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SILICON TOUCH TECHNOLOGY INC

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16-bit Constant Current LED Driver with Error Detection

Version:A.001

Page 18

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DM137

Outputs Delay

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

this effect, DM137 is designed to have a constant unit of delay (around 2ns) between outputs. The

delay for every output goes like this: there is no delay for OUT15 and OUT7, 1 unit of delay for

OUT14 and OUT6, 2 units of delay for OUT13 and OUT5 and so on.

Global Brightness Control

DM137 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: