TCA9548A Low-Voltage 8-Channel I2C Switch with Reset - (AD38711)

Description:

The TCA9548A device features eight bidirectional translating switches controllable via the I₂C bus. The upstream SCL/SDA pair is fanned out to eight downstream pairs or channels. Any individual SCn/SDn channel or combination of channels can be selected, depending on the contents of the programmable control register. These downstream channels can be used to resolve I₂C slave address conflicts. For example, if eight identical digital temperature sensors are needed in an application, one sensor can be connected to each channel: 0-7. The system master can reset the TCA9548A in case of timeout or other incorrect operation by asserting a low state on the RESET input. Similarly, power-on reset deselects all channels and initializes the I₂C/SMBus state machine. Asserting RESET causes the same reset and initialization without powering down the component. This allows recovery if one of the downstream I₂C buses gets stuck in a low state. The switch pass gates are designed such that the VCC pin limits the maximum high voltage passed by the TCA9548A. This limiting allows different bus voltages to be used on each pair, so that 1.8V, 2.5V, or 3.3V components can communicate with 5V components without additional protection. External pull-up resistors pull the bus to the desired voltage level for each channel. All I/O pins are 5V tolerant.

Datasheet