LM3037BFW

LM3037BFW

LCD Module User Manual

Shenzhen TOPWAY Technology Co., Ltd.

Rev. Descriptions

Release Date

0.1

Preliminary New release

2008-02-22

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Document Name: LM3037BFW-Manual-Rev0.1

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LCD Module User Manual

LM3037BFW

Table of Content

1. Basic Specifications .............................................................................................................. 3

1.1

Display Specifications ............................................................................................................................................ 3

1.2

Mechanical Specifications ...................................................................................................................................... 3

1.3

Block Diagram ........................................................................................................................................................ 3

2. Terminal Functions ................................................................................................................ 4

3. Absolute Maximum Ratings .................................................................................................. 5

4. Electrical Characteristics ...................................................................................................... 5

4.1

DC Characteristics ................................................................................................................................................. 5

4.2

LED Backlight Circuit Characteristics ..................................................................................................................... 5

4.3

AC Characteristics (Parallel Mode Interface) ......................................................................................................... 6

4.4

AC Characteristics (Serial Mode Interface) ............................................................................................................ 7

4.5

Reset Timing .......................................................................................................................................................... 7

5. Function Specifications ......................................................................................................... 8

5.1

Resetting the LCD module ..................................................................................................................................... 8

5.2

Using Parallel interface .......................................................................................................................................... 8

5.3

Using Serial interface ............................................................................................................................................. 8

5.4

Display Memory Map ............................................................................................................................................. 9

5.5

Display Control Instructions ................................................................................................................................. 11

6. Design and Handling Precaution ........................................................................................ 13

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1. Basic Specifications

1.1 Display Specifications

1) LCD Display Mode

: STN, Negative, Transmissive

2) Display Color

: Display Data = “1” : Light Gray (*1)

: Display Data = “0” : Deep Blue (*2)

3) Viewing Angle

: 6 H

4) Driving Method

: 1/33 duty, 1/5bias

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

: 80.8 x 35.0 x 12.5MAX

(see attached Outline Drawing for details)

1.3 Block Diagram

ST7920 or

ST7921 or

equivalent

DB0 - DB7

RS, R/W, E

PSB, /RST

VDD

LCD Panel

VSS

144 x 32 pixels

BLA

LED Backlight Circuit

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2. Terminal Functions

Descriptions

No. Name

I/O

Parallel mode (PSB=H)

Serial Mode (PSB=L)

VSS

Power Negative Power Supply, Ground (0V)

VDD

Power Positive Power Supply

No Connection (keep open)

Input Register Select

Chip Select

(CS)

RS=H; data read or write

CS=H; chip enable

RS=L; Instruction data write or status busy flag read CS=L; chip disable

R/W

Input Read write control

Serial Input Data

(SID)

R/W=H; data or status read

R/W=L; data or command write

Input Enable trigger

Serial Clock

(SCLK)

DB0

I/O

8-bit Data Bus

Leave open

In 4 bit mode,

or pull-up

DB7

I/O

DB3~DB0 could leave open or pull-up

BLA

Power Positive Power for LED backlight

No Connection (keep open)

PSB

Interface selection:

PSB=L; serial mode

PSB=H; 8 or 4 bit parallel bus mode

/RST

Input System reset; low active

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3. Absolute Maximum Ratings

Items

Symbol

Min.

Max.

Unit

Condition

Supply Voltage

V DD

-0.3

5.5

V SS = 0V

Input Voltage

V IN

-0.3

V DD +0.3

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.

4. Electrical Characteristics

4.1 DC Characteristics

V SS =0V, V DD =5.0V, 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 IH1

0.8V DD

V DD

RS, R/W, E, PSB, /RST,

Input Low Voltage

V IL1

V SS

0.4

DB0-DB7

Output High Voltage

V OH1

0.7V DD

V DD

DB0-DB7 (I OH = -0.1mA)

Output Low Voltage

V OL1

V SS

0.6

DB0-DB7 (I OL = 0.1mA)

Operating Current

I DD

1.7

5.0

VDD

4.2 LED Backlight Circuit Characteristics

V SS =0V, If BLA =40mA, T OP =25  C

Items

Symbol

MIN.

TYP.

MAX.

Unit

Applicable Pin

Forward Voltage

Vf BLA

5.0

BLA

Forward Current

If BLA

BLA

VSS

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4.3 AC Characteristics (Parallel Mode Interface)

V SS =0V, V DD =5V, T OP =25  C

Item

Symbol

MIN.

TYP.

MAX.

