Chip on Glass LCD Modules 256x128 with PCB
Model No. WO256128A2
►LCD COG Module
►Graphic LCD
►256x128 dots
►Built-in controller ST75256
►+3.3V power supply
►1/128 duty cycle
►Interface : Default 8080, Option 6800, SPI 4 Line, I2C
DESCRIPTION
WO256128A2 model is a COG LCD display WO256128A model featured with a PCB board on module which is made of 256x128 dots, diagonal size 2.9 inch. WO256128A2 is built in with ST75256 controller IC, it supports 8080 8-bit parallel (default), 6800 8-bit and 4-wire serial SPI and I2C interface, power supply voltage 3.3V, 1/128 duty, 1/12 Bias. The advantage of WO256128A2 is having circuit layout on PCB board and with screw holes which make modules can be fixed on customers’ applications easily. Also, there are three kinds of connector pitch sizes of 2.54mm (default), 1.0mm and 0.5mm for options. WO256128A2 also have VDD 5V power supply voltage for optional.
WO256128A2 module can be operating at temperatures from -20℃ to +70℃; its storage temperatures range from -30℃ to +80℃. The WO256128A2 is available for FSTN positive Transflective with white LED backlight. Please contact us if you need different types of LCDs or LED combinations.
DRAWING
SPECIFICATIONS
Interface Pin Function
| Pin No. | Symbol | Description |
|---|---|---|
| 1 | VDD | +3.3V |
| 2 | NC | No connection |
| 3 | VSS | ground |
| 4 | CSB | Chip select input pin |
| 5 | A0 | Whether the access is related to data or command |
| 6 | ERD | Read or write enable terminal |
| 7 | RWR | Read/Write execution control pin |
| 8 | RSTB | Reset input pin |
| 9~16 | D0~D7 | Data bus line |
| 17 | A | LED+ |
| 18 | K | LED- |
Mechanical Data
| Item | Dimension | Unit |
|---|---|---|
| Number of dots | 256 × 128 | － |
| Module dimension | 93.0 × 54.0 × 9.5 | mm |
| View area | 70.7 × 38.8 | mm |
| Active area | 66.54 × 33.26 | mm |
| Dot size | 0.24 × 0.24 | mm |
| Dot pitch | 0.26 × 0.26 | mm |
| Drive Method | 1/128 Duty, 1/12 Bias | |
| Backlight Type | LED | |
| IC | ST75256 | |
Absolute Maximum Ratings
| Item | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Operating Temperature | TOP | -20 | － | +70 | ℃ |
| Storage Temperature | TST | -30 | － | +80 | ℃ |
| MPU Interface Input Voltage | VIN | -0.3 | － | VDD+0.3 | V |
| Digital Power Supply Voltage | VDD-VSS | -0.3 | － | 4.0 | V |
| LCD Power supply voltage | V0- XV0 | -0.3 | － | 19.0 | V |
Electrical Characteristics
| Item | Symbol | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage For Logic | VDD-VSS | － | 3.0 | 3.3 | 3.6 | V |
| Supply Voltage For LCM | VOP | Ta=-20℃ Ta=25℃ Ta=70℃ |
－ 14.2 － |
－ 14.5 － |
－ 14.8 － |
V V V |
| Input High Volt. | VIH | － | 0.7 VDD | － | VDD | V |
| Input Low Volt. | VIL | － | VSS | － | 0.3 VDD | V |
| Output High Volt. | VOH | － | 0.8 VDD | － | VDD | V |
| Output Low Volt. | VOL | － | VSS | － | 0.2 VDD | V |
| Supply Current | IDD | VDD=3.3V | － | 1.5 | 2.0 | mA |
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