austriamicrosystems has expanded its LED driver portfolio with the AS1116, an ultra small multiplexed LED driver. The device operates from a single 2,7 V to 5,5 V supply while requiring supply current of 0,6 mA during operation and 200 nA in shutdown mode.
The AS1116 can drive either eight 7-segment digits or 64 individual LEDs with 47 mA per digit or 5,5 mA per LED. The current can be easily adjusted by an external resistor. With an excellent accuracy of ±3%, the driver improves picture quality of LED displays since intensity variations between LEDs and LED modules are minimised. A 4-bit PWM is implemented for either global digital brightness control or separate dimming of each single digit in 16 steps.
A unique feature of the AS1116 is the built-in LED error detection. The intuitive software interface allows the feature to be easily invoked during normal operation, ensuring rapid error detection. The AS1116 can detect any open- or short-circuit within the multiplexed 8x8 LED array and a detailed error report can be read out with the exact position of the broken LED.
The AS1116 is suitable for operating environments ranging from -40°C to +85°C and requires a small external resistor and a single capacitor. Optimised for space restricted application and offering excellent thermal performance, it is available in a 0,6 mm thin TQFN (4 x 4 mm) package. For easier handling, a QSOP 24-pin package is also available.
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