Qwiic Mux PCA9846

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Do you have too many sensors with the same I2C address? Connect them to the SparkX PCA9846 Qwiic Mux to get them all talking on the same bus! This Qwiic Mux enables communication with multiple I2C devices that have the same address. This Qwiic Mux also has eight configurable addresses of its own, allowing for up to 32 I2C buses on a single connection. To make it even easier to use this multiplexer, all communication is enacted exclusively via I2C, utilizing our handy Qwiic system.

The PCA9846 Qwiic Mux is very similar to our classic 8-channel Qwiic Mux, except:

  • It has four multiplexed Qwiic ports, plus Qwiic Main In and Out connections, on a super-cute 1" x 1" PCB
  • The PCA9846 has a "Who Am I" (Device ID) product identification register which makes it much easier to detect in auto-detect DataLogger / OpenLog applications.

We've written a dedicated Arduino Library for the PCA9846 to get you up and running as qwiicly as possible!

The SparkFun Qwiic Connect System is an ecosystem of I2C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you can’t hook it up wrong.

  • 1" x 1" PCB with standoff mounting holes
  • Main In and Out Qwiic connections
  • Four multiplexed Qwiic ports (0-3)
  • Configurable I2C address:
  • Supports both 100kHz and 400kHz clock speeds
  • 0.1"-spaced breakout holes for Power, I2C and Reset
  • Power LED (configurable)
  • Full set of 2.2K pull-up resistors (configurable)
  • "Who Am I" (Device ID) identification
  • Supply voltage:
    • 1.65V (Min)
    • 3.3V (Max)
    • Note: Qwiic operates at 3.3V only


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • Member #1884430 / about 3 months ago / 1

    What is the temperature rating of the components and PCB?

    • PaulZC / about 3 months ago / 1

      Hi. Thank you for the interest in our product. The temperature rating of the mux chip is -40C to +85C. The same is true for the LED. The passives and PCB will match or exceed that. Best wishes, Paul

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