Multiplexer module, I2C, 8 channels, TCA9548, 3.3-5V

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Multiplexer module, I2C, 8 channels, TCA9548, 3.3-5V

RON7.32

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Multiplexer module, compatible with Arduino and other development boards, which allows connecting up to 8 devices to the same I2C address. This happens when you have several sensors using the same I2C address, making it impossible to use them at the same time.

The multiplexer itself is at I2C address 0x70 (settable between 0x70 and 0x77) and works by addressing a single byte to the multiplexer in which the desired channel is specified. The multiplexer will communicate with the microcontroller via I2C and the microcontroller selects which port on the multiplexer will be used. Theoretically, up to 8 multiplexer modules can be used, each with its own address between 0x70 and 0x77, each connected with 8 sensors, for a total of 64 I2C sensors on the same microcontroller.

This module is compatible with 3.3V and 5V logic voltages, without the need to use a logic level translator.

Use:

Setting the address used is done by setting pins A0, A1 and A2 as follows:

aA	A1	A2	I2C ADDRESS
LOW	LOW	LOW	0X70
HIGH	LOW	LOW	0X71
LOW	HIGH	LOW	0X72
HIGH	HIGH	LOW	0X73
LOW	LOW	HIGH	0X74
HIGH	LOW	HIGH	0X75
LOW	HIGH	HIGH	0X76
HIGH	HIGH	HIGH	0X77

Setting to LOW is done by connecting the respective pin to GND, setting to HIGH by connecting to the module's supply voltage (VCC).

To select an I2C bus for writing/reading, it is necessary to send a byte to the multiplexer with the desired output port (in numeric format, from 0 to 7).

Example port selection with Arduino:

void TCA9548A(uint8_t bus){

Wire.beginTransmission(0x70); // TCA9548A address is 0x70

Wire.write(1 << bus); // send bytes to the selected bus

Wire.endTransmission();

Serial.print(bus);

}

Afterwards, it is sufficient to call the function and send as an argument the number of the port you want to control before sending the I2C commands. For example, to control the device connected to bus number 3, the following line will be called before other I2C commands. ports start from 0.

TCA9548A(2);

Pins:

Pine tree Description

WINE It powers the multiplexer

GND Connected to GND

SDA Connected to the SDA pin of the main microcontroller

SCL Connected to the SCL pin of the main microcontroller

RS RST pin in LOW — can be used to reset the multiplexer

A0 Selects the I2C address of the multiplexer—connected to GND or VCC

A1 Selects the I2C address of the multiplexer—connected to GND or VCC

A2 Selects the I2C address of the multiplexer—connected to GND or VCC

SD0 SDA for channel 0