PCA9546ADR

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PCA9546ADR is a digital port selector and multiplexer device. It can be used to select one of up to four I2C or SMBus inputs and the selected input can be sent to a single output or broadcast to all outputs. This allows multiple slaves to be connected to a single bus or multiple buses to be connected to a single master.

PCA9546ADR comes with a variety of package options including a 3mm x 3mm QFN package, making it very convenient to use in space-constrained applications. The device can be configured to operate from a single power supply ranging from 1.8V to 5V, making it suitable for many low-voltage and mixed-voltage applications. It also has various enable/disable conditions, allowing for greater flexibility and control.

The device is controlled by two serial data (SDA and SCL) lines that are common to all five ports. It also features a programmable interrupt output (INT) to indicate the status of the selector. This allows the designer to know if a port has been chosen, or if there is a contention on the bus.

PCA9546ADR has a wide range of application fields. One of the most popular applications is to extend the connecting distance of a I2C bus system, allowing slaves to be connected at a much greater distance than normally possible. It can also be used in systems to connect multiple masters to a single bus, or to route communications to and from different slave buses in a multi-master system.

Another application for PCA9546ADR is for power-over-I2C systems. It is possible to configure the device to enable only the port that is being used, which saves power when a particular port isn’t in use. Additionally, the interrupt output can be used to indicate events such as a switch to a new port or a contention on the bus.

The working principle behind PCA9546ADR is fairly simple. The two-wire interface consists of two data lines (SDA and SCL) that are shared among all five ports. When the device is powered up, all ports will be in the control logic ‘high-impedance’ state. This state allows the ports to be configured as either inputs or outputs. Each port is controlled by a select line that is asserted low to activate the port and send the data out.

The PCA9546ADR has a combinatorial logic and can be programmed to have different configurations. For example, it can be programmed to send the data from the selected input to a single output or to broadcast it to all outputs. The device will de-assert the selector line when it’s done transferring the data and revert to the high-impedance state, ready for a new selection.

By providing a fast, low-voltage, and flexible multiplexing solution, PCA9546ADR is the ideal solution for selectable I2C and SMBus applications. It can be used to extend the distance of an I2C bus, for power-over-I2C applications, and for connecting multiple masters to a single bus. With its wide range of package options, programmable features, and ease of use, PCA9546ADR is the perfect choice for advanced digital port selectors and multiplexer applications.

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