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Character Monochrome Display

Character monochrome display
Character monochrome display ADM0801B
Model No. ADM0801B
►character monochrome display
►Character LCD

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Product Details

Character monochrome display

Character monochrome display ADM0801B

Model No. ADM0801B

►character monochrome display

►Character LCD

►5 x 8 dots includes cursor

►Built-in controller ST7066

►5V power supply

►1/8 duty cycle

Description of character monochrome display ADM0801B

Features

1.5x8 dots

2.Built-in controller (ST7066 or equivalent)

3.+5V power supply

4.Parallel interface input

5.1/8 duty

6.Without LED backlight

7.8x1 character

Outline dimension

1(001).jpg

Absolute maximum ratings

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

2.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 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

Contrast adjust

3(001).jpg

VDD~V0: LCD Driving voltage

VR: 10k~20k

Optical characteristics

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

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Viewing angle

θ

Cr≥4

-25

-

-

deg

Φ

-30

-

30

Contrast ratio

Cr


-

8

-

-

Response time (rise)

Tr

-

-

120

150

ms

Response time (fall)

Tr

-

-

120

150

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


-

10

-

-

Response time (rise)

Tr

-

-

200

250

ms

Response time (fall)

Tr

-

-

300

350

Electrical characteristics

DC characteristics

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Supply voltage for LCD

VDD-V0

Ta =25℃

-

4.6

-

V

Input voltage

VDD


4.7

-

5.5

Supply current

IDD

Ta=25℃, VDD=5.0V

-

1.5

2.5

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

230

-

-

Enable rise/fall time

tr, tf

-

-

20

RS; R/W setup time

tsu

RS; R/W

40

-

-

RS; R/W address hold time

th

10

-

-

Data output delay

td

DB0~DB7

-

-

120

Data hold time

tdh

5

-

-

Write 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

230

-

-

Enable rise/fall time

tr, tf

-

-

20

RS; R/W setup time

tsu1

RS; R/W

40

-

-

RS; R/W address hold time

th1

10

-

-

Data output delay

tsu2

DB0~DB7

80

-

-

Data hold time

th2

10

-

-

4.jpg

Instruction description

1. Outline

To overcome the speed difference between the internal clock of ST7066 and the MPU clock, ST7066 performs internal operations by storing control in formations to IR or DR. The internal operation is determined according to the signal from MPU, composed of read/write and data bus (Refer to Table7).

Instructions can be divided largely into four groups:

1)ST7066 function set instructions (set display methods, set data length, etc.)

2)Address set instructions to internal RAM

3)Data transfer instructions with internal RAM

4)Others

The address of the internal RAM is automatically increased or decreased by 1.

Note: during internal operation, busy flag (DB7) is read “High”.

Busy flag check must be preceded by the next instruction.

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

2.Read data from RAM

RS

R/W

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

1

1

D7

D6

D5

D4

D3

D2

D1

D0

Read binary 8-bit data from DDRAM/CGRAM.

The selection of RAM is set by the previous address set instruction. If the address set instruction of RAM is not performed before this instruction, the data that has been read first is invalid, as the direction of AC is not yet determined. If RAM data is read several times without RAM address instructions set before, read operation, the correct RAM data can be obtained from the second. But the first data would be incorrect, as there is no time margin to transfer RAM data.

In case of DDRAM read operation, cursor shift instruction plays the same role as DDRAM address set instruction,

It also transfers RAM data to output data register.

After read operation, address counter is automatically increased/decreased by 1 according to the entry mode.

After CGRAM read operation, display shift may not be executed correctly.

NOTE: In case of RAM write operation, AC is increased/decreased by 1 as in read operation.

At this time, AC indicates next address position, but only the previous data can be read by the read instruction.

3.LCM Operation Precautions

(1) It is an indispensable condition to drive LCD within the specified voltage limit since the higher voltage than the limit causes the shorter LCD life. An electrochemical reaction due to direct current causes LCD's undesirable deterioration, so that the use of direct current driver should be avoided.

(2) Response time will be extremely delayed at lower temperature than the specified operating temperature range and on the other hand LCD's show dark blue color in the higher temperature. However, those phenomena do not mean any malfunction or display out of order with LCD's, which will come back in the specified operation temperature range.

(3) If the display area is pushed hard during operation, some fonts will be abnormally displayed. But it resumes normal condition after turning off once.

(4) A slight dew depositing on terminals could be a cause for electrochemical reaction resulting in terminal open circuit.

(5) Display contrast varies with the change of liquid crystal driving voltage (VO). Adjust VO to show the best contrast.

(6) Condensation on terminals can cause an electrochemical reaction disrupting the terminal circuit. Therefore, it is suggested to use the LCD under the relative condition of 40°C, 85% RH.

(7) When turning the power on, input each signal after the positive/negative voltage becomes stable.

5.jpg

(8) The backlight must be operated within the condition of specification. The overload current or too high voltage will reduce the life time or destroy the backlight.

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