Austriamicrosystems LED driver

Austriamicrosystems has expanded its LED driver portfolio with the AS1115 user interface driver.

The device combines display driving and key scanning to provide a front panel solution that eliminates the use of secondary µP or other logics plus discrete devices.

The device can drive either eight 7-segment digits or 64 individual LEDs with 47 mA per digit or 5 mA per LED. An external resistor can adjust the current. With an accuracy of ±3%, it improves picture quality for LED displays due to minimised intensity variations between the LEDs and LED modules.

For either global digital brightness control, or separate dimming, of each single digit a 4-bit PWM is implemented. Additionally, it offers the read back of up to 16 keys completing the single chip UI solution.

A unique feature is the built-in LED error detection. Simple and intuitive to use, the software interface allows the error diagnostics to be easily accessed during normal operation. This 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 driver operates from a single 2.7 to 5.5 V supply while requiring the lowest supply current of 0.6 mA during operation and 200 nA in shutdown mode.