SCPS209C May 2014 – November 2019 TCA9544A
The TCA9544A is a 4-channel, bidirectional translating multiplexer for I2C buses that supports Standard-Mode (100 kHz) and Fast-Mode (400 kHz) operation. The TCA9544A 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 TCA9544A 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 TCA9544A 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 TCA9544A can be reset to resume normal operation by means of a power-on reset which results from cycling power to the device.