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Optoelectronics/Displays??

LED driver offers less PCB space

Posted: 06 Oct 2011 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver? dot-matrix display? dimming control?

austriamicrosystems (AMS) has introduced its small and energy efficient driver, the AS1130, which requires only a 5mm PCB space. It also lessens the usage of external modules, and inexpensive connectors. Controlling 132 LEDs, the AS1130 driver can produce colorful effects and touches of animation at lower battery consumption.

Using a 1211 cross-plexed technique, the AS1130 LED driver is designed for dot-matrix displays in mobile phones, toys, personal electronics, non-battery powered household goods, indoor public information displays, and industrial applications such as power meters. The AS1130 drives 132 LEDs, each with an 8bit dimming control and no external resistor required. An 8bit analog current control allows fine tuning of each current source to compensate for the brightness of different colors, or to adjust the white balance on RGB LEDs. The device incorporates 36 frames of memory for small animations or for use as a buffer to reduce host processor load, saving energy and processing time. The AS1130 LED driver can also extend battery life by controlling an external power supply (e.g. charge pump), which is required when LEDs need a higher voltage than the battery can supply. This allows for continuous operation even under low battery voltage conditions.

"The AS1130 dot-matrix LED driver is designed to make driving LEDs an easier task," commented Rene Wutte, marketing manager for lighting at AMS. "It enables a large number of RGB LEDs to be driven from one IC for creative light designs while providing the highest efficiency available, an important feature for both battery- and AC-powered applications. The AS1130's features simplify design and programming, optimize total cost, and allow developers to provide the lighting features required to stay ahead in this market."

In addition to the ultra-small CS-WLP-20, the AS1130 LED driver is also available in a gull-winged SSOP-28 package, allowing easier handling in applications that are less space sensitive. This makes it a suitable replacement for indoor high pixel density video walls, easily replacing up to eight 16-channel PWM LED drivers, or reducing the complexity of externally (user-designed) multiplexed systems.

Only 12 lines are required to drive all 132 LEDs. This is accomplished with AMS' multiplexing technique called cross-plexing. It reduces line count on the PCB as well as pins on the connectors, saving space and costs. Other features include control via a 1MHz I�C compatible interface, open and shorted LED error detection, and low-power shutdown current. The AS1130 LED driver operates over a temperature range of -40 to 85C and a wide 2.7V to 5.5V power supply range.

The 20-pin CS-WLP and SSOP-28 versions of the AS1130 are available now in 1000-piece quantities.





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