Adafruit
TCA9548A I2C Multiplexer
The TCA9548A 1-to-8 I2C multiplexer solves the common problem of needing multiple I2C devices with the same address on a single bus. It acts as a gatekeeper,...
The TCA9548A 1-to-8 I2C multiplexer solves the common problem of needing multiple I2C devices with the same address on a single bus. It acts as a gatekeeper, routing I2C traffic to any of its eight downstream channels on command.
Simply write a single byte to the multiplexer's I2C address (default 0x70, configurable 0x70–0x77) to select which channel receives subsequent I2C communication. With up to 8 multiplexers on a single bus, you can theoretically address 64 identical I2C devices.
Key Features
- 8 I2C Channels – Connect up to 8 same-address devices to one bus
- Configurable Address – Set from 0x70 to 0x77 for up to 8 multiplexers per bus
- 3.3V and 5V Compatible – Works with any logic level
- Breadboard Friendly – Breakout board with capacitors and pull-ups included
- Simple Control – Single byte write to select the active channel
Specifications
- IC: TCA9548A
- I2C Channels: 8
- Default Address: 0x70 (configurable 0x70–0x77)
- Logic Level: 3.3V and 5V compatible
Ideal For
- Using multiple identical I2C sensors on one bus
- Expanding I2C address space
- Multi-sensor Arduino and Raspberry Pi projects
- Isolating I2C bus segments
Package Contents
- 1× TCA9548A I2C Multiplexer Breakout Board
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- I2C address
- An I2C address is the number a device uses so a microcontroller can tell it apart from other devices on the same I2C bus. It matters because two devices with the same fixed address may conflict if used together.
- multiplexer
- A multiplexer is a chip or board that lets one controller switch between several devices that would otherwise conflict on the same bus. It matters here because multiple modules with the same I2C address cannot normally share one I2C bus without extra hardware.
- UPS
- An uninterruptible power supply is a battery-backed power system that keeps a device running when external power is unplugged or fails. For an embedded computer, it helps prevent sudden shutdowns that can corrupt files or interrupt a project.
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