DISPLAY Elektronik GmbH
LCD MODULE
DEM 20487 SYH-LY
Product Specification Version : 3.1.1
03.09.2008
GENERAL SPECIFICATION
MODULE NO. :
DEM 20487 SYH-LY
VERSION NO. CHANGE DESCRIPTION
0 ORIGINAL VERSION 12.02.2001
1 CHANGING EXTERNAL 21.02.2001
2
3 PCB CHANGED 12.10.2001
3.1.1 CHANGE IC 31.01.2008
CHANGE BACKLIGHT CURRENT
DATE
30.03.2001
PREPARED BY: OYQ DATE: 31.01.2008
APPROVED BY: MH DATE: 03.09.2008
DEM 20487 SYH-LY Product Specification
CONTENTS
1. FUNCTIONS & FEATURES -----------------------------------------------------------------2
2. MECHANICAL SPECIFICATIONS --------------------------------------------------------2
3. BLOCK DIAGRAM ---------------------------------------------------------------------------3
4. EXTERNAL DIMENSIONS-----------------------------------------------------------------3
5. PIN ASSIGNMENT---------------------------------------------------------------------------4
6. PCB DRAWING AND DESCRIPTION ---------------------------------------------------4
7. BACKLIGHT & SWITCH--------------------------------------------------------------------6
8. DISPLAY DATA RAM ------------------------------------------------------------------------7
9. MAXIMUM ABSOLUTE LIMIT------------------------------------------------------------7
10. ELECTRICAL CHARACTERISTICS-----------------------------------------------------7
11. CONTROL AND DISPLAY COMMAND ------------------------------------------------10
12. STANDARD CHARACTER PATTERN --------------------------------------------------11
13. LCD MODULES HANDLING PRECAUTIONS----------------------------------------12
14. OTHERS ---------------------------------------------------------------------------------------12
Version: 3.1.1 PAGE: 1
DEM 20487 SYH-LY Product Specification
1. FUNCTIONS & FEATURES
MODULE LCD TYPE
DEM 20487 SYH-LY STN Yellow Green Transflective Positive Mode
z Viewing Direction : 6 O’clock
z Driving Scheme : 1/16 Duty Cycle, 1/5 Bias
z Power Supply Voltage : 5.0V (typ.)
z Backlight Color : Yellow Green
z VLCD
z Display contents : 20 x 4 Characters
z Operating Temperature : - 20°C to + 70°C
z Storage Temperature : - 30°C to + 80°C
z Internal Memory : CGROM (10,080 bits )
: DDRAM (80 x 8 bits for Digits)
z Interface : Easy Interface with a 4-bit or 8-bit MPU
: 4.5V (typ.)
: CGRAM (64 x 8 bits )
2. MECHANICAL SPECIFICATIONS
z Module Size : 146.00 x 62.50 x 14.00 mm
z Character Pitch : 6.00 x 9.75 mm
z Character Size : 4.85 x 9.23 mm
z Character Font : 5 x 8 dots
z Dot Size : 0.93 x 1.11 mm
z Dot Pitch : 0.98 x 1.16 mm
Version: 3.1.1 PAGE: 2
DEM 20487 SYH-LY Product Specification
3. BLOCK DIAGRAM
LCD PANEL
4 Line x 20 Characters
SEG41~SEG120
SEGMENT
DRIVER
ST7063
SEGMENT
DRIVER
ST7063
SEG121~SEG20
DB0~DB7
E
R/W
RS
V0
VDD
VSS
LCD
Controller
LSI
ST7066U
COM1~COM16
SEG1~SEG40
Control signals
A
K
BACKLIGHT
4. EXTERNAL DIMENSIONS
Version: 3.1.1 PAGE: 3
DEM 20487 SYH-LY Product Specification
b
5. PIN ASSIGNMENT
Pin No. Symbol Function
1 VSS
2 VDD
3 V0 Power Supply for LCD
4 RS Register Select RS=0: Instruction Register; RS=1: Data Register
5 R/W Read / Write R/W=0: Read; R/W=1: Write
6 E Enable
7 DB0
8 DB1
9 DB2
10 DB3
11 DB4
12 DB5
13 DB6
14 DB7
15 LED-(K)
16 LED+(A)
Ground terminal of module
Power supply of module 5V
Bi-directional data bus, data transfer is performed once, thru DB0~DB7,
in the case of interface data. Length is 8in the case of interface data length is 4-bits.
Upper four bits first then lower four bits.
Please also refer to 6.1 PCB drawing and description.
it; and twice, thru DB4~DB7
6. PCB DRAWING AND DESCRIPTION
Note: The part no. DEM 20487 is printed on the PCB.
