20x2 OLED, 20x2 COG OLED Display Module with SSD1311 Controller, 2.93 inch - WEO002002A

20x2 COG OLED Display Module with SSD1311 Controller, 2.93"

Model No. WEO002002A

►Type : Character
►Structure : COG
►20 characters x 2 Lines
►IC：SSD1311
►3V/5V Power supply
►1/16 duty
►Interface: 6800, 8080, SPI, I2C
►Display Color: White / Yellow
►Other FPC options available in below table

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Description

The 20x2 COG Character OLED Display Module (Model: WEO002002A) features a COG (Chip On Glass) design, providing a high-performance and reliable display solution. This OLED module is known for its clear display and robustness, making it suitable for a variety of applications.

The module dimensions are 84.5 x 19.28 mm with a thickness of 2.17 mm, and the active area is 73.52 x 11.52 mm, with a diagonal size of 2.93 inches. Equipped with an SSD1311 driver IC, the WEO002002A supports an integrated character set, including ASCII, English, European, and Japanese characters. Each character is composed of 5x8 pixels, ensuring detailed and clear text representation.

This module has a display mode of 2 lines, with each line capable of showing 20 characters. Due to the self-emissive nature of OLED technology, the module does not require a backlight, resulting in a lighter and thinner design and an enhanced contrast ratio of 10,000:1. Additionally, it features an ultra-wide viewing angle of up to 175 degrees, ensuring consistent display quality from various angles. The module also offers low power consumption and a broad operating temperature range, demonstrating its versatility.

The operating temperature range of the WEO002002A is -40°C to +80°C, with a storage temperature range of -40°C to +85°C, allowing stable performance in extreme conditions. The module operates within a logic voltage range of 2.4V to 3.3V, with a typical value of 3V, and utilizes a 1/16 duty driving method.

Furthermore, the WEO002002A supports multiple interface options, including 6800/8080 8-bit parallel and I2C/SPI serial interfaces, offering flexible connectivity to meet various system requirements. The module series also provides various Flexible Printed Circuit (FPC) options to address diverse customer needs.

With its reliable display quality, wide operating temperature range, and flexible interface options, the WEO002002A OLED Display Module is an excellent alternative to traditional LCD modules. We recommend considering this 20x2 character OLED module to enhance your product's display performance, achieving better display quality and lower power consumption.

FPC Options

DRAWING

Data source ref: WEO002002AWPP5N00000

SPECIFICATIONS

Interface Pin Function

Pin No.

Symbol

Pin Type

Description

－

No connection

VSL

This is segment voltage (output low level) reference pin.
When external VSL is not used, this pin should be left open.
When external VSL is used, connect with resistor and diode to ground (details depend on application).

VSS

Ground pin. It must be connected to external ground.

REGVDD

Internal VDD regulator selection pin in 5V I/O application mode.
When this pin is pulled HIGH, internal VDD regulator is enabled (5V I/O application).
When this pin is pulled LOW, internal VDD regulator is disabled (Low voltage I/O application).

SHLC

This pin is used to determine the Common output scanning direction.
COM scan direction

SHLC	COM scan direction
1	COM0 to COM31 (Normal)
0	COM3 1 to COM0 (Reverse)

Note
(1) 0 is connected to VSS
(2) 1 is connected to VDDIO

SHLS

This pin is used to change the mapping between the display data column address and the Segment driver.
SEG scan direction

SHLS	SEG direction
1	SEG0 to SEG99 (Normal)
0	SEG99 to SEG0 (Reverse)

Note
(1) 0 is connected to VSS
(2) 1 is connected to VDDIO

VDD

Power supply for core logic operation.
VDD can be supplied externally or regulated internally.
In LV IO application (internal VDD is disabled), this is a power input pin.
In 5V IO application (internal VDD is enabled), VDD is regulated internally from VDDIO.
A capacitor should be connected between VDD and VSS under all circumstances.

VDDIO

Low voltage power supply and power supply for interface logic level in both Low Voltage I/O and 5V I/O application. It should match with the MCU interface voltage level and must be connected to external source.

BS0

MCU bus interface selection pins. Select appropriate logic setting as described in the following table. BS2, BS1 and BS0 are pin select.
Bus Interface selection

BS[2:0]	Interface
000	Serial Interface
001	Invalid
010	I2C
011	Invalid
100	8-bit 6800 parallel
101	4-bit 6800 parallel
110	8-bit 8080 parallel
111	4-bit 8080 parallel

Note
(1) 0 is connected to VSS
(2) 1 is connected to VDDIO

BS1

BS2

GPIO

I/O

It is a GPIO pin. Details refer to OLED command DCh.

CS#

This pin is the chip select input connecting to the MCU.
The chip is enabled for MCU communication only when CS# is pulled LOW (active LOW).
In I2C mode, this pin must be connected to VSS.

