LM12832BCW-A 128×32 Graphic Display Module
LM12832BCW-A LCD Module User Manual
Product Description:
The LM12832BCW-A is an LCD display module that has a FSTN,
Positive, Transflective display mode. It has a display color of
Dark Gray (*1) when the display data is 1 and Light White (*2) when
the display data is 0. The viewing angle is 6H and the driving
method is 1/33 duty, 1/6 bias. The module has an outline dimension
of 58.0 x 25.5 x 7.8 (mm) excluding FPC terminal.
The module has several terminal functions including GND, /CS1,
/RES, A0, SCL, SI, VDD, VSS, NC, V0, XV0, VG, BLA, and BLK. These
terminals have varying functions such as power supply,
input/output, and no connection. The backlight functions are also
available with BLA and BLK as the backlight positive and negative
power supply respectively.
Product Usage Instructions:
Before using the LM12832BCW-A LCD module, refer to the product
manual for basic specifications, absolute maximum ratings,
electrical characteristics, function specifications, design and
handling precaution.
Connect the module to a power supply by connecting GND to VSS,
VDD to a positive power supply, and VSS to a negative power supply
of 0V. Connect the backlight functions by connecting BLA to the
backlight positive power supply and BLK to the backlight negative
power supply.
To enable access to the LCD module using /CS1, set /CS to L. To
disable access to the LCD module, set /CS to H. To initialize the
module, set /RES to L. To run normally, set /RES to H. To transfer
display data, set A0 to H. To transfer control data, set A0 to
L.
For optimal display result, fine contrast adjustment function is
necessary in the application design. Note that the color tone may
slightly change by temperature and driving condition.
Refer to the manual for more information on the terminal
functions and block diagram of the module.
LM12832BCW-A
LCD Module User Manual
Prepared by: Gonghuimei
Date: 2023-03-28
Checked by: Date:
Approved by: Date:
Rev. 0.1 0.2
Descriptions
Preliminary release Update Ouline Dwg
URL: www.topwaydisplay.com
Release Date 2021-09-28 2023-03-28
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LCD Module User Manual
LM12832BCW-A
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
5. Design and Handling Precaution………………………………………………………………………………..10
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LCD Module User Manual
LM12832BCW-A
1. Basic Specifications
1.1 Display Specifications
1) LCD Display Mode 2) Display Color
3) Viewing Angle 4) Driving Method
: FSTN, Positive, Transflective : Display Data = “1” : Dark Gray(*1) : Display Data = “0” : Light White (*2) : 6H : 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
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1.4 Terminal Functions
PIN NO 1
PIN Name I/O
GND
Supply Connect to VSS
Descriptions
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
NC
— No connection
10
NC
—
11
V0
Supply LCD driving voltage for common circuits at negative frame
12
XV0
Supply LCD driving voltage for common circuits at positive frame
13
NC
—
14
NC
—
15
NC
— No connection
16
NC
—
17
NC
—
18
NC
—
19
VG
Supply LCD driving voltage for segment circuits
20
NC
— No connection
21
NC
—
22
GND
Supply Connect to VSS
1.5 Backlight Functions
PIN NO 1
PIN Name I/O
Descriptions
BLA
Supply Backlight Positive power supply
2
BLK
Supply Backlight Negative power supply
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2. Absolute Maximum Ratings
Items
Symbol Min.
Max. Unit Condition
Supply Voltage
VDD
-0.3
+4.0
V VSS = 0V
Input Voltage
VIN
-0.3
VDD+0.3
V VSS = 0V
Operating Temperature
TOP
-20
+70
C No Condensation
Storage Temperature
TST
-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
Items
Operating Voltage Input High Voltage Input Low Voltage Operating Current
Symbol
VDD VIH VIL IDD
MIN.
3.0 0.7xVDD
VSS –
TYP.
3.3 –
0.2
VSS=0V, VDD=3.3V, TOP=25C
MAX. Unit Condition /
Application Pin
3.6
V VDD
VDD 0.3xVDD
V /RES, /CS1, A0, V SCL,SI
0.5
mA VDD
3.2 LED Backlight Circuit Characteristics
VBLK=0V,IfBLA=45mA, TOP =25C
Items
Symbol MIN. TYP. MAX. Unit Applicable Pin
Forward Voltage
VfBLA
–
3.3
–
V
BLA
Forward Current
IfBLA
–
45
50
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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3.3 AC Characteristics
LCD Module User Manual
LM12832BCW-A
Item
Symbol
Serial Clock Period
tscyc
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. All timing is using 20% and 80% of VDD as the reference.
