Overview
The PCA9541APW/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 I2C-bus without conflicts. It features interrupt logic, reset capabilities, and bus initialization/recovery functions, making it versatile for various applications requiring robust I2C communication.
Key Specifications
| Parameter | Description |
|---|---|
| Package | 16-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| Interface | I2C, SMBus |
| Voltage - Supply | 2.3 V to 5.5 V |
| Clock Frequency | 0 Hz to 400 kHz |
| Address Pins | 4 address pins allowing up to 16 devices on the I2C-bus |
| Interrupt Inputs/Outputs | 1 active LOW interrupt input, 2 active LOW interrupt outputs |
| Reset Input | Active LOW reset input |
| Bus Initialization/Recovery | Bus initialization/recovery function with bus traffic sensor |
| ESD Protection | Exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101 |
| Latch-up Testing | Exceeds 100 mA per JEDEC Standard JESD78 |
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
- Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses
- Supports hot insertion
- Software identical for both masters
- Low standby current
- 6.0 V tolerant inputs
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 PCA9541APW/01,112?
The PCA9541APW/01,112 is a 2-to-1 I2C-bus master selector designed to manage dual master I2C-bus applications.
- What are the supported voltage ranges for this component?
The component operates with a supply voltage range of 2.3 V to 5.5 V.
- What types of packages are available for the PCA9541APW/01,112?
The component is available in SO16, TSSOP16, and HVQFN16 packages.
- Does the PCA9541APW/01,112 support hot insertion?
- What is the purpose of the bus initialization/recovery function?
The bus initialization/recovery function ensures that the downstream I2C-bus devices are set to an initialized state before switching the channel to the selected master.
- How many address pins does the PCA9541APW/01,112 have?
The component has 4 address pins, allowing up to 16 devices on the I2C-bus.
- What is the role of the interrupt inputs and outputs?
The component has one active LOW interrupt input and two active LOW interrupt outputs to manage and propagate interrupt signals between the masters and the I2C-bus.
- Does the PCA9541APW/01,112 have ESD protection?
- What is the clock frequency range supported by the PCA9541APW/01,112?
The component supports a clock frequency range of 0 Hz to 400 kHz.
- Can the PCA9541APW/01,112 perform voltage level translation?
