1.5 inch 128×128 COG Graphic OLED Display

Model No. WEO128128H

Type: Graphic
Structure: COG
Size:1.5 inch
128 x 128 Dot Matrix
IC：CH1120
3V Power supply
1/128 Duty
Interface: 8080,SPI,I2C
Display Color: White / Yellow
Support Grayscale

Categories: Graphic OLED Display, OLED Module

Description

WEO128128H is a 1.5-inch COG Graphic OLED display featuring 4-bits grayscale function; made of resolution of 128×128 pixels. This module is built-in with CH1120 IC; it supports 8080, SPI, I2C interface, 1/128 driving duty, the supply voltage for Logic is 3V (VDD), and the supply voltage for display is 12V. The current with 50% checkerboard display is 20mA @ VCC 12V for white and 14.5V for yellow.

WEO128128H is a COG structure OLED display module that is lightweight, low power, and very thin. It is suitable for smart home applications, Cloud/IoT systems, handheld instruments, intelligent technology devices, energy systems, automotive, communication systems, medical instruments, etc. WEO128128H OLED module can be operated at temperatures from -40℃ to +80℃; its storage temperatures range from -40℃ to +85℃.

Drawing

1.5 inch OLED, 128x128 SPI OLED Display - WEO128128H

Data source ref:WEO128128HLAP3N00000

SPECIFICATIONS

Interface Pin Function

No.

Symbol

Function

ESD_GND

This pin should be connected to GND.

VPP

This is the most positive voltage supply pin of the chip.
It should be supplied externally.

VCOMH

This is a pin for the voltage output high level for common signals.
A capacitor should be connected between this pin and GND.

VDD

Power supply for logic

No connection

IM1

These are the MPU interface mode select pins.

	8080	3-wire SPI	4-wire SPI	I2C
IM1	1	0	0	1
IM2	1	1	0	0

These pins must be connected to “H” or “L”.

IM2

VSS

Ground for logic and analog. This pin should be connected to GND externally.

IREF

This is a segment current reference pin.
A resistor should be connected between this pin and GND.

CSB

This pin is the chip select input. When CSB = “L”, then the chip select becomes active, and data/command I/O is enabled.
When in I2C interface, this pin is not used, so it must be connected to “L”.

RESB

This is a reset signal input pin. When RESB is set to “L”, the settings are initialized. The reset operation is performed by the RESB signal level. This pin internal pull high.

This is the Data/Command control pin that determines whether the data bits are data or a command.
A0 = “H”: the inputs at D0 to D7 are treated as display data
A0 = “L”: the inputs at D0 to D7 are transferred to the command registers.
In I2C interface, this pin serves as SA0 to distinguish the different address of OLED driver.
When in 3-wire interface, this pin is not used, so it must be connected to “L”.

WRB

This is a MPU interface input pin.
When connected to an 8080 MPU, this is active LOW. This pin connects to the 8080 MPU WR signal. The signals on the data bus are latched at the rising edge of the WR signal
When in 3-wire.4-wire & I2C interface, this pin is not used, so it must be connected to “L”.

RDB

This is a MPU interface input pin.
When connected to an 8080 series MPU, it is active LOW. This pin is connected to the RD signal of the 8080 series MPU, and the data bus is in an output status when this signal is “L”.
When in 3-wire.4-wire & I2C interface, this pin is not used, so it must be connected to “L”.

This is an 8-bit bi-directional data bus that connects to an 8-bit or 16-bit standard MPU data bus.
When the serial interface(SPI) and I2C is selected, then D0 serves as the serial clock input pin (SCL) and D1 serves as the serial data input pin (SI). At this time, D2 to D7 are set to high impedance. D7~D2 is recommended to connect the VDD or GND. It is also allowed to leave D7~D2 unconnected.

VPP

This is the most positive voltage supply pin of the chip
It should be supplied externally.

ESD_GND

This pin should be connected to GND.

Mechanical Data

Item	Dimension	Unit
Dot Matrix	128 × 128	dots
Module dimension	33.80 x 36.50 x 2.01	mm
Active Area	26.86 x 26.86	mm
Pixel Size	0.185 x 0.185	mm
Pixel Pitch	0.210 x 0.210	mm
Display Mode	Passive Matrix
Display Color	Monochrome
Drive Duty	1/128 Duty
Gray Scale	4 bits
IC	CH1120
Interface	8080,SPI,I2C
Size	1.5 inch

Absolute Maximum Ratings

Parameter	Symbol	Min	Max	Unit
Supply Voltage for Logic	VDD	-0.3	3.5	V
Supply Voltage for Display	VPP	-0.3	15.0	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	－	1.65	3.0	3.3	V
Supply Voltage for Display	VPP	－	8.0	14.5	15.0	V
High Level Input	VIH	－	0.8×VDD	－	VDD	V
Low Level Input	VIL	－	GND	－	0.2×VDD	V
High Level Output	VOH	－	0.8×VDD	－	VDD	V
Low Level Output	VOL	－	GND	－	0.1×VDD	V
Display 50% Pixel on	IPP	VPP=14.5V	－	20	30	mA

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