Low Cost LCD Display Module

Low cost LCD display module
Low cost LCD display module ADM12832E
Model No. ADM12832E
►low cost LCD display module 128x32, Display LCD 128x32
►Monochrome Graphic LCD

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Product Details

Low cost LCD display module

Low cost LCD display module ADM12832E

Model No. ADM12832E

►low cost LCD display module 128x32, Display LCD 128x32

►Monochrome Graphic LCD

►Built-in controller ST7920

►1/32duty

►64x256 bit graphic display RAM

Description of low cost LCD display module ADM12832E

ADM12832E is of very low cost LCD display module. It’s dimension is 84*44, and VA dimension is 64 *17.9mm. It has Strong display control functions :Vertical scroll, horizontal bit scroll, line reverse etc. Looking for more low cost LCD display modules , please check Amotec Display.

Features

1、 128x32 dots

2、 Built-in controller (ST7920)

3、 128 alpha-numerical fonts (16x8)

4、 64x256 bit graphic display RAM

5、 Strong display control functions:

Vertical scroll, horizontal bit scroll, line reverse etc

6、 1/32 duty

7、 4 bit, 8 bit, serial interface

Outline dimension

1(001).jpg2(001).jpg

Absolute maximum ratings

Item

Symbol

Standard

Unit

Power voltage

VDD-VSS

0

-

7.0


V

Input voltage

VIN

VSS

-

VDD

Operating temperature range

Top

0

-

+50


Storage temperature range

Tst

-10

-

+60

*Wide temperature range is available

(operating/storage temperature as –20~+70/-30~+80℃)

Block diagram

3.jpg

Interface pin description

Pin no.

Symbol

External

connection

Function

1

VSS


Power supply

Signal ground for LCM (GND)

2

VDD

Power supply for logic (+5V) for LCM

3

V0

Contrast adjust

4

RS

MPU

Register select signal

5

R/W

MPU

Read/write select signal

6

E

MPU

Operation (data read/write) enable signal


7~10


DB0~DB3


MPU

Four low order bi-directional three-state data bus lines.
Used for data transfer between the MPU and the LCM. These four are not used during 4-bit operation.


11~14


DB4~DB7


MPU

Four high order bi-directional three-state data bus lines.
Used for data transfer between the MPU

15

RST


Reset signal

16

VOUT


Double voltage output for LCD

17

A

LED BKL power
supply

Power supply for BKL

18

K

Power supply for BKL (GND)

Optical characteristics

STN type display module (Ta=25℃, VDD=5.0V)

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Viewing angle

θ


Cr≥2

-60

-

35


deg

Φ

-40

-

40

Contrast ratio

Cr


-

6

-

-

Response time (rise)

Tr

-

-

150

250


ms

Response time (fall)

Tr

-

-

150

250

Electrical characteristics

DC characteristics

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Supply voltage for LCD

VDD-V0

Ta =25℃ V=+5V

-

6.5

-

V

Input voltage

VDD

V=+5V

4.5

5.0

5.5

Supply current

IDD

Ta=25℃, VDD=5.0V

-

2.0

3.5

mA

Input leakage current

ILKG


-

-

1.0

uA

“H” level input voltage

VIH


2.2

-

VDD



V

“L” level input voltage

VIL

Twice initial value or less

0

-

0.6

“H” level output voltage

VOH

LOH=-0.25mA

2.4

-

-

“L” level output voltage

VOL

LOH=1.6mA

-

-

0.4

Backlight supply voltage

VF


-

-

-

Read cycle (Ta=25℃, VDD=5.0V)

Parameter

Symbol

Test pin

Min.

Typ.

Max.

Unit

Enable cycle time

tc


E

500

-

-



ns

Enable pulse width

tw

300

-

-

Enable rise/fall time

tr, tf

-

-

25

RS; R/W setup time

tsu

RS; R/W RS; R/W

100

-

-

RS; R/W address hold time

th

10

-

-

Read data output delay

td


DB0~DB7

60

-

90

Read data hold time

tdh

20

-

-

7.jpg

FAQ

1.LCD Driver Circuit

LCD DRIVER CIRCUIT HAS 33 COMMON AND 64 SEGMENT SIGNALS FOR LCD DRIVING. DATA FROM CGRAM/CGROM IS TRANSFERRED TO 64 BIT SEGMENT LATCH SERIALLY, AND THEN IT IS

STORED TO 64 BIT SHIFT LATCH. WHEN EACH COMMON IS SELECTED BY 33 BIT COMMON REGISTER, SEGMENT DATA ALSO OUTPUT THROUGH, SEGMENT DRIVER FROM 64 BIT SEGMENT LATCH.

2.Serial Interface & Transferring Serial Data

The ST7920 enters serial mode when the psb pin is set low. A two-line clock synchronous transfer method is used. The st7920 receives serial input data(sid) by synchronizing with a transfer clock(sclk) sent from the master side. When the st7920 interfaces with several chips, chip select pin(cs) must be used. The transfer clock(sclk) input is activated by making chip select(cs) high. In addition, the transfer counter of the st7920 can be reset and serial transfer synchronized by making chip select(cs) low. Here, since the data which was being sent at reset is cleared, restart the transfer from the first bit of this data. In a minimum system where a single st7920 interfaces to a single mpu, an interface can be constructed from the transfer clock(sclk) and serial input data(sid). In this case, chip select(cs) should be fixedto high.

The transfer clock(sclk) is independent of operational clock of the st7920. however, when several instructions are continuously transferred, the instruction execution time determined by the operational clock must be considered since the st7920 does not have an internal transmit/receive buffer. Following figure shows the basic procedure for transferring serial data. To begin with, transfer the start byte. By receiving five consecutive bits of 1(synchronizing bit string) at the beginning of the start byte, the transfer counter of the st7920 is reset and serial transfer is synchronized. The 2 bits following the synchronizing bit string(5 bits) specify transfer direction(rw bit) and register select(rs bit). Be sure to transfer 0 in the 8 th bit.

After receiving the start synchronizing bit string, the rw bit(=0), and rs bit in the start byte, an 8-bit instruction is received in 2 bytes: the higher 4 bits of the instruction are placed in the lsb of the first byte, and the lower 4 bits of the instruction are placed in the lsb of the second byte. Be sure to transfer 0 in the following 4 bits of each byte.

4.jpg

3.Safety

(1) It is recommended to crush damaged or unnecessary LCDs into pieces and wash them off with solvents such as acetone and ethanol, which should later be burned.

(2) If any liquid leaks out of a damaged glass cell and comes in contact with the hands, wash off thoroughly with soap and water.

4.Others

Liquid crystals solidify under low temperature (below the storage temperature range) leading to defective orientation or the generation of air bubbles (black or white). Air bubbles may also be generated if the module is subject to a low temperature. If the LCD modules have been operating for a long time showing the same display patterns, the display patterns may remain on the screen as ghost images and a slight contrast irregularity may also appear. A normal operating status can be regained by suspending use for some time. It should be noted that this phenomenon does not adversely affect performance reliability. To minimize the performance degradation of the LCD modules resulting from destruction caused by static electricity etc., exercise care to avoid holding the following sections when handling the modules.

- Exposed area of the printed circuit board.

- Terminal electrode sections.

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