Model No. WO256128A
►LCD COG Module
►Type: Graphic
►Structure: COG
►Size: 2.93"
►Display Format : 256x128 dots
►IC: ST75256
►+3.3V power supply
►1/128 duty cycle
►Interface : 6800/8080/SPI/I2C
The WO256128A is a monochrome graphic LCD module with a resolution of 256x128 pixels and a diagonal size of 2.93 inches. This module is built with the ST75256 controller IC and supports 6800 8-bit, 8080 8-bit parallel, as well as 4-wire serial SPI and I2C interfaces.
The WO256128A shares the same outline dimensions, viewing area (VA) size, and 3.3V power supply as the WO12864D3, but offers significantly higher resolution and improved performance. It serves as an upgraded version of the WO12864D3 to meet customer demands for higher resolution—without requiring any changes to the mechanical design of existing applications.
This module operates at temperatures ranging from -20℃ to +70℃, with a storage temperature range of -30℃ to +80℃. The WO256128A is available with various LCD mode options, including STN Negative, FSTN Negative (double film), and FSTN Positive, along with LED backlight choices such as white LED. Please contact us for other LCD type or LED combination options.
| Item | Dimension | Unit |
|---|---|---|
| Number of dots | 256 × 128 | － |
| Module dimension | 80.0 × 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 | ST75256i | |
| Interface | 4-Line SPI/IIC/8-bit 6800/8-bit 8080 | |
| 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 |
| Item | Symbol | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage For Logic | VDD-VSS | － | 3 | 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 | － | mA |
| Pin No. | Symbol | Description | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | ITOGND | ESD PIN | |||||||||||||||
| 2 | VG | Power of SEG-drivers | |||||||||||||||
| 3 | V0 | Positive operating voltage of COM-drivers | |||||||||||||||
| 4 | XV0 | Negative operating voltage of COM-drivers | |||||||||||||||
| 5 | CA1P | DC/DC Voltage converte pin | |||||||||||||||
| 6 | CA1N | DC/DC Voltage converte pin | |||||||||||||||
| 7 | VDDA | +3.3V | |||||||||||||||
| 8 | VDD | +3.3V | |||||||||||||||
| 9 | VSS | ground | |||||||||||||||
| 10 | COMSCN | Set scan directing of COM | |||||||||||||||
| 11 | IF1 | These pins select interface operation mode
|
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| 12 | IF0 | ||||||||||||||||
| 13 | CSB | Chip select input pin | |||||||||||||||
| 14 | A0 | Whether the access is related to data or command | |||||||||||||||
| 15 | ERD | Read or write enable terminal | |||||||||||||||
| 16 | RWR | Read/Write execution control pin | |||||||||||||||
| 17 | RSTB | Reset input pin | |||||||||||||||
| 18~25 | D0~D7 | Data bus line | |||||||||||||||
| 26 | ITOGND | ESD PIN |
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