DM164 SITI [Silicon Touch Technology Inc.], DM164 Datasheet - Page 11

• Manufacturer Part Number: DM164
• Description: 8x3-CHANNEL CONSTANT CURRENT LED DRIVER
• Manufacturer: SITI [Silicon Touch Technology Inc.]

Serial Data Interface
The DM164 includes a flexible data transfer interface. The data can be transferred from
DIN pin to the shift registers at either the rising edge of DCK or the falling edge of DCK
depending on the signal DCKPH. After all data are clocked in, a high level LTH signal can
transfer the serial data to the data latches (Level Sensitive). The serial data format can be
192-bit or 384-bit wide, depending on the operating mode of the device.
Operating Modes
The DM164 has two operating modes depending on the signal MSEL. Table 1 shows the
available operating modes. When MSEL = H, the device operates at the D&G mode. D&G
mode is used to set dot correction data and global brightness control data after IC power
up or any time. When MSEL = L, the device becomes GD mode. GD mode is used to set
grayscale PWM data after D&G mode.
D&G Mode Data Format
At D&G mode, dot correction data of all channels and global brightness control data of
different colors are transferred into the chip at the same time. The complete dot correction
data format consists of 24 x 7-bit and the global brightness control data of three different
colors consists of 3 x 8-bit. The total shift registers width at D&G mode is 192-bit. All data
is clocked in with MSB first. Figure 1 shows the D&G mode data format.
To operate the DM164 in D&G mode, MSEL must be set to high. The shift register width is
then set to 192-bit wide. The input data can be transferred at either the rising edge of DCK
IOUT23
MSB
191
DC6
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
MSEL
IOUT23
‧‧‧
H
L
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
IOUT23
185
DC0
IOUT22
184
DC6
Dot Correction Data & Global Brightness Control
Grayscale PWM Data Input Mode (GD mode)
IOUT22~IOUT01
Figure 1. D&G Mode Data Format (D&G[191:0])
‧‧‧
Data Input Mode (D&G mode)
IOUT01
DC0
31
Table 1. Two Operating Modes
IOUT00
DC6
30
IOUT00
‧‧‧
MODE
IOUT00
DC0
24
GB_R7
23
GLOBAL_R
‧‧‧
GB_R0
16
Version:A.002
GB_G7
15
GLOBAL_G
‧‧‧
SHIFT REGISTER
GB_G0
8
192-bit
384-bit
GB_B7
7
GLOBAL_B
‧‧‧
DM164
Page 10
GB_B0
LSB
0