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One Stop Displays 310 Genius Drive Winter Park, FL 32789 407-629-0500 sales@onestopdisplays.net
OSD2002-2
PLED 20x2 Character Module Specifications
PLED 20x2 Character Module OSD2002-2 Specification
1.
Features 1. 2. 3. 4. 5. 6. 7. 8. 2 lines of 20 characters of 5x8 (dots) Low power consumption High contrast ratio and wide viewing angle Compatible with LCD 20x2 type Controller is compatible with HD44780 4-bits or 8-bit MPU interface High speed MPU interface:2 MHz(VDD=5V) 80x8 bit Display RAM(80 characters max.)
2. Absolute maximum ratings Symbol VDD Topr Tstg Vbt Tsolder Pd Parameter Supply voltage for Logic Operating temperature Storage temperature Brightness control voltage Soldering Temperature Module power consumption @Vbt=3V VDD=5V Operating Min. Max. -20oC 60oC Min 4.5 -20 -30 Typ 5.0 25 Max 5.5 60 70 Unit V o C o C V
3 260 for 5 seconds 50 80 130 mW
Item Ambient Temperature Humidity Corrosive gas
Storage Min. Max. -30oC 70oC
40oC 90%RH 40oC 90%RH Not Acceptable Not Acceptable
3
Electrical Characteristics 3.1 DC Electrical Characteristics (Ta= -20C to 50C)
Item Power supply voltage Brightness control voltage Power supply current High level input voltage Low level input voltage Leakage current Symbol Condition VDD VBT Icc VDD=5V, (Logical only ) Vih Vil Il Min 4.5 Typ 3 0.35 0.7VDD -0.3 -1 Max 5.5 0.6 VDD 0.55 1 Unit V V mA V V uA
3.2 AC Electrical Characteristics (Ta= -20C to 50C) Write operation
Item Enable Cycle Time Enable Pulse Width (High level) Enable Rise/ Fall Time Address Set-up Time Address Hold Time Data Set-up Time Data Hold Time Symbol Tcyc Pweh tEf, tEr tAS tAH tDSW tH Min 500 230 40 10 80 10 Typ Max Unit ns ns ns ns ns ns ns
20
Read operation
Item Enable Cycle Time Enable Pulse Width (High level) Enable Rise/ Fall Time Address Set-up Time Address Hold Time Data Delay Time Data Hold Time Symbol Tcyc Pweh tEf, tEr tAS tAH tDDR tH Min 500 230 40 10 160 5 Typ Max Unit ns ns ns ns ns ns ns
20
3.3 Timing Chart Write operation
RS
tAS Pweh tAH
R/W
tEf tH
E
tEr tDSW
D0~D7
Tcyc
Read operation
RS
tAS Pweh tAH
R/W
tEf tH
E
tEr tDDR
D0~D7
Tcyc
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 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Position DDRAM 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 Address 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 For shift left DDRAM 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 Address 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 For shift right DDRAM 27 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 50 51 52 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 Instruction
RS R/ D7 W Clear Display Entry mode set Display On/Off control Cursor/displ ay shift Function set
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Code
D6 D5 D4 D3 D2 D1 D0
0 0 0 0 0 1 0 1 D 0 I/D C 1 S B
Description
Clear entire display. Sets DDRAM address 0 into address counter Sets cursor move direction and specifies display shift Sets entire display (D) On/Off Sets cursor (C) On/Off Sets Blinking (B) of cursor position character Moves cursor & shifts display without changing DDRAM contents
Execution time
1.52ms 37us 37us
0 0
0 0 0
0 0 0
0 0
0 1
1 DL
S/C R/L N F
X X
X X
37us 37us 37us 37us
Set CGRAM 0 address Set DDRAM 0 address Read busy flag & address Write data into the CGRAM or DDRAM Read data into the CGRAM or DDRAM
0
0
1
Sets interface data length (DL) Sets number of display lines (N) Sets character font (F) 1 ACG ACG ACG ACG ACG ACG Sets CGRAM address. CGRAM data is sent and received after this setting. ADD ADD ADD ADD ADD ADD ADD Sets DDRAM address. The DDRAM data bus sent and received after this setting AC AC AC AC AC AC AC Reads busy flag (BF) indicating that internal operation is being performed Reads address counter contents Write data into the CGRAM or DDRAM
1
BF
0us
1
0
Write data
37us
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 0 0
DB7 0
DB6 0
DB5 1
DB4 1
DB3 *
DB2 *
DB1 *
DB0 *
BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION. FUNCTION SET (INTERFACE IS 8 BITS
WAIT FOR MORE THAN 4.1ms
LONG)
RS R/W 0 0
DB7 0
DB6 0
DB5 1
DB4 1
DB3 *
DB2 *
DB1 *
DB0 *
BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION. FUNCTION SET (INTERFACE IS 8 BITS
WAIT FOR MORE THAN 100 us
LONG)
RS R/W 0 0
DB7 0
DB6 0
DB5 1
DB4 1
DB3 *
DB2 *
DB1 *
DB0 *
BF CANNOT BE CHECKED BEFORE THIS 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 0 0 0 0 0 0 0 0 DB7 0 0 0 0 DB6 0 0 0 0 DB5 1 0 0 0 DB4 1 0 0 0 DB3 N 1 0 0 DB2 F 0 0 1 DB1 * 0 0 I/D DB0 * 0 1 S END OF INITIALIZATION FUNCTION SET (INTERFACE IS 8 BITS LONG) SPECIFY THE NUMBER OF DISPLAY LINES AND CHARACTER FONT) 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 0
R/W 0
DB7 0
DB6 0
DB5 1
DB4 1
BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION. FUNCTION SET (INTERFACE IS 8 BITS LONG.)
