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PCA9545 from PHI,Philips

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PCA9545

Manufacturer: PHI, PHIL

4-channel I2C switch with interrupt logic and reset

Partnumber Manufacturer Quantity Availability
PCA9545 PHI, PHIL 101 In Stock

Description and Introduction

4-channel I2C switch with interrupt logic and reset **Introduction to the PCA9545 from Philips**  

The PCA9545 is a versatile I²C bus multiplexer designed by Philips (now NXP Semiconductors) to address the challenges of managing multiple I²C devices on a single bus. This component enables seamless communication between a master controller and up to four downstream I²C channels, allowing efficient expansion of I²C networks without address conflicts.  

Featuring bidirectional voltage-level translation, the PCA9545 supports mixed-voltage systems, ensuring compatibility between devices operating at different logic levels. Its low ON resistance minimizes signal distortion, preserving data integrity across connected peripherals.  

The device is controlled via the I²C interface, with channel selection determined by programmable registers. Interrupt outputs provide real-time status updates, enhancing system responsiveness. Additionally, the PCA9545 includes power-up reset functionality, ensuring a safe initialization state.  

Ideal for applications such as industrial control, consumer electronics, and embedded systems, the PCA9545 simplifies complex I²C topologies while maintaining robust performance. Its compact packaging and low power consumption make it suitable for space-constrained designs.  

By offering reliable bus management and voltage adaptation, the PCA9545 serves as a critical component in modern I²C-based systems, streamlining connectivity and improving scalability.

Application Scenarios & Design Considerations

4-channel I2C switch with interrupt logic and reset

Alternative Part Number

  • TCA9545APWR --: Pin-compatible 4-channel I2C switch with interrupt logic, direct functional equivalent to the PCA9545 in a TSSOP package.
  • PCA9545APWR --: Same 4-channel I2C multiplexer function from TI's PCA9545A series, widely available and drop-in compatible.
  • PCA9544APW --: Same 4-channel I2C switch family from NXP, very similar register map and control logic, minor differences in interrupt handling.
  • TCA9544APWR --: 4-channel I2C multiplexer with interrupt output, close functional match and widely available alternative.
  • TCA9545APW --: Same device as TCA9545APWR but in tube packaging; electrically identical 4-channel I2C switch suitable as a replacement.

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