The NXP PCA9542D is a versatile 2-channel I2C-bus multiplexer designed to provide bidirectional translation between primary and secondary I2C or SMBus applications. This integrated circuit allows users to connect multiple I2C devices with the same address to a single I2C bus, effectively solving address collision issues and expanding the number of available I2C nodes within a system.

Key Features

• 2-Channel Multiplexing: The PCA9542D provides two selectable bidirectional translating switches that allow connection of two isolated I2C-bus channels to a primary bus.
• Low Standby Current: The device is optimized for low power consumption, drawing a minimal standby current which is ideal for power-sensitive applications.
• Channel Selection: Channel selection is accomplished through an I2C-bus interface which can be controlled through simple software commands.
• Interrupt Logic: The multiplexer features interrupt logic that conveys interrupts from downstream I2C devices to the upstream master, ensuring proper communication and response to critical events.
• Compatibility: It is fully compliant with I2C-bus specification and supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) I2C modes.

Applications

The PCA9542D is suited for a wide range of applications, particularly in systems where multiple I2C devices with identical addresses need to coexist on the same bus. Typical applications include:

• Server motherboards and computing systems with multiple same-address I2C devices
• Sensor networks where multiple sensors share the same I2C address
• Industrial control systems requiring expansion of I2C communication capabilities
• Consumer electronics that integrate several I2C-enabled components

Technical Specifications

The PCA9542D operates over a supply voltage range of 2.3V to 5.5V and is housed in a compact 20-pin TSSOP package. Its operating temperature range is from -40°C to +85°C, making it suitable for industrial environments.

Ordering Information

The product is available under the orderable part number PCA9542D,112 and is delivered in tape and reel packaging suitable for automated assembly processes.