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LM12832BCW
LCD Module User Manual
Prepared by:
Checked by:
Approved by:
Date: 2011-05-20
Date:
Date:
Rev. Descriptions
Release Date
0.1
Preliminary release
2011-05-20
URL: www.topwaydisplay.com
Document Name: LM12832BCW-Manual-Rev0.1
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TOPWAY
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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Document Name: LM12832BCW-Manual-Rev0.1
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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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Document Name: LM12832BCW-Manual-Rev0.1
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LCD Module User Manual
LM12832BCW
1.4 Terminal Functions
PIN NO
PIN Name
I/O
Descriptions
1
GND
Supply Connect to VSS
2
/CS1
Input
Chip Select
/CS=L, enable access to the LCD module
/CS=H, disable access to the LCD module
3
/RES
Input
Reset signal
/RES = L, Initialization is executed
/RES = H, Normal running.
4
A0
Input
Register Select
A0 = H, Transferring the Display Data
A0 = L, Transferring the Control Data
5
SCL
I/O
Serial clock input
6
SI
I/O
Serial data input
7
VDD
Supply Positive power supply
8
VSS
Supply Negative power supply,0V
9
VOUT
--
Power Booster Circuit Output
10
CAP3P
--
Power Booster Circuit Capacitance terminals
11
CAP1N
--
12
CAP1P
--
13
CAP2P
--
14
CAP2N
--
15
V4
--
LCD driving voltage supply terminals
16
V3
--
17
V2
--
18
V1
--
19
V0
--
20
VR
Input
Power Booster Resistor ratio reference input
21
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
22
GND
Supply Connect to VSS
1.5 Backlight Functions
PIN NO
PIN Name
I/O
Descriptions
1
BLA
Supply Backlight Positive power supply
2
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
V SS = 0V
Input Voltage
V IN
-0.3
V DD +0.3
V
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
V
VDD
Input High Voltage
V IH
0.8xV DD
-
V DD
V
/RES, /CS1, A0,
Input Low Voltage
V IL
V SS
-
0.2xV DD
V
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
-
V
BLA
Forward Current
If BLA
-
29
51
mA
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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Document Name: LM12832BCW-Manual-Rev0.1
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LCD Module User Manual
LM12832BCW
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
-
-
ns
Address setup time (A0)
tsas
38
-
-
ns
Address hold time (A0)
tsah
25
-
-
ns
SCL “H” pulse width
tshw
63
-
-
ns
SCL “L” pulse width
tslw
63
-
-
ns
Data setup time
tsds
38
-
-
ns
Data hold time
tsdh
25
-
-
ns
CS-SCL time
tcss
38
-
-
ns
CS-SCL time
tcsh
75
-
-
ns
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
tr
-
-
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
LM12832BCW
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)
22
- 3x boosting
GND
21
VSS
IRS
20
VDD
-
VR
19
V0
18
- 4-Wire SPI mode
V1
17
V2
VSS
- Using internal ref resistor
16
V3
15
V4
- C1~C5=1.0μF (25V)
14
CAP2N
13
C6
- C6~C8=1.0μF(25V)
CAP2P
12
CAP1P
11
C7
CAP1N
10
CAP3P
9
VOUT
8
C8
VSS
VSS
7
VSS
VDD
6
VDD
SI
5
SCL
4
A0
Note:
3
/RES
2
/CS1
Please refer to the ST7565 data sheet for details
1
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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Document Name: LM12832BCW-Manual-Rev0.1
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LCD Module User Manual
LM12832BCW
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)
D0
0
:
D7
D0
1
:
D7
D0
128x32 pixels
2
:
D7
D0
3
:
D7
Column Address
00h
7F
Note:
*1. ADC = 0 (normal)
*2. SHL Selection = 1 (reverse)
*3. Initial Display Line = 0
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Document Name: LM12832BCW-Manual-Rev0.1
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LCD Module User Manual
LM12832BCW
4.7 Display Commands
Code
No. Instructions
Function
DON=0, display off
1
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
2
Display start line set
0 1 0 0 1
address
address
Page
3
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
4
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
5
Read Status
0 0 1 Status
0 0 0 0
6
Write Display Data
1 1 0
Write Data
Write data into the display RAM
7
Read Display Data
1 0 1
Read Data
Read data form the display RAM
Sets the display RAM address SEG output
8
ADC Select
0 1 0 1 0 1 0 0 0 0
correspondence
ADC= 0,normal . ADC=1, reverse
REV=0, Normal display
9
Normal/Reverse Display 0 1 0 1 0 1 0 0 1 1
REV=1, Reverse display
EON=0, Normal display
10
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
11
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
12
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”
13
Reset Read-Modify-Write 0 1 0 1 1 1 0 1 1 1 0 Clear the “Read-Modify-Write” mode
14
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
15
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
16
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
17
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
LM12832BCW
4.8 Display Commands (continue)
Code
No. Instructions
Function
18
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)
19
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
20
Compound Instruction:
Power Save
- - - - - - - - - - -
Display OFF + Entire Display ON
21
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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