NXP PCA9545BPW,118 4-Channel I2C Multiplexer

The PCA9545BPW,118 is a high-performance, 4-channel I2C-bus switch with interrupt logic, designed by NXP Semiconductors. This integrated circuit (IC) allows users to expand their I2C-bus by providing the ability to select up to four separate I2C devices using a single master. It is particularly useful in applications where multiple I2C devices with the same address need to be accessed separately.

Each of the four channels of the PCA9545BPW,118 can be independently enabled or disabled by writing to the internal control register through the I2C-bus. The device also features an interrupt input for each of the downstream pairs, which is propagated to the master to signal the presence of important conditions on the I2C-bus.

Manufactured in a TSSOP-20 package, the PCA9545BPW,118 is designed for a wide range of applications, including servers, telecom infrastructure, base stations, and industrial control systems. The versatility of this multiplexer makes it an ideal choice for systems that require multiple I2C devices to be controlled through a single I2C-bus, ensuring efficient communication and saving valuable board space.

Key features of the PCA9545BPW,118 include:

• Operating power supply voltage range of 2.3V to 5.5V
• 5-channel I2C-bus switch with reset
• Four interrupt inputs, one for each of the downstream channels
• Active LOW interrupt output
• Channel selection via I2C-bus
• Low RON switches
• Allows voltage level translation between 1.8V, 2.5V, 3.3V, and 5V buses
• No glitch on power-up
• Supports hot insertion
• Low standby current
• Operating temperature range from -40°C to +85°C
• Compliant with the I2C-bus Fast and Standard modes

By integrating the PCA9545BPW,118 into your design, you can simplify PCB layout, reduce the complexity of your I2C-bus designs, and enhance the overall reliability of your system. Its ability to switch between multiple I2C devices, while managing signal integrity with low RON switches, makes it a robust and essential component for any I2C-bus expansion needs.