NXP PCA9545AD 4-Channel I2C Switch

The PCA9545AD is a high-performance, 4-channel I2C-bus switch with an interrupt logic from NXP Semiconductors. This integrated circuit is designed to provide multi-channel access for I2C devices that operate at clock frequencies up to 400 kHz. The PCA9545AD allows for the connection of up to four separate I2C-bus slave devices to a single I2C-bus master, effectively expanding the I2C-bus connectivity and enabling communication with multiple I2C devices that may have identical addresses.

Key Features:

• Channel Selection: The device offers four bidirectional translating switches that can be controlled via the I2C-bus, allowing for the selection of any combination of the I2C-bus slave devices.
• Interrupt Function: Each switch has an interrupt input that is aggregated to produce a master interrupt output, ensuring prompt attention by the host when an event occurs on any of the connected slave devices.
• Low Standby Current: The PCA9545AD is optimized for low power consumption, drawing a minimal standby current, making it suitable for power-sensitive applications.
• Compatibility: It is fully compatible with 5V I2C-bus and SMBus protocols, allowing for easy integration into existing systems.

Applications:

The PCA9545AD is ideal for a variety of applications where multiple I2C devices need to be accessed. It is commonly used in:

• Server systems and server motherboards
• Industrial control systems
• Telecommunications equipment
• Consumer electronics
• Medical equipment
• Automotive infotainment systems

Technical Specifications:

• Supply Voltage: 2.3V to 5.5V
• Operating Temperature: -40°C to +85°C
• Packaging: 20-pin TSSOP
• Compliance: RoHS compliant and Lead-Free

With its versatility and ease of use, the PCA9545AD from NXP is a reliable choice for system designers looking to enhance I2C-bus capabilities in their next project.