Chip on Glass LCD Modules 256x128 with PCB
Model No. WO256128A2
►LCD COG Module
►Graphic LCD
►256x128 dots
►IC: ST75256
►+3.3V power supply
►1/128 duty cycle
►Interface : Default 8080, Option 6800, SPI 4 Line, I2C
Description
The WO256128A2 model is a COG LCD display featuring a PCB board on module with a resolution of 256x128 dots and a diagonal size of 2.9 inches. The module is equipped with an ST75256 controller IC and supports multiple interfaces, including 8080 8-bit parallel (default), 6800 8-bit, and 4-wire serial SPI and I2C. The power supply voltage is 3.3V, and it operates with a 1/128 duty and 1/12 bias.
One of the notable advantages of the WO256128A2 is its PCB board with a circuit layout and screw holes, facilitating easy installation on customer applications. Additionally, it offers three connector pitch sizes: 2.54mm (default), 1.0mm, and 0.5mm. The module also provides the option for a VDD 5V power supply voltage.
Operating within a temperature range of -20℃ to +70℃ and storage temperatures from -30℃ to +80℃, the WO256128A2 is suitable for applications such as measuring instruments, electronic controllers, electronic scales, coffee machines, and more. The module has dimensions of 93.0 × 54.0 mm, with a viewing area size of 66.54 × 33.26 mm.
The WO256128A2 is available in FSTN positive Transflective with a white LED backlight. For inquiries about different LCD types or LED combinations, please feel free to contact us.
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 | |
| Interface | 8080 | |
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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