PCA9548A

The PCA9548A is an NXP octal bi-directional translating switch controlled through the I2C bus, in a 24-pin package, that fans one upstream SCL and SDA pair out to eight downstream pairs, or channels. Any individual channel or combination of channels can be selected through the programmable control register, so a designer can isolate a section of the bus, resolve an address conflict between eight identical devices, divide the bus capacitance or hot-swap a board without disturbing the rest. The device is compatible with the I2C bus and the SMBus standard, it has an active-low reset input and three address pins that allow up to eight switches on one bus, it powers up with all the channels deselected and it uses low on-resistance switches that also allow a voltage-level translation between the two sides. The translation and the isolation make the part useful where a low-voltage host talks to a higher-voltage section or where a fault in one section must not take the whole bus down. Typical applications include an industrial control board, a server, a networking system and any design that must fan out or isolate the I2C bus. Every device BeiLuo ships is factory-traceable and includes an import declaration, a certificate of origin and a RoHS compliance file. Our FAE team helps you plan the bus and the addressing.