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DM164 Datasheet(PDF) 19 Page - Silicon Touch Technology Inc.

Part # DM164
Description  8x3-CHANNEL CONSTANT CURRENT LED DRIVER
PDF  30 Pages
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Manufacturer  SITI [Silicon Touch Technology Inc.]
Direct Link  http://www.siti.com.tw
Logo SITI - Silicon Touch Technology Inc.

DM164 Datasheet(HTML) 19 Page - Silicon Touch Technology Inc.

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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 18
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 (Idot) can be
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 (Idot)
dot
global
max
DC+1
DC+1
GB+1
I
I
I
128
128
256
≅
≅×
×
×
where:
Iglobal = the global brightness control current
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.
t
t
t
t
t
t
Traditional
(IWAVE=＂H＂)
Particular
(IWAVE=＂L＂)
(2 / 65536)*100% Luminance
t
t
‧‧
‧
‧
‧
‧
‧
‧
‧
t
t
IOUT = 64 GCK cycle
‧‧‧
IOUT = 32 GCK cycle
IOUT = 4 GCK cycle
IOUT = 2 GCK cycle
(4 / 65536)*100% Luminance
(8 / 65536)*100% Luminance
(32 / 65536)*100% Luminance
(64 / 65536)*100% Luminance
Traditional
(IWAVE=＂H＂)
Particular
(IWAVE=＂L＂)
Traditional
(IWAVE=＂H＂)
Particular
(IWAVE=＂L＂)
Traditional
(IWAVE=＂H＂)
Particular
(IWAVE=＂L＂)
Traditional
(IWAVE=＂H＂)
Particular
(IWAVE=＂L＂)
IOUT = 8 GCK cycle
Figure 11. Average Separate IOUT Waveform



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