REVISIONS
REV. DESCRIPTION DATE APPROVED
These drawings and specifications are
the property of Densitron Corporation
and may not be reproduced, copied or
used without written permission
APPROVALS DATE
DRAWN
CHECKED
ISSUED
Unless otherwise
specified:
Dimensions are mm
Tolerances are:
X = ± 3
.X = ± 0.5
.XX = ± 0.05
DENSITRON CORPORATION
TORRANCE, CA
TITLE
SHEET 1 OF
8
DWG. NO. LM2302
1 LINE X 20 CHARACTERS LCD MODULE
-
E0317
1. Specification subject to change without notice.
2. All dimensions and specifications apply to standard modules. This information may vary for modules with optional
features.
3. All dimensions are in millimeters.
4. Precautions:These precautions apply equally to modules from all makers, not just Densitron. Violation of these
guidelines may void the warranty and can cause problems ranging from erratic operation to catastrophic display
failure.
Handling precautions:
♦ This device is susceptible to Electro-Static Discharge (ESD) damage. Observe Anti-Static precautions.
Power supply precautions:
♦ Identify and, at all times, observe absolute maximum ratings for both logic and LC drivers. Note that there is some
variance between models.
♦ Prevent the application of reverse polarity to VDD and VSS, however briefly.
♦ Use a clean power source free from transients. Power up conditions are occasionally “jolting” and may exceed the
maximum ratings of the module.
♦ The +5V power of the module should also supply the power to all devices which may access the display. Don’t
allow the data bus to be driven when the logic supply to the module is turned off.
♦ DO NOT install a capacitor between the VO (contrast) pin and ground. VDD must, at all times, exceed the VO
voltage level. The capacitor combines with the contrast potentiometer to form an R-C network which “holds-up” VO,
at power-down, possibly damaging the module.
Operating precautions:
♦ DO NOT plug or unplug the module when the system is powered up.
♦ Minimize the cable length between the module and host MPU. (Recommended max. length 30 cm).
♦ For models with EL backlights, do not disable the backlight by interrupting the HV line. Unloaded inverters produce
voltage extremes which may arc within a cable or at the display.
♦ Operate the module within the limits of the modules temperature specifications.
Mechanical / Environmental precautions:
♦ Improper soldering is the major cause of module difficulty. Use of flux cleaner is not recommended as they may
seep under the elastomeric connection and cause display failure. Densitron recommends the use of Kester “245”
no-clean solder.
♦ Mount the module so that it is free from torque and mechanical stress.
♦ Surface of LCD panel should not be touched or scratched. The display front surface is an easily scratched, plastic
polarizer. Avoid contact and clean only when necessary with soft, absorbent cotton dampened with petroleum
benzene.
♦ ALWAYS employ anti-static procedure while handling the module.
♦ Prevent moisture build-up upon the module and observe the environmental constraints for storage temperature and
humidity.
♦ DO NOT store in direct sunlight.
♦ If leakage of the liquid crystal material should occur, avoid contact with this material, particularly ingestion. If the
body or clothing becomes contaminated by the liquid crystal material, wash thoroughly with water and soap.
Notes: (unless otherwise specified)
SHEET OF
DWG. NO. LM2302 REV. -
1.0 DESCRIPTION
Dot matrix display module consisting of a Liquid Crystal Display, CMOS driver and controller LSI, printed
circuit board and metal support frame.
Available LC fluids types are: NTN (supertwisted nematic), NTN-H (extended temperature range NTN).
Options include electroluminescent (EL) backlighting and/or on-board negative voltage generation.
2.0 MECHANICAL CHARACTERISTICS
Item Specifications Unit
Package Dimensions 180.0 (W) x 40.0 (H) x 12.8 max (D) mm
Display format 1 line x 20 characters -
Character font format 5 (W) x 7 (H) with attached cursor dots
Driving method 1/8 duty
Dot size 1.152 (W) x 1.765 (H) mm
Dot pitch 1.212 (W) x 1.825 (H) mm
Character Size 6.0 (W) x 14.54 (H) mm
Active display area 142.8 (W) x 14.54 (H) mm
Viewing area 149.0 (W) x 23.0 (H) mm
Weight g
Notes:W-Width;H-Height;D-Depth.
