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PCA9548A I2C 8-Channel Multiplexer Breakout Expansion Board

₦ 2,500

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Description

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.

A0 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

Tutorial: https://randomnerdtutorials.com/tca9548a-i2c-multiplexer-esp32-esp8266-arduino/

Datasheet: https://cdn-shop.adafruit.com/datasheets/tca9548a.pdf

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