Overview
The PCA9541PW/01,112, produced by NXP USA Inc., is a 2-to-1 I2C-bus master selector designed for high-reliability dual-master I2C-bus applications. This component is particularly useful in systems where multiple masters need to share the same I2C bus, ensuring smooth and reliable communication. It features interrupt logic and reset capabilities, making it versatile for various system configurations.
Key Specifications
| Parameter | Value |
|---|---|
| Package | TSSOP16 |
| Supply Voltage | 2.3 V to 5.5 V |
| Clock Frequency | 0 Hz to 400 kHz |
| Address Pins | 4 (allowing up to 16 devices on the I2C-bus) |
| Interrupt Inputs/Outputs | Active LOW interrupt input, 2 active LOW interrupt outputs |
| Reset Input | Active LOW reset input |
| ESD Protection | Exceeds 2000 V HBM, 200 V MM, 1000 V CDM |
| Latch-up Testing | Exceeds 100 mA per JEDEC Standard JESD78 |
| Input Tolerance | 6.0 V tolerant inputs |
| Standby Current | Low standby current |
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
- Voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses
- No glitch on power-up
- Supports hot insertion
- Software identical for both masters
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/01,112?
The PCA9541PW/01,112 is a 2-to-1 I2C-bus master selector, designed to manage dual-master I2C-bus applications. - What are the supported supply voltage ranges for this component?
The component operates within a supply voltage range of 2.3 V to 5.5 V. - How many devices can be connected to the I2C-bus using this component?
Up to 16 devices can be connected using the 4 address pins. - What is the purpose of the interrupt inputs and outputs?
The active LOW interrupt input and outputs are used to signal events such as non-idle conditions on the downstream slave channel. - Does the PCA9541PW/01,112 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 initialization/recovery function?
This function helps in initializing or recovering the bus for slave devices without the need for a hardware reset. - Is the PCA9541PW/01,112 compatible with SMBus standards?
Yes, it is compatible with SMBus standards. - What types of packages are available for this component?
The component is available in SO16, TSSOP16, and HVQFN16 packages. - Does the component support hot insertion?
Yes, it supports hot insertion. - What is the purpose of the active LOW reset input?
The active LOW reset input allows the device to be initialized to its default state.
