The NXP PCA9543CPW is a 2-channel I²C-bus multiplexer with interrupt logic, providing the capability to connect multiple I²C devices with the same address or different address ranges to a single I²C bus. The device is designed to work with the I²C-bus fast mode and is housed in a compact TSSOP-16 package, making it suitable for space-constrained applications.

Key Features

• Two Selectable I²C-Bus Channels: Allows for the connection of two separate I²C slave sub-buses to a single master I²C bus, effectively expanding the number of I²C devices that can be interfaced.
• Interrupt Logic: Features an interrupt input for each channel, enabling the master to be alerted of an event on any of the connected slave devices without the need for constant polling.
• Channel Selection: Via I²C-bus, the multiplexer allows for the selection of active channels using programmable control registers.
• High-Speed Operation: Compatible with I²C-bus fast mode (400 kHz), providing quick data transfer rates for efficient system performance.
• Low Standby Current: Designed for power-sensitive applications, the PCA9543CPW offers a low standby current, making it an energy-efficient choice.
• Active-Low Reset Input: Includes an active-low reset input that initializes the I²C-bus state machine and deselects all channels, allowing for system recovery without power cycling.

Applications

The NXP PCA9543CPW is ideal for a variety of applications where multiple I²C devices need to be connected. It is commonly used in:

• Server systems
• Telecommunications equipment
• Industrial control systems
• Consumer electronics
• Medical equipment

Technical Specifications

With a supply voltage range of 2.3V to 5.5V, the PCA9543CPW can be used in various system configurations. Its operating temperature range of -40°C to +85°C ensures reliability across diverse environments. The multiplexer's TSSOP-16 packaging is optimized for surface-mount technology, facilitating integration into modern PCB designs.