The NXP PA9544A is a high-performance, low-voltage 4-channel I²C-bus switch with interrupt logic and reset. Designed to enhance I²C-bus capabilities, this switch allows multiple I²C devices with the same address to be connected to a single bus system. It is particularly useful in complex systems, where multiple identical devices must be accessed through the same I²C bus.

Key Features

• Channel Selection: The PA9544A provides 4 bidirectional translating switches that can be controlled via the I²C-bus, enabling connection to any one of those downstream channels.
• Interrupt Logic: Each channel has a dedicated interrupt input which can be monitored through the interrupt output of the PA9544A, simplifying the handling of interrupt signals from multiple I²C devices.
• Active-Low Reset Input: An active-low reset input allows the system to reset the I²C-bus switch during power-up or whenever a system reset is needed, ensuring a clean start for I²C communications.
• Low RON Switches: The low on-resistance of the switches allows for minimal signal distortion and supports bidirectional communication between devices.

Applications

The PA9544A is ideal for a variety of applications that require I²C-bus communications. It is particularly useful in:

• Server and telecom infrastructure
• Industrial control systems
• Consumer electronics
• Medical equipment
• Networking equipment

Technical Specifications

Operating within a supply voltage range of 2.3V to 5.5V, the NXP PA9544A supports both standard-mode and fast-mode I²C-bus devices and is compatible with SMBus standards. It is available in a 20-pin TSSOP package, ensuring a compact footprint for system designs.

In conclusion, the NXP PA9544A is a versatile and reliable solution for expanding I²C-bus functionality in complex electronic systems. Its ability to manage multiple devices with the same address, along with its built-in interrupt logic and reset features, make it an essential component for advanced I²C-bus communication requirements.