4 Line LCD Display

4 line LCD display ADM2004D
Number of characters:20X4
Number of dots:5X8
Built-in controller:ST7066 or equivalent
Duty cycle:Duty cycle
power supply:+5V (also available for =3.0V)

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Product Details

4 line LCD display

Description of 4 line LCD display ADM2004D

Item

Specification

Number of characters

20X4

Number of dots

5X8

Built-in controller

ST7066 or equivalent

Duty cycle

1/16

power supply

+5V (also available for   =3.0V)

Backlight optional

Yellow-green / white /RGB

interface

4-bit or 8-bit MPU

 

4 line LCD display ADM2004D is 20 characters wide with 4 rows. The Connection port is 0.1" pitch, single row for easy breadboarding and wiring. 4 line LCD display ADM2004D hasSingle LED backlight with a resistor included, you can power it directly from 5V. If it's too bright for you, it can be dimmed easily with a resistor or PWM .Can be fully controlled with only 6 digital lines! It’s Built in character set supports English/Japanese/European/Russian text.


Outline dimension of 4 line LCD display ADM2004D

Unit: mm

image002.jpg


Absolute maximum ratings of 4 line LCD display ADM2004D

Item

Symbol

Standard

Unit

Power voltage

VDD-VSS

-0.3

-

7.0

V

Input voltage

VIN

-0.3

-

VDD+0.3

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

image004.jpg

 

Interface pin description of 4 line LCD display ADM2004D

Pin no.

Symbol

External connection

Function

1

VSS

Power supply

Signal ground for LCM (GND)

2

VDD

Power supply for logic 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

LED+

LED BKL power
Supply

Power supply for BKL (Anode)

16

LED-

Power supply for BKL (GND)

 

Contrast adjust

image006.jpg

   

VDD~V0: LCD Driving voltage

VR: 10k~20k


Electrical characteristics

DC characteristics

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Supply voltage for LCD

VDD-V0

Ta =25℃

-

4.5

-

V

Input voltage

VDD

 

4.7

-

5.5

Supply current

IDD

Ta=25℃, VDD=5.0V

-

1.5

3

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

 

 

 

-


Instruction table

Instruction

Instruction code

Description

Execution Time (fosc=270 KHZ

RS

R/W

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

Clear Display

0

0

0

0

0

0

0

0

0

1

Write “20H” to DDRA and set DDRAM address to “00H” from AC

1.53ms

Return Home

0

0

0

0

0

0

0

0

1

-

Set DDRAM address to “00H”  From AC and return cursor to Its original position if shifted. The contents of DDRAM are not changed.

1.53ms

Entry mode Set

0

0

0

0

0

0

0

1

I/D

SH

Assign cursor moving direction And blinking of entire display

39us

Display ON/ OFF control

0

0

0

0

0

0

1

D

C

B

Set display (D), cursor (C), and Blinking of cursor (B) on/off Control bit.

 

Cursor or Display shift

0

0

0

0

0

1

S/C

R/L

-

-

Set cursor moving and display
Shift control bit, and the
Direction, without changing of DDRAM data.

39us

Function set

0

0

0

0

1

DL

N

F

-

-

Set interface data length (DL: 8- Bit/4-bit), numbers of display Line (N: =2-line/1-line) and, Display font type (F: 5x11/5x8)

39us

Set CGRAM  Address

0

0

0

1

AC5

AC4

AC3

AC2

AC1

AC0

Set CGRAM address in address
 Counter.

39us

Set DDRAM Address

0

0

1

AC6

AC5

AC4

AC3

AC2

AC1

AC0

Set DDRAM address in address
 Counter.

39us

 Read busy Flag and Address

0

1

BF

AC6

AC5

AC4

AC3

AC2

AC1

AC0

Whether during internal
Operation or not can be known By reading BF. The contents of Address counter can also be read.

0us

Write data to Address

1

0

D7

D6

D5

D4

D3

D2

D1

D0

Write data into internal RAM (DDRAM/CGRAM).

43us

Read data From RAM

1

1

D7

D6

D5

D4

D3

D2

D1

D0

Read data from internal RAM (DDRAM/CGRAM).

43us


NOTE: 

When an MPU program with checking the busy flag (DB7) is made, it must be necessary 1/2fosc is necessary for executing the next instruction by the falling edge of the “E” signal after the busy flag (DB7) goes to “Low”.


DDRAM address:

Display position

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

00

01

02

03

04

05

06

07

08

09

0A

0B

0C

0D

0E

0F

10

11

12

13

40

41

42

43

44

45

46

47

48

49

4A

4B

4C

4D

4E

4F

50

51

52

53

14

15

16

17

18

19

1A

1B

1C

1D

1E

1F

20

21

22

23

24

25

26

27

54

55

56

57

58

59

5A

5B

5C

5D

5E

5F

60

61

62

63

64

65

66

67

DDRAM address


Standard character pattern of 4 line LCD display ADM2004D

image007.jpg

image009.jpg

 

FAQ:

What is the Difference Between Passive STN Segment, Alphanumeric, and Graphic Displays?

Passive STN (Super Twisted Nematic) displays come in three major types:

1) Segment

2) Alphanumeric / Character

3) Graphic


Let’s take a closer look at these 3 types of displays.

Segment LCDs

A Segment display is the type of thing you see in gas pumps, calculators, or simple meters. It can usually show a few numeric digits and perhaps a few icons or symbols.

image010.jpg

These displays are typically used where a very low cost is needed and fixed function display is acceptable.

Alphanumeric / Character LCDs

A character LCD can show a fixed set of numbers and letters in a simple 5×8 dot monospaced font.

The font is stored in the LCD’s controller (the CGROM), so when you want to display an “A”, you simply send over the ASCII code for “A.”

Alphanumeric / character LCDs are typically a nice combination of low cost, good function, and ease of application.

image011.jpg


Graphic LCDs

A graphic LCD has a regular array of dots, that can be turned on in any pattern to show any image, letters, numbers, or symbols. Graphic LCDs offer the most flexibility, but take more computing power, since every single dot has to be managed.

The current generation of embedded microcontrollers is quite powerful though, and most can easily handle the extra load of a graphic LCD.

A graphic LCD is the best solution to assure that you have future flexibility in your user interface design.

image013.jpg

 


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