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參數(shù)資料
| 型號(hào)： | LP5526TL |
| 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 |
| 文件頁數(shù)： | 18/33頁 |
| 文件大?。?/td> | 1150K |
| 代理商： | LP5526TL |
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Functionality of Color LED
Outputs (RLED, GLED, BLED)
(Continued)
FLASH SAFETY TIMER FUNCTION
Flash safety function can be used to prevent damages due
to possible overheating when flash or RGB LEDs have been
stuck on because of software or user error. Safety function
has two operation modes:
1.
Disabling selected RGB drivers when no writing has
been done to the RGB max current register (address
02H) for 1 second
2.
Disabling selected RGB drivers if the external flash trig-
ger pulse is longer than 1 second
Flash safety function can be individually enabled for all RGB
LED drivers (EN_SAFETY_R, EN_SAFETY_G, EN_SAFE-
TY_B). The safety function operation mode depends on the
state of EN_FLASH bit.
1.
EN_FLASH = 0: Safety counter starts counting when at
least one of the EN_SAFETY_X bits is enabled. Safety
counter can be cleared by executing an I
2
C read or write
sequence to address 02H. If safety counter reaches one
second, the LEDs which have the safety function en-
abled, are switched off. Also the read-only bit SAFETY-
_SET is set high.
EN_FLASH = 1: Safety counter starts counting when the
external flash trigger pulse starts (GPIO[0]/PWM goes
high) and stops counting when flash pulse stops
(GPIO[0]/PWM goes low). If flash pulse is longer than
one second, the LEDs which have the safety function
enabled, are switched off. Also the read-only bit SAFE-
TY_SET is set high.
In both cases (EN_FLASH = 0/1) after one second is
reached and the LEDs which safety bit has been enabled are
switched off, the LED state can be restored by disabling the
safety function of the corresponding LED. Counter can be
cleared only by disabling all safety bits (EN_SAFETY_R = 0,
EN_SAFETY_G = 0, EN_SAFETY_B = 0), I
2
C read or write
sequence to address 02H does not clear the counter when
safety function has been activated.
2.
RGB LEDs Driver Performance Characteristics
Symbol
I
LEAKAGE
I
MAX(RGB)
Parameter
RLED, GLED, BLED pin leakage current
Maximum recommended sink current
Condition
Min
Typ
Max Units
1
50
60
12.5
μA
mA
mA
%
CC mode
SW mode
CC mode
CC mode
I
RGB
set to 50mA, CC mode
SW mode
Accuracy same as internal clock
frequency accuracy
+25
o
C, I
RGB
set to 50mA
-30
o
C
+85
o
C
Accuracy
@
50mA
Current mirror ratio
RGB current matching error
Switch resistance
RGB internal PMW switching frequency
5
1:100
2
3.2
20
%
kHz
R
SW
RGB
V
SAT
Saturation voltage (current drop 10%)
230
350
300
430
mV
Note:
RGB current should be limited as follows:
constant current mode
– limited by external R
RGB
resistor
switch mode
– limited by external ballast resistors
Output Current vs Pin Voltage (CC Mode)
Output Current vs R
RGB
(CC Mode)
20179705
20179706
L
www.national.com
18
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