1CAUTION: 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.
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.
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.
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.
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.
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
• Internal Temperature Compensation
• Good IR Rejection
• Low Supply Current
• Operating Temperature Range -40°C to +105°C
• 6 Lead ODFN: 2mmx2.1mmx0.7mm
• Pb-Free (RoHS Compliant)
• AECQ100 Qualified
Applications
• Display Backlight Control - Central Info Display &
Instrumentation
• Anti-glare Mirror Systems - Specified to Operate Behind Bezel
Mounting
VDD
GND
REXT
VOUT
1
2
4
6
LIGHT DATA
PROCESS
CURRENT
AMPLIFIER
OUTPUT CURRENT a √LIGHT INTENSITY
PHOTODIODE
ARRAY
+
-
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM
December 12, 2011
FN7716.1
ISL76671
2FN7716.1
December 12, 2011
Pin Configuration
ISL76671
(6 LD ODFN)
TOP VIEW
1
2
3
6
5
4
VDD
GND
NC
VOUT
NC
REXT
PAD
Pin Descriptions
PIN NUMBER PIN NAME PIN DESCRIPTION
1 VDD Voltage Supply (1.8V to 3V).
2GNDGround
3, 5 NC No connect
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.
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL76671AROZ-T7 6 Ld ODFN (Tape and Reel) 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.
ISL76671
3FN7716.1
December 12, 2011
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 DESCRIPTION CONDITION
MIN
(Note 6) TYP
MAX
(Note 6) UNIT
E Range of Input Light Intensity for Square
Root Relationship to be Held
0.01 - 100 Lux
VDD Operating Supply Voltage 1.8 3 V
IDD Supply Current E = 0 lux, -40°C to 60°C 0.7 2µA
E = 0 lux, -40°C to 105°C 5µA
E = 100 lux 23 35 µA
VOUT Light-to-Voltage Accuracy E = 10 lux 0.65 V
E = 50 lux 1.35 V
E = 100 lux 1.4 1.85 2.3 V
VDARK Voltage Output in the Absence of Light E = 0 lux, -40°C to 60°C 0.95 20 mV
E = 0 lux, -40°C to 105°C 120 mV
ΔVOUT Output Voltage Variation Over Three Light
Sources: Fluorescent, Incandescent and
Halogen
10 %
PSRR Power Supply Rejection Ratio E = 100 lux 0.12 mV/V
VO-CMPL Maximum Output Compliance Voltage at
95% of Nominal Output
VDD - 0.7V V
VO-MAX Maximum Output Voltage Swing VDD V
tRRise Time E = 0 lux to 100 lux 95 µs
tFFall Time E = 100 lux to 0 lux 155 µs
tDDelay Time for Rising Edge E = 0 lux to 100 lux 350 µs
tSDelay 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.
ISL76671
4FN7716.1
December 12, 2011
FIGURE 2. TEST CIRCUIT FOR RISE/FALL TIME MEASUREMENT FIGURE 3. TIMING DIAGRAM
ISL76671
FUNCTION
GENERATOR
VDD
REXT
VOUT
POWER SUPPLY
OR
SOURCE METER INPUT
LIGHT
OUTPUT
10% 90%
t
R
t
F
%
10%
90%
t
D
t
S
Typical Performance Curves VDD = 3V, TA = +25°C, REXT = 100kΩ, no load at VOUT, green LED light, unless
otherwise specified.
FIGURE 4. SPECTRAL RESPONSE FIGURE 5. SPECTRUM OF FOUR LIGHT SOURCES NORMALIZED
BY LUMINOUS INTENSITY (LUX)
FIGURE 6. RADIATION PATTERN FIGURE 7. VDD OPERATING RANGE (WHITE LED)
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
1.2
300 400 600 800 1.0k
WAVELENGTH (nm)
NORMALIZED RESPONSE
LIGHT SENSOR RESPONSE
HUMAN EYE RESPONSE
1.1k
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
350 550 750 950
WAVELENGTH (nm)
NORMALIZED INTENSITY
FLUORESCENT
SUN
INCAND.
HALOGEN
RADIATION PATTERN
LUMINOSITY
ANGLE
RELATIVE SENSITIVITY
90°
80°
70°
60°
50°
40°
30°
20° 10° 0° 10° 20°
30°
40°
50°
60°
70°
80°
90°
0.2 0.4 0.6 0.8 1.0
3.25
3.05
2.85
2.65
2.45
2.25
2.05
1.85
1.65
1.45
1.25 0.0001 0.001 0.01 0.1 1 10 100 10000.00001
VDD (V)
LUX
LOW LUX LIMIT
VOUT + 0.7V
ISL76671
5FN7716.1
December 12, 2011
FIGURE 8. OUTPUT VOLTAGE vs LIGHT INTENSITY 0.1 LUX TO
100 LUX
FIGURE 9. OUTPUT VOLTAGE vs LIGHT INTENSITY 0.01 LUX TO
5LUX
FIGURE 10. OUTPUT VOLTAGE vs TEMPERATURE AT 0 LUX FIGURE 11. SUPPLY CURRENT vS TEMPERATURE AT 0 LUX
FIGURE 12. NORMALIZED OUTPUT VOLTAGE vs SUPPLY VOLTAGE FIGURE 13. SUPPLY CURRENT vs SUPPLY VOLTAGE
Typical Performance Curves VDD = 3V, TA = +25°C, REXT = 100kΩ, no load at VOUT, green LED light, unless
otherwise specified.
