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DISPLAY Elektronik GmbH
LCD MODULE
DEM 20231 SYH-PY
Product Specification
Version: 2
24/Nov/2008
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GENERAL SPECIFICATION
MODULE NO. :
DEM 20231 SYH-PY
CUSTOMER P/N
VERSION NO. CHANGE DESCRIPTION
0 ORIGINAL VERSION 14.02.2001
1 CHANGE LCD-DRIVER 08.07.2008
2 CHANGE PCB DESCRIPTION 24.11.2008
DATE
PREPARED BY: CXG DATE: 24.11.2008
APPROVED BY: MH DATE: 24.11.2008
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DEM 20231 SYH-PY Product Specification
CONTENTS
1. FUNCTIONS & FEATURES -----------------------------------------------------------------2
2. MECHANICAL SPECIFICATIONS --------------------------------------------------------2
3. BLOCK DIAGRAM ---------------------------------------------------------------------------3
5. EXTERNAL DIMENSIONS-----------------------------------------------------------------3
5. PIN ASSIGNMENT---------------------------------------------------------------------------4
6. PCB DRAWING AND DESCRIPTION-----------------------------------------------------5
7. BACKLIGHT & SWITCH--------------------------------------------------------------------6
8. DISPLAY DATA RAM (DDRAM) ----------------------------------------------------------6
9. MAXIMUM ABSOLUTE POWER RATINGS --------------------------------------------7
10. ELECTRICAL CHARACTERISTICS-----------------------------------------------------8
11. CONTROL AND DISPLAY COMMAND ------------------------------------------------10
12. STANDARD CHARACTER PATTERN -------------------------------------------------- 11
13. LCD MODULES HANDLING PRECAUTIONS----------------------------------------12
14. OTHERS ---------------------------------------------------------------------------------------12
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DEM 20231 SYH-PY Product Specification
1. FUNCTIONS & FEATURES
MODULE NAME LCD TYPE
DEM 20231 SYH-PY 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 : 5.0 Volt (typ.)
z VLCD Adjustable for Best Contrast : 4.5 Volt (typ.)
z Backlight Color : LED, Lightguide, Yellow Green
z Display contents : 20x2 Characters (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
z Interface : Easy Interface with a 4-bit or 8-bit MPU
z Operating Temperature : -20°C to +70°C
z Storage Temperature : -25°C to +75°C
: CGROM of the ST7066-0A-B (Sitronix)
2. MECHANICAL SPECIFICATIONS
z Module Size : 116.00 x 37.00 x 12.00 mm
z Character Pitch : 3.70 x 5.95 mm
z Character Size : 3.20 x 5.55 mm
z Character Font : 5 x 8 dots
z Dot Size : 0.60 x 0.65 mm
z Dot Pitch : 0.65 x 0.70 mm
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DEM 20231 SYH-PY Product Specification
3. BLOCK DIAGRAM
LCD PANEL
DB0~DB7
E
R/W
RS
V
V
V
LED-(K)
LED+(A)
0
DD
SS
LCD
Controller
LSI
ST7066U-
0A-B
BACKLIGHT
COM1~COM16
SEG1~SEG40
Control signals
2line*20characters
SEG41~SEG100
SEGMENT
DRIVER
ST7063
4. EXTERNAL DIMENSIONS (
unit: mm)
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DEM 20231 SYH-PY Product Specification
5. PIN ASSIGNMENT
Pin No. Symbol
1 VSS Ground terminal of module
2 VDD Supply terminal of module +5 V
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 = 1… Read; R/W = 0… Write
6 E Enable
7 DB0
8 DB1
9 DB2
10 DB3
11 DB4
12 DB5
13 DB6
14 DB7
15
16
LED-(K)
LED+(A)
Bi-directional Data Bus, Data Transfer is performed is 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 .
LED power supply terminals.
Function
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DEM 20231 SYH-PY Product Specification
6. PCB DRAWING AND DESCRIPTION
Note: The part no. DEM20231 is printed on the PCB.