Version: 3.1.1 PAGE: 4
DEM 20487 SYH-LY Product Specification
DESCRIPTION:
6-1-1.The polarity of the pin 15 and the pin 16
LED Polarity(1) LED Polarity(2)
15 Pin 16Pin 15 Pin 16 Pin
Anode Cathode Cathode Anode
J3=J5=open
J2=J4=closed
Note: In application module, J2=J4= open and J3=J5=closed
6-1-2.The metal-bezel should be on ground when the J1 is solder-Bridge.
Note: In application module, J1=closed
6-1-3.The LED resistor should be bridged when the J6 is solder-Bridge.
Note: In application module, J6=open
6-1-4.The R7 and the R8 are the LED resistor. R7=R8=10 Ohm
J3=J5= closed
J2=J4= open
Version: 3.1.1 PAGE: 5
DEM 20487 SYH-LY Product Specification
7. BACKLIGHT & SWITCH (Ta=-20~70°C)
CONDI T I ONS
入
IMPORTANT NOTE: The LED-current of the module is limited to ~ 230mA due to the LED-resistors on board.
Version: 3.1.1 PAGE: 6
DEM 20487 SYH-LY Product Specification
8. DISPLAY DATA RAM (DDRAM)
FIRST
LINE
SECOND
LINE
THIRDD
LINE
FOURTH
LINE
1
00
01
41
40
14 15
5554
5
16
02
42
56
4
3
04
03
44
43
17
18
57
58
2
05
45
19
59
6
7
8
06
07
47
46
1A 1B
5B5A
9
10
09
08
48
49
1D 1E 1F
1C
5C
11
0A
4A
14
12
13
0B
0C
4B
4C
20 21 22 23 24 25 26 27
5F5E5D
15
0D
0E4E0F 10
4D
16
4F
17
50
18 19
11
51
12
52 53
20
13
6766656463626160
9. MAXIMUM ABSOLUTE LIMIT (Ta=25°C)
Item Symbol Standard value Unit
Power supply voltage (1) VDD -0.3~+7.0 V
Power supply voltage (2) V0 V
Input voltage
VIN -0.3~VDD+0.3
Operating temperature Topr -20~+70 °C
-15.0~VDD+0.3 V
DD
V
Storage temperature Tstg -30~+80 °C
*Voltage greater than above may damage to the Circuit.
VDD＞V1＞V2＞V3＞V4＞V5
10. ELECTRICAL CHARACTERISTICS
Test
-------
Unit
V
10-1 DC Characteristics(VDD=4.5V~5.5V,Ta=-20~+70°C)
Standard Value
Item Symbol
Operating Voltage V
Supply Current I
DD
DD
MIN TYP MAX
4.5 5 5.5
---- 0.35 0.6 VDD=5V,fosc=270kHz mA
Condition
LCD Driving Voltage VLCD 3.0 4.5 13.0 VDD-V5 (1/5,1/4 Bias) V
Version: 3.1.1 PAGE: 7
DEM 20487 SYH-LY Product Specification
10-2. AC Characteristics (VDD=4.5V~5.5V , Ta=-20~+70°C)
10-2-1 Write mode (writing data from MPU to module)
Characteristic Symbol Min Type Max Unit Test PIN
E Cycle Time t
C
1200 --- --- ns E
E Rise Time
E Fall Time t
E Pulse width (High,Low)
R/W and RS Set-up Time t
R/W and RS Hold Time t
Data Set-up Time t
Data Hold Time t
VIH1
RS
VIL1
tAS
R/W
t
R
F
t
W
SU1
H1
SU2
H2
--- --- 25 ns E
--- --- 25 ns E
140 --- --- ns E
0 --- --- ns R/W,RS
10 --- --- ns R/W,RS
40 --- --- ns DB0~DB7
10 --- --- ns DB0~DB7
tAH
VIL1
tPW
tAH
tr
DB0~DB 7
E
tr
tDSW
Valid Data
tH
tC
Version: 3.1.1 PAGE: 8
DEM 20487 SYH-LY Product Specification
10-2-2 Read mode (reading data from module to MPU)
Characteristic Symbol Min Type Max Unit Test PIN
E Cycle Time t
C
1200 --- --- ns E
E Rise Time
E Fall Time t
E Pulse width (High, Low)
R/W and RS Set-up Time t
R/W and RS Hold Time t
Data Setup Time t
Data Hold Time t
VIH1
RS
V
IL1
tAS
t
R
t
W
SU
H
D
DH
--- --- 25 ns E
F
--- --- 25 ns E
140 --- --- ns E
0 --- --- ns R/W,RS
10 --- --- ns R/W,RS
--- ---
100
ns DB0~DB7
10 --- --- ns DB0~DB7
tAH
R/W
E
DB0~DB7
tPW
tr
tDDR
Val id Data
tC
tAH
tr
tH
Version: 3.1.1 PAGE: 9
DEM 20487 SYH-LY Product Specification
11. CONTROL AND DISPLAY COMMAND
Execution
Command RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
time
(fosc=270KHz)
Remark
Clear
Display
Return
home
Entry mode
Set
Display
on/off
control
Cursor
or
Display
Shift
function
Set
Set
CGRAM
address
0 0 0 0 0 0 0 0 0 1 1.52ms
0 0 0 0 0 0 0 0 1 x 1.52ms
0 0 0 0 0 0 0 1 I/D S 37us
0 0 0 0 0 0 1 D C B 37us
0 0 0 0 0 1 S/C R/L x x 37us
0 0 0 0 1 DL N F x x 37us
0 0 0 1 AC5 AC4 AC3 AC2 AC1 AC0 37us
Write”20H” to DDRAM. And set
DDRAM address to “00H” from AC
Set DDRAM address to “00H” from
AC and return cursor to its original
position if shifted. The contents of
DDRAM are not changed.
