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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 AEC-Q100.

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 Ld ODFN: 2mmx2.1mmx0.7mm

? Pb-free (RoHS compliant)

? AEC-Q100 Qualified

Applications

? Display backlight control - central info display and

instrumentation

? Anti-glare mirror systems - specified to operate behind Bezel

mounting