One Stop Displays 310 Genius Drive Winter Park, FL 32789 407-629-0500 [email protected] 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 Item Ambient Temperature Humidity Corrosive gas 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 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 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 Symbol Tcyc Pweh tEf, tEr tAS tAH tDDR tH Min 500 230 Typ Max 20 40 10 80 10 Unit ns ns ns ns ns ns ns 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 Typ Max 20 40 10 160 5 Unit ns ns ns ns ns ns ns Unit V V mA V V uA 3.3 Timing Chart Write operation RS tAS Pweh tAH R/W tEf tH E tDSW tEr 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 Code Description Execution time 1 Clear entire display. Sets DDRAM address 0 into address counter 1.52ms I/D S Sets cursor move direction and specifies display shift 37us C B 37us S/C R/L X X 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 N X X RS R/ D7 W D6 D5 D4 D3 D2 D1 D0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 D 0 0 0 0 0 1 0 0 0 0 1 DL Set CGRAM 0 address 0 0 Set DDRAM 0 address 0 1 0 1 BF 1 0 1 1 Clear Display Entry mode set Display On/Off control Cursor/displ ay shift Function set Read busy flag & address Write data into the CGRAM or DDRAM Read data into the CGRAM or DDRAM 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 37us AC Reads busy flag (BF) indicating that internal operation is being performed Reads address counter contents 0us Write data Write data into the CGRAM or DDRAM 37us Read data Read data from the CGRAM or DDRAM 37us AC AC AC F 37us AC AC AC 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 37us 37us 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 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 1 1 * * * * BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION. FUNCTION SET (INTERFACE IS 8 BITS WAIT FOR MORE THAN 4.1ms RS R/W 0 0 LONG) DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 1 1 * * * * BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION. FUNCTION SET (INTERFACE IS 8 BITS WAIT FOR MORE THAN 100 us RS R/W 0 0 LONG) DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 1 1 * * * * 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 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 0 0 0 0 1 1 BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION. FUNCTION SET (INTERFACE IS 8 BITS LONG.) WAIT FOR MORE THAN 4.1ms RS R/W DB7 DB6 DB5 DB4 0 0 0 0 1 1 BF CANNOT BE CHECKED BEFORE THIS INSTRUCTION. 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 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 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. FUNCTION SET (INTERFACE IS 8 BITS LONG.) FUNCTION SET (SET INTERFACE IS 4 BIT LONG) DISPLAY OFF DISPLAY CLEAR END OF INITIALIZATION END OF INITIALIZATION ENTRY MODE SET 3.8 Block Diagram VDD PLED PANEL 16 VSS 20Char x 2Line VBT RS Controller & Driver R/W 40 60 E D0~D7 4 Driver Interface Pin Function Pin No. 1 2 3 Symbol I/O VSS VDD VBT I I I 4 RS I 5 R/W I 6 7 8 9 10 11 12 13 14 E D0 D1 D2 D3 D4 D5 D6 D7 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 HL: 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 Specification 73.45x11.4 79.0x17.0 113.0x41.4x9.6 0.5x0.65 34 6.2 Drawing 7 Optical specifications Item Response time Contrast ratio Viewing angle Brightness Color Condition Min. Rise Fall 100 lux 100 Top Bottom Left right With 30 polarizer - Note 1. YG.= yellow green Typ. Max. Unit 10 us 10 us 80 - deg 80 - deg 80 - deg 80 - deg 40 50 nits YG1 - Unit mm mm mm mm g 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 9 Application Note (1) Ref. Circuit Conditions 70 oC , 240 hrs -30 oC,240 hrs 60 oC,240 hrs -20 oC, 240 hrs 40oC, 90% RH, 240 hrs -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.