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Low Power, <100 Lux Optimized, Analog Output
Ambient Light Sensor
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
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 AEC-Q100.
• 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 Ld ODFN: 2mmx2.1mmx0.7mm
• Pb-free (RoHS compliant)
• AEC-Q100 Qualified
• Display backlight control - central info display and
• Anti-glare mirror systems - specified to operate behind Bezel
OUTPUT CURRENT a LIGHT INTENSITY
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM
April 20, 2015
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 LLC 2011, 2013, 2015. 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.
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Analog Output Ambient Light Sensor
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