LM12832HCW

TOPWAY

LCD Module User Manual

LM12832HCW

LCD Module User Manual

Prepared by:

Checked by:

Approved by:

Wang

Date:2018-6-27

Date:

Rev.

Descriptions

Release Date

0.1

Prelimiay release

2018-6-27

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LCD Module User Manual

LM12832HCW

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............................................................................................................. 9

4.1 Application circuit(Example).......................................................................................................................................... 9

4.2 Adjusting the Display Contrast...................................................................................................................................... 9

4.3 Basic Setting................................................................................................................................................................ 9

4.4 Resetting the LCD module........................................................................................................................................... 9

4.5 Display Memory Map ................................................................................................................................................. 10

4.6 Display Commands .................................................................................................................................................... 11

4.7 Display Commands (continue) .................................................................................................................................... 12

5. Design and Handling Precaution............................................................................................ 13

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LCD Module User Manual

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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 Gray (*2)

3) Viewing Angle

: 12H

4) Driving Method

: 1/33 duty, 1/6 bias

5) Backlight

: 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

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

1.2 Mechanical Specifications

1) Outline Dimension

: 37.2 x19.0 x 8.2(Exclude FPC Length)

(See attached Outline Drawing for details)

1.3 Block Diagram

BLA

Backlight Circuit

BLK

LCD Panel

128 × 32Pixels

VDD,VSS,ESD

XV0,V0,VG

ST7567 or equivalent

D0~D7

R/W,E,A0

C86,PSB,/RST,/CS

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1.4 Terminal Functions

Descriptions

8-bit parallel

Serial mode

PIN NO

Name

I/O

8080 mode

6800mode(default)

ESD

Supply

Negative power supply,0V

PSB

Input

PSB=High

PSB=Low

C86

Input

C86=Low

C86=High

C86=Low

Power

LCD driving voltage for segment circuits

XV0

Power

LCD driving voltage for common circuits at positive frame

Power

LCD driving voltage for common circuits at negative frame

VSS

Power

Negative power supply,0V

VDD

Power

Positive power supply

I/O

8-bit Data bus;

Serial data input

I/O

Three state I/O terminal for display data or

Serial clock input

I/O

instruction data

Not used

I/O

when /CS=H,

Pull Hi

I/O

D0~D7=High Impedance

E(/RD)

Input

/WR=H, /RD=L;

R/W=H,E=L;

Not used,

Data or Status

Data or Status read

Pull Hi

read form the LCD

form the LCD module

module

R/W=L,E=H  L;

R/W(/WR)

Input

/WR=L  H,

Data or Status latch

/RD=H;

into the LCD module

Data or Instruction

latch into the LCD

module

Input

A0 = H, Transferring the Display Data

A0 = L, Transferring the Control Data

/RST

Input

Reset signal

/RES = L, Initialization is executed

/RES = H, Normal running.

/CS

Input

Chip Select

/CS=L, enable access to the LCD module

/CS=H, disable access to the LCD module

ESD

Supply

Negative power supply,0V

BLA

Power

Positive power for LED backlight

BLK

Power

Negative power supply for LED backlight, 0V

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LCD Module User Manual

LM12832HCW

2. Absolute Maximum Ratings

Items

Symbol

Min.

Max.

Unit

Condition

Supply Voltage

V DD

-0.3

+3.6

V SS = 0V

Input Voltage

V IN

-0.3

+3.6

V SS = 0V

Operating Temperature

T OP

-20

+70

 C

No Condensation

Storage Temperature

T ST

-30

+80

 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 =3.3V, T OP =25  C

Items

Symbol

MIN.

TYP.

MAX.

Unit

Condition /

Application Pin

Operating Voltage

V DD

2.8

3.3

VDD

Input High Voltage

V IH

0.7xV DD

V DD

PSB,C86,E(RD),R/W

Input Low Voltage

V IL

V SS

0.3xV DD

(WR),A0,/RST,/CS,

D0~D7

Operating Current

I DD

0.15

0.38

VDD

3.2 LED Backlight Circuit Characteristics

BLK=0V,BLA=3.3V, T OP =25  C

Items

Symbol

MIN.

