Constant-Current 8-Bit LED Driver
Description
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Preliminary Product Brief
A S 11 0 9
C o n s ta n t - C u r r e n t , 8 - B i t L E D D r i v e r w i t h D i a g n o s t i c s
1 General Description
The AS1109 was designed to drive up to 8 LEDs through a fast serial interface and features 8 output constant current drivers and an on-chip diagnostic readback function.
The high clock-frequency (up to 30MHz), adjustable output 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 includes an integrated shift register with Schmitt trigger inputs allows display data to be shifted-in.
Additionally, an internal data register stores the currently displayed data.
The device features integrated diagnostics for overtemperature, open-LED, and shorted-LED conditions.
Integrated shift registers store global fault status information during load as well as the detailed temperature/ open-LED/shorted-LED diagnostics results.
2 Key Features
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8 Constant-Current Output Channels Excellent Output Current Accuracy - Between Channels: <±2% - Between AS1109 Devices: <±2%
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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: 10µA Fast Serial Interface: 30MHz Cascaded Configuration Extremely Fast Output Drivers Suitable for PWM
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The AS1109 also features a low-current diagnostic ! 16-pin SOIC-150 and 16-pin SSOP Package DataSheet4U.
com mode to minimize display flicker during fault testing.
The AS1109 is available in a 16-pin SOIC-150 package and the 16-pin SSOP 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 LE...
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