The TCA9848 device has eight bidirectional translating switches that can be controlled through the I2C bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. These downstream channels can be used to resolve I2C target address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7.
The system controller can reset the TCA9848 in the event of a time-out, or other improper operation by asserting a low in the RESET input. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state machine. Asserting RESET causes the same reset and initialization to occur without powering down the part. This allows recovery if one of the downstream I2C buses get stuck in a low state.
The pass gates of the switches are constructed so that VDD1/VDD2 pins can be used to limit the maximum high voltage, which is passed by the TCA9848. Limiting the maximum high voltage allows the use of different bus voltages on each pair, so that 0.65V, 0.8V, 1.2V, or 1.8V parts can communicate with 3.3V parts, without any additional protection. External pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 3.6V tolerant.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | TCA9848 Ultra Low-Voltage 8-Channel 1MHz Capable I2 C Switch datasheet | PDF | HTML | 29 Apr 2026 |
| Application note | Multiplexer/Switch Solutions for Fast Mode Plus I2C Applications | PDF | HTML | 14 Jan 2026 |
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The TCA984748-EVM is used to evaluate the performance of the TCA9847 and TCA9848. The evaluation module (EVM) does not come with a soldered unit. A sample can be ordered online at the bottom of the product page. The EVM allows for engineers to evaluate the TCA9847 and TCA9848 I2C signaling (...)
The TMUX-24PW-EVM evaluation module allows for the quick prototyping and DC characterization of the TI line of TMUX products that use 16-, 20- or 24-pin TSSOP packages (PW) and is rated for high-voltage operation.
The TMUXBQB-DYYEVM allows for the quick prototyping and DC characterization of our line of TMUX products that use the 16-pin TSSOP (PW), WQFN (BQB) and SOT-23 THIN (DYY) packages.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| TSSOP (PW) | 24 | Ultra Librarian |
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