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AS1109 Datasheet(PDF) 1 Page - ams AG |
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AS1109 Datasheet(HTML) 1 Page - ams AG |
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1 / 26 page  AS1109 Consta nt-Current, 8-Bit LED Driver with Diagnostics Dat a Sh eet www.austriamicrosystems.com Revision 1.18 1 - 26 1 General Description The AS1109 is designed to drive up to 8 LEDs through a fast serial interface and features 8 output constant cur- rent drivers and an on-chip diagnostic read-back func- tion. The high clock-frequency (up to 50MHz), adjustable out- put current, and flexible serial interface makes the device perfectly suited for high-volume transmission applications. Output current is adjustable (up to 100mA/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 over- temperature, 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 to +125°C the AS1109 is also ideal for industrial applica- tions. The AS1109 is available in a 16-pin SOIC-150, a 16-pin QFN (4x4mm) and the 16-pin SSOP-150 package. Figure 1. Main Diagram and Pin Assignments 2 Key Features ! 8 Constant-Current Output Channels ! Excellent Output Current Accuracy - Between Channels: ±2% - Between AS1109 Devices: ±2% ! Output Current Per Channel: 0.5 to 100mA ! Controlled In-Rush Current ! Over-Temperature, Open-LED, Shorted-LED Diagnostics Functions ! Low-Current Test Mode ! Global Fault Monitoring ! Low Shutdown Mode Current: 3µA ! Fast Serial Interface: up to 50MHz ! Cascaded Configuration ! Fast Output Drivers Suitable for PWM ! 16-pin SOIC-150, 16-pin QFN (4x4mm) and 16-pin SSOP-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 pan- els, emergency light indicators, and traffic signs. AS1109 SDI SDO CLK LD OEN REXT +VLED 1 GND AS1109 16 VDD 2 SDI 3 CLK 4 LD 5 OUTN0 15 REXT 14 SDO 13 OEN 9 OUTN4 8 OUTN3 7 OUTN2 6 OUTN1 12 OUTN7 11 OUTN6 10 OUTN5 OUTN0 OUTN1 OUTN2 OUTN3 OUTN4 OUTN5 OUTN6 OUTN7 GND VDD |
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