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144-channel dot matrix LED driver claims industry's highest efficiency and smallest size

August 23, 2010 | Paul Buckley | 222901362
144-channel dot matrix LED driver claims industry's highest efficiency and smallest size austriamicrosystems has released what the company claims is the  most advanced and smallest LED dot-matrix driver (channels vs. PCB space)  available. The AS1119 drives 144 LEDs but requires only 9 mm˛ PCB space, reduces external component count, reduces connector pin count and requires fewer PCB layers.

Benefits for end users include up to 80 percent longer battery lifetime, more colorful effects and smoother running animations. The AS1119 is targeted for dot matrix displays in mobile phones, personal electronics and toys. The AS1119 leads the industry by driving the most LEDs, each with an 8-bit dimming control and no external resistor required. Additionally, an 8-bit analog current control allows fine tuning of each matrix to compensate for different brightness of different colors, or to adjust the white balance on RGB LEDs. The AS1119 incorporates 6 frames of memory for small animations or for use as a buffer to reduce host processor load, thereby saving energy and precious processing time.  The AS1119 also extends battery life by including an on-chip 320 mA charge pump  which is required when LEDs require a higher voltage than the battery can  supply, allowing continuous operation even under low battery voltage  conditions.     

Other features include control via a 1 MHz I²C compatible interface, open and shorted LED error detection, and low-power shutdown current.  Two modes of operation are offered making the AS1119 a very flexible part to  design with - single/bicolor mode to drive the maximum number of LEDs in two  8x9 matrix, or the RGB mode offering three times 5x6 matrix, allowing white  balance by adjusting the analog current in each matrix.       

Only 18 lines are required to drive all 144 LEDs. This is accomplished with austriamicrosystems' multiplexing technique called cross-plexing. This allows reducing the line count on the PCB as well as fewer pins on the connectors, saving space and costs.The AS1119 is available  in a 36-pin WL-CSP 3x3 mm package and operates over a temperature range of -40  to +85  degrees C over a wide 2.7 to 5.5 V power supply range.      

Availability and Pricing     

Available in volume now, the price for the AS1119 is 5.00 US Dollars in 1000 piece quantities.  A demonstration board is available for the AS1119 LED driver.      

Related link: AS1119 dot matrix LED driver 

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