14/Nov/2007
DISPLAY Elektronik GmbH
DEM 20485 SYH-LY
LCD MODULE
Product S
p
eci
f
ication Version:1.1.0
GENERAL SPECIFICATION
MODULE NO. :
DEM 20485 SYH-LY
CUSTOMER P/N
VERSION NO. CHANGE DESCRIPTION DATE
0 ORIGINAL VERSION 29.10.2001
1.1.0 CHANGE IC 14.11.2007
PREPARED BY: OYQ DATE: 14.11.2007
APPROVED BY: MH DATE: 22.11.2008
DEM 20485 SYH-LY Product Specification
Version: 1.1.0 PAGE: 1
1. FUNCTIONS & FEATURES ----------------------------------------------------------------- 2
2. MECHANICAL SPECIFICATIONS -------------------------------------------------------- 2
3. EXTERNAL DIMENSIONS------------------------------------------------------------------ 3
4. BLOCK DIAGRAM -------------------------------------------------------------------------- 3
5. PIN ASSIGNMENT --------------------------------------------------------------------------- 4
6. PCB DRAWING AND APPLICATION ---------------------------------------------------- 5
7. BACKLIGHT ELECTRICAL/OPTICAL SPECIFICATIONS-------------------------- 6
8. DISPLAY DATA RAM (DDRAM)---------------------------------------------------------- 7
9. MAXIMUM ABSOLUTE POWER LIMIT ------------------------------------------------ 7
10. CONTROL AND DISPLAY COMMAND------------------------------------------------- 8
11. STANDARD CHARACTER PATTERN（ST7066U-0A）----------------------------- 9
12. ELECTRICAL CHARACTERISTICS ----------------------------------------------------- 10
13. LCD MODULES HANDLING PERCAUTIONS ---------------------------------------- 12
14. OTHERS --------------------------------------------------------------------------------------- 12
CONTENTS
DEM 20485 SYH-LY Product Specification
Version: 1.1.0 PAGE: 2
1.FUNCTIONS & FEATURES
MODULE NAME LCD TYPE
DEM 20485 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 Volt (typ.)
z VLCD (VDD-V0) :4.5 Volt (typ.)
z Backlight Color : LED, Lightbox, Yellow-Green
z Display contents : 20 x4 Characters (5 x 8 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 ST7066-0A
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 14.50 mm
z Character Font : 5 x 8 dots
z Character Size : 4.75 x 2.95 mm
z Character Pitch : 5.35 x 3.55 mm
z Dot Size : 0.55 x 0.55 mm
z Dot Pitch : 0.60 x 0.60 mm
z Dot Gap : 0.05mm
DEM 20485 SYH-LY Product Specification
Version: 1.1.0 PAGE: 3
3. EXTERNAL DIMENSIONS ( unit: mm)
4. BLOCK DIAGRAM
DB0~DB7
E
R/W LCD
RS Controller
LSI
V0ST7066
VDD
VSS
A
K
SEGMENT
DRIVER
ST7063
Control signals
SEG41~SEG120
COM1~COM16 LCD PANEL
4line*20characters
BACKLIGHT
SEG1~SEG40
SEG121~SEG200
SEGMENT
DRIVER
ST7063
DEM 20485 SYH-LY Product Specification
Version: 1.1.0 PAGE: 4
5. PIN ASSIGNMENT
Pin No. Symbol Function
1 VSS Ground terminal of module
2 VDD Supply terminal of module +5 V
3 V0 Power Supply for Liquid crystal Drive
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
Bi-directional Data Bus, Data Transfer is performed once , thru DB0~DB7 , in
the case of interface data . Length is 8-
b
its; and twice , thru DB4~DB7 in the
case of interface data length is 4-bits. Upper four bits first then lower four
bits .
15 LED- (K)
16 LED+ (A)
Please also refer to 6.1 PCB drawing and description.
