LM12832KCW

LCD Module User Manual

Prepared by:

Checked by:

Approved by:

Li KeKe

Date: 2020-07-17

Date:

Date:

Rev. Descriptions

Release Date

0.1

Preliminary release

2020-07-17

URL: www.topwaydisplay.com

Document Name: LM12832KCW-Manual-Rev0.1.DOC

Page: 1 of 12

TOPWAY

LCD Module User Manual

LM12832KCW

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

3.4 Reset Timing ……………………………………………………………………………………………………………………….6

4. Function specifications .............................................................................................................7

4.1 Application circuit(example)

………………………………………………………………………………………………….7

4.2 Adjusting the Display Contrast ………………………………………………………………………………………………….7

4.3 The Serial Interface …………………………………………………………………………………………………………….7

4.4 Basic Setting ……………………………………………………………………………………………………………………….8

4.5 Resetting the LCD module

………………………………………………………………………………………………….8

4.6 Display Memory Map …………………………………………………………………………………………………………….8

4.7 Display Commands …………………………………………………………………………………………………………….9

5. Design and Handling Precaution

...................................................................................12

URL: www.topwaydisplay.com

Document Name: LM12832KCW-Manual-Rev0.1.DOC

Page: 2 of 12

TOPWAY

LCD Module User Manual

LM12832KCW

1. Basic Specifications

1.1 Display Specifications

1) LCD Display Mode

: FSTN, Positive, Transflective

2) Display Color

: Display Data = “1” : Dark Gray(*1)

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

3) Viewing Angle

: 6H

4) Driving Method

: 1/32 duty, 1/9 bias

Note:

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

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

*3. Fine Contrast adjustment function is necessary in the application design for optimal display result

1.2 Mechanical Specifications

1) Outline Dimension

: 46.9x 22.6 x 7.85 MAX

(See attached Outline Drawing for details)

1.3 Block Diagram

BLA

Backlight

BLK

LCD Panel

128x 32 Pixels

VDD,VSS

A0,SCL,SDA,/CS,/RST

ST75263S or equivalent

VG,V0,XV0,CA1P,CA1N,COMSCN,

URL: www.topwaydisplay.com

Document Name: LM12832KCW-Manual-Rev0.1.DOC

Page: 3 of 12

TOPWAY

LCD Module User Manual

LM12832KCW

1.4 Terminal Functions

PIN NO

PIN Name

I/O

Descriptions

1

BLA

Backlight Positive power supply

2

BLK

Negative power for LED backlight

3

VG

P

VG is the power of SEG-drivers.

4

V0

Positive operating voltage of COM-drivers.

5

XV0

Negative operating voltage of COM-drivers.

6

CA1P

O

DC/DC voltage converter.

7

CA1N

Connect a capacitor between CA1P and CA1N.

8

VDD

Positive power supply.

P

9

VSS

Negative power supply,0V

Set scan direction of COM.

10

COMSCN

I

COMSCN= “ L ” ; COM0--COMX ;

COMSCN= “ H ” ; COMX — COM0;

Note: COMX is determined by the DUTY setting.

Chip select input pin.

11

/CS

I

/CS= “ L ” : This chip is selected and the MPU interface is active.

/CS= “ H ” : This chip is not selected and the MPU interface is

disabled

Register Select

12

A0

I

A0 = H, Transferring the Display Data

A0 = L, Transferring the Control Data

Reset signal

13

/RST

I

/RST = L, Initialization is executed

/RST = H, Normal running.

14

SCL

I

serial input clock (SCL).

15

SDA

I/O

input/output data (SDA).

16

VSS

P

Negative power supply,0V

URL: www.topwaydisplay.com

Document Name: LM12832KCW-Manual-Rev0.1.DOC

Page: 4 of 12

TOPWAY

LCD Module User Manual

LM12832KCW

4.4 Basic Setting

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

- Set Bias 1/9

- Set Duty 1/32

- MV = 0, MX =0

- AP=0 ， INV=0 (Normal display)

- Analog SET

- Power control

- Display ON

Note:

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

*2. See the Display Commands section for details.

4.5 Resetting the LCD module

The LCD module should be initialized by using /RES terminal.

While turning on the VDD and VSS power supply, maintain /RES terminal at LOW level. After the

power supply stabilized, release the reset terminal (/RES=HIGH)

4.6 Display Memory Map

Page address

data

LCD Display (front view)

D7

0

:

D0

D7

1

:

D0

D7

128x32 pixels

2

:

D0

D7

3

:

D0

Column Address

00h



7F

Note:

*1.MV=0

*2.MX=0

*3.COMSCN=1

*4 .Initial Display Line=0

URL: www.topwaydisplay.com

Document Name: LM12832KCW-Manual-Rev0.1.DOC

Page: 8 of 12

TOPWAY

LCD Module User Manual

LM12832KCW

5. Design and Handling Precaution

1.

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

will damage the LCD module.

2.

Do not add excessive force on the surface of the display, which may cause the Display

color change abnormally.

3.

The polarizer on the LCD is easily get scratched. If possible, do not remove the LCD

protective film until the last step of installation.

4.

Never attempt to disassemble or rework the LCD module.

5.

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

may damage the LCD.

6.

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

distortion.

7.

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.

8.

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

URL: www.topwaydisplay.com

Document Name: LM12832KCW-Manual-Rev0.1.DOC

Page: 12 of 12