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Qwiic Mux - PCA9548A

SKU: SPX-14293

$30.30 AUD, inc GST
$27.55 AUD, exc GST

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Qwiic Mux - PCA9548A
30.3008 AUD

SKU: SPX-14293

$30.30 AUD, inc GST
$27.55 AUD, exc GST
0 units ship today
Contact us if you need this product urgently


  • $6.95 Standard (2-4 days, tracked)
  • $8.95 Express (Overnight*, tracked)
  • $3 Economy Post* (3-7 days, no tracking)
  • FREE Pickup (Newcastle only)

Shipping costs may increase for heavy products or large orders.

Exact shipping can be calculated on the view cart page.

*Conditions apply, see shipping tab below.

The Qwiic Mux - PCA9548A enables communication with multiple I2C devices that have the same address and between different bus voltages (2.8V, 3.3V, and 5V). The PCA9548A is a very easy to use I2C multiplexer enabling up to 8 buses. This means you can communicate with 8 of the same device or mix and match between 5V, 3.3V and 2.8V devices. The PCA9548A can be daisy chained as well, so, if needed, you can use up to eight of the shields at the same time enabling a whopping 64 buses.

Some I2C devices have a selectable address, but many have only one. The Qwiic Mux allows control of multiple haptic drivers, multiple accelerometers, or finger sensors with ease.

We took all the good things from the Arduino Mux Shield and added a scoop of features on top. The Qwiic Mux includes two regulators so the master can operate and power the board at 5V or 3.3V and a regulated 3.3V and 2.8V will be generated for the appropriate buses. A jumper on the rear of the board controls the main bus voltage. Three power LEDs indicate which power rails are active. All 8 buses now have ample decoupling and are broken out to both Qwiic connectors and 0.1" footprints.

How do I use the Qwiic Mux? Connect your platform of choice (Arduino, Photon, Raspberry Pi, etc) to the Main connector over I2C. Connect your device to either the 2.8V, 3.3V, or 5V bus. As you can see from the photo, Qwiic cables make this easy but you can solder male headers or wires to each port as well.

How do I control the PCA9548A? It’s surprisingly easy. Over I2C, you tell the device which port you want to talk to, for example port 3. After that, whatever I2C traffic happens gets sent to port 3. By switching back and forth between ports, it’s easy to talk to multiple devices that have the same address!

What is the difference between the PCA9548A and TCA9548A? Very little. PCA is made by NXP, TCA is made by TI. PCA can operate from 2.3 to 5.5V, TCA can operate from 1.65 to 5.5V. Everything else is identical.

Issues with this version: SparkX moves fast and we’d rather get something into the wild then let it languish in the lab. The top silkscreen is correct but the rear silkscreen incorrectly identifies ports 0, 1, and 2 as 5V. Ports 0 and 1 are 3.3V, Port 2 is 2.8V.

The Qwiic system enables fast and solderless connection between popular platforms and various sensors and actuators. You can read more about the Qwiic system here. We carry 200mm, 100mm, 50mm, and breadboard friendly Qwiic cables.

We do not plan to regularly produce SparkX products so get them while they’re hot!

Experimental Product: SparkX products are rapidly produced to bring you the most cutting edge technology as it becomes available. These products are tested but come with no guarantees. Live technical support is not available for SparkX products. Head on over to our forum for support or to ask a question.


  • Works with popular platforms including Arduino, Photon, Raspberry Pi, Tessel 2, ESP32/ESP8266, and Edison
  • 9 ports with Qwiic connectors and 0.1" footprints
  • Four 3.3V buses, two 2.8V buses, two 5V buses
  • On board 3.3V (600mA) and 2.8V (150mA) regulation
  • Bus power indicator LEDs
  • Pull-up resistors and decoupling caps provided on all buses
  • Address jumpers to enable up to eight shields operating at the same time


Documentation and Resources:

Product Comments

Exact shipping can be calculated on the view cart page (no login required).

We deliver Australia-wide with these options:

  • $3 for Small Items (3-7 days, not tracked, only available on selected small items)
  • $6.95 for Standard Post (2-4 days, tracked)
  • $8.95 for Express Post (Overnight for Australia Post Next Day Network, tracked)
  • Pickup - Free! Only available to customers who live in the Newcastle region (only after we email you to notify your order is ready)

International Orders - the following rates are for New Zealand and will vary for other countries:

  • $11.49 for Pack and Track (3+ days, tracked)
  • $16.50 for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount might increment based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
NSW, 2289

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

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