Unit

E cycle time

1500

E high level width

tpw

175

E rise time

E fall time

Address set-up time

tas

Address hold time

tah

Data set-up time

tdsw

Data delay time

tddr

125

Data hold time

Host Write Timing Diagram (Parallel Mode)

Host Read Timing Diagram (Parallel Mode)

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4.4 AC Characteristics (Serial Mode Interface)

V SS =0V, V DD =5V, T OP =25  C

Item

Symbol

MIN.

TYP.

MAX.

Unit

Clock Cycle

tscyc

500

SCLK high pulse width

tshw

250

SCLK low pulse width

tslw

250

SCLK rise time

SCLK fall time

SID data setup time

tsds

SID data hold time

tsdh

CS setup time

tcss

CS hold time

tcsh

Host Write Timing Diagram (Serial Mode)

4.5 Reset Timing

V SS =0V, V DD =5V, T OP =25  C

Item

Symbol

MIN.

TYP.

MAX.

Unit

Reset Pulse width

trw

2.0

Reset Start time

tres

100

Rest Timing Diagram

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5. Function Specifications

5.1 Resetting the LCD module

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

power on. See the reset timing section for details.

The initialized status is as follow:

Functions

Initialized Status

ENTER MODE SET

I/D=1

cursor move to right

S=0

DDRAM address counter (AC) plus 1

DISPLAY STATUS

D=0

display = OFF

C=0

cursor = OFF

B=0

cursor position blink = OFF

FUNCTION SET

DL=1

8bit Interface

RE=0

Basic Instruction Set

SCROLL OR RAM ADDR. SELECT

SR=0

CGRAM address access is enabled

REVERSE

R1=0, R0=0

First line normal

EXTENDED FUNCTION SET

G=0

Graphic Display OFF

5.2 Using Parallel interface

When PSB=H, the LCD module is in parallel interface mode. 8-bit or 4-bit bus interface could

be selected by FUNCTION SET instruction DL bit.

In 4-bit bus interface, every 8-bit instruction/data is separated into two parts. First, transfer

the higher 4-bit (D7~D4). Then transfer the lower 4-bit (D3~D0). They are transferred via

DB7~DB4 terminals, where DB3~DB0 are not in used (leave open or pull high)

5.3 Using Serial interface

When PSB=L, the LCD module is in serial interface mode (write only).

In this mode, CS pin should be used. CS=H, enable the data transfer. CS=L, reset the serial

data counter, terminate the data transition and clear the data buffer.

As the controller IC have no instruction buffer area, it must wait for the previous instruction to

finish before sending the next one. Thus transferring multiple instruction/data, execution time

must be considered.

Starting a transmission, a start byte is required. It consists 5 consecutive “1” follow with a “0”,

a RS bit (Register Select bit) and a “0”.

Then the 8bit instruction/data should be separated into 2 groups. First group is DB7 to DB4,

followed by 4 consecutive “0”. The second group is DB3 to DB0 with 4 consecutive “0”.

See the Data Sequence Diagram for details.

Data Sequence Diagram (Serial Mode)

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5.4 Display Memory Map

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

- Character Generator RAM (CGRAM)

- Graphic Display RAM (GDRAM)

- Display Data RAM (DDRAM)

5.4.1 Character Generator RAM (CGRAM)

Character Generator RAM is for storing the User-defined Characters (a 16x16 dots font). There are

only two characters could be defined.

The User-defined Character Codes are 0000h and 0002h. They could be called into DDRAM as

normal character.

User-defined

CGRAM

CGRAM data

Character Code

Address

D15 ~ D8

D7 ~ D0

00h

01h

0000h

16 x 16 dot font

0Eh

0Fh

10h

11h

0002h

16 x 16 dot font

1Eh

1Fh

CGRAM Address Map

5.4.2 Graphics Display RAM (GDRAM)

GDRAM is for full graphics display. It could be displayed when G=1 (set by EXTENDED

FUNCTION SET in Extended Instruction Set)

Horizontal Address (X)

00h

01h

07h

08h

D15 ~ D0

00h

01h

144x32 pixels

1Eh

1Fh

GDRAM Address Map

Note:

*1. The mapping is based on Vertical Scroll Displacement Address=0.

*2. Another 144x32 Graphics Display RAM space is not showed. They could be displayed by adjusting the Vertical Scroll

Displacement Address value.

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5.4.3 Display Data RAM (DDRAM)

GB Character Code (16bit, A1A0h~F7FFh) could write into DDRAM for displaying the Simplified

Chinese Character (16x16 dots font). User Characters (16bit, 0000h or 0002h) defined by user that

stored in CGRAM could also be used. The display character should be on grid only.

DDRAM Address (Lower 4bit)

00h

01h

02h

06h

07h

08h

80h

9 x 2 Characters

90h

(16x16 dots font)

DDRAM Address Map with 16x16 dots font

Note:

*1. The mapping is based on Vertical Scroll Displacement Address=0.

