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SILICON TOUCH TECHNOLOGY INC

.

新竹市科學園區展業一路9號7樓之1

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16-channel 16-bit PWM Constant Current LED Driver

Version:PRE.001

Preliminary

Page 12

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DM632B

The default mode is the Rising-Edge Mode (REM

select between REM and FEM

of latch pulses ( LAT ) when the data-input clock (DCK) kept at high level then sending one rising

edge of DCK pulses when LAT kept at high level. Then we can receive serial-out data from the

data-output signal (DAO) at falling edge of DCK after the falling edge of LAT . The option 2

shows three rising edge of LAT when DCK kept at high level then sending two rising edge of

DCK, while LAT kept high level at the same time. After the falling edge of LAT , we receive

serial-out data from DAO at rising edge of DCK (REM). Notice that when internal RESET at low

level, all the shift registers in DM632B will be cleared (Kept at Low level).

DCK

LAT

Option 2 : Timing Combination to set up

Rising-Edge Mode (REM)

RESET

(internal)

t

12 3

12

GCK

DCK

LAT

Option 1 : Timing Combination to set up

Falling-Edge Mode (FEM)

RESET

(internal)

t

12

1

GCK

X

XX

X

Auto-Reload/One-Shot Mode selection

The Auto-Reload mode (ARM) in DM632B means outputs can repeat the grayscale PWM

cycle over and over. It can decrease the data amount greatly compare to non-PWM function driver

operated in grayscale PWM application.

LAT

GCK

( internal or

external )

65536 GCK

Counter

reset

(current)

on

off

high

low

1

0

Auto-Reload Mode (ARM).

Frame Data B

65536 GCK

Frame Data B

The One-Shot Mode in DM632B means each output shows one grayscale PWM cycle

following one latch pulse. The grayscale PWM cycle starts with the falling edge of LAT signal.

The first GCK pulse after LAT increases the grayscale counter by one and switches on all outputs

with grayscale value. It makes driver synchronous control easily.

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