The TCA9546A is a quad bidirectional translating switch controlled via the I2C bus. The SCL/SDA upstream pair fans out to four 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.
An active-low reset (RESET) input allows the TCA9546A to recover from a situation in which one of the downstream I2C buses is stuck in a low state. Pulling RESET low resets the I2C state machine and causes all the channels to be deselected, as does the internal power-on reset function.
The pass gates of the switches are constructed such that the VCC pin can be used to limit the maximum high voltage, which will be passed by the TCA9546A. This allows the use of different bus voltages on each pair, so that 1.8-V, 2.5-V, or 3.3-V parts can communicate with 5-V parts without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5.5-V tolerant.
| Tipo | Título | Fecha | ||
|---|---|---|---|---|
| * | Data sheet | TCA9546A Low Voltage 4-Channel I2C and SMBus Switch with Reset Function datasheet (Rev. B) | PDF | HTML | 29 oct 2019 |
| 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 | ||
| 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 |
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.
The TCA9548AEVM is designed to evaluate and demonstrate the functionality of TI’s TCA954xA family of I2C switches. The TCA9548AEVM can be used as a standalone evaluation module to interface with an existing system or paired with the MSP430 Lauchpad which serves as the I2C master and power supply (...)
| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| SOIC (D) | 16 | Ultra Librarian |
| TSSOP (PW) | 16 | Ultra Librarian |
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