TCA9548A I2C 1-to-8 Channel Multiplexer Module

1 to 8 bidirectional translating switches
Active-low reset input
Three address pins—up to 8 TCA9548A devices on the same I2C bus
Channel selection through an I2C bus
Operating power supply voltage range: 1.65V to 5.5V
5V tolerant pins

SKU: 26473

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Description

TCA9548A I2C 1-to-8 Channel Multiplexer Module

The TCA9548A I2C multiplexer allows you to communicate with up to 8 I2C devices with the same I2C bus. The multiplexer communicates with a microcontroller using the I2C communication protocol. Then, you can select which I2C bus on the multiplexer you want to address.

To address a specific port, you just need to send a single byte to the multiplexer with the desired output port number.

Features:

1 to 8 bidirectional translating switches
Active-low reset input
Three address pins—up to 8 TCA9548A devices on the same I2C bus
Channel selection through an I2C bus
Operating power supply voltage range: 1.65V to 5.5V
5V tolerant pins

TCA9548A Pinout

Pin	Description
VIN	Powers the multiplexer
GND	Connect to GND
SDA	Connect to the master microcontroller SDA pin
SCL	Connect to the master microcontroller SCL pin
RST	Active low RST pin—can be used to reset the multiplexer
A0	Selects multiplexer I2C address—connect to GND or VCC
A1	Selects multiplexer I2C address—connect to GND or VCC
A2	Selects multiplexer I2C address—connect to GND or VCC
SD0	SDA for channel 0
SC0	SCL for channel 0
SD1	SDA for channel 1
SC1	SCL for channel 1
SD2	SDA for channel 2
SC2	SCL for channel 2
SD3	SDA for channel 3
SC3	SCL for channel 3
SD4	SDA for channel 4
SC4	SCL for channel 4
SD5	SDA for channel 5
SC5	SCL for channel 5
SD6	SDA for channel 6
SC6	SCL for channel 6
SD7	SDA for channel 7
SC7	SCL for channel 7

TCA9548A Multiplexer I2C Address:

The TCA9548A Multiplexer communicates with a microcontroller using the I2C communication protocol. So, it needs an I2C address. The address of the multiplexer is configurable. You can select a value from 0x70 to 0x77 by adjusting the values of the A0, A1, and A2 pins, as shown in the table below.