PCA9541PW/03,118

The PCA9541PW/03,118 from NXP Semiconductors is a 2-to-1 I2C-bus master selector, engineered for high-reliability dual-master applications. This specialized interface IC allows for system operation even if one master fails or is removed for maintenance. It supports two masters on separate I2C-buses, connecting to the same downstream slave devices.

Key electrical specifications include an operating voltage range of 2.3V to 5.5V and an I2C/SMBus interface. The device is designed to facilitate communication between different voltage level devices, with pass gates allowing 1.8V, 2.5V, or 3.3V devices to communicate with 5V devices. All I/O pins are 6.0V tolerant.

The PCA9541PW/03,118 is available in a 16-TSSOP surface-mount package. It includes interrupt logic and reset capabilities, with interrupt outputs providing an indication of which master has control of the bus. The device also features a bus recovery/initialization sequence that sends clock pulses and control signals to set downstream devices to an initialized state before switching channels.

This component is suitable for applications requiring robust I2C communication management, such as systems with primary and backup master controllers or where modular maintenance is necessary. The design ensures that a failed master is isolated without affecting communication between the online master and slave devices.