Product Overview: NXP PCA9544ABS

The NXP PCA9544ABS is a high-performance, low-voltage 4-channel I²C-bus switch with interrupt logic, designed to provide multiplexing capabilities for I²C-bus lines. This versatile integrated circuit allows four separate I²C-bus slave or master nodes to be connected to a single I²C-bus master or slave through one of four selectable channels. This capability makes it an ideal solution for overcoming bus address conflicts and enabling multiple I²C devices with the same address to coexist within a single system.

With a supply voltage range from 2.3V to 5.5V, the PCA9544ABS is suitable for interfacing with both standard and low-voltage I²C devices, making it extremely versatile for various applications. The device supports I²C-bus clock frequencies up to 400 kHz, providing the speed needed for efficient data transactions.

Key Features:

• Channel Selection: The PCA9544ABS offers four bidirectional translating switches that can be selected via the I²C-bus, allowing for seamless channel switching.
• Interrupt Function: An interrupt input is available for each of the four connected slave channels, and an interrupt output ensures that the master is informed of an interrupt request without having to poll each slave.
• Low Standby Current: The device's low standby current makes it suitable for power-sensitive applications.
• Active-Low Reset Input: The inclusion of an active-low reset input allows the system to recover from a situation where one of the I²C-bus devices is stuck in a bus-hold condition.
• Compatibility: It is compatible with both Standard-mode and Fast-mode I²C-bus devices in addition to SMBus applications.

Applications:

The PCA9544ABS is designed for a broad range of applications, including servers, networking equipment, consumer electronics, and telecommunication systems, where multiple I²C devices need to be accessed independently. Its ability to expand I²C-bus inputs makes it particularly useful in complex systems with limited GPIOs.

Package and Quality:

Enclosed in a 20-pin TSSOP package, the PCA9544ABS ensures a compact footprint on PCBs. NXP's commitment to quality means that this product is manufactured to the highest standards, ensuring reliable performance for critical applications.