DEM 20485 SYH-LY Product Specification
Version: 1.1.0 PAGE: 5
6. PCB DRAWING AND APPLICATION
6.1 PCB Drawing And Description
Note: on application module, R1~R5=820Ω, R6=91KΩ
Description :
6-1-1.The polarity of the pin 15 and the pin 16
LED Polarity
J3,J5 J2, J4 15 Pin 16 Pin
Each open Each closed Anode Cathode
Each closed Each open Cathode Anode
Note: on application module, J3=J5= closed, J2=J4=open
6-1-2. The metal-bezel is set on ground when the J1 is closed .
Note: on application module, J1=closed
6-1-3.The LED resistor should can be bridged when the J6 is open.
Note: on application module, J6=open
6-1-4.The R7 and the R8 are the LED resistor.
Note: on application module, R7= R8=10Ω.
DEM 20485 SYH-LY Product Specification
Version: 1.1.0 PAGE: 6
7. BACKLIGHT ELECTRICAL/OPTICAL SPECIFICATIONS
7.1 Absolute Maximum Ratings (Ta=25°C)
Item Symbol Conditions Rating Unit
Absolute maximum forward current Ifm 480 mA
Peak forward current Ifp 1 msec plus 10% guty cycle 1152 mA
Reverse Voltage Vr 5 V
Power dissipation Pd 2400 mW
7.2 Electrical-optical characteristics (Ta=25°C)
Item Symbol Min. Typ. Max. Unit Condition
Forward voltage Vf 3.8 4.0 4.3 V If=240mA
Reverse current Ir 100 uA Vr=4.0V
Dominant wave length λD 569 572 575 nm If=240mA
Spectral line half width Δλ 25 nm If=240mA
Luminance Lv (140) cd/m2 If=240mA
7.3 Backlight Drawing ( unit: mm)
）
）
）
DEM 20485 SYH-LY Product Specification
Version: 1.1.0 PAGE: 7
8. DISPLAY DATA RAM (DDRAM)
9. MAXIMUM ABSOLUTE POWER LIMIT
Item Symbol Standard value Unit
Power supply voltage (1) VDD -0.3~+7.0 V
Power supply voltage (2) VLCD V
DD-15.0~VDD+0.3 V
Input voltage VIN -0.3~VDD+0.3 V
Volt. For BL VLED1 4~4.5 V
Operating temperature Topr -20~+70 ℃
Storage temperature Tstg -30~+80 ℃
*Voltage greater than above may damage to the Circuit.
VDD＞V1＞V2＞V3＞V4＞V5
DEM 20485 SYH-LY Product Specification
Version: 1.1.0 PAGE: 8
10. CONTROL AND DISPLAY COMMAND
Command RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Execution time
(fosc=270KHz) Remark
Clear
Display 0 0 0 0 0 0 0 0 0 1 1.52ms Write”20H” to DDRAM. And set
DDRAM address to “00H” from AC
Return home 0 0 0 0 0 0 0 0 1 x 1.52ms
Set DDRAM address to “00H” from AC
and return cursor to its original position if
shifted. The contents of DDRAM are not
changed.
Entry mode
Set 0 0 0 0 0 0 0 1 I/D S 37us
Sets cursor move direction and specifies
display shift. These operations are
performed during data write and read.
Display
on/off
control
0 0 0 0 0 0 1 D C B 37us
D=1: entire display on
C=1: cursor on
B=1: cursor position on
Cursor
or
Display Shift
0 0 0 0 0 1 S/C R/L x x 37us
Set cursor moving and display shift control
bit, and the direction, without changing
DDRAM data.
function
Set 0 0 0 0 1 DL N F x x 37us
DL: interface data is 8/4 bits
N: number of line is 2/1
F: font size is 5x11/5x8
Set CGRAM
address 0 0 0 1 AC5 AC4 AC3 AC2 AC1 AC0 37us Set CGRAM address in address counter
Set DDRAM
address 0 0 1 AC6 AC5 AC4 AC3 AC2 AC1 AC0 37us Set DDRAM address in address counter
Read busy
flag&
address
0 1 BF AC6 AC5 AC4 AC3 AC2 AC1 AC0 0us
Whether during internal operation or not
can be known by reading BF. The contents
of address counter can also be read.
