DM164 datasheet(24/30 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 23

c.3 IWAVE=”L” and Less than 11-bit PWM application

When the DM164 operates at n-bit PWM grayscale application and IWAVE is set to ”L”

(where n is less than 11). Users must add k-bit dummy data into the 16-bit GD mode data

of each channel (where k = 16-n). The 16-bit GD mode data format of each channel is

showed below:

Data

[n-1]

PWM

MSB

‧‧‧

Data

[1]

Data

[0]

Data

[n-2]

PWM

MSB-1

PWM

LSB

PWM

LSB+1

n-bit

5-bit

16-bit

n-bit PWM Data

5 bits Dummy Data

‧‧‧

(k-5)-bit

(k-5) bits Dummy Data

The 5 bits LSB and (k-5) bits MSB of 16-bit GD mode data of each channel must be filled

with all “0” ( k=16-n & k > 5).

For example:

When the DM164 operates at 10-bit PWM grayscale application and IWAVE=”L”, the 5-bit

LSB and 1-bit MSB of the 16-bit GD mode data must be filled with “0”. The 16-bit data

format is showed below:

Data

[9]

PWM

MSB

‧‧‧

Data

[1]

Data

[0]

Data

[8]

PWM

MSB-1

PWM

LSB

PWM

LSB+1

10-bit

16-bit

10-bit PWM Data

‧‧‧

5-bit

5 bits Dummy Data

1 bit

1-bit

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