OSD2002-2 - OSD Displays

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310 Genius Drive

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OSD2002-2

PLED 20x2 Character Module Specifications

PLED 20x2 Character Module OSD2002-2 Specification

1. Features

1. 2 lines of 20 characters of 5x8 (dots)

2. Low power consumption

3. High contrast ratio and wide viewing angle

4. Compatible with LCD 20x2 type

5. Controller is compatible with HD44780

6. 4-bits or 8-bit MPU interface

7. High speed MPU interface:2 MHz(VDD=5V)

8. 80x8 bit Display RAM(80 characters max.)

2. Absolute maximum ratings

Symbol Parameter Min Typ Max

Unit

VDD Supply voltage for Logic 4.5 5.0 5.5 V

Topr Operating temperature -20 25 60

o

C

Tstg Storage temperature -30 70

o

C

Vbt Brightness control voltage 3 V

Tsolder Soldering Temperature 260 for 5 seconds

Pd Module power consumption

@Vbt=3V VDD=5V

50 80 130 mW

Operating Storage Item

Min. Max.

Min.

Max.

Ambient

Temperature

-20

o

C

60

o

C

-

30

o

C 70

o

C

Humidity 40

o

C 90%RH 40

o

C 90%RH

Corrosive gas Not Acceptable

Not Acceptable

3 Electrical Characteristics

3.1 DC Electrical Characteristics

(Ta= -20C to 50C)

Item Symbol

Condition Min Typ

Max Unit

Power supply voltage VDD 4.5 5.5 V

Brightness control voltage VBT 3 V

Power supply current Icc VDD=5V, (Logical only ) 0.35

0.6 mA

High level input voltage Vih 0.7VDD

VDD V

Low level input voltage Vil -0.3 0.55 V

Leakage current Il -1 1 uA

3.2 AC Electrical Characteristics

(Ta= -20C to 50C)

Write operation

Item Symbol Min Typ Max Unit

Enable Cycle Time Tcyc 500 ns

Enable Pulse Width (High level) Pweh 230 ns

Enable Rise/ Fall Time tEf, tEr 20 ns

Address Set-up Time tAS 40 ns

Address Hold Time tAH 10 ns

Data Set-up Time tDSW 80 ns

Data Hold Time tH 10 ns

Read operation

Item Symbol Min Typ Max Unit

Enable Cycle Time Tcyc 500 ns

Enable Pulse Width (High level) Pweh 230 ns

Enable Rise/ Fall Time tEf, tEr 20 ns

Address Set-up Time tAS 40 ns

Address Hold Time tAH 10 ns

Data Delay Time tDDR 160 ns

Data Hold Time tH 5 ns

3.3 Timing Chart

Write operation

RS

R/W

D0~D7

E

tAS Pweh tAH

tEf tH

tEr tDSW

Tcyc

Read operation

E

tEf

Tcyc

tAH

D0~D7

tDDR

R/W

RS

Pweh

tEr

tH

tAS

3.4 Display Data RAM (DDRAM)

The Display Data RAM (DDRAM) is used to store the Display Data that is represented

as 8-bit character code. The Display Data RAM supports an extended capacity of 80 x

8-bits or 80 characters.

00

01

02

03

04

05

22

23

24

25

26

27

DDRAM

Address (Hex)

40

41

42

43

44

45

……

62

63

64

65

66

67

To illustrate, for 2-line x 20 characters display, the relationship between the DDRAM

address and position of the PLED panel is shown below.

