Austria launch 8 channel has the error diagnosis function of constant current LED driver

Austria Microelectronics Corporation (austriamicrosystems) recently launched 8 channel constant current LED driver AS1109. The driver is designed for open circuit and short circuit LED design, with advanced error diagnosis function. AS1109 uses serial data input / output lines for error message reading without the use of additional PCB circuit boards for diagnosing LED errors. Walter Moshammer, director of the standard linear division of Austria microelectronics company, said: with the increase in LED display resolution, the market needs to be more precise, packaging smaller LED drive. In addition, LED detection is becoming more and more important for applications such as security related traffic signs, and more commercial applications such as information display or video wall, which need to optimize maintenance costs. AS1109 uses a small package, can provide superior performance, first-class precision and unique LED error detection capabilities, to meet the current market demand. "The AS1109 has 8 regulated current ports that provide constant current to drive LED over a wide range of forward voltage variations. AS1109 output port can withstand voltage of up to 15V. Through an external resistor, the current can be adjusted in the range of 0.5 to 100mA, which provides great flexibility for LED brightness control. The transmission accuracy between AS1109 channel and IC is as high as 2%, and the intensity difference between LED and LED module has basically disappeared, which can further improve the quality of LED display screen. Another feature of AS1109 is the built-in LED error detection function. This feature is simple and intuitive, and can be operated even when the driver is working, without switching to an independent detection mode. This makes the software interface easier to use, the detection is also very fast. AS1109 can detect any open circuit, short circuit and overheating. In order to quickly and accurately detect these errors, you can use the serial data output. In addition, the specific location of the LED damage can be read from the detailed error report. In order to prevent the occurrence of LED display flashes during error detection, Austria microelectronics has also launched a unique low current diagnostic mode. In this mode, the display will use only 0.6mA of the test current in a short time. Therefore, the LED test is not obvious, you can use the function in the normal operation of the driver. 30MHz serial interface to ensure high refresh rate, even for large LED display module is also true. AS1109 applies to -40 C to +85 DEG C temperature between the working environment, is the ideal choice for industrial and outdoor applications. The device uses 16 pin SOIC-150, SSOP-150 and a small, 16 pin QFN (4x4mm) package, the pixel spacing is very small, very suitable for indoor LED display.