DM164 SITI [Silicon Touch Technology Inc.], DM164 Datasheet - Page 18

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

Maximum Output Current
The maximum output current is set by an external resistor. The resistor is connected
between Rext and GND. Varying the resistor value can adjust the current scale ranging
from 5mA to 90mA. The reference voltage of REXT terminal (Vrext) is approximately
1.23V. The maximum output current (I
equation:
where:
Vrext = 1.23V
Rrext = external resistor.
Global Brightness Control
The global brightness control function can adjust the global current of each color
independently. The output current (I
((1/256)*100)% to 100% of the maximum output current. The following equation can
calculate the global brightness control current (I
where:
I
GB = the global brightness control value for different colors.
COUNTER
max
(ONEST=H)
(ONEST=L)
16-bit
MSEL
DCK
GCK
IOUT0
IOUT0
LTH
= the maximum output current.
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
D&G Mode Data
Input Cycle
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
FFh
FF
0
1
Data Input Cycle
1st GD Mode
Figure 10. Grayscale PWM Operation
?
384
FFh
FF
0
I
. . .
I
global
max
< 65536 GCK cycle
1
Data Input Cycle
max
2nd GD Mode
≅
≅
) value can be calculated roughly by the following
global
V
R
GB+1
256
rext
rext
) can be adjusted in 256 steps from
?
global
FFFFh
(Ω)
(V)
×
)
I
×
max
64
0
65536 GCK cycle
Version:A.002
1 GCK cycle
FFh
FF
0
65536 GCK cycle
1 GCK cycle
DM164
Page 17
FFh
FF
0