DM164 SITI [Silicon Touch Technology Inc.], DM164 Datasheet - Page 19

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

Dot Correction
Besides global brightness control, the DM164 also has the capability to adjust the output
current of each channel IOUT00 to IOUT23 independently. The output current (I
adjusted in 128 steps from ((1/128)*100) % to 100% of the global brightness control
current. The following equation can calculate the dot correction current (I
where:
I
DC = the dot correction value for each output.
Average Separate IOUT Waveform
The DM164 incorporates a different PWM counter, hence the IOUT waveform demonstrate
a very different characteristics compare to conventional PWM counter. In the DM164,
when IWAVE=”L,” the IOUT waveform is averagely divided into 32(maximum) sections.
Figure 11 shows the difference between traditional IOUT waveform and particular IOUT
waveform.
global
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
= the global brightness control current
(IWAVE=＂H＂)
(IWAVE=＂L＂)
(IWAVE=＂H＂)
(IWAVE=＂L＂)
(IWAVE=＂H＂)
(IWAVE=＂L＂)
(IWAVE=＂H＂)
(IWAVE=＂L＂)
(IWAVE=＂H＂)
(IWAVE=＂L＂)
Traditional
Traditional
Traditional
Traditional
Traditional
Particular
Particular
Particular
Particular
Particular
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
‧
‧
‧
IOUT = 32 GCK cycle
I
IOUT = 2 GCK cycle
dot
‧
Figure 11. Average Separate IOUT Waveform
IOUT = 4 GCK cycle
‧
IOUT = 8 GCK cycle
≅
IOUT = 64 GCK cycle
‧
DC+1
128
‧
‧
‧
×
I
global
≅
DC+1
128
×
GB+1
256
(32 / 65536)*100% Luminance
(64 / 65536)*100% Luminance
(2 / 65536)*100% Luminance
(4 / 65536)*100% Luminance
(8 / 65536)*100% Luminance
Version:A.002
×
I
‧
‧
‧
max
dot
)
dot
t
t
t
t
t
t
t
t
t
t
DM164
) can be
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