Product category:
Optoelectronic Sensors, Switches and Receivers
News Release from: Avago Technologies | Subject: HSDL-9001
Edited by the Electronicstalk Editorial
Team on 12 April 2004
All-analogue sensor aids frugal
backlight control
A new ambient light photosensor can increase mobile phone battery life by eliminating unnecessary backlighting at half the cost and size of its predecessor device.
A new ambient light photosensor can increase mobile phone battery life by eliminating unnecessary backlighting at half the cost and size of its predecessor device In addition to mobile phones, Agilent's ambient light photosensors are an ideal power savings solution for PDAs, notebook PCs, portable DVD players, MP3 players, camcorders and digital cameras
This article was originally published on Electronicstalk on 8 Nov 2004 at 8.00am (UK)
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Agilent's innovative ambient light photosensors emulate the human eye in detecting the amount of ambient light, then signal the mobile phone to turn on its display's backlight and keypad light if necessary.
This feature saves battery power, an increasingly important issue as popular LCD colour displays consume much more power than monochrome LCDs.
Compared with Agilent's first-generation HSDL-9000 digital-output ambient light sensor, which is supplied in a 6-pin plastic lead chip carrier, the new analogue-output HSDL-9001 is half the size at 0.6 x 2.0 x 1.5mm.
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The HSDL-9001, which contains no analogue to digital circuitry, provides greater design flexibility by allowing the signal processing and digitisation to be implemented through other means, such as the host processor.
"The lower cost and significantly smaller HSDL-9001 ambient light photosensor addresses price- and size-sensitive mobile applications", said Kee Hane Ngoh, Vice President and General Manager of Agilent's Infrared Products Division.
"The significant power savings enabled by our innovative ambient light sensor increases the battery life of handheld devices and battery-operated consumer appliances".
Agilent's ambient light sensors outperform silicon photodiode light detection solutions because their spectral response peaks at the same wavelength (550nm) as the human eye.
The sensors perform equally well with light sources ranging from natural sunlight to fluorescent, conventional incandescent and halogen lamps.
They also offer significantly faster response to changes in illumination than phototransistors.
The Agilent HSDl-9001 analogue-output light sensor detects the ambient light level and provides a highly linear proportional output that is used to adjust the backlighting of an LCD display screen or keypad.
If there is sufficient ambient light, designer-provided logic can turn off the backlighting.
Because backlighting is only necessary about 40% of the time, the ambient light sensor reduces battery recharges or replacements in portable devices.
Because the HSDL-9001 is an analogue device, it permits infinite control of the light detection threshold.
It features guaranteed performance over the 2.7 to 3.6V supply voltage range and the -25 to +85C temperature range.
The Agilent HSDL-9001 is currently available through Agilent's direct sales channel for volume orders and through Agilent's global distribution partners. Request a free brochure from Avago Technologies ...
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