PCA9541PW/02,112

Specialized Overview

The PCA9541PW/02,112 is a 2-to-1 I2C-bus master selector manufactured by NXP USA Inc. in a 16-TSSOP package. It operates on a supply voltage of 2.3 V to 5.5 V with a clock frequency range of 0 Hz to 400 kHz. The device supports voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses, featuring 6.0 V tolerant inputs. It includes interrupt logic, reset functionality, and bus initialization/recovery capabilities for high-reliability dual-master applications.

Specialized Feature Summary

• Bidirectional 2-to-1 master selector with I2C interface logic compatible with SMBus standards
• Integrated interrupt logic and active LOW reset input for system initialization
• Bus initialization/recovery function to set downstream devices to an initialized state
• Voltage level translation allowing communication between different bus voltages without additional protection

Specialized Applications

• High reliability systems with dual masters
• Gatekeeper multiplexer on long single bus
• Bus initialization/recovery for slave devices without hardware reset
• Allows masters without arbitration logic to share resources

Specialized Procurement Notes

Verify the specific ordering suffix against official documentation to confirm power-up channel selection behavior. Confirm package type and temperature range requirements match the application design specifications before procurement.

Specialized Selection Notes

Select based on required power-up channel state and interrupt masking needs. Ensure external pull-up resistors are included for all I/O pins as internal resistors are not provided. Consider ESD protection ratings and latch-up testing compliance for harsh environments.

Specialized Part Context

The PCA9541 series provides a hardware-based solution for managing I2C bus contention in redundant systems. It isolates failed masters from the downstream bus, ensuring continuous operation. The TSSOP16 package offers a compact form factor suitable for space-constrained designs requiring high reliability.

Specialized Replacement Considerations

PCA9541A is a subsequent version with updated documentation. Verify register compatibility and pinout consistency when substituting.