LM6800-2

LM6800-2

LCD Module User Manual

Prepared by:

Checked by:

Approved by:

Yang

Date: 2010-05-25

Date:

Rev. Descriptions

Release Date

0.1

Preliminary New release

2010-05-25

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Document Name: LM6800-2-Manual-Rev0.1

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TOPWAY

LCD Module User Manual

LM6800-2

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

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

4.3

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

4.4

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

4.5

Internal Registers ................................................................................................................................................... 8

4.6

Display Control Instructions ................................................................................................................................... 9

5. Design and Handling Precaution ........................................................................................ 10

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LCD Module User Manual

LM6800-2

Basic Specifications

1.1 Display Specifications

1) LCD Display Mode

: FSTN, Negative, Transmissive

2) Display Color

: Display Data = “1” : Dark Gray (*1)

: Display Data = “0” : Light White (*2)

3) Viewing Angle

: 6 H

4) Driving Method

: 1/64 duty, 1/9bias

5) Back Light

: White LED backlight

Note:

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

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

1.2 Mechanical Specifications

1) Outline Dimension

: 137.0 x 39.6.0 x 11.3MAX

(see attached Outline Drawing for details)

1.3 Block Diagram

LCD Panel

256 x 64 pixels

LED

BLA

Backlight

Circuit

S6B0108

VDD

Power and

equivalent

VSS

LCD Booster

VOUT

Circuit

DB0 - DB7

RS, R/W, E, /RST

CSA, CSB, CSC

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LCD Module User Manual

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1.4 Terminal Functions

No. Name

I/O

Descriptions

VSS Power Negative Power Supply, Ground (0V)

VDD Power Positive Power Supply

Input LCD Contrast reference

VOUT Output Power Booster output for V0

Input RS = H; DB0 – DB7 = Display RAM data

RS = L; DB0 – DB7 = Instruction data

R/W

Input In read mode

Input

R/W = H;

Data read form the LCD module,

data appears at DB0 – DB7 and can be read by the host

while, E = H and the device is being selected

In write mode

R/W = L;

Data write to the LCD module,

data appears at DB0 – DB7 will be written into the LCD module

at E = H  L and device is being selected

DB0

I/O

Data bus:

Three state I/O terminal for display data or instruction data

DB7

I/O

CSA

Input Chip selection, enable access to each section of the LCD module

CSB

Input

CSC CSB CSA Function

CSC

Input

Enable access of the Left-Most Section (64 column)

of the LCD module

Enable access of the Middle-Left Section (64 column)

of the LCD module

Enable access to the Middle-Right Section (64 column)

of the LCD module

Enable access to the Right-Most Section (64 column)

of the LCD module

Disable all the access to the LCD module

/RST

Input Reset signal

/RST = L,

Display off

display start line register becomes 0

no command or instruction data could be accepted

/RST = H,

Normal running

BLA Power Positive Power Supply for LED backlight

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LCD Module User Manual

LM6800-2

2. Absolute Maximum Ratings

Items

Symbol

Min.

Max.

Unit

Condition

Supply Voltage

V DD

7.0

V SS = 0V

Operating Temperature

T OP

-20

 C

No Condensation

Storage Temperature

T ST

-30

 C

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

3.1 DC Characteristics

V SS =0V, V DD =5V, T OP =25  C

Items

Symbol

MIN.

TYP.

MAX.

Unit

Applicable Pin

Operating Voltage

V DD

4.8

5.0

5.2

VDD

Input High Voltage

V IH

3.5

V DD

RS, R/W, E, DB0-DB7

Input Low Voltage

V IL

0.4

CSA, CSB, CSC

Operating Current

I DD

6.0

VDD, VSS

3.2 LED Backlight Circuit Characteristics

VSS=0V, If BLA =120mA, T OP =25  C

Items

Symbol

MIN.

TYP.

MAX.

Unit

Applicable Pin

Forward Voltage

Vf BLA

5.0

BLA

Forward Current

If BLA

132

BLA

VSS

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LCD Module User Manual

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3.3 AC Characteristics

V SS =0V, V DD =5V, T OP =25  C

Item

Symbol

MIN.

TYP.

MAX.

Unit

E cycle time

1500

E high level width

twh

700

E low level width

twl

700

E rise time

E fall time

Address set-up time

tasu

240

Address hold time

tah

Data set-up time

tdsu

300

Data delay time

480

Data hold time (write)

tdhw

Data hold time (read)

tdhr

Host Write Timing Diagram

Host Read Timing Diagram

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LCD Module User Manual

LM6800-2

4. Function Specifications

4.1 Basic Setting

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

Display start line (Z address)= 0

LCD Display = on

Note:

These setting/commands should issue to all controllers while start up.

See the Display Control Instructions section for details.

4.2 Adjusting the LCD display contrast

A Variable-Resistor must be connected to

LCD module

the LCD module for providing a reference to

V0. Adjusting the VR will result the change

VDD

of LCD display contrast.

The recommended value of VR is 25k to 50k

VOUT

VSS

4.3 Resetting the LCD module

The LCD module should be initialized by setting /RST terminal at low level when turning the power

on.

When /RST pull low, the LCD module will:

- Display off

- Display start line register becomes 0. (Z-address=0)

While /RST is low, no instruction can be accepted except status read. Therefore, execute other

instructions after making sure that DB4=0 (clear /RST) and DB7=0 (ready) by status read

instruction. The conditions of power supply at initial power up are as follow:

Item

Symbol

MIN.

TYP.

MAX.

Unit

Reset time

trs

2.0

Rise time

150

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4.4 Display Memory Map

Page (X) address data

LCD Display (front view)

256x64 pixels

Column(Y) Address

00h  3Fh

Chip Select CSA

Chip Select CSB

Chip Select CSC

Note:

1) Display start line (Z address) = 0

2) The Display Data store separately in four drivers.

4.5 Internal Registers

There are three registers in each section of LCD module. Each of them could be controlled

independently.

Page (X) Address Register

X address register designates pages of the internal display data RAM. Count function is not

available. The address should set by instruction.

Column (Y) Address Counter

Y address counter designates address of the internal display data RAM. It could be set by

instruction and increased by 1 automatically by read or write display data operations.

Display Start Line (Z) Register

Z address register indicates of display data RAM to LCD top line. It may be used for scrolling the

display pattern on the LCD.

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LCD Module User Manual

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4.6 Display Control Instructions

Code

Instructions

Function

Controls the display on or off. Internal status and display

Display on/off

0 0 0 0 1 1 1 1 1 1/0 data in RAM is not affected

0=off, 1=on

Set Column (Y)

0 0 0 1

Y address (0-63)

Set the Column address into the Y address counter

Address

Set Page (X)

X address

0 0 1 0 1 1 1

Set the Page address into the X address register

Address

(0-7)

Set Display Start

Z address

0 0 1 1

Indicates the display data RAM displayed at the top of the

Line (Z address)

(0-63)

screen

Read status

Busy=L, Driver ready; Busy=H, Driver busy

Status Read

0 1

0 0 0 0

on/off=L, Display is on; on/off=H, Display is off

Reset=L, Normal Running; Reset=H, reset

Write display data into display data RAM,

Write Display Data 1 0

Write data

After writing instruction, Y address counter increased by 1

automatically

Read Display Data 1 1

Read data

Read display data form the display data RAM

Note:

*1. For the details of the Display Control Instructions, please refer to Samsung S6B0108

handbook.

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LCD Module User Manual

LM6800-2

5. Design and Handling Precaution

Please refer to "LCD-Module-Design-Handling-Precaution.pdf".

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Document Name: LM6800-2-Manual-Rev0.1

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