Figure 5: The P3S0200GMX I3C switch can be used to reconfigure an I3C bus by routing I3C bus signals between an I3C controller and multiple sets of target devices, or between a single target and multiple I3C controllers. (Image source: NXP Semiconductors)
(pedometer). As an I3C sensor, it operates at 12.5 MHz in SDR mode and 25 MHz in DDR mode. ICs such as the NXP P3S0200GMX I3C switch can reconfigure the I3C bus by routing I3C bus signals between an I3C controller and multiple sets of target devices, or between a single target and multiple I3C controllers as determined by an external MCU (Figure 5). Switching between two targets might be required if both targets have the same address and cannot reside on the same bus. Alternatively, a single target
might have to be shared between two processes, requiring a switch between the two I3C controllers.
Conclusion I3C is a serial interface that extends the I²C bus by increasing its data rate, reducing the number of wires, and adding flexibility to the bus control. It is an enhancement that extends the usefulness of legacy I²C and SPI interfaces.
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