12-Channels Pre-programmable Constant Current LED Driver

Version:A.006

Page 12

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DM621

Command Data

COMMAND

FUNCTION

PWM [1:0]

8/10/12/14-bits PWM mode selection

PWM [1:0] = 2’b00: 8-bits PWM count

PWM [1:0] = 2’b01: 10-bits PWM count

PWM [1:0] = 2’b10: 12-bits PWM count

PWM [1:0] = 2’b11: 14-bits PWM count

FREQ [1:0]

GCK frequency division selection

FREQ [1:0] = 2’b00: GCK=CLK

FREQ [1:0] = 2’b01: GCK=CLK/2

FREQ [1:0] = 2’b10: GCK=CLK/4

FREQ [1:0] = 2’b11: GCK=CLK/8

OSC

GCK source selection

OSC =1’b0: Internal oscillator (12MHz)

OSC =1’b1: External DCK signal

POLAR

Inverse PWM data selection

POLAR =1’b0: Normal PWM signal

POLAR =1’b1: Inverse PWM signal

DEC [1:0]

Command Data Error Code (avoid interference)

DEC [1:0] =2’b11: Command data is enable

DEC [1:0] =others: Command data is disable

Timing Diagram

By the combination of DCK and SIN data, DM621 could produce the internal CMD and

LATCH signal to control the system automatically.

(*Note: CMD and LATCH are both the internal control signals)

(**Note: CMD=”1”

command data mode, CMD=”0”

grayscale data mode)

Command Data:

Figure 10. The timing diagram of command data