Irvine, Calif. Microsemi Corp. says it has introduced its smallest, lowest-cost, and easiest to implement ambient light sensor to its portfolio of automatic brightness control integrated circuits. The new LX1972 doesn't require optical filters and its output current can be used directly or converted to a voltage by placing the device in series with a single resistor at either of its two pins, said the company.
How it works: The LX1972's 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 photocurrent to a level that can be voltage scaled with a standard value external resistor. The detector is temperature stable due to internal thermal compensation that allows for high accuracy at low light levels over the full specification range of -40°C to 85°C.
The new sensor is based on Microsemi's patent-pending architecture that emulates the spectral response of the human eye and largely ignores both ultraviolet and infrared wavelengths that often confuse conventional light sensors, said the company. The circuit design is optimized for controlling back-lighting displays
in portable consumer products that include digital still cameras and notebook
computers, as well as desktop monitors and LCD TVs.
Packaged in a 2-pin 1206 standard carrier that measures 3.25 mm (L) x 1.6 mm (W) and 1.0 mm (H), the LX1972 is priced at $0.60 each in quantities of 10,000. Samples and production quantities are available. Samples may be requested at the company's web site, or through Microsemi's sales representatives and distribution channel.
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