The PCA9544A is a 4-channel, bidirectional translating multiplexer for I²C buses that supports Standard-Mode (100 kHz) and Fast-Mode (400 kHz) operation. The PCA9544A features I²C control using a single 8-bit control register in which the three least significant bits control the enabling and disabling of the 4 switch channels of I²C data flow. The PCA9544A also supports interrupt signals for each slave channel and this data is held in the four most significant bits of the control register. Depending on the application, voltage translation of the I²C bus can also be achieved using the PCA9544A 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 PCA9544A can be reset to resume normal operation by means of a power-on reset which results from cycling power to the device.