Write data
to RAM 1 0 D7 D6 D5 D4 D3 D2 D1 D0 37us Write data into internal RAM
(DDRAM/CGRAM)
Read data
from RAM 1 1 D7 D6 D5 D4 D3 D2 D1 D0 37us Read data from internal RAM (DDRAM /
CGRAM)
Note:
Be sure the ST7066U is not is not in the busy state (BF=00 before sending an instruction from the MPU to the
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.
DEM 20485 SYH-LY Product Specification
Version: 1.1.0 PAGE: 9
11.STANDARD CHARACTER PATTERN (ST7066U-0A)
0000
0000
CG RAM
( 1 )
0001
( 2 )
0010
( 3 )
0011
( 4 )
0100
( 5 )
0101
( 6 )
0110
( 7 )
0111
( 8 )
1000
( 1 )
1001
( 2 )
1010
( 3 )
1011
( 4 )
1100
( 5 )
1101
( 6 )
1110
( 7 )
1111
( 8 )
0001 0010 0011 0100 0101 0110 0111 1000 1001 10010 1011 1100 1101 1110 1111
U p p e r(4 b i t)
L o w e rr(4 b it)
DEM 20485 SYH-LY Product Specification
Version: 1.1.0 PAGE: 10
12. ELECTRICAL CHARACTERISTICS
12-1-1 DC Characteristics (VDD=4.5V~5.5V, Ta=-30~+80°C)
Standard Value
Item Symbol MIN TYP MAX
Test
Condition Unit
Operating Voltage VDD 4.5 5 5.5 ------- V
Supply Current IDD ---- 0.35 0.6 VDD=5V,fosc=270kHz mA
LCD Driving Voltage VLCD 3.0 4.5 13.0 VDD-V0(5, 1/4 Bias) V
12-2 AC Characteristics (VDD=4.5V~5.5V , Ta=-30~+80°C)
12-2-1 Write mode (writing data from MPU to module)
Characteristic Symbol Min Type Max Unit Test PI N
E Cycle Time tC 1200 --- --- ns E
E Rise Time tR --- --- 25 ns E
E Fall Time tF --- --- 25 ns E
E Pulse width tW 140 --- --- ns E
Address Setup Time tSU1 0 --- --- ns R/W,RS,E
Address Hold Time tH1 10 --- --- ns R/W,RS,E
Data Set-up Time tSU2 40 --- --- ns DB0~DB7
Data Hold Time tH2 10 --- --- ns DB0~DB7
RS
R/W
E
DB0~DB7
tC
tDSW
tAS
tPW
tAH
tH
VIH1
VIL1
VIL1
Valid Data
tr
tAH
tr
DEM 20485 SYH-LY Product Specification
Version: 1.1.0 PAGE: 11
12-2-2 Read mode (reading data from module to MPU )
Characteristic Symbol Min Type Max Unit Test PIN
E Cycle Time tC 1200 --- --- ns E
E Rise Time tR --- --- 25 ns E
E Fall Time tF --- --- 25 ns E
E Pulse width tpW 140 --- --- ns E
Address Setup Time tAS 0 --- --- ns R/W,RS,E
Address Hold Time tAH 10 --- --- ns R/W,RS,E
Data Setup Time tDDR --- ---
100 ns DB0~DB7
Data Hold Time tH 10 --- --- ns DB0~DB7
Va lid Data
VIL1
VIH1
tH
tAH
tAH
tPW
tAS
tDDR
tr
tC
DB0~DB7
E
R/W
RS
tr
DEM 20485 SYH-LY Product Specification
Version: 1.1.0 PAGE: 12
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 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
