TCA9548A 8-channel I2C multiplexer breakout with STEMMA QT / Qwiic connectors, allowing up to 8 devices sharing the same I2C address to be addressed independently. The TCA9548A itself has 8 configurable addresses, enabling up to 64 I2C buses on one host.
main I2C/Qwiic bus supply for the TCA9548A mux breakout; SparkFun says the breakout operates from 1.65V to 5.5V
common ground for main bus, Qwiic connectors, and header
main upstream I2C serial-data line into the mux; product page describes one main I2C port controlling eight channels
main upstream I2C serial-clock line into the mux; product page describes routing future I2C communication to the selected channel
TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses
TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses
TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses
TCA9548A reset input exposed on the breakout schematic
multiplexed downstream I2C data line for channel 0; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C clock line for channel 0; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C data line for channel 1; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C clock line for channel 1; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C data line for channel 2; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C clock line for channel 2; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C data line for channel 3; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C clock line for channel 3; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C data line for channel 4; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C clock line for channel 4; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C data line for channel 5; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C clock line for channel 5; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C data line for channel 6; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C clock line for channel 6; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C data line for channel 7; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
multiplexed downstream I2C clock line for channel 7; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VCC | power | main I2C/Qwiic bus supply for the TCA9548A mux breakout; SparkFun says the breakout operates from 1.65V to 5.5V | 1.65V to 5.5V | |
| GND | ground | common ground for main bus, Qwiic connectors, and header | 0V | |
| SDA | i2c data | main upstream I2C serial-data line into the mux; product page describes one main I2C port controlling eight channels | logic level follows VCC, 1.65V to 5.5V operating range | |
| SCL | i2c clock | main upstream I2C serial-clock line into the mux; product page describes routing future I2C communication to the selected channel |
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| logic level follows VCC, 1.65V to 5.5V operating range |
| A0 | address select | TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses | logic level follows VCC |
| A1 | address select | TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses | logic level follows VCC |
| A2 | address select | TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses | logic level follows VCC |
| RST | digital input | TCA9548A reset input exposed on the breakout schematic | logic level follows VCC |
| SD0 | channel-0-data | i2c data | multiplexed downstream I2C data line for channel 0; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SC0 | channel-0-clock | i2c clock | multiplexed downstream I2C clock line for channel 0; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SD1 | channel-1-data | i2c data | multiplexed downstream I2C data line for channel 1; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SC1 | channel-1-clock | i2c clock | multiplexed downstream I2C clock line for channel 1; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SD2 | channel-2-data | i2c data | multiplexed downstream I2C data line for channel 2; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SC2 | channel-2-clock | i2c clock | multiplexed downstream I2C clock line for channel 2; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SD3 | channel-3-data | i2c data | multiplexed downstream I2C data line for channel 3; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SC3 | channel-3-clock | i2c clock | multiplexed downstream I2C clock line for channel 3; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SD4 | channel-4-data | i2c data | multiplexed downstream I2C data line for channel 4; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SC4 | channel-4-clock | i2c clock | multiplexed downstream I2C clock line for channel 4; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SD5 | channel-5-data | i2c data | multiplexed downstream I2C data line for channel 5; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SC5 | channel-5-clock | i2c clock | multiplexed downstream I2C clock line for channel 5; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SD6 | channel-6-data | i2c data | multiplexed downstream I2C data line for channel 6; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SC6 | channel-6-clock | i2c clock | multiplexed downstream I2C clock line for channel 6; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SD7 | channel-7-data | i2c data | multiplexed downstream I2C data line for channel 7; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |
| SC7 | channel-7-clock | i2c clock | multiplexed downstream I2C clock line for channel 7; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels | logic level follows VCC |