Model No. WEX025664B
►Type: Graphic
►Structure: COF
►Size: 3.12 inch OLED
►256 x 64 Dot Matrix
►IC：SSD1322
►3V Power supply
►1/64 duty
►Interface: 6800, 8080, SPI
►Display Color: White / Yellow / Sky Blue / Green
►Support Grayscale
WEX025664B is a 3.12-inch COF graphic OLED display module featuring a 256x64 resolution and Chip-on-Film (COF) structure. The module measures 88.0 × 27.8 × 2.15 mm, with an active area of 76.778 × 19.178 mm. Its elongated display format is suitable for equipment designs requiring a compact display area for text, graphics, and status information.
This 256x64 OLED display integrates the SSD1322 driver IC and supports 6800/8080 8-bit parallel interfaces and 3-wire/4-wire SPI for connection to different host systems. The module supports 4-bit grayscale, allowing graphical information to be displayed at different intensity levels. It uses a 1/64 duty driving method and supports an operating temperature range of -40°C to +80°C, with a storage temperature range of -40°C to +85°C.
WEX025664B operates with a logic supply voltage (VDD) of 2.4V to 2.6V (2.5V typical), a low-voltage supply (VCI) of 2.4V to 3.5V (3.0V typical), and a display driving voltage (VCC) of 11.5V to 15V (14.5V typical). The I/O supply voltage (VDDIO) ranges from 1.65V to VCI (3.0V typical). These electrical requirements should be considered when designing the power supply and interface circuitry.
WEX025664B is suitable for industrial equipment, embedded systems, meters, handheld instruments, POS systems, IoT devices, communication equipment, and medical instruments requiring a compact graphic OLED display with grayscale support. It can also be considered for server front-panel monitoring interfaces, where available space and the information to be displayed are important design considerations.
For applications requiring different mechanical structures or touch options, related models are available:
For more information on OLED display integration in 2U server front panels, see PMOLED Applications and Design for 2U Server Local Monitoring Interfaces.
| Item | Dimension | Unit |
|---|---|---|
| Dot Matrix | 256 x 64 Dots | － |
| Module dimension | 88.0 × 27.8 × 2.15 | mm |
| Active Area | 76.778×19.178 | mm |
| Pixel Size | 0.278×0.278 | mm |
| Pixel Pitch | 0.3×0.3 | mm |
| Display Mode | Passive Matrix | |
| Display Color | Monochrome | |
| Drive Duty | 1/64 Duty | |
| Gray Scale | 4 bits | |
| IC | SSD1322 (COF) | |
| Interface | 6800, 8080, SPI | |
| Size | 3.12 inch | |
| Parameter | Symbol | Min | Max | Unit |
|---|---|---|---|---|
| Supply Voltage for Operation | VCI | -0.3 | 4 | V |
| Supply Voltage for Logic | VDD | -0.5 | 2.75 | V |
| Supply Voltage for I/O Pins | VDDIO | -0.5 | VCI | V |
| Supply Voltage for Display | VCC | -0.5 | 20 | V |
| Operating Temperature | TOP | -40 | 80 | °C |
| Storage Temperature | TSTG | -40 | 85 | °C |
| Item | Symbol | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage for Logic | VDD | － | 2.4 | 2.5 | 2.6 | V |
| Power Supply for I/O pins | VDDIO | － | 1.65 | 3.0 | VCI | V |
| Low voltage power supply | VCI | － | 2.4 | 3.0 | 3.5 | V |
| Supply Voltage for Display | VCC | － | 11.5 | 14.5 | 15 | V |
| High Level Input | VIH | － | 0.8×VDDIO | － | VDDIO | V |
| Low Level Input | VIL | － | 0 | － | 0.2×VDDIO | V |
| High Level Output | VOH | － | 0.9×VDDIO | － | VDDIO | V |
| Low Level Output | VOL | － | 0 | － | 0.1×VDDIO | V |
| 50% Check Board operating Current | ICC | VCC =12V | － | 24 | 32 | mA |
| VCC =14.5V | － | 32 | 42.5 | mA |
| Pin Number | Symbol | I/O | Function | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | N.C. (GND) | P | Ground | ||||||||||
| 2 | VSS | P | Ground. | ||||||||||
| 3 | VCC | P | Power supply for panel driving voltage. This is also the most positive power voltage supply pin. |
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| 4 | VCOMH | P | COM signal deselected voltage level. A capacitor should be connected between this pin and VSS. |
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| 5 | VLSS | P | Analog system ground pin. | ||||||||||
