Topway LM12864LFC User manual

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LM12864LFC
LCD Module User Manual
Shenzhen TOPWAY Technology Co., Ltd.
Rev. Descriptions Release Date
0.1 Preliminary New release 2003-10-06
0.2 - Typing Correction on Terminal Functions
- Revise LED Backlight Circuit Characteristics VfA Value 2004-05-20
0.3 - Typing Correction on Display Spec 2005-07-25

TOPWAY LCD Module User Manual LM12864LFC
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Document Name: LM12864LFC-Manual-Rev0.3.doc
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Table of Content
1. Basic Specifications................................................................................................................ 3
1.1 Display Specifications ............................................................................................................................................ 3
1.2 Mechanical Specifications...................................................................................................................................... 3
1.3 Block Diagram........................................................................................................................................................ 3
1.4 Terminal Functions................................................................................................................................................. 4
2. Absolute Maximum Ratings.................................................................................................... 5
3. Electrical Characteristics........................................................................................................ 5
3.1 DC Characteristics ................................................................................................................................................. 5
3.2 LED Backlight Circuit Characteristics..................................................................................................................... 5
3.3 AC Characteristics ................................................................................................................................................. 6
4. Function Specifications .......................................................................................................... 7
4.1 Basic Setting .......................................................................................................................................................... 7
4.2 Adjusting the LCD display contrast ........................................................................................................................ 7
4.3 Resetting the LCD module ..................................................................................................................................... 7
4.4 Display Memory Map ............................................................................................................................................. 8
4.5 Internal Registers ................................................................................................................................................... 8
4.6 Display Control Instructions ................................................................................................................................... 9
5. Design and Handling Precaution ......................................................................................... 10

TOPWAY LCD Module User Manual LM12864LFC
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1. Basic Specifications
1.1 Display Specifications
1) LCD Display Mode : STN, Negative, Transmissive
2) Display Color : Display Data = “1” : Light Gray (*1)
: Display Data = “0” : Deep Blue (*2)
3) Viewing Angle : 6 H
4) Driving Method : 1/64 duty, 1/ 9bias
5) Back Light : White LED backlight
Note:
*1. Color tone may slightly change by Temperature and Driving Condition.
*2. The Color is defined as the inactive / background color
1.2 Mechanical Specifications
1) Outline Dimension : 93.0 x 70.0 x 15.3MAX
(see attached Outline Drawing for details)
1.3 Block Diagram
LCD Panel
128 x 64 pixels
S6B0108
or
equivalent
RS, R/W, E, /RST
VSS
SEG1
|
SEG64
S6B0107
or
equivalent
COM1
|
COM64
DB0 - DB7
CS2
V0UT
V0
CS1
LCD Power
Booster
Circuit
LED
Backlight
Circuit
K
VDD
A
S6B0108
or
equivalent
SEG1
|
SEG64

TOPWAY LCD Module User Manual LM12864LFC
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1.4 Terminal Functions
Pin
No.
Pin
Name I/O Descriptions
1 VSS Power Negative Power Supply, Ground (0V)
2 VDD Power Positive Power Supply
3 V0 Power LCD Contrast reference
4 RS Input RS = H; DB0 – DB7 = Display RAM data
RS = L; DB0 – DB7 = Instruction data
5 R/W Input
6 E Input
In read mode
R/W = H;
Data read form the LCD module,
data appears at DB0 – DB7 and can be read by the host
while, E = H and the device is being selected
In write mode
R/W = L;
Data write to the LCD module,
data appears at DB0 – DB7 will be written into the LCD module
at E = HÆL and device is being selected
7 DB0 I/O
: : :
14 DB7 I/O
Data bus;
Three state I/O terminal for display data or instruction data
15 CS1 Input Chip selection,
When CS1=1 (*1)
enable access to the Left Side (64 column) of the LCD module
16 CS2 Input Chip selection
When CS2=1 (*1)
enable access to the Right Side (64 column) of the LCD module
17 /RST Input Reset signal
/RST = L,
Display off
display start line register becomes 0
no command or instruction data could be accepted
/RST = H,
Normal running
18 VOUT Output Power Booster output for V0
19 A Power Positive Power for LED backlight
20 K Power Negative Power for LED backlight
Note:
*1. Display or instruction data could write into the LCD module’s driver/controllers individually
or at the same time.
Only read display or instruction data form one of the driver/controller in the LCD module at
a time, otherwise unexpected data collision may occur.

