Overview
The PCA9541PW/01,118 is a 2-to-1 I2C-bus master selector produced by NXP USA Inc. This component is designed for high reliability in dual master I2C-bus applications. It features advanced interrupt logic and reset capabilities, making it suitable for complex system designs where multiple masters need to share the I2C bus.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 16-TSSOP |
| Supply Voltage | 2.3 V to 5.5 V |
| Clock Frequency | 0 Hz to 400 kHz |
| Interface | I²C, SMBus |
| Address Pins | 4 (allowing up to 16 devices on the I2C-bus) |
| Reset Input | Active LOW |
| Interrupt Inputs/Outputs | Active LOW interrupt input, 2 active LOW interrupt outputs |
| ESD Protection | Exceeds 2000 V HBM, 200 V MM, 1000 V CDM |
| Latch-up Testing | Exceeds 100 mA per JEDEC Standard JESD78 |
| Standby Current | Low |
| Voltage Level Translation | Between 1.8 V, 2.5 V, 3.3 V, and 5 V buses |
Key Features
- 2-to-1 bidirectional master selector
- I2C-bus interface logic compatible with SMBus standards
- Channel selection via I2C-bus
- Bus initialization/recovery function
- Bus traffic sensor
- Low Ron switches
- No glitch on power-up
- Supports hot insertion
- Software identical for both masters
- Active LOW reset input and interrupt inputs/outputs
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
Q & A
- What is the primary function of the PCA9541PW/01,118?
The PCA9541PW/01,118 is a 2-to-1 I2C-bus master selector designed to manage multiple masters on an I2C bus. - What is the operating voltage range of the PCA9541PW/01,118?
The operating voltage range is from 2.3 V to 5.5 V. - What interfaces does the PCA9541PW/01,118 support?
The component supports I²C and SMBus interfaces. - How many devices can be connected to the I2C-bus using the PCA9541PW/01,118?
Up to 16 devices can be connected using the 4 address pins. - What is the purpose of the active LOW reset input?
The active LOW reset input allows the PCA9541 to be initialized and resets the I2C-bus state machine to its default state. - Does the PCA9541PW/01,118 support voltage level translation?
Yes, it supports voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses. - What is the significance of the bus traffic sensor in the PCA9541PW/01,118?
The bus traffic sensor detects non-idle conditions on the downstream slave channel and generates an interrupt if necessary. - Is the PCA9541PW/01,118 suitable for hot insertion?
Yes, it supports hot insertion. - What kind of ESD protection does the PCA9541PW/01,118 offer?
The component exceeds 2000 V HBM, 200 V MM, and 1000 V CDM in ESD protection. - What are the common applications of the PCA9541PW/01,118?
Common applications include high reliability systems with dual masters, gatekeeper multiplexers, and bus initialization/recovery for slave devices.