WAIT FOR MORE THAN 4.1ms
RS 0
R/W 0
DB7 0
DB6 0
DB5 1
DB4 1
BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION. FUNCTION SET (INTERFACE IS 8 BITS LONG.)
WAIT FOR MORE THAN 100 us
RS 0
R/W 0
DB7 0
DB6 0
DB5 1
DB4 1
BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION. FUNCTION SET (INTERFACE IS 8 BITS LONG.)
RS 0 0 0 0 0 0 0 0 0
R/W 0 0 0 0 0 0 0 0 0
DB7 0 0 N 0 1 0 0 0 0
DB6 0 0 F 0 0 0 0 0 1
DB5 1 1 * 0 0 0 0 0 I/D
DB4 0 0 * 0 0 0 1 0 S
BF CAN BE CHECKED AFTER THE FOLLOWING INSTRUCTIONS. WHEN THE BF IS NOT CHECKED, THE WAITING TIME BETWEEN THE INSTRUCTIONS IS LONGER THAN THE TIME IT TAKES FOR THE INSTRUCTION TO BE EXECUTED. FUNCTION SET (SET INTERFACE IS 4 BIT LONG) INTERFACE IS 8 BITS LONG FUNCTION SET (INTERFACE IS 4 BIT LONG. SPECIFY THE NUMBEROF DISPLAY LINES AND CHARACTER FONT). THE NUMBER OF DISPLAY LINES AND CHARACTER FONT CANNOT BE CHANGED AFTER THIS POINT. DISPLAY OFF DISPLAY CLEAR
END OF INITIALIZATION
END OF INITIALIZATION ENTRY MODE SET
3.8 Block Diagram
VDD VSS VBT RS R/W E D0~D7 Controller & Driver 40 16
PLED PANEL 20Char x 2Line
60
Driver
4
Interface Pin Function Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol VSS VDD VBT RS R/W E D0 D1 D2 D3 D4 D5 D6 D7 I/O I I I I I I I I I I I I I I Function Ground Power supply for logic Brightness adjustment H: Data L: Instruction code H: Read L: Write H L: Enable
Data bus
6
Physical specifications 6.1 Mechanical specifications NO. Item 1 Active display area 2 Viewing area 3 Module dimension 4 Dot size 5 Weight 6.2 Drawing Specification 73.45x11.4 79.0x17.0 113.0x41.4x9.6 0.5x0.65 34 Unit mm mm mm mm g
7
Optical specifications Item Response time Contrast ratio Viewing angle Condition Min. Rise Fall 100 lux 100 Top Bottom Left right With 30 polarizer Typ. Max. Unit 10 us 10 us 80 - deg 80 - deg 80 - deg 80 - deg 40 50 nits YG1 -
Brightness Color
Note 1. YG.= yellow green
8
Reliability test items Test items NO. 1 High temperature storage 2 Low temperature storage 3 High temperature operation 4 Low temperature operation 5 High temperature and high humidity storage test 6 Thermal shock test Conditions 70 oC , 240 hrs -30 oC,240 hrs 60 oC,240 hrs -20 oC, 240 hrs 40oC, 90% RH, 240 hrs
9
Application Note (1) Ref. Circuit
-20 oC 60 oC
20 cycles
(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 Waitms 10 Portb = Command_diable '-------write data up Portb = Command_write_data Porta = Write_char + C Waitms 10 Portb = Command_diable Cara = Cara + 1 '--------------setting DDRAM address &H40 Portb = Command_enable Porta = Command_ddram_&H40 + I Waitms 10 Portb = Command_diable '-------write data down Portb = Command_write_data Porta = Write_char + C Waitms 10 Portb = Command_diable '--------C=C+1 I=I+1 If I = 20 Then I = 0 If C = 40 Then C = 0 Next J '---------------end program End
'
'set address is &H00 and next one
'write Char. is "A" and next one.
'
'set address is &H40 and next one
'write Char. is "B" and next one.
'if DDRAM address is end then come back &H00.
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.

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