DISPLAY Elektronik GmbH
LCD MODULE
DEM 20485 SYH
Product Specification Version :1.1.1
07/July/2007
GENERAL SPECIFICATION
MODULE NO. :
DEM 20485 SYH
CUSTOMER P/N
VERSION NO. CHANGE DESCRIPTION DATE
0 ORIGINAL VERSION 08.05.2003
1 CHANGE EXTERNAL DIMENSIONS 17.05.2003
1.1.0 CHANGE IC 14.11.2007
1.1.1 ADD J7 INFORMATION 07.07.2009
PREPARED BY: CC DATE: 07.07.2009
APPROVED BY: MH DATE: 07.07.2009
DEM 20485 SYH 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 .................................................................................................................................5
7. DISPLAY DATA RAM (DDRAM)..........................................................................................................................................6
8. MAXIMUM ABSOLUTE LIMIT (TA=25°C).......................................................................................................................6
9. ELECTRICAL CHARACTERISTICS..................................................................................................................................6
10. CONTROL AND DISPLAY COMMAND............................................................................................................................9
11. STANDARD CHARACTER PATTERN (ST7066U-0A)...................................................................................................10
12. LCD MODULES HANDLING PRECAUTIONS..............................................................................................................11
13. OTHERS...............................................................................................................................................................................11
Version:1.1.1 PAGE:1
DEM 20485 SYH Product Specification
1.FUNCTIONS & FEATURES
MODULE NAME LCD TYPE
DEM 20485 SYH STN Yellow-Green Reflective Positive Mode
z Viewing Direction : 6 o’clock
z Driving Scheme : 1/16 Duty Cycle, 1/5 Bias
z Power Supply Voltage : 5.0 Volt (typ.)
z VLCD (VDD-V0) : 4.5 Volt (typ.)
z Display contents : 20x4Characters (5x8 dots, Format: 208 Kinds )
z Internal Memory : CGROM (10,080 bits )
: CGRAM (64 x 8 bits )
: DDRAM (80 x 8 bits for Digits)
z CGROM : CGROM of the ST7066U-0A
z Interface : Easy Interface with a 4-bit or 8-bit MPU
z Operating Temperature : -20°C to +70°C
z Storage Temperature : -30°C to +80°C
2. MECHANICAL SPECIFICATIONS
z Module Size : 98.00 x 60.00 x 9.00 mm
z Character Pitch : 3.55 x 5.35 mm
z Character Size : 2.95 x 4.75 mm
z Character Font : 5 x 8 dots
z Dot Size : 0.55 x 0.55 mm
z Dot Pitch : 0.60 x 0.60 mm
z Dot Gap : 0.05 mm
Version:1.1.1 PAGE:2
DEM 20485 SYH Product Specification
3. BLOCK DIAGRAM
DB0~DB7
E
R/W
LCD
COM1~COM16
Controller
RS
V0
VDD
VSS
LSI
ST7066U-0A
SEG1~SEG40
Control signals
LCD PANEL
4 Line x 20 Characters
SEG41~SEG120
SEGMENT
DRIVER
ST7063
SEGMENT
DRIVER
ST7063
SEG121~SEG200
4. EXTERNAL DIMENSIONS
Version:1.1.1 PAGE:3
DEM 20485 SYH Product Specification
5. PIN ASSIGNMENT
Pin No. Symbol
1 VSS
2 VDD
3 V0 Power Supply for LCD
4 RS
5 R/W
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
Register Select
RS=0…Instruction Register
RS=1…Data Register
Read or Write
R/W=1…Read
R/W=0…Write
Bi-directional Data Bus, Data Transfer is performed
Once, thru DB0~DB7, in the case of interface data.
Length is 8-bits; and twice, thru DB4~DB7 in the case
of interface data length is 4-bits.
Upper four bits first then lower four bits.
NO Used
Function
Version:1.1.1 PAGE:4
DEM 20485 SYH Product Specification
6. PCB DRAWING AND DESCRIPTION
6.1 PCB Drawing
DESCRIPTION:
6-1-1. In application module, J2=J3=J4=J5=J6=open
6-1-2. The metal-bezel can be on ground when the J1 is closed
Note: In application module, J1= closed.
6-1-3. The mounting holes can be set to ground when J7 is closed.
Note: In application module, J7 = closed.
