Advanced Imaging


Industry News

Updated: August 6th, 2008 09:56 AM CDT

Toshiba Announces New Photo-IC Ambient Light Sensor for Consumer Electronics and Computer Displays

via PRNewswire

IRVINE, Calif. , Aug. 5 /PRNewswire/ -- Today, Toshiba America Electronic Components, Inc. (TAEC)* introduced the TPS859, a new ultra-compact device, to its family of photo-IC ambient light sensors (ALS). Developed by Toshiba Corp. (Toshiba) the new photo-IC sensor incorporates a photodiode, a current amplifier and a luminous-efficiency correction (LEC) function in a single chip that is ideal for use in flat panel displays and various home appliances, and is also suitable for use in cell phones, notebook PCs, PDAs, camcorders, digital cameras, and other equipment requiring luminosity adjustment. The sensor can be used to turn a keypad or LCD backlight on or off, or adjust the brightness according to the ambient light condition.

The TPS859 provides ultra-high sensitivity with light current (IL) of 230microA(1) compared with 40microA(1) in the previous generation TPS852 -- an almost 6x improvement. The device also employs a new optical filtering technology which achieves luminous efficiency near to that of the human eye. The filter is able to reduce the ratio of incandescent to fluorescent light sensitivity (IL) from 1.2 (typ.) in the TPS852 to 1.0 (typ.) for the TPS859. The combination of the 16 percent improvement in the sensitivity ratio and the six-fold increase in sensitivity makes TPS859 the most robust device in the Toshiba ALS product line.

"The ultra-compact surface-mount package expands the potential applications for the TPS859, which could range from large applications such as flat panel displays and various home appliances to small applications including cell phones and digital cameras," explains Roger Shih , business development engineer for the optoelectronics group at TAEC. "In addition, the new filtering technology and the lower operating voltage improve both the sensitivity and the power saving capabilities of the component."

With excellent output linearity across various light sources, Toshiba's RoHS-compatible(2) TPS859 photo-IC ALS features an ultra-compact surface-mount package that measures 1.6 x 1.6 x 0.55 mm. The TPS859 can operate from 1.8V to 5.5V, which makes it ideal for battery-powered applications.

TPS859 - Absolute Maximum Ratings (Ta = 25 degrees C) Characteristics Symbol Rating Supply Voltage VCC -0.5 to 6 V Operating Temperature Topr -30 to 85 degrees C TPS859 - Technical Specifications Characteristics Value Condition Peak Sensitivity Wavelength 550 nm ^P (typ.) VCC=3V, EV=100lx Light Current IL(1) Typical: 230 microA (using CIE standard A light) Min.: 160 microA VCC=3V, EV=100lx Light Current IL(2) Typical: 230 microA (using F10 fluorescent Max: 320 microA light) Light Current Ratio IL(1)/IL(2) 1.0 VCC=3V, EV=100lx Dark Current ILEAK (max) 0.2 microA VCC=3V, EV = 0lx Package 6-Pin SMD 1.6 mm x 1.6 mm x 0.55mm

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