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Tca9548A - Troubleshooting

This page contains some tips in case you are having problems using this product.

Check wiring​

Ensure that the TCA9548A breakout board is correctly wired to your microcontroller:

  • SDA/SCL pins on the microcontroller should connect to the SDA/SCL pins on the multiplexer.
  • Ensure that GND is connected between the microcontroller and the breakout board.
  • Verify that VCC is connected to a stable power source (3.3V or 5V).

Verify Address Configuration​

Check that the A0, A1, and A2 jumpers are configured correctly to set unique addresses for each multiplexer.

Try Running Examples​

If you're confident that your wiring and configuration are correct, try running our Arduino Example Code to test communication with sensors.

Open/Close Channels​

Ensure that you are opening and closing channels correctly in your code:

  • Use I2CMux.openChannel(channel) to enable communication with devices on a specific channel.
  • Use I2CMux.closeChannel(channel) or I2CMux.closeAll() to isolate devices on other channels.

Check Device Wiring​

Verify that devices connected to individual channels are properly wired:

  • SDAx/SCLx pins should connect to the corresponding pins on the device.
  • Ensure GND and VCC are connected properly.
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