參數(shù)資料
型號(hào)： LP5526TLX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 顯示驅(qū)動(dòng)器
英文描述： 4 Mbit Uniform Sector, Serial Flash Memory
中文描述： LED DISPLAY DRIVER, PBGA25
封裝： 2.54 X 2.54 MM, 0.60 MM HEIGHT, 0.50 MM PITCH, BGA-25
文件頁(yè)數(shù)： 13/33頁(yè)
文件大?。?/td> 1150K
代理商： LP5526TLX
Functionality of Color LED Outputs (RLED, GLED, BLED)
(Continued)
Overlapping Mode
In overlapping mode the brightness is controlled using PWM
duty cycle based control method as the following figure
shows.
20179787
Overlapping Mode
Since RGB outputs are on simuneltaneously, the maximum
load peak current is:
I
MAX
= I(RLED)
MAX
+ I(GLED)
MAX
+ I(BLED)
MAX
Non-Overlapping Mode
The timing diagram shows the splitted R, G and B and
brightness control effect to splitted parts. Full brightness is
used in the diagram. If for example
1
2
brightness is used, the
frame is still 50μs, but all LED outputs’ ON time is 50%
shorter and at the last 25μs all LED outputs are OFF.
20179788
Non-Overlapping Mode
The non-overlapping mode has 16 programmed colors (dif-
ferent R, G and B ratio -
>
different color). Since the R, G and
B are split in to non-overlapping slots the output current
through the RGB LED can be calculated with following equa-
tion:
I
AVG
=(C
R
xI
R
+C
G
xI
G
+C
B
xI
B
)xB
where
C = Color [%] (see table of color control)
B = Brightness [%] (see table of brightness control)
2. LED ON/OFF CONTROL WITH RGB CONTROL
REGISTER
Each LED output can be set ON by writing the corresponding
bit high in the Control register (00H). RSW controls RLED,
GSW controls GLED and BSW controls BLED output. Note
that EN_RGB bit must be high and RGB_PWM bit low. In this
mode, the RGB register (01H) does not have any effect.
CC_SW bit in Control register defines the LED output mode.
L
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13
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