8.3 Feature Description

The TCA9543A is a dual channel bidirectional translating switch for I²C buses that supports Standard-Mode (100 kHz) and Fast-Mode (400 kHz) operation. The TCA9543A features I²C control using a single 8-bit control register in which bits 1 and 0 control the enabling and disabling of the two switch channels of I²C data flow. The TCA9543A also supports interrupt signals for each slave channel and this data is held in bits 5 and 4 of the control register. Depending on the application, voltage translation of the I²C bus can also be achieved using the TCA9543A to allow 1.8-V, 2.5-V, or 3.3-V parts to communicate with 5-V parts. Additionally, in the event that communication on the I²C bus enters a fault state, the TCA9543A can be reset to resume normal operation using the RESET terminal feature or by a power-on reset which results from cycling power to the device.