TYP.

MAX.

Unit

Applicable Pin

Forward Voltage

BLA

3.3

BLA

Forward Current

I BLA

BLA

Cautions:

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

BLA

BLK

No. of LED = 2 pcs

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3.3 AC Characteristics

3.3.1 6800 Mode Interface(Defualt)

V SS =0V, V DD =3.3V, T OP =25  C

Item

Symbol

MIN.

TYP.

MAX.

Unit

System cycle time

tcyc6

312

Address setup time (A0)

taw6

Address hold time (A0)

tah6

Control LOW pulse width (Read)

tewlr

104

Control LOW pulse width (Write)

tewlw

104

Control HIGH pulse width (Read)

tewhr

104

Control HIGH pulse width (Write)

tewhw

182

Write data setup time

tds6

Write data hold time

tdh6

Read data access time (*2)

tacc6

Read date output disable time (*2)

toh6

Note:

*1. Input signal rise/fall time should be less than 15ns .

*2. CL=100pF

*3.All timing is using 20% and 80% of VDD as the reference.

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3.3.2 8080 Mode Interface

V SS =0V,V DD =3.3V,T OP =25  C

Item

Symbol

MIN.

TYP.

MAX.

Unit

System cycle time

tcyc8

312

Address setup time (A0)

taw8

Address hold time (A0)

tah8

Control LOW pulse width (Read)

tccl r

182

Control LOW pulse width (Write)

tcclw

104

Control HIGH pulse width (Read)

tcch r

104

Control HIGH pulse width (Write)

tcchw

104

Write data setup time

tds8

Write data hold time

tdh8

Read data access time (*2)

tacc8

Read data output disable time (*2)

tch8

Note:

*1. Input signal rise/fall time should be less than 15ns .

*2. CL=100pF

*3.All timing is using 20% and 80% of VDD as the reference.

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3.3.3 Serial Mode Interface

V SS =0V,V DD =3.3V,T OP =25  C

Item

Symbol

MIN.

TYP.

MAX.

Unit

Serial Clock Period

tscyc

SCL “H” pulse width

tshw

SCL “L” pulse width

tslw

Address setup time (A0)

tsas

Address hold time (A0)

tsah

Data setup time

tsds

Data hold time

tsdh

/CS-SCL time

tcss

/CS-SCL time

tcsh

Note:

*1. Input signal rise/fall time should be less than 15ns .

*2. All timing is using 20% and 80% of VDD as the reference.

3.3.4 Reset Timing

V SS =0V, V DD =3.0V, T OP =25  C

Item

Symbol

MIN.

TYP.

MAX.

Unit

Reset time

μ s

Reset LOW pulse width

trw

μ s

Note:

*1.All timing is using 20% and 80% of VDD as the reference.

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4. Function specifications

4.1 Application circuit(Example)

Internal Boosting

6800 mode

C1,C2=1.0 μ F (25V)

TO MCU

Note:

Please refer to the ST7567 data sheet for details

4.2 Adjusting the Display Contrast

This LCD module equipped with latest digital contrast adjustment function.

Its display contrast could be adjusted by MCU command. (please see the command tables for

details)

It is recommended to provide a contrast adjustment interface for end-user, where the best

display result could meet the individual preference in mass production.

4.3 Basic Setting

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

MX = 1 (Reverse)

INV select = 0 (Normal)

LCD Bias Select = 1/6

Initial Display Line = 4

Entire Display ON/OFF = OFF (normal)

Reverse Display ON/OFF = OFF (normal)

Set Power Control Set:

voltage follower = ON, voltage converter = ON, voltage regulator = ON

Display ON/OFF = ON

Note:

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

*2. See the Display Commands section for details.

