LMB204BDC

LMB204BDC

LCD Module User Manual

Shenzhen TOPWAY Technology Co., Ltd.

Rev. Descriptions Release Date

2005-01-06

URL: www.topwaydisplay.com www.topwaysz.com

Document Name: LMB204BDC-Manual-Rev0.1.doc

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LMB204BDC

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

Basic Setting....................................................................................................................... 7

4.2

Resetting the LCD module ................................................................................................. 7

4.3

Adjusting the LCD display contrast..................................................................................... 7

4.4

Display Memory Map.......................................................................................................... 8

4.5

Character Code Rom.......................................................................................................... 9

5.

Design and Handling Precaution ......................................................................................... 11



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1. Basic Specifications


1) LCD Display Mode : STN, Positive, Transflective

2) Display Color : Display Data = “1” : Deep Blue (*1)

3) Viewing Angle

: Display Data = “0” : Light Gray(*2)

: 6H

4) Driving Method

5) Back Light

: 1/16 duty, 1/5 bias

: Yellow-Green LED backlight

Note:

*1. Color tone may slightly change by Temperature and Driving Condition.

*2. The Color is defined as the inactive / background color

1) Outline Dimension : 98.0 x 60.0 x 13.7MAX

(See attached Outline Drawing for details)

DB0 – DB7

RS, R/W, E

VDD

VSS

V0

BLA

BLK

ST7066U or equivalent

COM1

COM16

:

:

COM1

:

COM16

:

LED

Backlight

Circuit

ST7063C or equivalent (1/4)

LCD Panel

20 x 4 Char (5x8dots)

ST7063C or equivalent

LMB204BDC

ST7063C or equivalent (3/4)



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Pin No.

1

2

3

5

Pin

Name

VSS

VDD

V0

R/W

I/O Descriptions

Power Power supply, Ground (0V)

Power Positive power supply

Power LCD contrast reference supply

RS=HIGH: transferring display data

RS=LOW: transferring instruction data

Input Read / Write Control:

R/W=HIGH: Read mode selected

R/W=LOW: Write mode selected

7 DB0 Bi-directional tri-state Data bus

: :

14 DB7

In 8 bit mode, DB0 ~ DB7 are in use

In 4 bit mode, DB4 ~ DB7 are in use, DB0~DB3 leave open

15

16

BLA

BLK

Power Backlight positive supply

Power Backlight negative supply

LMB204BDC



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LMB204BDC

2. Absolute Maximum Ratings

Items

Supply Voltage

Input Voltage

Operating Temperature

Symbol Min. Max. Unit Condition

V

DD

V

IN

T

OP

0 V

DD

V = 0V

-20 70 No Condensation

Storage Temperature T

ST

-30 80 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

Items

Operating Voltage

Input High Voltage

Input Low Voltage

Output High Voltage

Output Low Voltage

Operating Current

Symbol MIN.

V

SS

=0V, V

DD

=5.0V, T

OP

=25

°C

TYP. MAX. Unit Condition /

Application Pin

V

DD

V

IH

V

IL

V

OH

V

OL

I

DD

0.8xV

DD

V

SS

0.7xV

DD

V

SS

- V

DD

- 0.5 V

- V

DD OH

=-0.1mA, DB0 ~ DB7 mA VSS

3.2 LED Backlight Circuit Characteristics

Items Symbol MIN. TYP. MAX.

V

BLK

=0V, If

BLA

=180mA, T

OP

=25

°C

Unit Applicable Pin

Forward Voltage Vf

BLA

Forward Current If

BLA

Cautions:

Exceeding the recommended driving current could cause substantial damage to the backlight and shorten its lifetime.

BLA

BLK

No. of LED = 18 x 2 pcs



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Item

E cycle time

E high level width

E rise time

E fall time

Address set-up time

Address hold time

Data set-up time

Data delay time

Data hold time


Symbol

tc tpw tr tf tas tah tdsw tddr th

MIN.

1500

175

-

-

5

13

50

-

13

LMB204BDC

TYP.

