Dot Matrix LED Unit for Outdoor Use LT1442M/LT1445M(Lamp Type)
■ Features
¡No. of dots : 16✕16dots
¡Outline dimensions : 160✕160mm
¡Dot size : ø7.5mm
¡Dot pitch : 10mm
¡
Radiation color : Yellow-green+Red(High-luminosity)dichromatic type
¡Driving method : Static drive
LT1445M
■ Absolute Maximum Ratings
■ Electrical Characteristics
(Ta=25˚C)
(VCC=5V,VLED=3V,Ta=25˚C)
Parameter
Supply voltage for IC
Supply voltage for LED
Input voltage*1
Operating temperature
Storage temperature
Power dissipation
Symbol
VCC
VLED
VI
Topr
Tstg
Rating
5.5
3.5
Unit
V
V
MIN. TYP. MAX.
Parameter
Symbol
Unit
V
V
mA
A
V
VCC
VLED
ICC
ILED
VIH
VIL
IIH
4.75
2.75
------
------
3.5
------
------
------
------
5.0
3.0
220/280
9.3/11.5
------
5.25
3.25
------
------
------
1.5
Supply voltage for IC
Supply voltage for LED
IC current dissipation
LED current dissipation*1
5.5
V
-10 to +75
-20 to +100
35/49
˚C
˚C
W
Input voltage
Input current
P
------
V
*1 VI<Vcc at Vcc≤5
Each figure in the table is the one of LT1442M/LT1445M in sequence.
------
0.1
µA
mA
MHz
------
------
IIL
fCLK
0.12
3.0
Clock frequency
*1 Under the condition that dichromatic all dots are lit.
Each figure in the table is the one of LT1442M/LT1445M in sequence.
■ Optical Characteristics
(VCC=5V,VLED=3V,Ta=25˚C)
Parameter
Symbol
TYP
Unit
■ Timing Chart
Red
MIN. 800/700
MIN. 800/700
36/54
2
Luminance
LV
cd/m
Yellow-green
Viewing angle
2θ1/2
λp
˚
tsetup
thold
td(C-L)
t
WCLK
660
565
Red
CLOCK
nm
Peak emission wavelength
Yellow-green
RDATA
GDATA
Each figure in the table is the one of LT1442M/LT1445M in sequence.
LATCH
tWL
1/fENA
RENABLE
GENABLE
■ Terminal Functions
t
WENA
Symbol
Connector
Function
Supply voltage for LED(+3V)
Supply voltage for IC(+5V)
Ground
1/fOSC
VLED
VCC
GND
Power supply
(CN1)
Internal ENABLE
Display pattern
OFF
ON
OFF
RDATA
Serial data input for red(H=ON, L=OFF)
■ Block Diagram
GDATA
Serial data input for yellow-green(H=ON, L=OFF)
L: Contents of shift register is transmitted to latch
register. H: Contents are latched.
Controls ON/OFF of red LED
(L: LED ON)
Luminance
adjustment
circuit
LATCH
VR1
VR2
For yellow-green
(For red)
(
)
Input signal
(CN2) RENABLE
OSC
MONO-MULTI
Controls ON/OFF of yellow-green LED
(L: LED OFF)
Clock signal for data transmission in the shift-
register.(L/H: serial data is shifted.)
Ground for signal
Input signal generated through 256-bit shift register or buffer
Input signal generated through 256-bit shift
register or buffer
GENABLE
CN3 Output signal portion
CN2 Input signal portion
B
U
F
F
E
R
B
U
F
F
E
R
GENABLE
RENABLE
CLOCK
GENABLE
RENABLE
CLOCK
CLOCK
LATCH
GND
RDATA
LATCH
RDATA
GDATA
RDATA
GDATA
GDATA
Output signal
(CN3)
LATCH
Buffered input signal
Shift register(yellow-green)
Shift register(red)
LATCH
RENABLE Buffered input signal
GENABLE Buffered input signal
LATCH
CLOCK
GND
Buffered input signal
Ground for signal
Constant current driver
Constant current driver
Each signal is used as input signal for next unit.
* As for the terminal number, refer to the outline dimensions.
LED lamp(dichromatic)
16✕16dots
Dot matrix
Yellow-green Red
¡
In the absence of confirmation by device specification sheets, SHARP takes no responsibility for any defects that may occur in equipment using any SHARP
68 (Notice)
devices shown in catalogs, data books, etc. Contact SHARP in order to obtain the latest device specification sheets before using any SHARP device.
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