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2. Absolute Maximum Ratings
Items Symbol Min. Max. Unit Condition
Supply Voltage VDD 0 7.0 V VSS = 0V
Operating Temperature TOP -20 70
°C No Condensation
Storage Temperature TST -20 80
°C No Condensation
Cautions:
Any Stresses exceeding the Absolute Maximum Ratings may cause substantial damage to the
device. Functional operation of this device at other conditions beyond those listed in the
specification is not implied and prolonged exposure to extreme conditions may affect device
reliability.
3. Electrical Characteristics
3.1 DC Characteristics
VSS=0V, VDD =5V, TOP =25°C
Items Symbol MIN. TYP. MAX. Unit Applicable Pin
Operating Voltage VDD 4.8 5.0 5.2 V VDD
Input High Voltage VIH 3.5 - VDD V
Input Low Voltage VIL 0 - 0.4 V
RS, R/W, E, CS1, CS2,
DB0-DB7
Operating Current IDD - 6.5 15 mA VDD, VSS
3.2 LED Backlight Circuit Characteristics
VK=0V, IfA=80mA, TOP=25°C
Items Symbol MIN. TYP. MAX. Unit Applicable Pin
Forward Voltage VfA- 4.9 - V A, K
Forward Current IfA- - 120 mA A, K
K
A

TOPWAY LCD Module User Manual LM12864LFC
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3.3 AC Characteristics
VSS=0V, VDD =5V, TOP =25°C
Item Symbol MIN. TYP. MAX. Unit
E cycle time tc 1500 - - ns
E high level width twh 700 - - ns
E low level width twl 700 - - ns
E rise time tr - - 18 ns
E fall time tf - - 18 ns
Address set-up time tasu 210 - - ns
Address hold time tah 15 - - ns
Data set-up time tdsu 300 - - ns
Data delay time td - - 480 ns
Data hold time (write) tdhw 15 - - ns
Data hold time (read) tdhr 30 - - ns
Host Write Timing Diagram
Host Read Timing Diagram

TOPWAY LCD Module User Manual LM12864LFC
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4. Function Specifications
4.1 Basic Setting
To drive the LCD module correctly and provide normally display, please use the following setting
Display start line (Z address)= 0
LCD Display = on
Note:
These setting/commands should issue to both controllers while start up.
See the Display Control Instructions section for details.
4.2 Adjusting the LCD display contrast
A Variable-Resistor must be connected to the LCD
module for providing a reference to V0. Adjusting the VR
will result the change of LCD display contrast.
The recommended value of VR is 25k to 50k
4.3 Resetting the LCD module
The LCD module should be initialized by setting /RST terminal at low level when turning the power
on.
When /RST pull low, the LCD module will:
- Display off
- Display start line register becomes 0. (Z-address=0)
While /RST is low, no instruction can be accepted except status read. Therefore, execute other
instructions after making sure that DB4=0 (clear /RST) and DB7=0 (ready) by status read
instruction. The conditions of power supply at initial power up are as follow:
Item Symbol MIN. TYP. MAX. Unit
Reset time trs 2.0 - - us
Rise time tr - - 150 ns
LM12864L
VDD
V0
VOUT