4.4 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)

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4.5 Display Memory Map

Page address

data

LCD Display (front view)

128x32 pixels

Column Address

04h



84h

Note:

*1. MX = 1 (reverse)

*2. INV Selection = 0(normal)

*3. Initial Display Line = 4

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4.6 Display Commands

Code

No.

Instructions

Function

DON=0, display off

Display ON/OFF

0 1 0 1 0 1 0 1 1 1

DON=1, display on

Display start

Sets the display RAM display start line

Display start line set

0 1 0 0 1

address

Page

Set Page Address

0 1 0 1 0 1 1

Address

Set the display RAM page address

Set Column Address

0 1 0 0 0 0 1

Col. Add.

Upper

Set the upper-4-bit of column address counter

(Upper-4-bits)

Set Column Address

0 1 0 0 0 0 0

Col. Add.

Set the lower-4-bit of column address counter

(Lower-4-bits)

Lower

Read the status data

Read Status

0 0 1

Status

0 0 0 0

Write Display Data

1 1 0

Write Data

Write data into the display RAM

Read Display Data

1 0 1

Read Data

Read data form the display RAM

Sets the display RAM address SEG output

SEG Direction

0 1 0 1 0 1 0 0 0 0

correspondence

MX = 0,normal . MX=1, reverse

INV=0, Normal display

Inverse Display

0 1 0 1 0 1 0 0 1 1

INV=1, Reverse display

AP =0, Normal display

All Pixel ON

0 1 0 1 0 1 0 0 1 0

AP =1, Entire display ON

Set the LCD driving voltage bias

Set LCD Bias

0 1 0 1 0 1 0 0 0 1

BIAS=0, 1/9 BIAS

BIAS=1, 1/7 BIAS

Enter the “Read-Modify-Write” mode

column address counter will increase in each

Set Read-Modify-Write

0 1 0 1 1 1 0 0 0 0 0 “Write Display Data”,

and will not increase in each “Read Display

Data command”

Reset Read-Modify-Write 0 1 0 1 1 1 0 1 1 1 0 Clear the “Read-Modify-Write” mode

Reset

0 1 0 1 1 1 0 0 0 1 0 Resets the LCD module

Set the COM scanning direction

MY =0, Normal display

COM Direction

0 1 0 1 1 0 0

* * *

MY=1, Flipped in y direction

* = don’t care terms

Set the power circuit operation mode

VF: LCD Supply Voltage Follower

Power Control Set

0 1 0 0 0 1 0 1

VR: LCD Supply Voltage Regulator

VC: LCD Supply Voltage Converter

(1=ON, 0=OFF)

Radio

Regulator Resistor Select 0 1 0 0 0 1 0 0

setting

Set the built-in resistor ratio (Rb/Ra)

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4.7 Display Commands (continue)

Code

No.

Instructions

Function

Electronic volume mode set 0 1 0 1 0 0 0 0 0 0 1

Set reference voltage mode

Electronic volume register

Electronic

Set reference voltage register

set

0 1 0 * *

Control value

(Display contrast value)

0 1 0 1 0 1 0 1 1 0 S Sleep Mode (2 byte command)

Sleep Mode Set

0 1 0 0 0 0 0 0 0 0 0

S=0, sleep mode

S=1, normal mode

Booster Ratio Set

0 1 0 1 1 1 1 1 0 0 0 Booster Ratio (2 byte command)

Ratio=00, 2x, 3x, 4x

0 1 0 0 0 0 0 0 0

Rati

Ratio=01, 5x

Ratio=11, 6x

NOP

0 1 0 1 1 1 0 0 0 1 1 Non-operation command

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 ST7567 data sheet.

4.7.1 Power off the LCD Module

It recommends that enter Sleep Mode before power off the LCD module.

4.7.2 Refreshing The LCD Module

It recommends that the operating modes and display contents be refreshed periodically to prevent

the effect of unexpected noise.

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5. Design and Handling Precaution

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.

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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