STEMMA QT / Qwiic TCA9548A Mux Breakout - 8 Channel

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.

Logical pinout · physical placement not verified

VCC
main I2C/Qwiic bus supply for the TCA9548A mux breakout; SparkFun says the breakout operates from 1.65V to 5.5V
Type · PowerVoltage · 1.65V to 5.5V
GND
common ground for main bus, Qwiic connectors, and header
Type · GroundVoltage · 0V
SDA
main upstream I2C serial-data line into the mux; product page describes one main I2C port controlling eight channels
Type · I2CVoltage · logic level follows VCC, 1.65V to 5.5V operating range
SCL
main upstream I2C serial-clock line into the mux; product page describes routing future I2C communication to the selected channel
Type · I2CVoltage · logic level follows VCC, 1.65V to 5.5V operating range
A0
TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses
Type · AnalogVoltage · logic level follows VCC
A1
TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses
Type · AnalogVoltage · logic level follows VCC
A2
TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses
Type · AnalogVoltage · logic level follows VCC
RST
TCA9548A reset input exposed on the breakout schematic
Type · ControlVoltage · logic level follows VCC
SD0channel-0-data
multiplexed downstream I2C data line for channel 0; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SC0channel-0-clock
multiplexed downstream I2C clock line for channel 0; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SD1channel-1-data
multiplexed downstream I2C data line for channel 1; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SC1channel-1-clock
multiplexed downstream I2C clock line for channel 1; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SD2channel-2-data
multiplexed downstream I2C data line for channel 2; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SC2channel-2-clock
multiplexed downstream I2C clock line for channel 2; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SD3channel-3-data
multiplexed downstream I2C data line for channel 3; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SC3channel-3-clock
multiplexed downstream I2C clock line for channel 3; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SD4channel-4-data
multiplexed downstream I2C data line for channel 4; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SC4channel-4-clock
multiplexed downstream I2C clock line for channel 4; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SD5channel-5-data
multiplexed downstream I2C data line for channel 5; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SC5channel-5-clock
multiplexed downstream I2C clock line for channel 5; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SD6channel-6-data
multiplexed downstream I2C data line for channel 6; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SC6channel-6-clock
multiplexed downstream I2C clock line for channel 6; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SD7channel-7-data
multiplexed downstream I2C data line for channel 7; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC
SC7channel-7-clock
multiplexed downstream I2C clock line for channel 7; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
Type · I2CVoltage · logic level follows VCC

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	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	main upstream I2C serial-clock line into the mux; product page describes routing future I2C communication to the selected channel	logic level follows VCC, 1.65V to 5.5V operating range
A0		Analog	TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses	logic level follows VCC
A1		Analog	TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses	logic level follows VCC
A2		Analog	TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses	logic level follows VCC
RST		Control	TCA9548A reset input exposed on the breakout schematic	logic level follows VCC
SD0	channel-0-data	I2C	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	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	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	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	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	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	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	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	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	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	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	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	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	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	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	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

Logical pinout · physical placement not verified

Pin details

24 connections

VCC
main I2C/Qwiic bus supply for the TCA9548A mux breakout; SparkFun says the breakout operates from 1.65V to 5.5V
PowerVoltage · 1.65V to 5.5V
GND
common ground for main bus, Qwiic connectors, and header
GroundVoltage · 0V
SDA
main upstream I2C serial-data line into the mux; product page describes one main I2C port controlling eight channels
I2CVoltage · logic level follows VCC, 1.65V to 5.5V operating range
SCL
main upstream I2C serial-clock line into the mux; product page describes routing future I2C communication to the selected channel
I2CVoltage · logic level follows VCC, 1.65V to 5.5V operating range
A0
TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses
AnalogVoltage · logic level follows VCC
A1
TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses
AnalogVoltage · logic level follows VCC
A2
TCA9548A I2C address-select input; SparkFun documents three ADR solder jumpers for eight configurable addresses
AnalogVoltage · logic level follows VCC
RST
TCA9548A reset input exposed on the breakout schematic
ControlVoltage · logic level follows VCC
SD0
multiplexed downstream I2C data line for channel 0; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-0-data
SC0
multiplexed downstream I2C clock line for channel 0; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-0-clock
SD1
multiplexed downstream I2C data line for channel 1; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-1-data
SC1
multiplexed downstream I2C clock line for channel 1; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-1-clock
SD2
multiplexed downstream I2C data line for channel 2; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-2-data
SC2
multiplexed downstream I2C clock line for channel 2; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-2-clock
SD3
multiplexed downstream I2C data line for channel 3; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-3-data
SC3
multiplexed downstream I2C clock line for channel 3; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-3-clock
SD4
multiplexed downstream I2C data line for channel 4; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-4-data
SC4
multiplexed downstream I2C clock line for channel 4; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-4-clock
SD5
multiplexed downstream I2C data line for channel 5; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-5-data
SC5
multiplexed downstream I2C clock line for channel 5; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-5-clock
SD6
multiplexed downstream I2C data line for channel 6; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-6-data
SC6
multiplexed downstream I2C clock line for channel 6; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-6-clock
SD7
multiplexed downstream I2C data line for channel 7; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-7-data
SC7
multiplexed downstream I2C clock line for channel 7; SparkFun says the board provides one Qwiic connector for each of eight multiplexed channels
I2CVoltage · logic level follows VCC
channel-7-clock

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