AS1109 8-Bit LED Drivers

ams' AS1109 constant-current 8-bit LED drivers with diagnostics

Image of ams as1109 8-Bit LED DriversThe 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 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
  • Over-temperature, 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


ImageManufacturer Part NumberDescriptionTypeTopologyAvailable Quantity
AS1109-BQFR datasheet linkIC LED DRIVER LINEAR 100MA 16QFNAS1109-BQFRIC LED DRIVER LINEAR 100MA 16QFNLinearShift Register1741 - Immediate
AS1109-BQFR product page link
AS1109-BSOT datasheet linkIC LED DRIVER LIN 100MA 16SOICAS1109-BSOTIC LED DRIVER LIN 100MA 16SOICLinearShift Register534 - Immediate
AS1109-BSOT product page link
AS1109-BSSU datasheet linkIC LED DRIVER LIN 100MA 16QSOPAS1109-BSSUIC LED DRIVER LIN 100MA 16QSOPLinearShift Register40 - Immediate
AS1109-BSSU product page link
AS1109-BSST datasheet linkIC LED DRIVER LIN 100MA 16QSOPAS1109-BSSTIC LED DRIVER LIN 100MA 16QSOPLinearShift Register0AS1109-BSST product page link
AS1109-BSOU datasheet linkIC LED DRIVER LIN 100MA 16SOICAS1109-BSOUIC LED DRIVER LIN 100MA 16SOICLinearShift Register0AS1109-BSOU product page link

Related Parts

ImageManufacturer Part NumberDescriptionCurrent - Output / ChannelOutputs and TypeVoltage - OutputAvailable Quantity
AS1109-QF_EK_ST datasheet linkBOARD EVAL AS1109AS1109-QF_EK_STBOARD EVAL AS1109100mA8, Non-Isolated15V0AS1109-QF_EK_ST product page link
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Published: 2013-07-02