*2. Another 9x2(Characters) Display Data RAM space is not showed. They could be displayed by adjusting the Vertical Scroll

Displacement Address value.

Standard ASCII code (8bit, 00h~7Fh) could write into DDRAM for displaying the half-width

Character (8x16 dots font). The display character should be on grid only, and two characters

should be written in each write operation.

DDRAM Address (Lower 4bit)

00h

01h

02h

06h

07h

08h

80h

18 x 2 Characters

90h

(8x16 dots font)

DDRAM Address Map with 8x16 dots font

Note:

*1. The mapping is based on Vertical Scroll Displacement Address=0.

*2. Another 18x2(Characters) Display Data RAM space is not showed. They could be displayed by adjusting the Vertical Scroll

Displacement Address value.

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5.5 Display Control Instructions

5.5.1 Basic Instruction Set

RE=0, basic instruction set

Code

Instructions

Function

Fill DDRAM with “20h”, and set DDRAM address

CLEAR

counter (AC) to “00h”

Set DDRAM address counter (AC) to “00h” and put

HOME

X cursor to origin.

DDRAM content no changed.

Set cursor position and display shift when doing

write or read operation

ENTRY

1 I/D S

I/D=1, cursor move right AC increased by 1

MODE

I/D=0, cursor move left, AC decreased by 1

S=1, toggle the shift of the entire display

(based on I/D defined direction)

D=1, display ON

D=0, display OFF

DISPLAY

D C

C=1, cursor ON

ON/OFF

C=0, cursor OFF

B=1, blink ON

B=0, blink OFF

CURSOR

Cursor position and display shift control.

DISPLAY

1 S/C R/L X

DDRAM content no changed.

CONTROL

DL=1, 8bit interface

FUNCTION

1 DL X RE X

DL=0, 4bit interface

SET

RE=1, extended instruction

RE=0; basic instruction

SET CGRAM

Set CGRAM address to address counter (AC)

1 AC5 AC4 AC3 AC2 AC1 AC0 Make sure that in extended instruction SR=0 (scroll

ADDR

or RAM address selected)

SET DDRAM

0 AC7 AC6 AC5 AC4 AC3 AC2 AC1 AC0

Set DDRAM address to address counter (AC),

ADDR

where AC7 =1, AC6=0

READ BF &

1 BF AC6 AC5 AC4 AC3 AC2 AC1 AC0

Read busy flag (BF) for completion of the internal

ADDR

operation, also read out the value of AC

Write data to internal RAM

(DDRAM, CGRAM,GDRAM)

WRITE RAM 1 0 D7 D6 D5 D4 D3 D2 D1 D0

For 16bit data, write two byte consecutively,

high byte first, then low byte

Read data from internal RAM

READ RAM

1 D7 D6 D5 D4 D3 D2 D1 D0

(DDRAM, CGRAM,GDRAM)

Note:

*1. For the details of the Display Control Instructions, please refer to Sitronix ST7920 series datasheet.

*2. RE is the selection byte of basic and extended instruction set. Each time altering the value of RE, it will remain. Thus, it is not

necessary to set RE every time when using the same group of instruction set

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5.5.2 Extended Instruction Set

RE=1, extended instruction set

Code

Instructions

Function

SCROLL or

SR=1, enable vertical scroll position

RAM ADDR

1 SR

SR=0, enable CGRAM address (basic instruction)

SELECT

Toggle 1 out of 4 line (in DDRAM) of the display to

REVERSE

1 R1 R0

be reversed (initial value is R1 ,R0 = 0, 0

DL=1, 8bit interface

EXTENDED

DL=0, 4bit interface

RE=1, extended instruction

FUNCTION

1 DL X RE G

RE=0; basic instruction

SET

G=1, graphics display ON

G=0, graphics display OFF

SET

Set the address of vertical scroll

SCROLL

1 AC5 AC4 AC3 AC2 AC1 AC0 Make sure extended instruction SR=1, enable

ADDR

vertical scroll position.

SET

1 AC6 AC5 AC4 AC3 AC2 AC1 AC0 Set the GDRAM address to address counter (AC)

Dual byte command should write consecutively

GRAPHICS

First byte set the Vertical address AC6~AC0

RAM ADDR

0 AC3 AC2 AC1 AC0

Second byte set the Horizontal address AC3~AC0

Note:

*1. For the details of the Display Control Instructions, please refer to Sitronix ST7920 series datasheet.

*2. RE is the selection byte of basic and extended instruction set. Each time altering the value of RE, it will remain. Thus, it is not

necessary to set RE every time when using the same group of instruction set

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6. Design and Handling Precaution

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

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