Version:1.1.1 PAGE:5
DEM 20485 SYH Product Specification
7. DISPLAY DATA RAM (DDRAM)
DISPLAY POSITION
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
FIRST LINE 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
SECOND LINE 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53
THIRD LINE 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
FOURTH LINE 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67
DD RAM ADDRESS
8. 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 V
Operating temperature Topr -20~+70 ℃
Storage temperature Tstg -30~+80 ℃
-13.5~VDD+0.3 V
DD
*Voltage greater than above may damage to the Circuit.
VDD＞V1＞V2＞V3＞V4＞V5
9. ELECTRICAL CHARACTERISTICS
9-1 DC Characteristics (VDD=4.5V~5.5V,Ta=-20~+70°C)
Item Symbol
Operating Voltage V
DD
MIN TYP MAX
4.5 5 5.5
LCD Driving Voltage VLCD 3.0 4.5 13.0 VDD-V0 V
Standard Value
Supply Current I
DD
---- 0.35 0.6 VDD=5V,fosc=270kHz mA
Test
Condition
-------
Unit
V
Version:1.1.1 PAGE:6
DEM 20485 SYH Product Specification
9-2 AC Characteristics (VDD=4.5V~5.5V , Ta=-20~+70°C)
9-2-1 Write mode (writing data from MPU to ST7066)
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
Address Setup Time t
Address Hold Time
Data Set-up Time t
Data Hold Time t
RS
R/W
VIH1
VIL1
tAS
t
R
F
t
W
SU1
t
H1
SU2
H2
--- --- 25 ns E
--- --- 25 ns E
140 --- --- ns E
0 --- --- ns R/W,RS,E
10 --- --- ns R/W,RS,E
40 --- --- ns DB0~DB7
10 --- --- ns DB0~DB7
tAH
VIL1
tPW
tAH
tr
DB0~DB 7
E
tr
tDSW
Valid Data
tH
tC
Version:1.1.1 PAGE:7
DEM 20485 SYH Product Specification
9-2-2 Read mode (reading data from ST7066 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
Address Setup Time t
Address Hold Time t
Data Setup Time
Data Hold Time
VIH1
RS
V
IL1
tAS
R/W
t
tp
AS
AH
t
DDR
t
R
F
W
--- --- 25 ns E
--- --- 25 ns E
140 --- --- ns E
0 --- --- ns R/W,RS,E
10 --- --- ns R/W,RS,E
--- ---
H
10 --- --- ns DB0~DB7
tPW
100
tAH
tAH
tr
ns DB0~DB7
E
DB0~DB7
tr
tDDR
Val id Data
tC
tH
Version:1.1.1 PAGE:8
DEM 20485 SYH Product Specification
10. CONTROL AND DISPLAY COMMAND
Command RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Clear
Display
Return home 0 0 0 0 0 0 0 0 1 x 1.52ms
Entry mode
Set
Display
on/off
control
Cursor
or
Display Shift
function
Set
0 0 0 0 0 0 0 0 0 1 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
Execution time
(fosc=270KHz)
Remark
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
Set DDRAM
address
Read busy
flag&
address
Write data
to RAM
Read data
from RAM
Note:
Be sure the ST7066U is not is not in the busy state (BF=00 before sending an instruction from the MPU to the
0 0 0 1 AC5 AC4 AC3 AC2 AC1 AC0 37us Set CGRAM address in address counter
0 0 1 AC6 AC5 AC4 AC3 AC2 AC1 AC0 37us Set DDRAM address in address counter
Whether during internal operation or not
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
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)
ST7066U. If an instruction is sent without checking the busy flag, the time between the first instruction and next
instruction will take much longer than the instruction time itself. Refer to instruction table for the list of each
instruction execution time.
Version:1.1.1 PAGE:9
DEM 20485 SYH Product Specification
11. STANDARD CHARACTER PATTERN (ST7066U-0A)
Upper(4bit)
Lo w e rr(4 b i t )
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:1.1.1 PAGE:10
DEM 20485 SYH Product Specification
12. LCD MODULES HANDLING PRECAUTIONS
Please remove the protection foil of polarizer before using.
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 come 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 polarize
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.
13. OTHERS
Liquid crystals solidify at low temperature (below the storage temperature range) leading to defective orie ntation 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:1.1.1 PAGE:11
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