The TCA9544A is a 4-channel, bidirectional translating I2C Muliplexer. The master SCL/SDA
signal pair is directed to one of the four channels of slave devices, SC0/SD0-SC3/SD3. Four
interrupt inputs (INT3–INT0), one for each of the
downstream pairs, are provided. One interrupt output (INT) acts as an AND of
the four interrupt inputs.
A power-on reset function returns the registers to their default state and initializes
the I2C state machine, with all channels deselected.
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 TCA9544A. 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.
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