LM12832BCW-A

Document Name: LM12832BCW-A-Manual-Rev0.1

LCD Module User Manual

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

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

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

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

1.4 Terminal Functions ............................................................................................................................................................................ 4

1.5 Backlight 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 Adjusting the Display Contrast ......................................................................................................................................................... 7

4.2 Application circuit(Example) ............................................................................................................................................................. 7

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

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

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

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

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

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

URL: www.topwaydisplay.com

Document Name: LM12832BCW-A-Manual-Rev0.1

LCD Module User Manual

1. Basic Specifications

1.1 Display Specifications

: FSTN, Positive, Transflective

: Display Data = “1” : Dark Gray(*1)

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

: 1/33 duty, 1/6 bias

*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

: 58.0 x 25.5 x 7.8 (mm) (exclude FPC terminal)

(See attached Outline Drawing for details)

URL: www.topwaydisplay.com

Document Name: LM12832BCW-A-Manual-Rev0.1

LCD Module User Manual

1.4 Terminal Functions

Supply Connect to VSS

/CS=L, enable access to the LCD module

/CS=H, disable access to the LCD module

/RES = L, Initialization is executed

/RES = H, Normal running.

A0 = H, Transferring the Display Data

A0 = L, Transferring the Control Data

Supply Positive power supply

Supply Negative power supply,0V

Supply LCD driving voltage for common circuits at negative frame

Supply LCD driving voltage for common circuits at positive frame

Supply LCD driving voltage for segment circuits

Supply Connect to VSS

1.5 Backlight Functions

Supply Backlight Positive power supply

Supply Backlight Negative power supply

URL: www.topwaydisplay.com

Document Name: LM12832BCW-A-Manual-Rev0.1

LCD Module User Manual

2. Absolute Maximum Ratings

Operating Temperature

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

3.2 LED Backlight Circuit Characteristics

V BLK =0V,If BLA =45mA, T OP =25  C

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

URL: www.topwaydisplay.com

Document Name: LM12832BCW-A-Manual-Rev0.1

LCD Module User Manual

3.3 AC Characteristics

V SS =0V, V DD =3.3V, T OP =25  C

Address setup time (A0)

Address hold time (A0)

SCL “H” pulse width

SCL “L” pulse width

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

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

V SS =0V, V DD =3.3V, T OP =25  C

Reset LOW pulse width

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

URL: www.topwaydisplay.com

Document Name: LM12832BCW-A-Manual-Rev0.1

LCD Module User Manual

4. Function specifications

4.1 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

- 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.

4.2 Application circuit(Example)

- Using internal ref resistor

- C1=0.1uF~1.0uF(25V)

- C2=0.1uF~1.0uF(25V)

Please refer to the ST7567S data sheet for details.

4.3 The Serial Interface

When the serial interface has been selected then when the chip is in active state the serial data

input(SI) and the serial clock(SCL) can be received. The serial data is read from the serial data

input pin in the rising edge of the serial clock . When “A0”=“H”, the data is display data, and when

“A0”=“L”, the data is command.

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

- MY select = 1 (reverse)

- LCD Bias Select = 1/6

- Initial Display Line = 0

- 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

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

*2. See the Display Commands section for details.

URL: www.topwaydisplay.com

Document Name: LM12832BCW-A-Manual-Rev0.1

LCD Module User Manual

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

LCD Display (front view)

*2. MY Selection = 1 (reverse)

*3. Initial Display Line = 0

URL: www.topwaydisplay.com

Document Name: LM12832BCW-A-Manual-Rev0.1

LCD Module User Manual

4.7 Display Commands

Set display start line

(3) Set Page Address

(4)Set Column Address 0 1 0

Set column address (MSB)

Set column address (LSB)

Write display data to RAM

Read display data from RAM

Set scan direction of SEG

MX=1, reverse direction

MX=0, normal direction

INV INV =1, inverse display

INV =0, normal display

AP=1, set all pixel ON

AP=0, normal display

0=1/9; 1=1/7 (at 1/65 duty)

(12) Read-modify-Write 0 1 0

Column address increment:

Exit Read-modify-Write mode

Set output direction of COM

MY=1, reverse direction

MY=0, normal direction

Control built-in power circuit

(17) Regulation Ratio

RP1 RP1 RP0 Select regulation resistor

Double command!! Set

electronic volume (EV) level

EV5 EV4 EV3 EV2 EV1 EV0

Display OFF + All Pixel ON

(22) SPI Read Status

SPI read status command

SPI read DDRAM command

*1. Symbol “-” means this bit can be “H” or “L”.

*2. For the details of the Display Commands, please refer to ST7567S data sheet.

4.7.1 Power off the LCD Module

It recommends that enter Power Save 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.

URL: www.topwaydisplay.com

Document Name: LM12832BCW-A-Manual-Rev0.1

LCD Module User Manual

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)

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

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

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

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

degrade of the reliability.

LCD module could be easily damaged by static electricity. Be careful to maintain an

optimum anti-static work environment to protect the LCD module.

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.

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

Never operate the LCD module exceed the absolute maximum ratings.

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

Never apply signal to the LCD module without power supply.

IC chip (eg. TAB or COG) is sensitive to the light. Strong lighting environment could

possibly cause malfunction. Light sealing structure casing is recommend.

LCD module reliability may be reduced by temperature shock.

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: LM12832BCW-A-Manual-Rev0.1