
FIGURE 17. SUPPLY CURRENT vs TEMPERATURE
FREQUENCY = 100Hz
FREQUENCY = 100Hz
ISL76671 OUTPUT (V)
LIGHT SOURCE
LIGHT SOURCE
ISL76671 OUTPUT (V)
100µs/DIV
100µs/DIV
FIGURE 18. DELAY TIME vs LUX CHANGE FROM 0 LUX
FIGURE 19. DELAY TIME vs LUX CHANGE TO 0 LUX
6
FN7716.1
December 12, 2011
ISL76671
Application Information
Optical Sensor Location Outline
Light-to-Voltage Conversion
The green area in Figure 20 shows the optical sensor location
outline of ISL76671. Along the pinout direction, the center line
(CL) of the sensor coincides with that of the packaging. The
sensor width in this direction is 0.39mm. Perpendicular to the
pinout direction, the CL of the sensor has an 0.19mm offset from
the CL of packaging away from pin 1. The sensor width in this
direction is 0.46mm.
The ISL76671 has responsiveness that is a square-root function
of the light intensity intercepted by the photodiode in lux.
Because the photodiode has a responsivity that resembles the
human eye, conversion rate is independent of the light source
(fluorescent light, incandescent light or direct sunlight).
18μA
V OUT = ----------------------- E × R EXT
100lux
(EQ. 1)
In Equation 1, VOUT is the output voltage, E is the light intensity
and REXT is the value of the external resistor. The REXT is used to
set the light-to-voltage scaling constant. The compliance of the
ISL76671's output circuit may result in premature saturation
when an excessively large REXT is used. A REXT value of 100kΩ is
recommended for automotive applications. The output
compliance voltage is 700mV below the supply voltage as listed
in VO-MAX of the “Electrical Specifications” table on page 3.
2.00mm
SENSOR OFFSET
2.10mm
0.46mm
0.19mm
0.39mm
FIGURE 20. 6 LD ODFN SENSOR LOCATION OUTLINE
7
FN7716.1
December 12, 2011
ISL76671
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make
sure you have the latest revision.
DATE
REVISION
December 12, 2011
FN7716.1
CHANGE
“Thermal Information” on page 3, changed from:
Pb-Free Reflow Profile (*) ...... see TB487
*Peak temperature during solder reflow +235°C max
To
Pb-Free Reflow Profile (*) ...... see TB477
*Peak temperature during solder reflow +260°C max
“Electrical Specifications” on page 3:
Added Min value of 1.4V and Max value of 2.3V for VOUT where e = 100 lux
October 19, 2011
FN7716.0
Initial Release
Products
Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products
address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks.
Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a
complete list of Intersil product families.
For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device information page on
intersil.com: ISL76671
To report errors or suggestions for this datasheet, please go to: www.intersil.com/askourstaff
FITs are available from our website at: http://rel.intersil.com/reports/sear
For additional products, see www.intersil.com/product_tree
Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted
in the quality certifications found at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
8
FN7716.1
December 12, 2011
ISL76671
Package Outline Drawing
L6.2x2.1
6 LEAD OPTICAL DUAL FLAT NO-LEAD PLASTIC PACKAGE (ODFN)
Rev 3, 5/11
2.10
A
6
PIN #1
INDEX AREA
B
6
PIN 1
INDEX AREA
1
0.65
1.35
2.00
1.30 REF
4 6X 0.30±0.05
(4X)
0.10
0.10 M C A B
0.65
TOP VIEW
6x0.35 ± 0.05
BOTTOM VIEW
2.50
PACKAGE
OUTLINE
2.10
SEE DETAIL "X"
0.65
(4x0.65)
0.10 C
MAX 0.75
C
BASE PLANE
SEATING PLANE
0.08 C
SIDE VIEW
(1.35)
(6x0.30)
C
(6x0.20)
0 . 2 REF
5
0 . 00 MIN.
0 . 05 MAX.
(6x0.55)
TYPICAL RECOMMENDED LAND PATTERN
DETAIL "X"
NOTES:
1.
Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2.
Dimensioning and tolerancing conform to ASME Y14.5m-1994.
3.
Unless otherwise specified, tolerance : Decimal ± 0.05
4.
Dimension applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
5.
Tiebar shown (if present) is a non-functional feature.
6.
The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
9
FN7716.1
December 12, 2011
Similar pages