LM12832BCW

LM12832BCW

LCD Module User Manual

Prepared by:

Checked by:

Approved by:

Date: 2011-05-20

Date:

Rev. Descriptions

Release Date

0.1

Preliminary release

2011-05-20

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Document Name: LM12832BCW-Manual-Rev0.1

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LCD Module User Manual

LM12832BCW

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

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

4.8

Display Commands (continue) ............................................................................................................................. 10

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

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LCD Module User Manual

LM12832BCW

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

: 1/33 duty, 1/6 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

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

(See attached Outline Drawing for details)

1.3 Block Diagram

BLA

BLK

Backlight

LCD Panel

128 × 32Pixels

VDD

VSS

GND

IRS

ST7565 or equivalent

/CS1, SCL, SI, /RES, A0

V0~V4, VR, VOUT

CAP1N, CAP1P, CAP2N, CAP2P, CAP3P

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1.4 Terminal Functions

PIN NO

PIN Name

I/O

Descriptions

GND

Supply Connect to VSS

/CS1

Input

Chip Select

/CS=L, enable access to the LCD module

/CS=H, disable access to the LCD module

/RES

Input

Reset signal

/RES = L, Initialization is executed

/RES = H, Normal running.

Input

A0 = H, Transferring the Display Data

A0 = L, Transferring the Control Data

SCL

I/O

Serial clock input

I/O

Serial data input

VDD

Supply Positive power supply

VSS

Supply Negative power supply,0V

VOUT

Power Booster Circuit Output

CAP3P

Power Booster Circuit Capacitance terminals

CAP1N

CAP1P

CAP2P

CAP2N

LCD driving voltage supply terminals

Input

Power Booster Resistor ratio reference input

IRS

Input

Select the resistors for the V0 voltage level adjustment

IRS=H, Using the internal resistors

IRS=L, Not using the internal resistor, the V0 voltage level is

regulated by an external resistive voltage divider attached

to the VR Terminal

GND

Supply Connect to VSS

1.5 Backlight Functions

PIN NO

PIN Name

I/O

Descriptions

BLA

Supply Backlight Positive power supply

BLK

Supply Backlight Negative power supply

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LCD Module User Manual

LM12832BCW

2. Absolute Maximum Ratings

Items

Symbol

Min.

Max.

Unit Condition

Supply Voltage

V DD

-0.3

+3.3

V SS = 0V

Input Voltage

V IN

-0.3

V DD +0.3

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 =3.0V, T OP =25  C

Items

Symbol

MIN.

TYP.

MAX.

Unit Condition /

Application Pin

Operating Voltage

V DD

2.8

3.0

3.3

VDD

Input High Voltage

V IH

0.8xV DD

V DD

/RES, /CS1, A0,

Input Low Voltage

V IL

V SS

0.2xV DD

SCL,SI

Operating Current

I DD

0.2

0.5

mA VDD

3.2 LED Backlight Circuit Characteristics

V BLK =0V,If BLA =29mA, T OP =25  C

Items

Symbol

MIN.

TYP.

MAX.

Unit

Applicable Pin

Forward Voltage

Vf BLA

3.3

BLA

Forward Current

If BLA

BLA

Cautions:

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

BLA

BLK

No. of LED = 3pcs

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LCD Module User Manual

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3.3 AC Characteristics

V SS =0V, V DD =3.0V, T OP =25  C

Item

Symbol

MIN.

TYP.

MAX.

Unit

Serial Clock Period

tscyc

125

Address setup time (A0)

tsas

Address hold time (A0)

tsah

SCL “H” pulse width

tshw

SCL “L” pulse width

tslw

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. CL=100pF

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

3.4 Reset Timing

V SS =0V, V DD =3.0V, T OP =25  C

Item

Symbol

MIN.

TYP.

MAX.

Unit

Reset time

2.5

μs

Reset LOW pulse width

trw

2.5

μs

Note:

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

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LCD Module User Manual

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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

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.

4.2 Application circuit(Example)

- 3x boosting

GND

VSS

IRS

VDD

- 4-Wire SPI mode

VSS

- Using internal ref resistor

- C1~C5=1.0μF (25V)

CAP2N

- C6~C8=1.0μF(25V)

CAP2P

CAP1P

CAP1N

CAP3P

VOUT

VSS

VDD

SCL

Note:

/RES

/CS1

Please refer to the ST7565 data sheet for details

TO MCU

GND

VSS

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.

4.4 Basic Setting

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

- ADC = 0 (normal)

- SHL 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

- Booster Set = 3x

- 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.

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LCD Module User Manual

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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)

128x32 pixels

Column Address

00h



Note:

*1. ADC = 0 (normal)

*2. SHL Selection = 1 (reverse)

*3. Initial Display Line = 0

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LCD Module User Manual

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4.7 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 oin

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.

Set the upper-4-bit of column address counter

(Upper-4-bits)

Upper

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

ADC Select

0 1 0 1 0 1 0 0 0 0

correspondence

ADC= 0,normal . ADC=1, reverse

REV=0, Normal display

Normal/Reverse Display 0 1 0 1 0 1 0 0 1 1

REV=1, Reverse display

EON=0, Normal display

Entire Display ON/OFF

0 1 0 1 0 1 0 0 1 0

EON=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, 1/6 BIAS

BIAS=1, 1/5 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

SHL=0, Normal display

SHL Select

0 1 0 1 1 0 0

* * *

SHL=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)

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 ST7565 data sheet.

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LCD Module User Manual

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4.8 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 1 1 1 1 0 0 0 Select booster ratio

Booster Ratio Set

0 1 0 0 0 0 0 0 0 step 00=2x,3x,4x; 01=5x. 11=6x

Compound Instruction:

Power Save

- - - - - - - - - - -

Display OFF + Entire Display ON

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 ST7565 data sheet.

4.8.1 Power off the LCD Module

It recommends that enter Power Save mode before power off the LCD module.

4.8.2 Refreshing The LCD Module

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

the effect of unexpected noise.

5. Design and Handling Precaution

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

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