Crossplexing, also called complementary driving of LEDs, allows driving a high LED count with a minimal number of pins. This method of driving uses the natural diode behavior of a LED to block reverse current at any time as long as the voltage is below the break down voltage. When driving an LED matrix as shown on this slide, a single line will act as a sink while all others are sources. Similar to the standard multiplexing the sink is cycled through very fast, in a range of 350Hz, and the crossplexing cannot be seen by the eye. In this example the current is set to 30mA; an average LED current of 2.5mA results since each is only on for a maximum of 1/12th of the time. This means LEDs used for this system must have a peak current rating greater than 30mA and a DC current of at least 2.5mA. The average current of 2.5mA must be considered because of the self heating of the LED, the peak current limit of the LED gives the maximum current allowed even if drawn only for a short time. For both values it is necessary to stay within the limits. The AS1130 adds an 8-bit PWM to each source which means that every individual LED can be controlled with 256 steps of brightness. For analog brightness control there are two options; an 8-bit analog current control for white balance and another 8-bit global current control.