PCA9518AD,118

Product Overview

Category

The PCA9518AD,118 belongs to the category of I2C bus repeaters and level shifters.

Use

It is primarily used for extending the range and improving the signal integrity of I2C bus communication.

Characteristics

• Supports bidirectional data transfer between low-voltage and high-voltage I2C buses.
• Provides voltage level shifting and buffering capabilities.
• Enables long-distance communication up to 4000 pF bus capacitance.
• Compatible with both standard-mode (100 kHz) and fast-mode (400 kHz) I2C protocols.

Package

The PCA9518AD,118 is available in a small outline package (SOIC) with eight pins.

Essence

The essence of PCA9518AD,118 lies in its ability to ensure reliable and efficient communication between I2C devices operating at different voltage levels.

Packaging/Quantity

This product is typically packaged in reels or tubes, with a quantity of 2500 units per reel/tube.

Specifications

• Supply voltage: 2.3 V to 5.5 V
• Operating temperature range: -40°C to +85°C
• Maximum data rate: 1 MHz
• Rise/fall time: 20 ns (maximum)
• Quiescent current: 2 µA (maximum)

Pin Configuration

The PCA9518AD,118 has the following pin configuration:

```

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| | --| A0 VCC |-- VCC --| A1 SDA |-- SDA --| A2 SCL |-- SCL --| OE GND |-- GND |___________| ```

Functional Features

• Bidirectional voltage level shifting: Allows communication between I2C buses operating at different voltage levels.
• Automatic direction sensing: Determines the direction of data flow and adjusts the level shifting accordingly.
• Buffering capability: Provides strong output drive for reliable signal transmission.
• Noise filtering: Minimizes the impact of noise on the I2C bus communication.

Advantages

• Enables seamless integration of I2C devices with different voltage requirements.
• Supports high-speed data transfer up to 1 MHz.
• Low quiescent current ensures power efficiency.
• Compact package size allows for space-saving designs.

Disadvantages

• Limited to I2C bus communication and not suitable for other protocols.
• Requires careful consideration of bus capacitance to ensure reliable long-distance communication.

Working Principles

The PCA9518AD,118 operates by monitoring the SDA (data) and SCL (clock) lines of both low-voltage and high-voltage I2C buses. It automatically detects the direction of data flow and adjusts the voltage levels accordingly using a level shifter circuit. The buffered outputs ensure reliable signal transmission between the two buses.

Application Field Plans

The PCA9518AD,118 finds applications in various fields where I2C devices with different voltage requirements need to communicate. Some potential application areas include:

1. Consumer electronics: Facilitating communication between low-voltage microcontrollers and high-voltage sensors or displays.
2. Industrial automation: Enabling connectivity between I2C-based control systems operating at different voltage levels.
3. Automotive electronics: Integrating I2C devices with varying voltage specifications in automotive applications such as infotainment systems and advanced driver-assistance systems.

Alternative Models

For users seeking alternative options, the following models can be considered:

1. PCA9306: Similar functionality with a smaller package size.
2. TCA9517: Offers additional features like hot-swapping and overvoltage protection.
3. BSS138: Basic level shifter for simple bidirectional voltage translation.

These alternative models provide similar functionality to the PCA9518AD,118 and can be suitable replacements depending on specific requirements.

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