3.0 ABSOLUTE MAXIMUM RATINGS VSS=0V;Ta=25°C
Item Symbol TN, NTN TN-H, NTN-H Unit
Min.
Max.
Min.
Max.
Logic supply voltage VDD-VSS 0 7 0 7 V
LC driver supply voltage VDD-VO0 6 0 13 V
Operating temperature
Storage temperature (Note 1) TOP
TST 0
-20 +50
+70 -20
-30 +70 (Note 3)
+80 °C
Humidity: Operating (@40°C)
Non-operating (@40°C) -
--
-85%
95% -
-85%
95% RH (Note 2)
RH (Note 2)
Notes: 1: Tested to 100 hrs.
2: Refers to non-condensing conditions.
3. It is not recommended to operate EL lamp above 50°C.
4.0 ELECTRICAL CHARACTERISTICS VDD=5±0.25V;Ta=25°C
Item Symbol Test Condition Min. Typ. Max. Unit
Input “High” voltage VIH -2.2 -VDD V
Input “Low” voltage VIL -- - 0.6 V
Output “High” voltage VOH IOH=0.205mA 2.4 - - V
Output “Low” voltage VOL IOL=1.2mA - - 0.4 V
Power supply current IDD VDD=5.0V -3-mA
SHEET 3 OF 8
DWG. NO. LM2302 REV.-
5.0 RECOMMENDED LC DRIVE VOLTAGE (VDD-VO)VDD=5.0±0.25V
Temperature TN TN-H NTN NTN-H
Ta= -20°C - - - 7.4
Ta= 0°C - - 4.9 7.1
Ta= 25°C - - 4.5 6.6
Ta= 50°C - - 4.2 6.3
Ta=70°C - - - 6.1
6.0 BACKLIGHT SPECIFICATIONS: Ta=20°C,60%RH,Darkroom.
Item Symbol Typ. Max. Unit
EL lamp input voltage VEL 100 150 Vrms
EL lamp input current IEL 13.0 20.0 mA
EL lamp input frequency FEL 400 800 Hz
Life to half initial brightness -2500 3000 Hours
Recommended backlight inverter -DAS5V7A --
7.0 POWER SUPPLY
V
VV
V
DD
OR
SS
L
C
D
+5V
-5V
V
VV
V
DD
OR
SS
L
C
D+5V
TN-H,NTN-HTN,NTN
V=10K-20KohmR
9.0 BLOCK DIAGRAM:
SHEET OF
DWG. NO. LM2302 REV. -
8.0 INTERFACE DESCRIPTION
Pin No. Symbol I/O Function
1VSS -Ground (0V)
2VDD -Logic Supply Voltage (+5V)
3VO-LC Drive voltage for contrast adjustment
4RS IRegister Select 0: Instruction Register
1: Data Register
5R/W IRead / Write 0: Data Write (Module MPU)
1: Data Read (Module MPU)
6EIEnable Signal Active High (H L)
7DB0 I/O Bi-directional data bus line 0
8DB1 I/O Bi-directional data bus line 1
9DB2 I/O Bi-directional data bus line 2
10 DB3 I/O Bi-directional data bus line 3
11 DB4 I/O Bi-directional data bus line 4
12 DB5 I/O Bi-directional data bus line 5
13 DB6 I/O Bi-directional data bus line 6
14 DB7 I/O Bi-directional data bus line 7
15 N/C(VEE)- (O) No connection (Negative voltage output for models with
on-board negative voltage generators)
16 N/C -No connection
BL1 VEL -EL backlight input voltage (from output of DC-AC inverter)
BL2 VEL -EL backlight input voltage (from output of DC-AC inverter)
H
D
4
4
7
8
0
LCD PANEL
BACKLIGHT
8
E
R/W
RS
DB0~
DB7
BL1
B
L
2
VO
VDD
VSS
40 40
16
4DRIVER
SHEET OF
DWG. NO. LM2302 REV. -
10.0 TIMING CHARACTERISTICS
Item Symbol Min. Typ. Max. Unit
