austriamicrosystems developed the AS1110 16-channel constant current LED driver with advanced error diagnostics for open and shorted LEDs. The AS1110 uses the serial data input/output lines for the error information read-back so that no additional PCB tracks are needed for LED error diagnostics.
The AS1110 features 16 regulated ports that provide constant current for driving LEDs within a wide range of forward voltage variations. The AS1110 output ports are guaranteed to endure a maximum voltage of 15 V. Through an external resistor the currents can be adjusted from 0,5 to 100 mA which gives high flexibility in controlling LED brightness. With accuracy of ±3% between channels, the AS1110 improves picture quality of LED displays since intensity variations between LEDs and LED modules are removed.
The AS1110 can be used in multiplexed mode, meaning that a single AS1110 can drive up to 64 independent LED nodes. In this multiplexed mode the AS1110 still maintains the full functionality of the error detection.
Easy and intuitive to use, the LED error detection can be invoked during normal operation without switching into a separate detection mode. This makes the software interface user-friendly while detection can be done extremely fast. The AS1110 can detect any open- or short-circuit as well as an over-temperature occurrence. For immediate detection of those errors, a global error flag is available as serial data output, detecting any of those errors quickly and precisely. Furthermore, a detailed error report can be produced with the exact position of the broken LED.
In order to avoid the typical flickering of LED displays during error detection, austriamicrosystems has introduced the low-current diagnostic mode. In this mode, a small test current of only 0,6 mA is applied to the display for a very short time. As a result, LED testing is not visible and can therefore be applied during normal operation.
The fast 30 MHz serial interface ensures high refreshing rates even for huge LED display modules.
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