AS1109 8-Bit LED Drivers

By ams 71

AS1109 8-Bit LED Drivers

The ams AS1109 is designed to drive up to 8 LEDs through a fast serial interface and features eight constant-current output drivers and an on-chip diagnostic read-back function. The high clock-frequency (up to 50 MHz), adjustable output current, and flexible serial interface make the device perfectly suited for high-volume transmission applications. Output current is adjustable (up to 100 mA/channel) using an external resistor (REXT). The serial interface with Schmitt trigger inputs includes an integrated shift register. Additionally, an internal data register stores the currently displayed data.

The device features integrated diagnostics for overtemperature, open-LED, and shorted-LED conditions. Integrated registers store global fault status information during load, as well as the detailed temperature/open-LED/shorted-LED diagnostics results.

The AS1109 also features a low-current diagnostic mode to minimize display flicker during fault testing. With an operating temperature range from -40°C to +125°C, the AS1109 is ideal for industrial applications. The AS1109 is available in a 16-pin SOIC-150, a 16-pin QFN (4 mm x 4 mm), and the 16-pin QSOP-150 packages.

Features and Benefits
  • Eight constant-current output channels
  • Excellent output current accuracy
  • Output current per channel: 0.5 to 100 mA
  • Controlled in-rush current
  • Overtemperature, open-LED, shorted-LED diagnostics functions
  • Low current test mode
  • Global fault monitoring
  • Low shutdown mode current: 3 µA
  • Fast serial interface: up to 50 MHz
  • Cascaded configuration
  • Fast output drivers suitable for PWM
  • Fixed- or slow-rolling displays using static or multiplexed LED matrix and dimming functions
  • Large LED matrix displays
  • Mixed LED display and switch monitoring
  • Displays in elevators
  • Public transports (underground, trains, buses, taxis, airplanes)
  • Large displays in stadiums and public areas
  • Price indicators in retail stores
  • Promotional panels
  • Bar-graph displays
  • Industrial controller displays
  • White good panels
  • Emergency light indicators
  • Traffic signs

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