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AS1123B Datasheet(PDF) 2 Page - ams AG |
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AS1123B Datasheet(HTML) 2 Page - ams AG |
2 / 25 page A S 11 2 3 C o n s t a n t - C u r r e n t , 1 6 - C h a n n e l L E D D r i v e r w i t h D i a g n o s t i c s www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 1 - 24 D a t a s h e e t 1 General Description The AS1123 is designed to drive up to 16 LEDs through a fast serial interface and features 16 output constant current drivers and an on- chip diagnostic read-back function. The high clock-frequency (up to 50MHz), adjustable output current, and flexible serial interface makes the device perfectly suited for high-volume transmission applications. Output current is adjustable (up to 40mA/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 cur- rently 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 AS1123 also features a low-current diagnostic mode to minimize display flicker during fault testing. The AS1123 is available in a 24-pin QSOP and a 24-pin TQFN (4x4mm) package. Figure 1. AS1123 - Typical Application Diagram 2 Key Features 16 Constant-Current Output Channels Excellent Output Current Accuracy - Between Channels: <±3% - Between Devices: <±3% Output Current Per Channel: 0.5mA to 40mA Over-Temperature, Open-LED, Shorted-LED Diagnostic Functions Low-Current Test Mode Global Fault Monitoring Fast Serial Interface: 50MHz Cascaded Configuration Extremely Fast Output Drivers Suitable for PWM Output Delay for controlling Inrush Current (on request) 24-pin QSOP and 24-pin TQFN (4x4mm) 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 dis- plays, mixed LED display and switch monitoring, displays in eleva- tors, 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 con- troller displays, white good panels, emergency light indicators, and traffic signs. AS1123 SDI SDO CLK LD OEN REXT +VLED GND VDD |
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