Description
The NCA9546 is a quad bidirectional translating switch controlled via the I2 C bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register.
An active-low reset (/RESET) input allows the NCA9546 to recover from a situation in which one of the downstream I 2 C buses is stuck in a low state. Pulling /RESET low resets, the I2 C state machine and causes all the channels to be deselected, as does the internal power-on reset function.
The pass gates of the switches are constructed such that the VCC terminal can be used to limit the maximum high voltage, which will be passed by the NCA9546. 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 pullup resistors pull the bus up to the desired voltage level for each channel. All I/O terminals are 5.5 V tolerant.
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