Overview
The PCA9541APW/03,118 is a 2-to-1 I²C-bus master selector designed by NXP USA Inc. for high reliability dual master I²C-bus applications. This component ensures system operation even when one master fails or the controller card is removed for maintenance. It allows two masters, such as a primary and a backup, to be connected to the same downstream I²C-bus slave devices, enabling either master to gain control of the slave devices if the other master is disabled or removed.
Key Specifications
| Specification | Details |
|---|---|
| Package | 16-TSSOP (0.173, 4.40mm Width) |
| Pin Count | 16 |
| Interface | I²C, SMBus |
| Voltage - Supply | 2.3V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| ROHS Status | ROHS3 Compliant |
| Clock Frequency | 400kHz |
| Interrupt Output | Yes |
| Current - Output Source/Sink | 10mA / 25mA |
Key Features
- 2-to-1 bidirectional master selector
- I²C-bus interface logic; compatible with SMBus standards
- Active LOW reset input and Power-On Reset (POR) function
- Active LOW interrupt input and 2 active LOW interrupt outputs
- Channel selection via I²C-bus
- Bus initialization/recovery function and bus traffic sensor
- Low Ron switches allowing voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses
- No glitch on power-up
Applications
The PCA9541APW/03,118 is suitable for various applications requiring reliable dual master I²C-bus control, such as in industrial automation, medical devices, automotive systems, and any scenario where redundant control is necessary for system reliability.
Q & A
- What is the primary function of the PCA9541APW/03,118?
The primary function is to act as a 2-to-1 I²C-bus master selector, allowing two masters to control the same downstream I²C-bus slave devices. - What are the operating voltage ranges for this component?
The operating voltage ranges from 2.3V to 5.5V. - What is the package type of the PCA9541APW/03,118?
The package type is 16-TSSOP (0.173, 4.40mm Width). - Does the PCA9541APW/03,118 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 purpose of the interrupt outputs on the PCA9541APW/03,118?
The interrupt outputs provide an indication of which master has control of the bus and can signal bus initialization or recovery needs. - How does the PCA9541APW/03,118 handle a failed master?
The failed master is isolated from the system, and the other master can take control of the slave devices without interruption. - What is the clock frequency supported by the PCA9541APW/03,118?
The clock frequency is up to 400kHz. - Is the PCA9541APW/03,118 ROHS compliant?
Yes, it is ROHS3 compliant. - What is the operating temperature range of the PCA9541APW/03,118?
The operating temperature range is from -40°C to 85°C. - Does the PCA9541APW/03,118 have a Power-On Reset (POR) function?
Yes, it has an active LOW reset input and a Power-On Reset (POR) function.
