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I2C Multiplexers/Switches
Our vast portfolio of I2C logic products includes a selection of multiplexers and switches for connecting an upstream I2C-bus to any combination of downstream I2C buses.
Multiplexers (muxes) and switches fan the input I2C/ SMBus signals to two, four or eight downstream channels of SCx/SDx pairs. Control is performed directly through the I2C/ SMBus, so there’s no need for an additional control pin. The muxes select one downstream channel at a time; the switches can select one or more. Some devices have an external active-low hardware reset pin (RESET). If the bus locks up or communication with the controller is interrupted, the RESET pin can be used to reset the downstream channels to their default values (“not selected”). These I2C multiplexers/switches work with I2C interfaces for applications such as: fault isolation, address conflict, level translation or broadcast communication.
I2C Multiplexers/Switches Portfolio
P3S0200GM
I3C or I2C 2:1 or 1:2 mux with hardware select pin allowing bus voltage up to 5.5 V
PCA9541A
2-to-1 I2C-bus controller selector with interrupt logic and reset
PCA9542A
2-channel I2C-bus multiplexer and interrupt logic
PCA9544A
4-channel I2C-bus multiplexer with interrupt logic
PCA9546A
4-channel I2C-bus switch with reset
PCA9548A
8-channel I2C-bus switch with reset
PCA9847
8-channel ultra-low voltage, Fm+ I2C-bus multiplexer with reset
PCA9849
4-channel ultra-low voltage, Fm+ I2C-bus multiplexer with reset
PCA9540B
2-channel I2C-bus multiplexer
PCA9543A_43B
2-channel I2C-bus switch with interrupt logic and reset
PCA9545A_45B_45C
4-channel I2C-bus switch with interrupt logic and reset
PCA9547
8-channel I2C-bus multiplexer with reset
Multiplexer and Switch Functions
Understand the difference between a multiplexer and a switch.
PCA9848 – Our New Ultra-Low Voltage, Octal Bidirectional Translating Switch Controlled Via the I2C-Bus.
Enjoy the freedom to select any or all SCx/SDx channels, determined by the programmable control register. The SCL/ SDA upstream pair fans out to eight downstream pairs, or channels, making it easy to add more devices to the bus with the same address while keeping the capacitive bus load low.
Additional Documents
NXP System Management I2C, I3C and SPI Selector Guide
Selector guide of interface components for all your design needs.
Read the selector guideSolutions Around the Core – Analog, Interfaces and NFC
Discover other solutions we offer for your designs.
Read the brochureAdd Design Flexibility with Multichannel I2C/SMBus Muxes and Switches
Designed for systems that use multiple I2C/SMBus devices with identical addresses.
Read the fact sheetI3C Switch with Hardware Select and Enable
The P3S0200 is ideally suited for the switching of high-speed I3C-bus signals in computing and server applications, such as servers, workstations and notebooks that have limited I3C-bus controller ports.
Read the fact sheet