high performance needs great design. Datasheet: AS1109 8-Bit LED Driver with Diagnostics Please be patient while we update our brand image as austriamicrosystems and TAOS are now ams. www.ams.com AS1109 Constant-Current, 8-Bit LED Driver with Diagnostics 1 General Description 2 Key Features 8 Constant-Current Output Channels The AS1109 is designed to drive up to 8 LEDs through a fast serial interface and features 8 output constant current drivers and an on- Excellent Output Current Accuracy chip diagnostic read-back function. - Between Channels: 2% The high clock-frequency (up to 50MHz), adjustable output current, - Between AS1109 Devices: 2% and flexible serial interface makes the device perfectly suited for high-volume transmission applications. Output Current Per Channel: 0.5 to 100mA Output current is adjustable (up to 100mA/channel) using an external Controlled In-Rush Current resistor (REXT). Over-Temperature, Open-LED, Shorted-LED The serial interface with Schmitt trigger inputs includes an integrated Diagnostics Functions shift register. Additionally, an internal data register stores the currently displayed data. Low-Current Test Mode The device features integrated diagnostics for over- Global Fault Monitoring temperature, open-LED, and shorted-LED conditions. Integrated registers store global fault status information during load as well as Low Shutdown Mode Current: 3A the detailed temperature/open-LED/shorted-LED diagnostics results. Fast Serial Interface: up to 50MHz The AS1109 also features a low-current diagnostic mode to minimize display flicker during fault testing. Cascaded Configuration With an operating temperature range from -40 to +125C the Fast Output Drivers Suitable for PWM AS1109 is also ideal for industrial applications. 16-pin SOIC-150, 16-pin QFN (4x4mm) and 16-pin QSOP-150 The AS1109 is available in a 16-pin SOIC-150, a 16-pin QFN Package (4x4mm) and the 16-pin QSOP-150 package. 3 Applications The device is ideal for 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, etc.), 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 Figure 1. Main Diagram and Pin Assignments indicators, and traffic signs. +VLED GND 1 16 VDD SDI 2 15 REXT OUTN0 OUTN1 OUTN2 OUTN3 OUTN4 OUTN5 OUTN6 OUTN7 CLK 3 14 SDO LD 4 13 OEN AS1109 AS1109 SDI SDO OUTN0 OUTN7 5 12 OUTN1 6 11 OUTN6 OUTN2 7 10 OUTN5 CLK LD OEN REXT VDD GND OUTN3 8 9 OUTN4 www.ams.com/LED-Driver-ICs/AS1109 Revision 1.21 1 - 24