The LX1972 is a low cost silicon light sensor with spectral response that closely emulates the human eye. Patented circuitry produces peak spectral response at 520nm, with IR response less than ±5%, of the peak response, above 900nm.
The photo sensor is a PIN diode array with a linear, accurate, and very repeatable current transfer function.
High gain current mirrors on the chip multiply the PIN diode photo-current to a sensitivity level that can be voltage scaled with a standard value external resistor. Output current from this simple to use two-pin device can be used directly or converted to a voltage by placing it in series with a single resistor at either of its two pins.
Dynamic range is determined by the resistors (typically in the range of 10K to 100K) and power supply values. Typically the LX1972 needs only 1.8V of headroom to operate at 1000 Lux illumination.
Internal temperature compensation allows dark current to be kept below 200nA over the full specification.
Temperature range (-40 to +85°C), providing high accuracy at low light levels. Usable ambient light conditions range is from 1 to more than 5000 Lux.
The LX1972 is optimized for controlling back lighting systems in low cost consumer products such as LCD TV, portable computers, and digital cameras.
Specifications
Near Human Eye Spectral Response.
Very Low IR Sensitivity.
Highly Accurate & Repeatable Output Current vs. Light.
The LX1972 is a low cost silicon light sensor with a PIN diode array and high gain current mirrors for reliable light sensing. It is optimized for back lighting systems in LCD televisions, portable computers, and digital cameras.
How is the output signal formed and how do I read it?
The device outputs a current that can be used directly or converted to a voltage by placing a resistor in series at either pin. The dynamic range is set by the external resistor values, typically 10K to 100K.
What is the spectral response and IR sensitivity of the device?
The spectral response approximates the human eye with a peak at 520 nm, and the IR response above 900 nm is less than 5 percent of the peak.
What are the power, temperature, and dark current specifications?
Typically the LX1972 needs only 1.8 V headroom to operate at 1000 Lux. It operates from -40 to 85 C and includes temperature compensation to keep dark current below 200 nA over the full specification.
What is the usable light range and what support is provided?
Usable ambient light range spans from 1 to more than 5000 Lux. Resources include datasheet, sample code, and tutorials to aid integration.
No reviews yet. Be the first to share your experience!
A
Admin
Welcome to the discussion thread for LX1972 Analog Light Sensor Feel free to ask questions, share tips or report issues.
The LX1972 is a low cost silicon light sensor with spectral response that closely emulates the human eye. Patented circuitry produces peak spectral response at 520nm, with IR response less than ±5%, of the peak response, above 900nm.
The photo sensor is a PIN diode array with a linear, accurate, and very repeatable current transfer function.
High gain current mirrors on the chip multiply the PIN diode photo-current to a sensitivity level that can be voltage scaled with a standard value external resistor. Output current from this simple to use two-pin device can be used directly or converted to a voltage by placing it in series with a single resistor at either of its two pins.
Dynamic range is determined by the resistors (typically in the range of 10K to 100K) and power supply values. Typically the LX1972 needs only 1.8V of headroom to operate at 1000 Lux illumination.
Internal temperature compensation allows dark current to be kept below 200nA over the full specification.
Temperature range (-40 to +85°C), providing high accuracy at low light levels. Usable ambient light conditions range is from 1 to more than 5000 Lux.
The LX1972 is optimized for controlling back lighting systems in low cost consumer products such as LCD TV, portable computers, and digital cameras.
Specifications
Near Human Eye Spectral Response.
Very Low IR Sensitivity.
Highly Accurate & Repeatable Output Current vs. Light.
The LX1972 is a low cost silicon light sensor with a PIN diode array and high gain current mirrors for reliable light sensing. It is optimized for back lighting systems in LCD televisions, portable computers, and digital cameras.
How is the output signal formed and how do I read it?
The device outputs a current that can be used directly or converted to a voltage by placing a resistor in series at either pin. The dynamic range is set by the external resistor values, typically 10K to 100K.
What is the spectral response and IR sensitivity of the device?
The spectral response approximates the human eye with a peak at 520 nm, and the IR response above 900 nm is less than 5 percent of the peak.
What are the power, temperature, and dark current specifications?
Typically the LX1972 needs only 1.8 V headroom to operate at 1000 Lux. It operates from -40 to 85 C and includes temperature compensation to keep dark current below 200 nA over the full specification.
What is the usable light range and what support is provided?
Usable ambient light range spans from 1 to more than 5000 Lux. Resources include datasheet, sample code, and tutorials to aid integration.
Reviews
No reviews yet. Be the first to share your experience!
Forum
A
Admin
Welcome to the discussion thread for LX1972 Analog Light Sensor Feel free to ask questions, share tips or report issues.