RES#

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.

D/C#

This pin is Data/Command control pin connecting to the MCU.
When the pin is pulled HIGH, the data at D[7:0] will be interpreted as data.
When the pin is pulled LOW, the data at D[7:0] will be transferred to a command register.
In I2C mode, this pin acts as SA0 for slave address selection.
When serial interface is selected, this pin must be connected to VSS.

R/W#(WR#)

This pin is read / write control input pin connecting to the MCU interface.
When 6800 interface mode is selected, this pin will be used as Read/Write (R/W#) selection input. Read mode will be carried out when this pin is pulled HIGH and write mode when LOW.
When 8080 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 chip is selected.
When serial or I2C interface is selected, this pin must be connected to VSS.

E(RD#)

This pin is MCU interface input.
When 6800 interface mode is selected, this pin will be used as the Enable (E) signal.
Read/write operation is initiated when this pin is pulled HIGH and the chip is selected.
When 8080 interface mode is selected, this pin receives the Read (RD#) signal. Read operation is initiated when this pin is pulled LOW and the chip is selected.
When serial or I2C interface is selected, this pin must be connected to VSS.

I/O

These pins are bi-directional data bus connecting to the MCU data bus.
Unused pins are recommended to tie LOW.
When serial interface mode is selected, D0 will be the serial clock input: SCLK; D1 will be the serial data input: SID and D2 will be the serial data output: SOD.
When I2C mode is selected, D2, D1 should be tied together and serve as SDAout, SDAin in application and D0 is the serial clock input, SCL.

IREF

This pin is the segment output current reference pin.
IREF is supplied externally.
A resistor should be connected between this pin and VSS to maintain current of around 15uA.

ROM0

These pins are used to select Character ROM; select appropriate logic setting as described in the following table. ROM1 and ROM0 are pin select as shown in below table:
Character ROM selection

ROM1	ROM0	ROM
0	0	A
0	1	B
1	0	C
1	1	S/W selectable(3)

Note
(1) 0 is connected to VSS
(2) 1 is connected to VDDIO

ROM1

OPR0

This pin is used to select the character number of character generator.
Character RAM selection

OPR1	OPR0	CGROM	CGRAM
1	1	256	0
0	1	248	8
1	0	250	6
0	0	240	8

Note
(1) 0 is connected to VSS
(2) 1 is connected to VDDIO

OPR1

VCOMH

COM signal deselected voltage level.
A capacitor should be connected between this pin and VSS.
No external power supply is allowed to connect to this pin.

VCC

Power supply for panel driving voltage. This is also the most positive power voltage supply pin. It is supplied by external high voltage source.

－

No connection

Mechanical Data

Item	Dimension	Unit
Number of Characters	20 Characters x 2 Lines	－
Module dimension	84.5 x 19.28 x 2.17	mm
View area	75.52 x 13.52	mm
Active area	73.52 x 11.52	mm
Dot size	0.62 x 0.67	mm
Dot pitch	0.65 x 0.70	mm
Character size	3.22 x 5.57	mm
Character pitch	3.70 x 5.95	mm
LCD type	OLED , Monochrome
Duty	1/16
IC	SSD1311
Interface	6800, 8080, SPI, I2C
Size	2.93 inch

Absolute Maximum Ratings

Item	Symbol	Min	Max	Unit
Supply Voltage For Logic	VDD	-0.3	VDDIO	V
Power Supply for I/O pins	VDDIO	-0.3	6	V
Operating Voltage	VCC	0	16	V
Operating Temperature	TOP	-40	+80	℃
Storage Temperature	TST	-40	+85	℃

Electronical Characteristics

Item	Symbol	Condition	Min	Typ	Max	Unit
Supply Voltage For Logic	VDD	Low Voltage I/O	2.4	3.0	3.3	V
Supply Voltage For Logic	VDD	5V I/O (VDD as output)	－	－	－	V
Power supply for I/O pins	VDDIO	Low Voltage I/O	2.4	3.0	3.3	V
Power supply for I/O pins	VDDIO	5V I/O	4.4	5.0	5.3	V
Operating Voltage	VCC	－	8.0	10.0	10.5	V
Operating Voltage	VCC	－	8.0	12.0	12.5	V
Input High Volt.	VIH	－	0.8xVDDIO	－	－	V
Input Low Volt.	VIL	－	－	－	0.2xVDDIO	V
Output High Volt.	VOH	IOH=-0.5mA	0.9xVDDIO	－	－	V
Output Low Volt.	VOL	IOL=0.5mA	－	－	0.1xVDDIO	V
50% Check Board Operating Current	ICC	VCC=10V	－	18	27	mA
50% Check Board Operating Current	ICC	VCC=12V	－	25	38	mA