TOPWAY LCD Module User Manual LM12864LFC
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4.4 Display Memory Map
Page (X)
address data LCD Display (front view)
0
D0
:
D7
1
D0
:
D7
2
D0
:
D7
3
D0
:
D7
4
D0
:
D7
5
D0
:
D7
6
D0
:
D7
7
D0
:
D7
Column(Y) Address 00h Æ3Fh 00h Æ3Fh
Chip Select CS1=1, CS2=0 CS1=0, CS2=1
Note:
1) Display star line (Z address) = 0
2) The Display Data store separately in two drivers.
3) The Display Data for the left section could be accessed by CS1=1.
The Display Data for the right section could be accessed by CS2=1.
4.5 Internal Registers
There are three registers in each section of LCD module. Each of them could be controlled
independently.
Page (X) Address Register
X address register designates pages of the internal display data RAM. Count function is not
available. The address should set by instruction.
Column (Y) Address Counter
Y address counter designates address of the internal display data RAM. It could be set by
instruction and is increased by 1 automatically by read or write display data operations.
Display Start Line (Z) Register
Z address register indicates of display data RAM to LCD top line. It may be used for scrolling the
display pattern on the LCD.
128x64
p
ixels

TOPWAY LCD Module User Manual LM12864LFC
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4.6 Display Control Instructions
Code
Instructions
RS
R/W
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Function Note
Display on/off 0 0 0 0 1 1 1 1 1 1/0
Controls the display on or off. Internal status and
display data in RAM is not affected
0=off, 1=on
*2
Set Column (Y)
Address 0 0 0 1 Y address (0-63) Set the Column address into the Y address
counter *2
Set Page (X)
Address 0 0 1 0 1 1 1
X address
(0-7) Set the Page address into the X address register *2
Set Display Start
Line (Z address) 0 0 1 1 Z address
(0-63)
Indicates the display data RAM displayed at the
top of the screen *2
Status Read 0 1
Busy
0
on/off
Reset
0000
Read status
Busy=L, Driver ready; Busy=H, Driver busy
on/off=L, Display is on; on/off=H, Display is off
Reset=L, Normal Running; Reset=H, reset
*1
Write Display Data 1 0 Write data
Write display data into display data RAM,
After writing instruction, Y address counter
increased by 1 automatically
*2
Read Display Data 1 1 Read data Read display data form the display data RAM *1
Note:
*1. Only one section (driver) could be read at the same time.
i.e. only the following setting is valid for the operation:
CS1=1, CS2=0 is valid
CS1=0, CS2=1 is valid
*2. Instruction could be write into both drivers at the same time.
*3. For the details of the Display Control Instructions, please refer to Samsung S6B0108
handbook.

TOPWAY LCD Module User Manual LM12864LFC
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5. Design and Handling Precaution
1. The LCD panel is made by glass. Any mechanical shock (eg. dropping form high place)
will damage the LCD module.
2. Do not add excessive force on the surface of the display, which may cause the Display
color change abnormally.
3. The polarizer on the LCD is easily get scratched. If possible, do not remove the LCD
protective film until the last step of installation.
4. Never attempt to disassemble or rework the LCD module.
5. Only Clean the LCD with Isopropyl Alcohol or Ethyl Alcohol. Other solvents (eg. water)
may damage the LCD.
6. When mounting the LCD module, make sure that it is free form twisting, warping and
distortion.
7. Ensure to provide enough space (with cushion) between case and LCD panel to
prevent external force adding on it, or it may cause damage to the LCD or degrade the
display result.
8. Only hold the LCD module by its side. Never hold LCD module by add force on the heat
seal or TAB.
9. Never add force to component of the LCD module. It may cause invisible damage or
degrade of the reliability.
10. LCD module could be easily damaged by static electricity. Be careful to maintain an
optimum anti-static work environment to protect the LCD module.
11. When peeling off the protective film from LCD, static charge may cause abnormal
display pattern. It is normal and will resume to normal in a short while.
12. Take care and prevent get hurt by the LCD panel sharp edge.
13. Never operate the LCD module exceed the absolute maximum ratings.
14. Keep the signal line as short as possible to prevent noisy signal applying to LCD
module.
15. Never apply signal to the LCD module without power supply.
16. IC chip (eg. TAB or COG) is sensitive to the light. Strong lighting environment could
possibly cause malfunction. Light sealing structure casing is recommend.
17. LCD module reliability may be reduced by temperature shock.
18. When storing the LCD module, avoid exposure to the direct sunlight, high humidity, high
temperature or low temperature. They may damage or degrade the LCD module