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0.01 0.1 1 10 100 1000
LIGHT INTENSITY (LUX)
OUTPUT VOLTAGE (V)
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.001 0.01 0.1 1.0 10
LIGHT INTENSITY (LUX)
OUTPUT VOLTAGE (V)
0
20
40
60
80
100
120
-60 -40 -20 0 20 40 60 80 100 120
TEMPERATURE ( °C )
OUTPUT VOLTAGE (mV)
0
0.5
1.0
1.5
2.0
2.5
3.0
-60 -40 -20 0 20 40 60 80 100 120
TEMPERATURE (° C )
SUPPLY CURRENT (µA)
0.993
0.995
0.997
0.999
1.001
1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2
SUPPLY VOLTAGE (V)
NORMALIZED OUTPUT VOLTAGE
50 LUX50 LUX
10 LUX
7.68
7.70
7.72
7.74
7.76
7.78
7.80
1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
10 LUX
ISL76671
6FN7716.1
December 12, 2011
FIGURE 14. SUPPLY CURRENT vs SUPPLY VOLTAGE FIGURE 15. SUPPLY CURRENT vs SUPPLY VOLTAGE
FIGURE 16. NORMALIZED OUTPUT VOLTAGE vs TEMPERATURE FIGURE 17. SUPPLY CURRENT vs TEMPERATURE
FIGURE 18. DELAY TIME vs LUX CHANGE FROM 0 LUX FIGURE 19. DELAY TIME vs LUX CHANGE TO 0 LUX
Typical Performance Curves VDD = 3V, TA = +25°C, REXT = 100kΩ, no load at VOUT, green LED light, unless
otherwise specified.
16.65
16.70
16.75
16.80
16.85
16.90
16.95
1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
50 LUX
23.20
23.25
23.30
23.35
23.40
23.45
23.50
2.22.42.62.83.0
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
100 LUX
3.2
0.85
0.90
0.95
1.00
1.05
1.10
-60 -40 -20 0 20 40 60 80 100 120
TEMPERATURE (° C )
NORMALIZED OUTPUT VOLTAGE
50 LUX50 LUX
10 LUX
50 LUX100 LUX
0
5
10
15
20
25
30
-60 -40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
50 LUX50 LUX
10 LUX
100 LUX
LIGHT SOURCE
ISL76671 OUTPUT (V)
100µs/DIV
FREQUENCY = 100Hz
LIGHT SOURCE
ISL76671 OUTPUT (V)
100µs/DIV
FREQUENCY = 100Hz
ISL76671
7FN7716.1
December 12, 2011
Application Information
Light-to-Voltage Conversion
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).
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.
Optical Sensor Location Outline
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.
VOUT
18μA
100lux
-----------------------ER
EXT
×=(EQ. 1)
FIGURE 20. 6 LD ODFN SENSOR LOCATION OUTLINE
2.10mm
2.00mm
0.39mm
0.46mm
0.19mm
SENSOR OFFSET
ISL76671
8
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
FN7716.1
December 12, 2011
For additional products, see www.intersil.com/product_tree
Products
Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products
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Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a
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For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device information page on
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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 CHANGE
December 12, 2011 FN7716.1 “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
ISL76671
9FN7716.1
December 12, 2011
Package Outline Drawing
L6.2x2.1
6 LEAD OPTICAL DUAL FLAT NO-LEAD PLASTIC PACKAGE (ODFN)
Rev 3, 5/11
located within the zone indicated. The pin #1 identifier may be
Unless otherwise specified, tolerance : Decimal ± 0.05
Tiebar shown (if present) is a non-functional feature.
The configuration of the pin #1 identifier is optional, but must be
between 0.15mm and 0.30mm from the terminal tip.
Dimension applies to the metallized terminal and is measured
Dimensions in ( ) for Reference Only.
Dimensioning and tolerancing conform to ASME Y14.5m-1994.
6.
either a mold or mark feature.
3.
5.
4.
2.
Dimensions are in millimeters.1.
NOTES:
BOTTOM VIEW
DETAIL "X"
SIDE VIEW
TYPICAL RECOMMENDED LAND PATTERN
TOP VIEW
(4X) 0.10
INDEX AREA
PIN 1
A
BPIN #1
B0.10 MAC
C
SEATING PLANE
BASE PLANE
0.08
0.10
SEE DETAIL "X"
C
C
0 . 00 MIN.
0 . 05 MAX.
0 . 2 REF
C5
1
6
6
2.10
2.00
2.10
2.50
(1.35)
(6x0.30)
0.65
(6x0.55)
(6x0.20)
(4x0.65)
1.30 REF1.35
0.65
0.65
6x0.35 ± 0.05
PACKAGE
6X 0.30±0.05
INDEX AREA
OUTLINE
4
MAX 0.75
