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Tiny IC powers backlight, flash and RGB functions

Posted: 21 Nov 2006 ?? ?Print Version ?Bookmark and Share

Keywords:AnalogicTech? AAT2830/31? display solution? drivers? charge pump?

AnalogTech's AAT2830/31 total display solution

AnalogicTech has rolled out a highly integrated total display solution for handsets and other portable systems operating off a single-cell Li-ion battery. By combining a high-performance charge pump with backlight, flash and RGB drivers in a single 4-by-4mm IC controllable by a serial interface, the company said its AAT2830/31 reduces parts count and system footprint, promising handset and portable system designers a high level of integration and configurability.

Built around a high-efficiency, tri-mode charge pump, the device delivers up to 600mA of current for the growing array of lighting applications in today's portable systems including main and sub-display backlighting, camera flash and RGB or auxiliary status lighting. Individual driving circuits for each function are controlled by the company's patented, single wire AS?Cwire serial digital interface.

As handset and portable system designers expand their use of lighting functions to include main and sub-panel backlights, camera flash with movie-mode capability, RGB status and keypad backlighting, any discrete implementation of these subsystems conflicts directly with the need to minimize system footprint. AnalogicTech's new solution helps designers overcome many of these problems.

The AAT2830/31 drives up to six outputs programmable up to a maximum of 30mA each, settable via an external resistor, for LED backlight applications. Individual control of each channel allows designers to drive four LEDs for a main display and two for a sub panel, or all six for a single display. LED intensity can be set to any of 16 levels using the AS?Cwire serial interface.

For camera flash functions, the AAT2830/31 supplies up to 600mA of current through four individual channels programmable up to 150mA each. In addition, the device supports both flashlight and movie-mode operations. Three auxiliary outputs can be adjusted to handle up to 60mA for color RGB, keypad or status lighting applications. The high-efficiency tri-mode charge pump provides enough power to operate all three types of LED functionsbacklight, flash and RGBsimultaneously.

All settings for backlight, flash and RGB lighting are programmable via the AS?Cwire interface. Color RGB drivers on the AAT2830 can be programmed into up to 4096 color/keypad intensity settings. For portable devices using smaller-scale displays, the AAT2831 offers RGB drivers programmable to 64-color/keypad intensity combinations.

To protect the LEDs from thermal damage, the AAT2830/31 also features an integrated flash timer, which limits the maximum amount of time the LEDs can be illuminated. This unique feature also helps minimize battery drain during flash operations.

Specified over the -40C to 85C temperature range, the AAT2830/31 will be sampling in December 2006 and will be available in a Pb-free, thermally-enhanced, 24-pin QFN44 package.

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