PCA9518DW

Product Overview

Category: Integrated Circuit (IC)

Use: Level shifting and voltage translation between different logic levels in I2C bus systems.

Characteristics: - Bidirectional voltage level shifting - Supports I2C Fast Mode and Standard Mode - Compatible with 2.5V, 3.3V, and 5V systems - Low standby current consumption - ESD protection for robust operation

Package: SOIC (Small Outline Integrated Circuit)

Essence: The PCA9518DW is a level shifter IC specifically designed for I2C bus systems, allowing communication between devices operating at different voltage levels.

Packaging/Quantity: The PCA9518DW is available in a SOIC package and is typically sold in reels of 2500 units.

Specifications

• Supply Voltage Range: 2.3V to 5.5V
• Logic Voltage Levels: 1.65V to 5.5V
• Maximum Data Rate: 400 kbit/s
• Standby Current: 10 µA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The PCA9518DW has a total of 16 pins. Here is the detailed pin configuration:

1. SDA1: Input/output for I2C bus 1 data line.
2. SCL1: Input for I2C bus 1 clock line.
3. OE1: Output enable for I2C bus 1.
4. GND: Ground reference.
5. VCC: Positive supply voltage.
6. SDA2: Input/output for I2C bus 2 data line.
7. SCL2: Input for I2C bus 2 clock line.
8. OE2: Output enable for I2C bus 2.
9. NC: No connection.
10. NC: No connection.
11. NC: No connection.
12. NC: No connection.
13. NC: No connection.
14. NC: No connection.
15. NC: No connection.
16. NC: No connection.

Functional Features

• Bidirectional voltage level shifting between two I2C buses operating at different logic levels.
• Automatic direction sensing and control for seamless communication.
• Supports I2C Fast Mode (400 kbit/s) and Standard Mode (100 kbit/s).
• Low standby current consumption for power-efficient operation.
• ESD protection on all pins for enhanced reliability.

Advantages and Disadvantages

Advantages: - Enables communication between devices with different voltage levels in I2C bus systems. - Wide supply voltage range compatibility. - Supports high-speed data transfer in Fast Mode. - Low standby current consumption for power-sensitive applications. - Robust ESD protection for reliable operation.

Disadvantages: - Limited to I2C bus applications and may not be suitable for other communication protocols. - Requires careful consideration of voltage level compatibility between connected devices.

Working Principles

The PCA9518DW acts as a bidirectional voltage level shifter for I2C bus systems. It automatically senses the direction of data flow and adjusts the voltage levels accordingly. When a device on one I2C bus wants to communicate with a device on another I2C bus operating at a different voltage level, the PCA9518DW ensures proper translation of logic levels, allowing seamless communication between the two devices.

Detailed Application Field Plans

The PCA9518DW finds application in various scenarios where voltage level translation is required in I2C bus systems. Some common application fields include:

1. Mixed-voltage I2C communication between microcontrollers and sensors.
2. Interfacing between different generations of I2C devices with varying voltage requirements.
3. Integration of I2C peripherals operating at different voltage levels in embedded systems.
4. Level shifting in I2C-based communication between modules or subsystems within a larger system.

Detailed and Complete Alternative Models

1. PCA9306: Dual bidirectional I2C-bus and SMBus voltage-level translator.
2. TXB0108: 8-bit bidirectional voltage-level translator with automatic direction sensing.
3. BSS138: N-channel logic level enhancement mode field-effect transistor (FET) for level shifting applications.
4. SN74LVC1T45: Single-bit dual-supply bus transceiver with configurable voltage translation.

These alternative models offer similar functionality to the PCA9518DW and can be considered as alternatives based on specific application requirements.

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