Sets cursor move direction and specifies
display shift. These operations are
performed during data write and read.
D=1: entire display on
C=1: cursor on
B=1: cursor position on
Set cursor moving and display shift
control bit, and the direction, without
changing DDRAM data.
DL: interface data is 8/4 bits
N: number of line is 2/1
F: font size is 5x11/5x8
Set CGRAM address in address
counter
Set
DDRAM
address
Read busy
flag&
address
Write data
to RAM
Read data
from RAM
Note:
Be sure the ST7066U is not in the busy state (BF=00 before sending an instruction from the MPU to the ST7066U. If
0 0 1 AC6 AC5 AC4 AC3 AC2 AC1 AC0 37us
0 1 BF AC6 AC5 AC4 AC3 AC2 AC1 AC0 0us
1 0 D7 D6 D5 D4 D3 D2 D1 D0 37us
1 1 D7 D6 D5 D4 D3 D2 D1 D0 37us
Set DDRAM address in address
counter
Whether during internal operation or
not can be known by reading BF. The
contents of address counter can also be
read.
Write data into internal RAM
(DDRAM/CGRAM)
Read data from internal RAM
(DDRAM / CGRAM)
an instruction is sent without checking the busy flag, the time between the first instruction and next instruc tion will
take much longer than the instruction time itself. Refer to instruction table for the list of each instruction execution
time.
Version: 3.1.1 PAGE: 10
DEM 20487 SYH-LY Product Specification
12. STANDARD CHARACTER PATTERN (ST7066U-0A)
U p p er(4 b i t )
Lo w e rr(4 bit)
0000
0000
CG RAM
( 1 )
0001 0010 0011 0100 0101 0110 0111 1000 1001 10010 1011 1100 1101 1110 1111
0001
0010
0011
0100
0101
0110
0111
1000
( 2 )
( 3 )
( 4 )
( 5 )
( 6 )
( 7 )
( 8 )
( 1 )
1001
1010
1011
1100
1101
1110
1111
( 2 )
( 3 )
( 4 )
( 5 )
( 6 )
( 7 )
( 8 )
Version: 3.1.1 PAGE: 11
DEM 20487 SYH-LY Product Specification
13. LCD MODULES HANDLING PRECAUTIONS
The display panel is made of glass. Do not subject it to a mechanical shock by dropping it from a high place, etc.
If the display panel is damaged and the liquid crystal substance inside it leaks out, do not get any in your mouth. If
the substance comes into contact with your skin or clothes promptly wash it off using soap and water.
Do not apply excessive force to the display surface or the adjoining areas since this may cause the color tone to
vary.
The polarizer covering the display surface of the LCD module is soft and easily scratched. Handle this polarizer
carefully.
To prevent destruction of the elements by static electricity, be careful to maintain an optimum work environment.
-Be sure to ground the body when handling the LCD module.
-Tools required for assembly, such as soldering irons, must be properly grounded.
-To reduce the amount of static electricity generated, do not conduct assembly and other work under dry conditions.
-The LCD module is coated with a film to protect the display surface. Exercise care when peeling off this protective
film since static electricity may be generated.
Storage precautions
When storing the LCD modules, avoid exposure to direct sunlight or to the light of fluorescent lamps. Keep the
modules in bags designed to prevent static electricity charging under low temperature / normal humidity conditions
(avoid high temperature / high humidity and low temperatures below 0°C).Whenever possible, the LCD modules
should be stored in the same conditions in which they were shipped from our company.
14. OTHERS
Liquid crystals solidify at low temperature (below the storage temperature range) leading to defective orientation of
liquid crystal or the generation of air bubbles (black or white). Air bubbles may also be generated if the module is
subjected to a strong shock at a low temperature.
If the LCD modules have been operating for a long time showing the same display, patterns may remain on the
screen as ghost images and a slight contrast irregularity may also appear. Abnormal operating status can be resumed
to be normal condition by suspending use for some time. It should be noted that this phenomena does not adversely
affect performance reliability.
To minimize the performance degradation of the LCD modules resulting from caused by static electricity, etc.
exercise care to avoid holding the following sections when handling the modules:
- Exposed area of the printed circuit board
- Terminal electrode sections
Version: 3.1.1 PAGE: 12
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