ALS-PT19 Analog Light Sensor

The LX1972 is a low cost silicon light sensor with spectral response that closely emulates the human eye.The patented circuit produces a maximum spectral response of 5% nm, less than IR with a response, maximum response, above nm.

The photographic sensor is an array of PIN diodes with a linear, precise and highly repeatable current transfer function.High-gain current mirrors on the chip multiply the photographic current of the PIN diode at a sensitivity level that can be scaled with an external resistor of standard value.The output current of this simple two-pin device can be used directly or converted to a voltage by placing it in series with a single resistor on either of its two pins.The dynamic range is determined by the resistors (normally in the range of 10 K to 100 K) and the values of the power supply.Normally, the LX1972 only needs 1.8 V of space to operate at 1000 Lux illumination.The internal temperature compensation allows the dark current to remain below zero over the full specification.Temperature range (-40 to + 85 C), providing high precision at low light levels.The range of usable ambient light conditions is from 1 to more than 5000 Lux.The LX1972 is optimized to control back lighting systems in low-cost consumer products such as LCD TVs, laptops and digital cameras.

• Spectral response of the nearby human eye.
• Very low IR sensitivity.
• Highly precise and repeatable output current compared to light.
• Scalable output voltage!
• Stable temperature
• High gain photographic amplifiers integrated.
• No optical filters are needed.

Specifications

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Datasheet

Sample Code

Tutorial