DM164 datasheet(17/30 Pages) SITI

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點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC.

DM164

8x3-CHANNEL CONSTANT CURRENT LED DRIVERS

Version:A.002

Page 16

One-Shot Option

The DM164 provides an option that users can make the output turn on for just a PWM

cycle time, i.e. in the GD mode, after a LTH signal, the output only turn on for 65536 TGCK

time. After 65536 TGCK, the output will automatically turn off. This is called One-Shot

function. Figure 9 shows the difference between One-Shot or not. When ONEST = H,

one-shot function is enabled. The output will just turn on at 1st PWM cycle. When ONEST =

L, one-shot function is disabled. The output will repeat at every PWM cycle.

DCKPH

MSEL

DIN

GD[383]

DCK

LTH

GD mode

384

GCK

Internal

counter

65535

IOUT0

(ONEST=H)

IOUT0

(ONEST=L)

1st PWM cycle

2nd PWM cycle

GND

65535

3rd PWM cycle

GD[0]

Figure 9. One-Shot Operation

Grayscale PWM Operation

When DCKPH=L, the grayscale PWM cycle starts with the falling edge of LTH (see Figure

10). A LTH = H signal will set the 16-bit PWM counter value to FFFFh. The first GCK pulse

after LTH increases the PWM counter by one and switches on all IOUT with grayscales

value not zero. Each following rising edge of GCK increases the PWM counter by one. The

DM164 compare the grayscale PWM value of each output IOUT with grayscale counter

value. If the grayscale PWM value is larger than grayscale counter value, the IOUT will

switch on.

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