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SILICON TOUCH TECHNOLOGY INC

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16-bit Constant Current LED Driver

Version:A.003

Page 12

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DM13A

Outputs Delay

Large in-rush currents will occur when the system activates all the outputs at once. To reduce

this effect, DM13A is designed to have a constant unit of delay (around 5ns) between outputs. The

delay sequence for every output goes like this: OUT0 (no delay)

OUT15

OUT1

OUT14

OUT2

OUT13

OUT3

OUT12

OUT4

OUT11

OUT5

OUT10

OUT6

OUT9

OUT7

OUT8 (the largest delay).

Global Brightness Control

DM13A has no built-in global brightness control feature. In order to obtain a lower resolution

of global brightness control effect, two methods could be utilized. One is providing PWM signal

synchronized on latch pulse to modulate the output enable terminal (EN pin). The other is to adjust

the Rrext value or voltage drop across the external resistor. Please see the reference circuit below: