8-Channel I2C Multiplexer TCA9548A

This I2C multiplexer with the Texas Instruments TCA9548A allows several I2C sensors with the same address to be operated on one microcontroller. The microcontroller switches one or more of the eight channels onto the bus. The address of the multiplexer is set between 0x70 and 0x77 via inputs A0 to A2, so up to eight TCA9548A can be connected to one microcontroller.

Features:

• 8 channels SD0/SC0 to SD7/SC7
• Address 0x70 with A0 to A2 not connected
• RST input for reset
• Operation with 3.3 V or 5 V

Application Examples:

• Several identical sensors on one bus, for example several BME280 or OLED displays
• Splitting an I2C bus into individually switchable sections

Documentation:

• TCA9548A guide (Adafruit, different module with the same chip)
• Library and tutorial I2C multiplexer TCA9548A (Meine Arduino-Projekte, German)
• TCA9548A datasheet (PDF)

Technical Data:

• Chip: TCA9548A
• Operating voltage: 1.65 V to 5.5 V
• Default I2C address: 0x70
• I2C address range: 0x70 to 0x77, address = 0x70 + A0 + 2 × A1 + 4 × A2 (to VIN = 1, to GND = 0)
• Connections: VIN, GND, SDA, SCL, RST, A0, A1, A2, SD0 to SD7, SC0 to SC7
• Dimensions: 32 × 22 × 3 mm
• Weight: 3.8 g

Scope of Delivery:

• 1× 8-Channel I2C Multiplexer TCA9548A
• 1× pin header set