TCA9548A 8-Channel I2C Multiplexer
8-channel bidirectional I2C/SMBus switch with reset, used to resolve address conflicts between identical I2C sensor breakouts by isolating each device on its own sub-bus.
Aliase:TCA9548A, PCA9548A, I2C Mux, I2C Multiplexer, 8-Channel I2C Switch
TSSOP-24 Top View
24 Pins
Pinout Table24
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | A0 | Digital | I2C Address Select Bit 0 |
| 2 | A1 | Digital | I2C Address Select Bit 1 |
| 3 | A2 | Digital | I2C Address Select Bit 2 |
| 4 | /RESET | Digital | Active-Low Reset Input |
| 5 | VSS | Ground | 0V System Ground |
| 6 | SD0 | Digital | Channel 0 SDA (Downstream I2C Data) |
| 7 | SC0 | Digital | Channel 0 SCL (Downstream I2C Clock) |
| 8 | SD1 | Digital | Channel 1 SDA (Downstream I2C Data) |
| 9 | SC1 | Digital | Channel 1 SCL (Downstream I2C Clock) |
| 10 | SD2 | Digital | Channel 2 SDA (Downstream I2C Data) |
| 11 | SC2 | Digital | Channel 2 SCL (Downstream I2C Clock) |
| 12 | SD3 | Digital | Channel 3 SDA (Downstream I2C Data) |
| 13 | SC3 | Digital | Channel 3 SCL (Downstream I2C Clock) |
| 14 | SD4 | Digital | Channel 4 SDA (Downstream I2C Data) |
| 15 | SC4 | Digital | Channel 4 SCL (Downstream I2C Clock) |
| 16 | SD5 | Digital | Channel 5 SDA (Downstream I2C Data) |
| 17 | SC5 | Digital | Channel 5 SCL (Downstream I2C Clock) |
| 18 | SD6 | Digital | Channel 6 SDA (Downstream I2C Data) |
| 19 | SC6 | Digital | Channel 6 SCL (Downstream I2C Clock) |
| 20 | SD7 | Digital | Channel 7 SDA (Downstream I2C Data) |
| 21 | SC7 | Digital | Channel 7 SCL (Downstream I2C Clock) |
| 22 | SDA | Digital | Upstream I2C Data (to Host Controller) |
| 23 | SCL | Digital | Upstream I2C Clock (from Host Controller) |
| 24 | VDD | Power | +1.65V to +5.5V Power Supply |