PCA9518DBR

Product Overview

Category: Integrated Circuit (IC)

Use: Level shifting and translating between different voltage levels in I2C bus applications.

Characteristics: - Bidirectional voltage level translation - Supports I2C Fast Mode Plus (Fm+) with speeds up to 1 MHz - Compatible with both 3.3V and 5V systems - Low standby current consumption - ESD protection for robust operation

Package: SSOP (Shrink Small Outline Package)

Essence: The PCA9518DBR is a level translator IC designed specifically for I2C bus applications, allowing communication between devices operating at different voltage levels.

Packaging/Quantity: The PCA9518DBR is available in tape and reel packaging, with 2500 units per reel.

Specifications

• Supply Voltage Range: 2.3V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Standby Current: 10µA (typical)
• Maximum Data Rate: 1 MHz
• Number of Channels: 8

Pin Configuration

The PCA9518DBR has a total of 20 pins. The pin configuration is as follows:

Pin 1: SDA0 Pin 2: SCL0 Pin 3: OE Pin 4: GND Pin 5: VCC Pin 6: SDA1 Pin 7: SCL1 Pin 8: SDA2 Pin 9: SCL2 Pin 10: SDA3 Pin 11: SCL3 Pin 12: SDA4 Pin 13: SCL4 Pin 14: SDA5 Pin 15: SCL5 Pin 16: SDA6 Pin 17: SCL6 Pin 18: SDA7 Pin 19: SCL7 Pin 20: VREF

Functional Features

• Bidirectional voltage level translation between two I2C buses operating at different voltage levels.
• Automatic direction sensing and control for each channel.
• Supports multiple channels, allowing simultaneous translation of up to 8 I2C buses.
• Provides ESD protection for reliable operation in harsh environments.

Advantages and Disadvantages

Advantages: - Enables seamless communication between devices with different voltage levels. - Supports high-speed data transfer up to 1 MHz. - Low standby current consumption helps conserve power. - Robust ESD protection ensures reliable operation.

Disadvantages: - Limited to I2C bus applications and may not be suitable for other communication protocols. - Requires careful consideration of voltage compatibility to avoid potential issues.

Working Principles

The PCA9518DBR operates by monitoring the voltage levels on the input I2C buses and automatically translating them to the appropriate levels on the output buses. It uses a combination of level shifting circuitry and bidirectional voltage translators to ensure accurate and reliable data transfer between devices.

Detailed Application Field Plans

The PCA9518DBR is commonly used in various applications where there is a need to interface I2C devices operating at different voltage levels. Some typical application fields include:

1. Embedded Systems: Allows communication between microcontrollers and peripheral devices operating at different voltage levels.
2. Industrial Automation: Facilitates communication between sensors, actuators, and control systems with varying voltage requirements.
3. Consumer Electronics: Enables interoperability between devices such as smartphones, tablets, and accessories that operate at different voltage levels.
4. Automotive Electronics: Used in automotive systems to connect components with different voltage specifications, such as infotainment systems and vehicle control modules.

Detailed and Complete Alternative Models

1. PCA9306: Similar to PCA9518DBR, but with fewer channels (2) and lower data rate (400 kHz).
2. TXB0108: Provides bidirectional level shifting for various communication protocols, including I2C, SPI, and UART.
3. BSS138: MOSFET-based level shifter suitable for low-voltage applications.

These alternative models offer similar functionality to the PCA9518DBR and can be considered based on specific application requirements.

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