Display

Position

1 2 3 4 5 6 7 8 9 10

11

12

13

14

15

16

17

18

19

20

00

01

02

03

04

05

06

07

08

09

0A

0B

0C

0D

0E

0F

10

11

12

13

DDRAM

Address 40

41

42

43

44

45

46

47

48

49

4A

4B

4C

4D

4E

4F

50

51

52

53

For shift left

01

02

03

04

05

06

07

08

09

0A

0B

0C

0D

0E

0F

10

11

12

13

14

DDRAM

Address 41

42

43

44

45

46

47

48

49

4A

4B

4C

4D

4E

4F

50

51

52

53

54

For shift right

27

00

01

02

03

04

05

06

07

08

09

0A

0B

0C

0D

0E

0F

50

51

52

DDRAM

Address 67

40

41

42

43

44

45

46

47

48

49

4A

4B

4C

4D

4E

50

51

52

53

3.5 Correspondence between character codes and char patterns

Standard Font Table

Optional Cyrillic Font Table

3.6 Instruction set

Code Instruction

RS

R/

W

D7 D6 D5 D4 D3 D2 D1 D0

Description

Execution

time

Clear

Display

0 0 0 0 0 0 0 0 0 1 Clear entire display. Sets DDRAM

address 0 into address counter

1.52ms

Entry mode

set

0 0 0 0 0 0 0 1 I/D S Sets cursor move direction and

specifies display shift

37us

Display

On/Off

control

0 0 0 0 0 0 1 D C B Sets entire display (D) On/Off

Sets cursor (C) On/Off

Sets Blinking (B) of cursor position

character

37us

Cursor/displ

ay shift

0 0 0 0 0 1 S/C R/L X X Moves cursor & shifts display without

changing DDRAM contents

37us

Function set

0 0 0 0 1 DL N F X X Sets interface data length (DL)

Sets number of display lines (N)

Sets character font (F)

37us

Set CGRAM

address

0 0 0 1 ACG

ACG

Sets CGRAM address.

CGRAM data is sent and received

after this setting.

37us

Set DDRAM

address

0 0 1 ADD

ADD

Sets DDRAM address.

The DDRAM data bus sent and

received after this setting

37us

Read busy

flag &

address

0 1 BF AC AC AC AC AC AC AC Reads busy flag (BF) indicating that

internal operation is being performed

Reads address counter contents

0us

Write data

into the

CGRAM or

DDRAM

1 0 Write data Write data into the CGRAM or

DDRAM

37us

Read data

into the

CGRAM or

DDRAM

1 1 Read data Read data from the CGRAM or

DDRAM

37us

I/D =1: Increment I/F=0:Decrement

S =1: Display shift on

D =1: Display on

C =1: Cursor display on

B =1: Cursor blink on

S/C =1: Shift display S/C=0: Move cursor

R/L =1: Shift right R/L=0:Shift left

DL =1: 8-bit DL=0:4-bit

N =1:Dual line N =0:Single line

F =1:5x10 dots F =0:5x8 dots

BF =1:Internal operation

BF =0:Ready for instruction

DDRAM: Display Data RAM

CGRAM: Character Generator RAM

ACG: Character Generator RAM

Address

ADD: Display Data RAM Address

AC: Address Counter

3.7 Initialization via Instruction

8-BIT INTERFACE

The following procedures are followed during the initialization of an 8-bit MPU

Power ON

WAIT FOR MORE THAN 15ms AFTER THE VDD RISES TO 4.5V

RS

R/W DB7

DB6 DB5 DB4 DB3 DB2 DB1 DB0

BF CANNOT BE CHECKED BEFORE THIS

0 0 0 0 1 1 * * * *

INSTRUCTION.

FUNCTION SET (INTERFACE IS 8 BITS

WAIT FOR MORE THAN 4.1ms

LONG)

RS

R/W DB7

DB6 DB5 DB4 DB3 DB2 DB1 DB0

BF CANNOT BE CHECKED BEFORE THIS

0 0 0 0 1 1 * * * *

INSTRUCTION.

FUNCTION SET (INTERFACE IS 8 BITS

WAIT FOR MORE THAN 100 us

LONG)

RS

R/W DB7

DB6 DB5 DB4 DB3 DB2 DB1 DB0

BF CANNOT BE CHECKED BEFORE THIS

0 0 0 0 1 1 * * * *

INSTRUCTION.

FUNCTION SET (INTERFACE IS 8 BITS

LONG)

BF CAN BE CHECKED AFTER THE

FOLLOWING INSTRUCTIONS. WHEN BF IS

NOT CHECKED, THE WAITING TIME

BETWEEN THE INSTRUCTIONS IS

LONGER THAN THE EXECUTION TIME OF

THE INSTRUCTION

RS

R/W DB7

DB6 DB5 DB4 DB3 DB2 DB1 DB0

END OF INITIALIZATION

0 0 0 0 1 1 N F * *

FUNCTION SET (INTERFACE IS 8 BITS

0 0 0 0 0 0 1 0 0 0

LONG) SPECIFY THE NUMBER OF

0 0 0 0 0 0 0 0 0 1

DISPLAY LINES AND CHARACTER FONT)

0 0 0 0 0 0 0 1 I/D S

THE NUMBER OF CHARACTER LINES AND

CHARACTER FONT CANNOT BE

CHANGED AFTER THIS POINT.