-

-

-

-

-

-

-

-

-

V

SS

=0V, V

DD

MAX.

=5V, T

OP

=25

°C

Unit

-

-

20 ns ns ns

20

-

-

-

125

- ns ns ns ns ns ns

Host Write Timing Diagram


Host Read Timing Diagram


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4. Function Specifications

LMB204BDC

To drive the LCD module correctly and provide normally display, please use the following setting

- N=1, 2-line display

- F=0, 5x8 dots font

- D=1, display on

Note:

*1. These setting/commands should issue to the LCD module while start up.

*2. See the Display Commands section for details.

4.2 Resetting the LCD module

When turning on the VDD and VSS power supply, LCD module will execute the reset routine automatically. It takes about 80ms. After the reset routine, the LCD module status will be as follow:

- Display clear

- F=0, 5x8 dot character font

- I/D=1, Increment by 1

Note:

*1. Reset routine could not generate the Basic Setting

4.3 Adjusting the LCD display contrast

A Variable-Resistor must be connected to the LCD module for providing a reference supply to V0.

Adjusting the VR will result the change of LCD display contrast. The recommended value of VR is

5k Ohm.

LCD Module

V0

VSS



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LMB204BDC

4.4 Display Memory Map

There are two main memory-areas in the LCD module for display.

- Character Generator RAM (CGRAM)

- Display Data RAM (DDRAM)

4.4.1 Character Generator RAM (CGRAM)

Character Generator RAM is for storing the User-defined Characters (5x8 dots font).

Totally 8 User-defined Characters (character code = 00h ~ 07h) could be created.

The User-defined Character Codes are 00h and 07h. They could be called into DDRAM as normal character.

User-defined

Character

Code

CGRAM

Address

CGRAM Data (Font Pattern)

D7 ~ D5 D4 ~ D0

00h

(08h)

01h

(09h)

02h

(0Ah)

03h

(0Bh)

04h

(0Ch)

05h

(0Dh)

06h

(0Eh)

07h

(0Fh)

27h

28h

29h

:

2Eh

2Fh

30h

31h

19h

:

1Eh

1Fh

20h

21h

:

26h

:

36h

37h

38h

39h

:

3Eh

3Fh

0Eh

0Fh

10h

11h

:

16h

17h

18h

00h

01h

:

06h

07h

08h

09h

:

Not Use

Not Use

Not Use

Not Use

Not Use

Not Use

Not Use

Not Use

5 x 8 dots font pattern








CGRAM Address Map



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LMB204BDC

4.4.2 Display Data RAM (DDRAM)

ROM Characters (Character Code = 10h ~ FFh) could be written into DDRAM for displaying the

Character (5x8 dots font). User-defined Characters (Character Code = 00h ~ 07h) stored in

CGRAM could also be use. Calling Character Code 08h ~ 0Fh will call out User-defined

Characters 00h ~ 07h respectively.

1 st

2 nd

3 rd

4 th

5 th

COLUMN

16 th

17 th

18 th

19 th

20 th

1 st

00h 01h 02h 03h 04h

4 th

54h 55h 56h 57h 58h

DDRAM Address Map

Note:

*1. The mapping is based on top view of the LCD module

*2. N=1, 2-line display

*3. F=0, 5x8 dots font

*4. D=1, display on

0Fh 10h 11h 12h 13h

2 nd

40h 41h 42h 43h 44h

3 rd

14h 15h 16h 17h 18h

20 x 4 Characters

(5x8 dots font)

4Fh 50h 51h 52h 53h

23h 24h 25h 26h 27h

63h 64h 65h 66h 67h

Please refer to ST7066U-0A Data sheet



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Display Commands


LMB204BDC

Code

No. Instructions Function

1

2

3

4

5

6

Clear

Display

Return

Home

Entry Mode

Set

Display

ON/OFF

Cursor or

Display Shift

Function

Set

0 0 0 0 0 0 0 0 0 1

Write “20h” to DDRAM and set DDRAM address (AC) to “00h”

0 0 0 0 0 0 0 0 1 x

Set DDRAM address (AC) to “00h” and return cursor to its original position if shifted

(DDRAM contents are not change)

Set cursor moving direction and specify display

0 0 0 0 0 0 0 1 I/D S shift, during data read and write of DDRAM and

CGRAM.

