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The TCA9545A is a quad bidirectional translating switch controlled via theI2C bus. The SCL/SDA upstream pair fans out to four downstream pairs, orchannels. Any individual SCn/SDn channel or combination of channels can be selected, determined bythe contents of the programmable control register. Four interrupt inputs(RESET low resets the I2C statemachine and causes all the channels to be deselected, as does the internal power-on resetfunction.
The pass gates of the switches are constructed such that the VCC terminal can be used tolimit the maximum high voltage, which will be passed by the TCA9545A. This allows the use ofdifferent bus voltages on each pair, so that 1.8-V, 2.5-V, or 3.3-V parts can communicate with 5-Vparts, without any additional protection. External pull-up resistors pull the bus up to the desiredvoltage level for each channel. All I/O terminals are 5.5 V tolerant.
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