Overview
The PCA9518PW,118 is a BiCMOS integrated circuit designed by NXP USA Inc. for use in I²C-bus and SMBus systems. This component retains all the operating modes and features of the I²C-bus system while enabling the extension of the I²C-bus by buffering both the data (SDA) and the clock (SCL) lines. This allows for the division of the bus into multiple segments, each capable of supporting up to 400 pF of capacitance, thereby increasing the number of devices and the length of the bus.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC supply voltage | VCC to GND | -0.5 | 7 | V | |
| I2C-bus voltage (SCL or SDA) | -0.5 | 7 | V | ||
| Input current (any pin) | 50 | mA | |||
| Total power dissipation | 300 | mW | |||
| Storage temperature | -55 | 125 | °C | ||
| Ambient temperature (operating) | -40 | 85 | °C | ||
| Operating voltage range | 2.3 | 3.6 | V |
Key Features
- Expandable 5-channel I²C-bus hub: Allows for the creation of a hub with any width in multiples of five using expansion pins.
- Buffering of SDA and SCL lines: Enables the extension of the I²C-bus, allowing for an unlimited number of segments with each segment seeing only one repeater delay.
- Multiple master capability: Each segment can have multiple masters, enhancing the flexibility of the I²C-bus system.
- Wide voltage range: Operates within a voltage range of 2.3 V to 3.6 V, making it versatile for different system requirements.
- Partial power-down performance: Improves performance during partial power-down scenarios, maintaining I²C-bus functionality).
- 5 V tolerant: Does not require additional circuitry to translate between different bus voltages, simplifying system design).
Applications
The PCA9518PW,118 is suitable for various applications involving I²C-bus and SMBus systems. It is particularly useful in scenarios where the I²C-bus needs to be extended or segmented to accommodate a large number of devices or to increase the bus length. Typical applications include:
- Embedded systems: Where multiple devices need to communicate over the I²C-bus.
- Industrial automation: For controlling and monitoring various devices in an industrial setting.
- Consumer electronics: In devices such as TVs, set-top boxes, and other consumer electronics that use I²C-bus for communication.
- Automotive systems: For vehicle control and monitoring systems that utilize I²C-bus communication.
Q & A
- What is the PCA9518PW,118 used for?
The PCA9518PW,118 is used to extend and segment I²C-bus and SMBus systems, allowing for more devices and longer bus lengths.
- What is the operating voltage range of the PCA9518PW,118?
The operating voltage range is from 2.3 V to 3.6 V.
- Can the PCA9518PW,118 handle multiple masters on each segment?
- What is the maximum capacitance allowed per segment?
Each segment can support up to 400 pF of capacitance.
- Is the PCA9518PW,118 5 V tolerant?
- What are the typical applications of the PCA9518PW,118?
Typical applications include embedded systems, industrial automation, consumer electronics, and automotive systems.
- How does the PCA9518PW,118 improve partial power-down performance?
- Can the PCA9518PW,118 be used in high-temperature environments?
- What is the maximum total power dissipation of the PCA9518PW,118?
- How many channels does the PCA9518PW,118 support?