S=1, screen shifting; S=0, no screen shifting

I/D=1, AC=AC+1 and if S=1, screen shift left

I/D=0, AC=AC-1 and if S=0, screen shift right

D=1, display on; D=0, display off

0 0 0 0 0 0 1 D C B C=1, cursor on; C=0, cursor off

B=1, cursor blinking on; B=0, cursor blinking off

Move the cursor or shift the display, where

0 0 0 0 0 1 S/C R/L x x

DDRAM contents.

S/C=1, shift screen;

R/L=1, to right-side;

S/C=0, shift cursor

R/L=0, to left side

(if S/C=1, AC will not be changed)

0 0 0 0 1 DL N F x x

DL=1, 8-bit interface; DL=0, 4-bit interface

N=1, 2-line display; N=0, 1-line display

F=1, 5x11 dots font; F=0, 5x8 dots font

7

8

Set CGRAM address

Set DDRAM address

Set CGRAM address in address counter

Set DDRAM address in address counter

9

10

11

Read Busy flag

& address

Write data to RAM

Read data from RAM

1 0 D7 D6 D5 D4 D3 D2 D1 D0

1 1 D7 D6 D5 D4 D3 D2 D1 D0

Check the system status and get the address counter content (AC6~AC0).

BF=1, busy; BF=0, ready

Write the data into internal RAM, where the address counter pointing at.

Read the data from internal RAM, where the address counter pointing at.

Note:

*1. Do not use any other command not listed, or the system malfunction may result.

*2. For the details of the Display Commands, please refer to S6A0069 datasheet.



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LMB204BDC

5. Design and Handling Precaution

1.

2.

3.

4.

5.

6.

7.

8.

The LCD panel is made by glass. Any mechanical shock (eg. dropping form high place) will damage the LCD module.

Do not add excessive force on the surface of the display, which may cause the Display color change abnormally.

The polarizer on the LCD is easily get scratched. If possible, do not remove the LCD protective film until the last step of installation.

Never attempt to disassemble or rework the LCD module.

Only Clean the LCD with Isopropyl Alcohol or Ethyl Alcohol. Other solvents (eg. water) may damage the LCD.

When mounting the LCD module, make sure that it is free form twisting, warping and distortion.

Ensure to provide enough space (with cushion) between case and LCD panel to prevent external force adding on it, or it may cause damage to the LCD or degrade the display result.

Only hold the LCD module by its side. Never hold LCD module by add force on the heat seal or TAB.

9. Never add force to component of the LCD module. It may cause invisible damage or degrade of the reliability.

10. LCD module could be easily damaged by static electricity. Be careful to maintain an optimum anti-static work environment to protect the LCD module.

11. When peeling off the protective film from LCD, static charge may cause abnormal display pattern. It is normal and will resume to normal in a short while.

12. Take care and prevent get hurt by the LCD panel sharp edge.

13. Never operate the LCD module exceed the absolute maximum ratings.

14. Keep the signal line as short as possible to prevent noisy signal applying to LCD module.

15. Never apply signal to the LCD module without power supply.

16. IC chip (eg. TAB or COG) is sensitive to the light. Strong lighting environment could possibly cause malfunction. Light sealing structure casing is recommend.

17. LCD module reliability may be reduced by temperature shock.

18. When storing the LCD module, avoid exposure to the direct sunlight, high humidity, high temperature or low temperature. They may damage or degrade the LCD module



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LMB204BDC

Table of Content

1. Basic Specifications

2. Absolute Maximum Ratings

3. Electrical Characteristics

4. Function Specifications

CGRAM Address Map

DDRAM Address Map

5. Design and Handling Precaution

Table of contents