PCA9518DBQR

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 PCA9518DBQR is a level translator IC specifically designed for I2C bus applications, allowing communication between devices operating at different voltage levels.

Packaging/Quantity: The PCA9518DBQR 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
• Maximum Data Rate: 1 MHz
• Standby Current: 10 µA (typical)
• ESD Protection: ±4 kV HBM, ±500 V CDM

Pin Configuration

The PCA9518DBQR has a total of 20 pins. Below is the detailed pin configuration:

Pin Number | Pin Name | Description -----------|----------|------------ 1 | SDA1 | I2C Bus Data Line 1 2 | SCL1 | I2C Bus Clock Line 1 3 | OE | Output Enable 4 | GND | Ground 5 | SDA2 | I2C Bus Data Line 2 6 | SCL2 | I2C Bus Clock Line 2 7-9 | NC | No Connection 10 | VCC1 | Supply Voltage for Side 1 11-13 | NC | No Connection 14 | VCC2 | Supply Voltage for Side 2 15-20 | NC | No Connection

Functional Features

• Bidirectional voltage level translation between two I2C buses operating at different voltage levels.
• Automatic direction sensing and control of the I2C bus signals.
• Supports I2C Fast Mode Plus (Fm+) with speeds up to 1 MHz.
• Provides ESD protection for reliable operation in harsh environments.
• Low standby current consumption for power efficiency.

Advantages and Disadvantages

Advantages: - Enables communication between devices operating at different voltage levels. - Supports high-speed data transfer up to 1 MHz. - Compatible with both 3.3V and 5V systems. - Provides ESD protection for enhanced reliability. - Low standby current consumption helps conserve power.

Disadvantages: - Limited to I2C bus applications and may not be suitable for other communication protocols. - Requires careful consideration of voltage level compatibility to avoid signal degradation or damage.

Working Principles

The PCA9518DBQR operates by monitoring the voltage levels on both sides of the IC and automatically translating the logic levels of the I2C bus signals accordingly. It uses a bidirectional voltage level shifting technique to ensure proper communication between devices operating at different voltage levels. The IC senses the direction of the I2C bus signals and controls the voltage translation accordingly, allowing seamless data transfer between the two voltage domains.

Detailed Application Field Plans

The PCA9518DBQR 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: The IC can be used in microcontroller-based systems to enable communication between devices operating at different voltage levels, such as sensors, memory modules, and display controllers.

2. Industrial Automation: In industrial automation systems, the PCA9518DBQR can be employed to interface I2C-based sensors, actuators, and control modules that operate at different voltage levels.

3. Consumer Electronics: The IC finds applications in consumer electronic devices where multiple I2C devices with different voltage requirements need to communicate, such as smartphones, tablets, and smart home devices.

4. Automotive Electronics: The PCA9518DBQR can be utilized in automotive electronics systems to facilitate communication between various I2C-based components, including sensors, displays, and control modules, which may operate at different voltage levels.

Detailed and Complete Alternative Models

1. PCA9306: Similar to PCA9518DBQR, this IC provides bidirectional level shifting for I2C bus applications but supports a wider voltage range of 1.2V to 5.5V.

2. TXB0108: This IC is a bidirectional voltage-level translator specifically designed for open-drain applications, including I2C. It supports voltage translation between 1.