NOTE:

1. This module supports IIC and 4-wire SPI interface bus mode switching (as shown in the red box in Picture 2). The details are as follows:

A. Using 4.7K resistance to solder only R5 resistors, then choose 4-wire SPI bus interface (default);

B. Using 4.7K resistance to solder only R4 and R9 resistors, then select the IIC bus interface;

2. After the interface bus mode is switched, you need to select the

corresponding software and the corresponding wiring pins (as shown in Picture 1) for the module to operate normally. The corresponding wiring pins are described as follows:

A. select the 4-wire SPI bus interface, all pins need to be used;

B. To select the IIC bus interface, only five pins GND,VCC, SCL, SDA and res need to be used. Connect the CS pin to the power supply and ground. The

DC pin can be used to select the IIC slave device address. Select 0x7a for high level and 0x78 for low level;

3. Solder R8 resistor (as shown in the green box in Picture2), then CS pin does not need to be connected

important:

1. The following pin numbers 1~7 refer to the module pin number of our company with PCB backplane. If you purchase a bare screen, please refer to the pin definition of the bare screen specification, refer to the wiring according to the signal type instead of directly according to the following. The module pin number is used for wiring. For example: CS is 7 feet on our module. It may be x pin on different size bare screen. The following wiring instructions tell you that the CS signal is connected to the A5 pin of theMCU.

2. About VCC supply voltage: The OLED display module can be connected to

3.3V or 5V.

Hardware Configuration

The hardware circuit of the module is composed of four parts: OLED display control circuit, OLED boost circuit, pin array interface, and power supply voltage stabilizing circuit.

OLED display control circuit is mainly used to control OLED display, including chipselection, reset, data and command transmission control, and interface selection.

The OLED boosting circuit is used to boost an input voltage to an OLED light emitting voltage.

The pin array interface is used for external connection of the main control development board.

The power supply voltage stabilizing circuit is used for 3.3V voltage stabilizing power supply.The OLED module adopts 4-wire SPI communication mode by default. In addition, it can also select IIC communication mode. The hardware is configured with 7 pins. Different communication methods are used, and the selected pins are different (see the interface description for details).