Overview
The PCA9545BPW,118, produced by NXP USA Inc., is a four-channel I²C-bus switch with interrupt logic and reset capabilities. This component is part of the PCA9545A/45B/45C family and is designed to manage multiple I²C-bus channels efficiently. The device allows for the fan-out of a single SCL/SDA upstream pair to four downstream pairs, enabling flexible and controlled communication between different devices on the I²C-bus.
The PCA9545BPW,118 is particularly useful in systems where multiple devices share the same I²C-bus, providing a solution for channel selection and interrupt handling. Although the PCA9545BPW,118 is currently listed as obsolete, it remains a significant component in understanding I²C-bus switching and management.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VDD) | 2.3 to 5.5 | V |
| Operating Temperature | -40 to +85 | °C |
| Package Type | 20-TSSOP (0.173, 4.40mm Width) | |
| Number of Channels | 4 | |
| Interface | I²C, SMBus | |
| Interrupt Inputs | 4 (INT0 to INT3) | |
| Interrupt Output | 1 (INT) | |
| Reset Input | Active LOW | |
| Clock Frequency | 0 Hz to 400 kHz | |
| ESD Protection | > 2000 V HBM, > 1000 V CDM | |
| Standby Current | 0.1 to 1 μA | μA |
Key Features
- Bidirectional Translating Switches: Allows for the fan-out of a single SCL/SDA upstream pair to four downstream pairs.
- I²C-Bus Interface Logic: Compatible with SMBus standards.
- Interrupt Logic: Four active LOW interrupt inputs and one active LOW interrupt output.
- Reset Functionality: Active LOW reset input to recover from stuck I²C-bus states.
- Voltage Level Translation: Supports translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses.
- Hot Insertion Support: Allows devices to be connected or disconnected without disrupting the bus.
- Low Standby Current: Minimizes power consumption in standby mode.
- 5 V Tolerant Inputs: Ensures compatibility with 5 V systems.
- ESD and Latch-Up Protection: Exceeds 2000 V HBM and 1000 V CDM for ESD, and 100 mA for latch-up protection.
Applications
- Multidevice I²C-Bus Systems: Ideal for systems where multiple devices share the same I²C-bus, such as in embedded systems, industrial automation, and consumer electronics.
- Voltage Translation: Useful in mixed-voltage systems where devices operate at different voltage levels.
- Interrupt-Driven Systems: Suitable for applications requiring interrupt handling, such as in sensor networks and real-time systems.
- Hot-Swappable Devices: Applicable in environments where devices need to be inserted or removed without disrupting the system operation.
Q & A
- What is the PCA9545BPW,118 used for?
The PCA9545BPW,118 is a four-channel I²C-bus switch used to manage multiple I²C-bus channels, allowing for the fan-out of a single SCL/SDA upstream pair to four downstream pairs.
- What are the key features of the PCA9545BPW,118?
Key features include bidirectional translating switches, I²C-bus interface logic, interrupt logic, reset functionality, voltage level translation, hot insertion support, low standby current, and 5 V tolerant inputs.
- What is the operating voltage range of the PCA9545BPW,118?
The operating voltage range is from 2.3 V to 5.5 V.
- How many interrupt inputs does the PCA9545BPW,118 have?
The device has four active LOW interrupt inputs (INT0 to INT3) and one active LOW interrupt output (INT).
- What is the purpose of the reset input on the PCA9545BPW,118?
The active LOW reset input allows the device to recover from a situation where one of the downstream I²C-buses is stuck in a LOW state.
- Is the PCA9545BPW,118 suitable for hot-swappable applications?
Yes, it supports hot insertion, allowing devices to be connected or disconnected without disrupting the bus.
- What is the standby current of the PCA9545BPW,118?
The standby current is between 0.1 μA and 1 μA.
- Does the PCA9545BPW,118 provide ESD protection?
Yes, it exceeds 2000 V HBM and 1000 V CDM for ESD protection.
- What are the common applications of the PCA9545BPW,118?
Common applications include multidevice I²C-bus systems, voltage translation, interrupt-driven systems, and hot-swappable devices.
- Is the PCA9545BPW,118 currently in production?
No, the PCA9545BPW,118 is listed as obsolete and no longer manufactured.