DESCRIPTION:
6-1-1.The polarity of the pin 15 and the pin 16:
J3,J5 J2, J4
Each open Each closed Anode Cathode
Each closed Each open Cathode Anode
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.
Note: In application module, R7=12 Ohm
LED Polarity
15 Pin 16 Pin
6-1-5. The mounting holes are set on ground when J7 is closed..
Note: on application module, J7=closed
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DEM 20231 SYH-PY Product Specification
7. BACKLIGHT & SWITCH (Ta=-20~+70°C)
8. DISPLAY DATA RAM (DDRAM)
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DEM 20231 SYH-PY Product Specification
9. MAXIMUM ABSOLUTE POWER RATINGS (Ta=25°C)
Item Symbol Standard value Unit
Power supply voltage (1) VDD -0.3~+7.0 V
Power supply voltage (2) V
Input voltage
Operating temperature Topr -20~+70 °C
Storage temperature Tstg -25~+75 °C
V
LCD
-0.3~VDD+0.3
V
IN
-15.0~VDD+0.3 V
DD
V
*Voltage greater than above may damage to the Circuit.
VDD＞V1＞V2＞V3＞V4＞V5
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DEM 20231 SYH-PY Product Specification
10. ELECTRICAL CHARACTERISTICS
10-1 DC Characteristics (VDD=4.5V~5.5V, Ta=-20~+70°C)
Item Symbol
Operating Voltage V
Supply Current I
DD
DD
Standard Valu e
MIN TYP MAX
4.5 5 5.5 ------- V
---- 0.35 0.6 VDD=5V,fosc=270kHz mA
Test
Condition
Unit
LCD Driving Vo ltage VLCD 3.0 4.5 13.0 VDD-V5 (1/5 Bias) V
10-2 AC Characteristics (VDD=4.5V~5.5V, Ta=-20~+70°C)
10-2-1 Write mode (writing data from MPU to ST7066)
Characteristic Symbol Min Type Max Unit Test PIN
E Cycle Time t
E Rise Time t
E Fall Time t
E Pulse width (High, Low) t
R/W and RS Set-up Time t
C
R
F
W
SU1
1200 --- --- ns E
--- --- 25 ns E
--- --- 25 ns E
140 --- --- ns E
0 --- --- ns R/W,RS
R/W and RS Hold Time t
Data Set-up Time t
Data Hold Time t
VIH1
RS
VIL1
tAS
R/W
E
tr
H1
SU2
H2
10 --- --- ns R/W,RS
40 --- --- ns DB0~DB7
10 --- --- ns DB0~DB7
tAH
VIL1
tPW
tDSW
tAH
tr
tH
DB0~ DB 7
Valid Data
tC
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DEM 20231 SYH-PY Product Specification
10-2-2 Read mode (Reading data from ST7066 to MPU)
Characteristic Symbol Min Type Max Unit Test PIN
E Cycle Time t
E Rise Time t
E Fall Time t
E Pulse width (High, Low) t
R/W and RS Set-up Time t
R/W and RS Hold Time t
Data Output Delay Time t
Data Hold Time t
VIH1
RS
V
IL1
tAS
C
R
F
W
SU
H
D
DH
1200 --- --- ns E
--- --- 25 ns E
--- --- 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
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DEM 20231 SYH-PY Product Specification
11. 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 in the busy state (BF=00 before sending an instruction from the MPU to the ST7066U. If
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)
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.
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DEM 20231 SYH-PY Product Specification
12. STANDARD CHARACTER PATTERN (ST7066U-0A-B)
Lowerr(4bit)
0010
0000
0001
0011
0100
0101
0110
Upper(4bit)
0000
CG RAM
(1)
(2)
(3)
(4)
(5)
(6)
(7)
0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
0111
1000
1001
1010
1011
1100
1101
(8)
(1)
(2)
(3)
(4)
(5)
(6)
1110
1111
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(7)
(8)
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DEM 20231 SYH-PY Product Specification
13. 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.
14. OTHERS
Liquid crystals solidify at low temperature (below the storage temperature range) leading to defective orienta tion 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
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