Overview
The PCA9541PW/03,118 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, ensuring seamless communication and control between multiple masters and slaves on the I²C-bus. Although the PCA9541PW is no longer manufactured, it remains a significant component in legacy systems requiring robust I²C-bus management.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | TSSOP16 |
| Number of Leads | 16 |
| Body Width | 4.4 mm |
| Operating Power Supply Voltage | 2.3 V to 5.5 V |
| Input Voltage Tolerance | 6.0 V |
| Clock Frequency | 0 Hz to 400 kHz |
| ESD Protection | 2000 V HBM, 200 V MM, 1000 V CDM |
| Address Pins | 4 (allowing up to 16 devices on the I²C-bus) |
| Reset Input | Active LOW |
| Interrupt Inputs/Outputs | 1 active LOW input, 2 active LOW outputs |
| Bus Initialization/Recovery | Supported with bus traffic sensor |
| 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
- Active LOW interrupt input and two active LOW interrupt outputs
- Active LOW reset input
- Bus initialization/recovery function with bus traffic sensor
- Low Ron switches
- Supports hot insertion
- Software identical for both masters
- Low standby current
- No glitch on power-up
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 PCA9541PW/03,118 used for?
The PCA9541PW/03,118 is used as a 2-to-1 I²C-bus master selector in high reliability dual master I²C-bus applications. - What are the package options for the PCA9541PW?
The PCA9541PW is available in SO16, TSSOP16, and HVQFN16 packages. - What is the operating voltage range of the PCA9541PW?
The operating power supply voltage range is from 2.3 V to 5.5 V. - Does the PCA9541PW 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 purpose of the bus initialization/recovery function?
The bus initialization/recovery function ensures that downstream I²C-bus devices are initialized before switching the channel to the selected master. - How many devices can be connected on the I²C-bus using the PCA9541PW?
Up to 16 devices can be connected on the I²C-bus using the 4 address pins. - What is the clock frequency range supported by the PCA9541PW?
The clock frequency range is from 0 Hz to 400 kHz. - Does the PCA9541PW have ESD protection?
Yes, it has ESD protection exceeding 2000 V HBM, 200 V MM, and 1000 V CDM. - What is the reset input type of the PCA9541PW?
The reset input is active LOW. - Is the PCA9541PW still in production?
No, the PCA9541PW is no longer manufactured.
