TCA9548A Development Board CJMCU-9548 CJMCU TCA9548A I2C 8 Channel Multiple Extensions Development Board – Enhanced and Convenient

TCA9548A Development Board-

The CJMCU TCA9548A is a multiplexer/demultiplexer module that allows you to control multiple I2C devices using a single I2C bus. It provides a convenient way to expand the number of I2C devices that can be connected to a microcontroller or other I2C master device.

The TCA9548A 1-to-8 I2C 8 multi-channel expansion board enables communication with multiple I2C devices that have the same address making it simple to interface with. Using this you can get up to 8 same-address I2C devices hooked up to one microcontroller – this multiplexer acts as a gatekeeper, shuttling the commands to the selected set of I2C pins with your command.

The CJMCU TCA9548A I2C 8 Channel Multiple extensions development board is interesting in that it has an I2C address (0x70 by default) – and you basically send it a command to tell it which I2C multiplexed output you want to talk to, then you can address the board you want to address.

Specifications

• Interface: I2C IIC
• Chip: TCA9548A
• Selectable I2C address: 0x70-0x77
• Working Voltage: 1.65-5.5V
• Max Clock Frequency: 400KHz

Features

Efficient I2C Channel Multiplexing-

The CJMCU TCA9548A is a versatile multiplexer module designed to optimize your I2C bus. With the ability to independently enable or disable eight channels, it allows for efficient communication with multiple I2C devices. Perfect for complex sensor arrays and multi-device systems.

Precise Device Control-

This module empowers you with fine-grained control over your I2C devices. By enabling only the necessary channels, you can prevent bus contention and address conflicts, ensuring smooth and reliable communication. Say goodbye to I2C bottlenecks and enhance the performance of your projects.

Seamless Integration-

The CJMCU TCA9548A is designed for easy integration into your existing setups. Its compact form factor and clearly labelled pins simplify the installation process. Whether you’re a seasoned electronics enthusiast or just starting out, you’ll appreciate the simplicity and efficiency it brings to your projects.

Pin Description

Power Pins:

• Vin – this is the power pin. Since the sensor chip uses 3-5 VDC. To power, the board, give it the same power as the logic level of your microcontroller – e.g. for a 5V micro like Arduino, use 5V.
• GND – common ground for power and logic.

I2C Control-Side pins:

• SCL – this is the I2C clock pin for the chip itself, connected to your microcontroller’s I2C clock line.
• SDA – this is the I2C data pin for the chip itself, connected to your microcontroller’s I2C data line.
• RST – this is the reset pin, for resetting the multiplexer chip. Pulled high by default, connect to ground to reset
• A0 A1 A2 – these are the address selection pins for the multiplexer. By default, the multiplexer is at address 0x70 and these three pins are pulled low. Connect them to Vin to set the address to 0x71 – 0x77.
• A0 is the lowest-significant bit (if it is pulled high, it will increase the address by 1).
• A1 is the 2nd-lowest-significant bit (if it is pulled high, it will increase the address by 2).
• A2 is the 3rd-lowest-significant bit (if it is pulled high, it will increase the address by 4).

I2C Multiplexed-Side pins:

• SDx and SCx:  There are 8 sets of SDx and SCx pins, from SD0/SC0 to SD7/SC7. These are the multiplexed pins. Each one is a completely separate I2C bus set. So you have 8 I2C devices with identical addresses, as long as they are on one I2C bus each.
• These pins do not have any pull-ups installed, so if you are using a chip or breakout without I2C pull-ups be sure to add them! Nicely, you can have Vin be 3.3V and have these pins pulled up to 5V (that is, they are 5V compliant).

Useful Link

TCA9548A I2C Multiplexer Module – With Arduino and NodeMCU

Package Included

• 1 x CJMCU TCA9548A I2C Development Board
• 2 x Header set ( Without Soldered)