DISPLAY OFF

END OF INITIALIZATION

DISPLAY CLEAR

ENTRY MODE

4-BIT INTERFACE

The following procedures are followed during the initialization of a 4-bit MPU

Power ON

WAIT FOR MORE THAN 15ms AFTER

THE VDD RISES TO 4.5V

RS R/W DB7 DB6 DB5 DB4

BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION.

0 0 0 0 1 1

FUNCTION SET (INTERFACE IS 8 BITS LONG.)

WAIT FOR MORE THAN 4.1ms

RS R/W DB7 DB6 DB5 DB4

BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION.

0 0 0 0 1 1

FUNCTION SET (INTERFACE IS 8 BITS LONG.)

WAIT FOR MORE THAN 100 us

RS R/W DB7 DB6 DB5 DB4

BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION.

0 0 0 0 1 1

FUNCTION SET (INTERFACE IS 8 BITS LONG.)

RS R/W DB7 DB6 DB5 DB4

BF CAN BE CHECKED AFTER THE FOLLOWING INSTRUCTIONS.

0 0 0 0 1 0

WHEN THE BF IS NOT CHECKED, THE WAITING TIME BETWEEN

0 0 0 0 1 0

THE INSTRUCTIONS IS LONGER THAN THE TIME IT TAKES FOR

0 0 N F * *

THE INSTRUCTION TO BE EXECUTED.

0 0 0 0 0 0

FUNCTION SET (SET INTERFACE IS 4 BIT LONG)

0 0 1 0 0 0

INTERFACE IS 8 BITS LONG

0 0 0 0 0 0

FUNCTION SET (INTERFACE IS 4 BIT LONG. SPECIFY THE

0 0 0 0 0 1

NUMBEROF DISPLAY LINES AND CHARACTER FONT).

0 0 0 0 0 0

THE NUMBER OF DISPLAY LINES AND CHARACTER FONT

0 0 0 1 I/D S

CANNOT BE CHANGED AFTER THIS POINT.

DISPLAY OFF

DISPLAY CLEAR

END OF INITIALIZATION

END OF INITIALIZATION ENTRY MODE SET

3.8 Block Diagram

VSS

VBT

RS

R/W

E

D0~D7

VDD

Controller

&

Driver

40

16

60

PLED PANEL

20Char x 2Line

Driver

4 Interface Pin Function

No. Symbol I/O

Function

1 VSS I Ground

2 VDD I Power supply for logic

3 VBT I Brightness adjustment

4 RS I H: Data

L: Instruction code

5 R/W I H: Read

L: Write

6 E I HL: Enable

7 D0 I

8 D1 I

9 D2 I

10 D3 I

11 D4 I

12 D5 I

13 D6 I

14 D7 I

Data bus

6 Physical specifications

6.1 Mechanical specifications

NO.

Item Specification Unit

1 Active display area 73.45x11.4 mm

2 Viewing area 79.0x17.0 mm

3 Module dimension 113.0x41.4x9.6 mm

4 Dot size 0.5x0.65 mm

5 Weight 34 g

6.2 Drawing

7 Optical specifications

Item Condition

Min.

Typ.

Max.

Unit

Rise - - 10 us Response time

Fall - - 10 us

Contrast ratio 100 lux 100 - -

Top - 80 - deg

Bottom

- 80 - deg

Left - 80 - deg

Viewing angle

right - 80 - deg

Brightness With

polarizer

30 40 50 nits

Color - YG

1

-

Note 1. YG.= yellow green

8 Reliability test items

NO.

Test items Conditions

1 High temperature storage

70

o

C , 240 hrs

2 Low temperature storage -30

o

C,240 hrs

3 High temperature

operation

60

o

C,240 hrs

4 Low temperature

operation

-20

o

C, 240 hrs

5 High temperature and

high humidity storage test

40

o

C, 90% RH, 240 hrs

6 Thermal shock test -20

o

C → 60

o

C

，

20 cycles

9 Application Note

(1) Ref. Circuit

(2) Ref. Programming

'---------------------------------------------------------------------------------

'It is an OSD2002-2 pattern program and shows A,B,C….on module.

