Product Overview: NXP PCA9542PW I²C Multiplexer

The NXP PCA9542PW is a high-performance, 2-channel I²C-bus multiplexer that is designed to provide flexible expansion to standard I²C-bus systems. This integrated circuit (IC) is particularly useful in applications where multiple I²C devices with the same address need to be accessed separately. The PCA9542PW allows two downstream channels to be selected via the I²C-bus itself, effectively enabling seamless communication with multiple devices.

Key Features

• Two Selectable Channels: It offers two bidirectional translating switches that can be controlled via the I²C-bus, providing access to multiple peripherals with the same address.
• Low Standby Current: This feature is essential for power-sensitive applications, as it helps to minimize power consumption when the device is not actively switching.
• Channel Selection Via I²C Bus: The PCA9542PW allows for channel selection through the I²C-bus interface, simplifying the design and reducing the need for additional control lines.
• Active-Low Interrupt Inputs: Each channel has an active-low interrupt input which can be used to alert the upstream I²C master when an interrupt is asserted on either of the downstream channels.

Applications

The PCA9542PW is an ideal solution for a variety of applications that require I²C-bus expansion. It is commonly used in:

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

Technical Specifications

The device operates over a wide supply voltage range (2.3V to 5.5V) and is fully compliant with the I²C-bus specification. Packaged in a TSSOP16 (thin shrink small outline package), the PCA9542PW is designed for space-constrained applications. Additionally, it supports both standard (100kHz) and fast (400kHz) I²C-bus modes, making it a versatile choice for systems that require different communication speeds.