Enable cycle time TcycE 500 - - nS
Enable pulse width PWEH 230 - - nS
Enable rise / fall time tEr/tEf - - 20 nS
Address set-up time tAS 40 - - nS
Address hold time tAH 10 - - nS
Data delay time tDDR - - 160 nS
Data hold time (Write) tDHW 10 - - nS
Data hold time (Read) tDHR 5- - nS
Data set-up time tDSW 80 - - nS
11.0 DD RAM ADDRESS vs. DISPLAY POSITION
Character 1 2 3 4 5 6 7 8 9 10 11 --- 18 19 20
Line 1 00 01 02 03 04 05 06 07 08 09 0A --- 11 12 13
V
IL
PW
EH
V
IL
V
IL
V
IH
t
DSW
t
H
t
AH
tcycE
t
Er
t
Ef
t
AS tAH
V
IL
V
IH
V
IL
V
IL
V
IL
V
IL
V
IH
V
IH
V
IH
V
IL
V
IH
RS
E
DB0
to
DB7
R/W
Valid
Data
PW
EH
V
IH
V
IH
V
IL
V
IH
t
DDR
t
DHR
t
AH
tcycE
t
Er
t
Ef
t
AS tAH
V
IL
V
IH
V
IL
V
IL
V
IL
V
OL
V
OL
V
IH
V
IH
V
OH
V
OH
RS
E
DB0
to
DB7
R/W
Valid
Data
READ OPERATION
WRITE OPERATION
SHEET OF
DWG. NO. LM2302 REV. -
12.0 OPTICAL CHARACTERISTICS
Item Symbol Test Condition Min. Typ. Max. Unit
Contrast ratio TN, TN-H KØ=20° θ=0° 3- - -
Contrast ratio NTN KØ=20° θ=0° 4- - -
Contrast ratio NTN-H KØ=20° θ=0° 5- - -
Viewing angle TN, TN-H Ø2-Ø1
θθ=0° K>1.4
Ø=20° K=1.4 20
±30 -
--
-Deg.
Deg.
Viewing angle NTN Ø2-Ø1
θθ=0° K>1.4
Ø=20° K=1.4 40
±30 -
--
-Deg.
Deg.
Viewing angle NTN-H Ø2-Ø1
θθ=0° K>1.4
Ø=20° K=1.4 40
±40 -
--
-Deg.
Deg.
Response time Rise
Fall tr
tfØ=20° θ=0°
Ø=20° θ=0° -
-150
150 250
250 mS
mS
1.4
Ø1 Ø2
NTN, NTN-H: Ø1 < 0° < Ø2
TN, TN-H: Ø1 < 20° < Ø2
Viewing angle
Contrast ratio
Brightness
B2
B1
Driving voltage
Selected dot
Non-selected
dot
XX'
Ø2
Ø1
Y
Y'
Brightness of non-selected dots
Brightness of selected dots
K =
DEFINITION OF CONTRAST RATIO (K) CONTRAST VERSUS VIEWING ANGLE
DEFINITION OF ANGLES Ø AND
100%
90%
10%
tr tf
Brightness
Selected Non-selected
Non-selected
DEFINITION OF OPTICAL RESPONSE
θθ
θθ
4.0±0.2
5.9±0.3
±0.3
2.54X7
32.0±0.2
37.0±0.3
40.0±0.5
2.5±0.3
4.0±0.2
4.5±0.3
8.38±0.2
4-Ø3.5 HOLE
12.4±0.3
172.0±0.2
162.0±0.3
149.0±0.3
142.8
2.5
5.08 17.46
23.0
=17.78
16 15
21
1.2
6.0
1.152
0.06
0.06
1.765
14.54
180.0±0.5
1.6±0.2
2-Ø1.0 Hole
BL1
BL2
Max 5.6
7.6
Max 5.2
16-Ø1.0 HOLE (NOTE1)
SHEET OF
DWG. NO. LM2302 REV. -
13.0 MODULE DIMENSIONS
8
7
SHEET OF
DWG. NO. LM2302 REV. -
14.0 PART NUMBER DESCRIPTION FOR AVAILABLE OPTIONS
LM2302 1C20
Polarizer Type
A = Reflective: light background, no backlight
B = Transflective: light background with blue-green EL backlight
Not applicable - LEAVE BLANK
Fluid Type and Power Supply
S = NTN with +5VDC operation
H = NTN-H with ±5VDC operation
W = NTN-H fluid with +5VDC operation (on-board negative voltage generation)
Fluid Type
N = NTN, NTN-H
Background Color for NTN Fluid
G = Gray background
Y = Yellow background