'Here use BASCOM-AVR compile.

'---------------------------------------------------------------------------------

' Project name : 20x2 character module

' file name : demo2002.bas

' MCU : AVR AT90S8515

' Xtal : 8MHz

' Panel I/F : RS, RW, Enable, BTV

' Writer : Cheng-Nan Yeh

' Date : Dec.26, 2002 rev:A

'-----------------------------------------------

' DB0=PA0: DB1=PA1: DB2=PA2: DB3=PA3

' DB4=PA4: DB5=PA5: DB6=PA6: DB7=PA7

' RS=PB2: RW=PB1: Enable=PB0

'-----------------------------------------------

'-------------initial setting

$regfile = "8515DEF.DAT"

Config Porta = Output

Config Portb = Output

Dim J As Integer , Cara As Byte , I As Byte

Dim Command_diable As Byte, Command_enable As Byte

Dim Command_write_data As Byte , Command_clear_display As Byte

Dim Command_move_right As Byte , Command_display_on As Byte

Dim Command_line2_char5x7 As Byte , Command_ddram_&H00 As Byte

Dim Command_ddram_&H40 As Byte , Write_char As Byte

'---------

Command_diable = &H00

Command_enable = &H01

Command_clear_display = &H01

Command_move_right = &H1D

Command_display_on = &H0C

Command_line2_char5x7 = &H38

Command_ddram_&H00 = &H80

Command_ddram_&H40 = &HC0

Command_write_data = &H05

Write_char = &H40

'---------

C = 1

I = 0

'-------------clear module display and cursor back home

Portb = Command_enable 'RS=0, RW=0, Enable=1

Porta = Command_clear_display

Waitus 500 'wait 500uS for MCU internal delay time

Portb = Command_diable 'You need to set PB0=0 after PB0=1 for MCU.

'-------------setting S/C, R/L, I/D, S

Portb = Command_enable

Porta = Command_move_right 'S/C=1 ,R/L=1 ,I/D=0, S=1

Waitus 500

Portb = Command_diable

'--------------display on / off

Portb = Command_enable

Porta = Command_display_on 'D=1, C=0, B=0

Waitus 500

Portb = Command_diable

'--------------setting 5x7 Char. 2-Line

Portb = Command_enable

Porta = Command_line2_char5x7 'DL=1, N=1, F=0

Waitus 500

Portb = Command_diable

'-----------------------------------------------

''--------fill in any data to module

''--------------setting DDRAM address &H00

For J = 1 To 20 Step 1

Portb = Command_enable

Porta = Command_ddram_&H00 + I 'set address is &H00

Waitms 10 ' and next one

Portb = Command_diable

'-------write data up

Portb = Command_write_data

Porta = Write_char + C 'write Char. is "A" and next one.

Waitms 10

Portb = Command_diable

Cara = Cara + 1

'--------------setting DDRAM address &H40

Portb = Command_enable

Porta = Command_ddram_&H40 + I 'set address is &H40

Waitms 10 ' and next one

Portb = Command_diable

'-------write data down

Portb = Command_write_data

Porta = Write_char + C 'write Char. is "B" and next one.

Waitms 10

Portb = Command_diable

'---------

C = C + 1

I = I + 1

If I = 20 Then I = 0 'if DDRAM address is end then come back &H00.

If C = 40 Then C = 0

Next J

'---------------end program

End

Download free BASCOM-AVR DEMO compiler from http://www.mcselec.com/

10 Precaution in Design

(1) Please do not put mechanical stress on the module. Mechanical stress will cause

damage to the metal, plastic, and PLED panel.

(2) The polarizer is easily scratched and should be carefully handled. Please do not touch

the polarizer with hard materials, such as tweezers, pencil lead and glass. Please do not

touch it by.

(3) This module is easily damaged by static discharge, please be cautious of static electricity

and insure human body grounding.

(4) The Half-Brightness Decay Life will be longer than 10K hours when the module is

operated at room temp.