LM240128JCW
LCD Module User Manual
Prepared by:
Checked by:
Approved by:
Wei
Date: 2013-6-21
Date:
Date:
Rev. Descriptions
Release Date
0.1
Preliminary release
2013-6-21
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Document Name: LM240128JCW-Manual-Rev0.1
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LCD Module User Manual
LM240128JCW
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
Adjusting the Display Contrast .......................................................................................... 7
4.2
Resetting the LCD module .................................................................................................. 7
4.3
Display Commands ............................................................................................................. 8
5. Design and Handling Precaution ......................................................................................... 12
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LCD Module User Manual
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1. Basic Specifications
1.1 Display Specifications
1) LCD Display Mode
: FSTN, Positive,Transflective
2) Display Color
: Display Data = “1” : Light Gray(*1)
: Display Data = “0” : Dark Blue (*2)
3) Viewing Angle
: 6H
4) Driving Method
: 1/128 duty, 1/12 bias
5) Backlight
: 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
*3. Fine Contrast adjustment function is necessary in the application design for optimal display result
1.2 Mechanical Specifications
1) Outline Dimension
: 144.0 x 104.0 x 11.2mm
(See attached Outline Drawing for details)
1.3 Block Diagram
BLA
BLK
Backlight Circuit
LCD Panel
240 × 128Pixels
VDD, VSS
DB0~DB7
UC1698 or equivalent
/CS, /RST, RS, /WR, /RD
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1.4 Terminal Functions
K1
PIN
Pin No.
Name
I/O
Descriptions
1
FG
-
Frame Ground
2
VSS
Power 0V Power Supply, GND
3
VDD
Power Positive power supply
4
NC
-
No connection
5
/WR=L  H, /RD=H;
/WR
Input
Data or Instruction latch into the LCD module
6
/WR=H, /RD=L;
/RD
Input
Data or Status read form the LCD module
7
Chip Select
/CS
Input
/CS=L, enable access to the LCD module
/CS=H, disable access to the LCD module
8
Register Select
RS
Input RS= H, Transferring the Display Data
RS = L, Transferring the Control Data
9
NC
-
No connection
Reset signal
10
/RST
Input /RST = L, Initialization is executed
/RST = H, Normal running.
11
8-bit Data bus;
DB0
Three state I/O terminal for display data or instruction data
…
…
I/O
when /CS=H,
17
DB6
DB0~DB7=High Impedance
18
DB7
19
NC
-
No connection
20
NC
-
No connection
21
BLA
Power Positive power for LED backlight
22
BLK
Power Negative power for LED backlight
23
BLA
Power Positive power for LED backlight
24
NC
-
No connection
25
BLK
Power Negative power for LED backlight
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2. Absolute Maximum Ratings
Items
Symbol
Min.
Max.
Unit Condition
Supply Voltage
V DD
-0.3
+3.6
V
V SS = 0V
Input Voltage
V IN
-0.3
V DD +0.3
V
V SS = 0V
Operating Temperature
T OP
-25
+70
 C
No Condensation
Storage Temperature
T ST
-35
+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
V SS =0V, V DD =3.0V, T OP =25  C
Items
Symbol
MIN.
TYP.
MAX.
Unit
Condition /
Application Pin
Operating Voltage
V DD
2.7
3.0
3.3
V
VDD
Input High Voltage
V IH
0.8xV DD
-
V DD
V
/RST, CS, RS,
Input Low Voltage
V IL
V SS
-
0.2xV DD
V
DB0~DB7, /RD, WR
Operating Current
I DD
-
1.6
13.3
mA
VDD
3.2 LED Backlight Circuit Characteristics
VSS=0V, If BLA =85mA, T OP =25  C
Items
Symbol
MIN.
TYP.
MAX.
Unit
Applicable Pin
Forward Voltage
Vf BLA
-
3.3V
-
V
BLA
Forward Current
If BLA
-
85
102
mA
BLA
Cautions:
Exceeding the recommended driving current could cause substantial damage to the backlight and shorten its lifetime.
BLA
BLK
No. of LED = 6pcs
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3.3 AC Characteristics
3.3.1 8080 Mode System Bus Timing
V SS =0V, V DD =3.0V, T OP =25  C
Item
Symbol
MIN.
TYP.
MAX.
Unit
Address setup time (CD)
tas80
5
-
-
ns
Address hold time (CD)
tah80
5
-
-
ns
System cycle time (8bit)
tcy80
145
-
-
ns
Read pulse width
tpwr80
107
-
-
ns
Write pulse width
tpww80
65
-
-
ns
High pulse width (read)
thpw80
63
-
-
ns
High pulse width (write)
thpw80
67
-
-
ns
Data setup time
tds80
38
-
-
ns
Data hold time
tdh80
5
-
-
ns
Data access time
tacc80
-
-
75
ns
Data output disable time
tod80
15
-
38
ns
Chip select setup time
tcssa80
7
-
-
ns
Chip select hold time
tcsh80
7
-
-
ns
Note:
*1. Input signal rise/fall time should be less than 15ns .
*2. CL=100pF
*3.All timing is using 20% and 80% of VDD as the reference.
3.3.2 Reset Timing
V SS =0V, V DD =3.0V, T OP =25  C
Item
Symbol
MIN.
TYP.
MAX.
Unit
Reset LOW pulse width
trw
4
-
-
Internal Resetting time
trd
13
ms
Note:
*1.All timing is using 20% and 80% of VDD as the reference.
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4. Function specifications
4.1 Adjusting the Display Contrast
This LCD module equipped with latest digital contrast adjustment function.
Its display contrast could be adjusted by MCU command.
(please see the command tables for details)
It is recommended to provide a contrast adjustment interface for end-user,
where the best display result could meet the individual preference in mass production.
4.2 Resetting the LCD module
The LCD module should be initialized by using /RST terminal.
While turning on the VDD and VSS power supply, maintain /RST terminal at LOW level. After the
power supply stabilized, release the reset terminal (/RST=HIGH)
4.2.1 Display Memory Map
ROW
no.
LCD Display (front view)
1 st
2 nd
3 rd
:
240 x 128 pixels
126 th
127 th
128 th
Column no.
1 st
2 nd
3 rd
4 th
5 th
6 th
238 th 239 th 240 th 241 th 242 th
Column Address
00h
01h
4fh
50h
Note:
*1. This mono LCM is driven by a color LCD driver.
Every three dots are being driven by R G B segment driver.
*2. The above is based on:
- 4R4G4B setting, each dot will be driven by 4bit; LC[7:6]=0:1, DC[4]=1
- Mirror Y direction; LC[2]=1
- Normal X direction; LC[1]=0
- Color Mapping as RGB; LC[5]=1
*3. For details please refer to UC1698 datasheet
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4.3 Display Commands
The LCD module contains register, which control the operation. These register can be modified by commands.
The following table is a summary of the control registers, their meaning and their default value.
4.3.1 Register Table
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Register Table (continue)
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Register Table (continue)
Note: Please refer to UC1698 data sheet for details
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4.3.2 Command Table
The following is the list of host command supported.
Note:
Please refer to UC1698 data sheet for details
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5. Design and Handling Precaution
Please refer to "LCD-Module-Design-Handling-Precaution.pdf".
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