LG128645
128 x 64 dots
Built in 8192 Chinese Fonts
ABSOLUTE MAXIMUM RATINGS
Item
Supply Voltage(Logic)
Supply Voltage(LCD)
Input Voltage
Operating Temp.
Storage Temp.
Symbol
V
DD
- V
SS
V
O
- V
SS
V
I
T
opr
T
stg
Min.
-0.3
-0.3
-0.3
-20
-30
Max.
5.5
7.0
V
DD
+ 0.3
70
80
Unit
V
V
V
C
MECHANICAL DATA
Item
Nominal Dimensions
Unit
mm
mm
mm
mm
g
Module Size ( W x H x T ) 93.0 x 70.0 x 10.0/13.5
72.0 x 39.0
Viewing Area ( W x H )
Dot Pitch ( W x H )
0.52 x 0.52
0.48 x 0.48
Dot Size ( W x H )
Weight (Reflective/LED)
Approx. 55/75
C
ELECTRICAL CHARACTERISTICS ( V
DD
=5V
Item
Input High Voltage
Input Low Voltage
Output High Voltage
Output Low Voltage
Supply Current
LCD Driving Voltage
Symbol
V
IH
V
IL
V
OH
V
OL
I
DD
V
O
- V
SS
Test
Condition
--
--
Min.
芒
0.25V )
Typ.
--
--
--
--
3.0
6.5
Max. Unit
V
DD
0.6
V
DD
0.4
5.0
--
V
V
V
V
mA
V
PIN CONNECTIONS
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Symbol
V
SS
V
DD
NC
RS
R/W
E
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
PSB
NC
/RST
NC
LEDA
LEDK
Level
0V
+5V
--
H/L
H/L
_
H,H >L
H/L
H/L
H/L
H/L
H/L
H/L
H/L
H/L
H/L
--
L
--
+5V
0V
Function
GND
Power supply for logic
No connection
H : Data L : Instruction code
H : Read L : Write
Enable signal
0.7V
DD
- 0.3
I
OH
= - 0.1mA 0.8V
DD
I
OL
= 0.1mA
0
--
V
DD
= 5.0V
--
Ta=25 C
BLOCK DIAGRAM
Control Signals
ST7921
V
SS
V
DD
RS(CS)
R/W(SID)
E(SCLK)
PS
/RST
DB0
DB7
LEDA
LEDK
ST7921
LED B/L
Control Signals
Data bus line
LCD
Controller
LSI
ST7920
64 SEG
32 COM
64 SEG
128 x 32 dots
128 x 32 dots
32 COM
32 SEG
96 SEG
H: Parallel mode L: Serial mode
No Connection
Reset signal, active "L"
No connection
Power supply for LED backlight
LED BACKLIGHT SPECIFICATIONS (Ta=25 C)
Item
Forward Voltage
Forward Current
Emission Wave Length
Symbol
V
f
I
f
位
p
Typ.
4.1
300
568
Max.
4.3
--
--
Unit
V
mA
nm
1
