Character monochrome display
Character monochrome display ADM0801B
Model No. ADM0801B
►character monochrome display
►Character LCD
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
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
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. |
11~14 |
DB4~DB7 |
MPU |
Four high order bi-directional three-state data bus lines. |
Contrast adjust
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 |
- |
- |
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.
(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.