3.12" 256x64 COF OLED Display
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
Description
The model WEX025664B is a 3.12-inch COF-structured OLED graphic display with a resolution of 256x64 dots. This 3.12" OLED display is equipped with an SSD1322 driver IC, supporting 8-bits 6800/8080, and 3-line/4-line SPI interfaces. It has an outline dimension of 88 x 27.8 mm, with an active area size of 76.778 x 19.178 mm. The display features 4-bits grayscale, and its logic voltage is 2.5V (typical value) with a duty cycle of 1/64. The module can operate at temperatures from -40°C to +80°C, and its storage temperature is from -40°C to +85°C.
The OLED module features a high contrast ratio of 10,000:1, allowing for more vibrant and true-to-life colors, deeper blacks, and brighter whites. This results in enhanced image quality, sharper details, and improved readability, particularly in low-light environments. Additionally, the high contrast ratio contributes to a more immersive viewing experience.
The OLED module is suitable for various applications such as wall/meter devices, home applications, POS systems, Cloud/IoT systems, handheld instruments, intelligent technology devices, energy systems, automotive applications, communication systems, and medical instruments. Customers can upgrade their current applications from traditional STN displays to OLED displays, as the module provides a very wide range of dot pixel formats for OLED solutions.
Additionally, OLED panels with the same dimensions offer a variety of alternatives:- WEX025664B-CTP series without a metal frame, PCB, and with a CTP touch screen.
- WEN025664B series with a metal frame and PCB.
- WEN025664B-CTP series with a metal frame, PCB, and CTP touch screen.
DRAWING
Data source ref: WEX025664BWPP3N00000
SPECIFICATIONS
Interface Pin Function
| 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 |
General Specification
| 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 | |
Absolute Maximum Ratings
| 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 |
Electronical Characteristics
| 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 |
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