MIN. 50 20 10 25 25 20 10 20 40
3.4 Reset Timing
VSS=0V, VDD=3.3V, TOP=25C
TYP.
MAX.
Unit
–
–
ns
–
–
ns
–
–
ns
–
–
ns
–
–
ns
–
–
ns
–
–
ns
–
–
ns
–
–
ns
Item
Symbol
Reset time
tr
Reset LOW pulse width
trw
Note:
*1.All timing is using 20% and 80% of VDD as the reference.
MIN. –
1.0
VSS=0V, VDD=3.3V, TOP=25C
TYP.
MAX.
Unit
–
1.0
s
–
–
s
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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)
– 4-Wire SPI mode – Using internal ref resistor – C1=0.1uF~1.0uF(25V) – C2=0.1uF~1.0uF(25V) – R1=500K~1M
Note: 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.
4.4 Basic Setting
To drive the LCD module correctly and provide normally display, please use the following setting – MX = 0 (normal) – 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
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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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
2
:
128×32 pixels
D7
D0
3
:
D7
Column Address
00h
7F
Note: *1. MX = 0 (normal)
*2. MY Selection = 1 (reverse) *3. Initial Display Line = 0
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4.7 Display Commands
INSTRUCTION
LCD Module User Manual
COMMAND BYTE
LM12832BCW-A DESCRIPTION
A0 /RD /WR D7 D6 D5 D4 D3 D2 D1 D0
(1) Display ON/OFF
0 10 1 0 1
0
1
1
1
D D=1, display ON
D=0, display OFF
(2) Set Start Line
0 1 0 0 1 S5 S4 S3 S2 S1 S0 Set display start line
(3) Set Page Address 0 1 0 1 0 1
1 Y3 Y2 Y1 Y0 Set page address
(4)Set Column Address 0 1 0 0 0 0
1 X7 X6 X5 X4 Set column address (MSB)
0 10 0 0 0
0 X3 X2 X1 X0 Set column address (LSB)
(5) Read Status
0 0 1 0 MX D RST 0
0
0
0 Read IC Status
(6) Write Data
1 1 0 D7 D6 D5 D4 D3 D2 D1 D0 Write display data to RAM
(7) Read Data
1 0 1 D7 D6 D5 D4 D3 D2 D1 D0 Read display data from RAM
Set scan direction of SEG
(8) SEG Direction
0 10 1 0 1
0
0
0
0 MX MX=1, reverse direction
MX=0, normal direction
(9) Inverse Display
0 10 1 0 1
0
0
1
1 INV INV =1, inverse display
INV =0, normal display
(10) All Pixel ON
0 10 1 0 1
0
0
1
0 AP AP=1, set all pixel ON
AP=0, normal display
(11) Bias Select
0 10 1 0 1
0
0
0
1 BS Select bias setting
0=1/9; 1=1/7 (at 1/65 duty)
(12) Read-modify-Write 0 1 0 1 1 1
0
0
0
0
0 Column address increment:
Read:+0 , Write:+1
(13) END
0 10 1 1 1
0
1
1
1
0 Exit Read-modify-Write
mode
(14) RESET
0 10 1 1 1
0
0
0
1
0 Software reset
Set output direction of COM
(15) COM Direction
0 10 1 1 0
0 MY –
–
– MY=1, reverse direction
MY=0, normal direction
(16) Power Control
0 10 0 0 1
0
1 VB VR VF Control built-in power circuit
ON/OFF
(17) Regulation Ratio 0 1 0 0 0 1
0
0 RP1 RP1 RP0 Select regulation resistor
ratio
0 10 1 0 0
0
0
0
0
1 Double command!! Set
(18) Set EV
0 1 0 0 0 EV5 EV4 EV3 EV2 EV1 EV0 electronic volume (EV) level
0 10 1 1 1
1
1
0
0
0 Double command!!
Set booster level:
(19) Set Booster
0 10 0 0 0
0
0
0
0 BL BL=0: 4X
BL=1: 5X
(20) Power Save
0 10
Compound Command
Display OFF + All Pixel ON
(21) NOP
0 10 1 1 1
0
0
0
1
1 No operation
(22) SPI Read Status 0 1 1 1 1 1
1
1
1
0
0 SPI read status command
0 1 1 0 MX D RST ID3 ID2 ID1 ID0
(23) SPI Read DDRAM 0 1 1 1 1 1
1
1
1
0
1 SPI read DDRAM command
1 1 1 D7 D6 D5 D4 D3 D2 D1 D0
Note: *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.
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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
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