The TCA9548A 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 TCA9548A 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 the VCC pin can be used to limit the maximum high voltage, which is passed by the TCA9548A. Limiting the maximum high voltage allows the use of different bus voltages on each pair, so that 1.8V, 2.5V or 3.3V parts can communicate with 5V 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 5V tolerant.
| Tipo | Título | Fecha | ||
|---|---|---|---|---|
| * | Data sheet | TCA9548A Low-Voltage 8-Channel I2 C Switch with Reset datasheet (Rev. H) | PDF | HTML | 30 sep 2024 |
| Application note | PassFET Hang Time with TCA39306 I2C, I3C Level Translator | PDF | HTML | 23 sep 2024 | |
| Application brief | Best Practices: I2C Devices on an I3C Shared Bus | PDF | HTML | 30 mar 2023 | |
| Application note | I2C Solutions for Hot Swap Applications (Rev. A) | 31 ene 2023 | ||
| Application note | I2C Dynamic Addressing | 25 abr 2019 | ||
| Application note | Choosing the Correct I2C Device for New Designs | PDF | HTML | 07 sep 2016 | |
| Selection guide | I2C Infographic Flyer | 03 dic 2015 | ||
| Technical article | How to simplify I2C tree when connecting multiple slaves to an I2C master | PDF | HTML | 15 oct 2015 | |
| Application note | Understanding the I2C Bus | PDF | HTML | 30 jun 2015 | |
| Application note | Maximum Clock Frequency of I2C Bus Using Repeaters | 15 may 2015 | ||
| Application note | I2C Bus Pull-Up Resistor Calculation | PDF | HTML | 13 feb 2015 | |
| EVM User's guide | TCA9548AEVM User's Guide | 23 abr 2014 |
Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.
El TCA9548AEVM está diseñado para evaluar y demostrar la funcionalidad de la familia TCA954xA de interruptores I2C de TI. El TCA9548AEVM se puede utilizar como módulo de evaluación independiente para interactuar con un sistema existente o emparejado con el Lauchpad MSP430, que sirve como maestro (...)
| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| TSSOP (PW) | 24 | Ultra Librarian |
| VQFN (RGE) | 24 | Ultra Librarian |
| VSSOP (DGS) | 24 | Ultra Librarian |
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