PCA9546APW,118
Overview
The PCA9546APW,118 is a 4-channel bidirectional I2C multiplexer designed to resolve address conflicts and simplify bus management in complex systems. It features four independent downstream switch pairs (SCLn, SDAn) that can be selected via I2C commands, allowing a single controller to interface with multiple devices sharing the same address. The device also supports voltage level translation between 1.8V, 2.5V, 3.3V, and 5V rails, making it a versatile tool for mixed-voltage architectures.
Why Choose This Part
This multiplexer offers high flexibility by allowing any combination of the four channels to be selected simultaneously through software. It features an active-LOW hardware reset pin to recover from bus hang conditions and is designed with low Ron switches to minimize signal attenuation. Additionally, it supports hot insertion and consumes a very low standby current of approximately 0.1 uA.
Applications
Key Specifications
Getting Started
To integrate this device, connect the upstream SDA/SCL to your microcontroller and pull the three hardware address pins (A0, A1, A2) high or low to set the device's own I2C address. Use standard I2C write commands to the PCA9546A control register to enable or disable specific downstream channels. Ensure appropriate pull-up resistors are placed on each active downstream branch as they are isolated when the switch is open.