| 6~13 | D7~D0 | I/O | Host Data Input/Output Bus These pins are 8-bit bi-directional data bus to be connected to the microprocessor’s data bus. When serial mode is selected, D1 will be the serial data input SDIN and D0 will be the serial clock input SCLK. |
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| 14 | E/RD# | I | Read/Write Enable or Read This pin is MCU interface input. When interfacing to a 68XX-series microprocessor, this pin will be used as the Enable (E) signal. Read/write operation is initiated when this pin is pulled high and the CS# is pulled low. When connecting to an 80XX-microprocessor, this pin receives the Read (RD#) signal. Data read operation is initiated when this pin is pulled low and CS# is pulled low. When serial mode is selected, this pin must be connected to VSS. |
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| 15 | R/W# | I | Read/Write Select or Write This pin is MCU interface input. When interfacing to a 68XX-series microprocessor, this pin will be used as Read/Write (R/W#) selection input. Pull this pin to “High” for read mode and pull it to “Low” for write mode. When 80XX interface mode is selected, this pin will be the Write (WR#) input. Data write operation is initiated when this pin is pulled low and the CS# is pulled low. When serial mode is selected, this pin must be connected to VSS. |
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| 16 | BS0 | I | Communicating Protocol Select These pins are MCU interface selection input. See the following table:
(1) 0 is connected to VSS (2) 1 is connected to VDDIO |
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| 17 | BS1 | ||||||||||||
| 18 | D/C# | I | Data/Command Control This pin is Data/Command control pin connecting to the MCU. When the pin is pulled HIGH, the content at D[7:0] will be interpreted as data. When the pin is pulled LOW, the content at D[7:0] will be interpreted as command. |
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| 19 | CS# | I | Data/Command Control This pin is the chip select input connecting to the MCU. The chip is enabled for MCU communication only when CS# is pulled LOW. |
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| 20 | RES# | I | This pin is reset signal input. When the pin is pulled LOW, initialization of the chip is executed. Keep this pin pull HIGH during normal operation. |
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| 21 | FR | O | This pin is No Connection pins. Nothing should be connected to this pin. This pin should be left open individually. | ||||||||||
| 22 | IREF | I | Current Reference for Brightness Adjustment This pin is segment current reference pin. A resistor should be connected between this pin and VSS. Set the current lower than 10uA. |
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| 23 | N.C. | - | Reserved Pin The N.C. pin between function pins are reserved for compatible and flexible design. |
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| 24 | VDDIO | P | Power Supply for I/O Pin It should be matched with the MCU interface voltage level. |
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| 25 | VDD | P | Power Supply for Core Logic Circuit Power supply pin for core logic operation. A capacitor is required to connect between this pin and VSS |
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| 26 | VCI | P | Power Supply for Operation VCI must always be equal to or higher than VDD and VDDIO. |
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| 27 | VSL | P | Voltage Output Low Level for SEG Signal This is segment voltage reference pin. When external VSL is not used, this pin should be left open. When external VSL is used, this pin should connect with resistor and diode to ground. |
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| 28 | VLSS | P | Ground of Analog Circuit These are the analog ground pins. They should be connected to VSS externally. |
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| 29 | VCC | P | Power Supply for OLED Panel These are the most positive voltage supply pin of the chip. They must be connected to external source. |
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| 30 | N.C. (GND) | P | Ground |
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