TCA9517DR

Overview

Category: Integrated Circuit (IC)

Use: Level-Translating I2C Bus Repeater

Characteristics: - Acts as a bidirectional buffer between two I2C buses operating at different voltage levels - Supports I2C bus speeds up to 400 kHz - Provides level shifting and buffering for clock (SCL) and data (SDA) lines - Enables communication between devices with different voltage requirements - Helps extend the range of I2C bus communication

Package: SOIC (Small Outline Integrated Circuit)

Essence: The TCA9517DR is an IC designed to facilitate communication between I2C devices operating at different voltage levels.

Packaging/Quantity: The TCA9517DR is typically sold in reels or tubes containing multiple units. The exact quantity may vary depending on the supplier.

Specifications

• Supply Voltage Range: 1.65V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Input High-Level Voltage (VIH): 0.7 x VDD to VDD + 0.3V
• Input Low-Level Voltage (VIL): -0.3V to 0.3 x VDD
• Output High-Level Voltage (VOH): 0.7 x VDD to VDD + 0.3V
• Output Low-Level Voltage (VOL): -0.3V to 0.3 x VDD
• Maximum Clock Frequency: 400 kHz

Pin Configuration

The TCA9517DR has a total of 8 pins, which are assigned specific functions:

1. VCC: Power supply input
2. GND: Ground reference
3. SDA1: Bidirectional data line for I2C bus 1
4. SCL1: Clock line for I2C bus 1
5. OE: Output enable pin (active low)
6. SDA2: Bidirectional data line for I2C bus 2
7. SCL2: Clock line for I2C bus 2
8. VREF: Reference voltage input for level shifting

Functional Features

• Level translation: The TCA9517DR enables communication between I2C devices operating at different voltage levels by providing bidirectional level shifting.
• Buffering: It acts as a buffer, isolating the two I2C buses and preventing any interference or distortion of signals.
• Bi-directional operation: The IC allows bidirectional data transfer between the two I2C buses, ensuring seamless communication.
• Output enable control: The OE pin can be used to disable the output drivers, allowing the user to disconnect the buses when necessary.

Advantages and Disadvantages

Advantages: - Facilitates communication between I2C devices with different voltage requirements - Supports high-speed I2C bus operation - Provides buffering and isolation between buses - Compact SOIC package for easy integration into designs

Disadvantages: - Requires additional power supply connections for each I2C bus - Limited to I2C bus communication and not suitable for other protocols

Working Principles

The TCA9517DR operates by receiving signals from one I2C bus and translating them to the appropriate voltage level for the other I2C bus. It uses internal circuitry to shift the logic levels of clock and data signals, ensuring compatibility between devices with different voltage requirements. The IC also provides buffering to isolate the two buses and prevent signal distortion.

Application Field Plans

The TCA9517DR finds applications in various scenarios where I2C devices with different voltage levels need to communicate. Some potential application fields include:

1. Mixed-voltage I2C systems: It can be used in systems where devices with different voltage requirements need to communicate over an I2C bus.
2. Industrial automation: The IC can facilitate communication between sensors, actuators, and control units operating at different voltage levels.
3. Consumer electronics: It can be employed in devices such as smartphones, tablets, and smart home appliances that utilize I2C communication.

Alternative Models

1. PCA9306: Similar to the TCA9517DR, this IC provides level shifting for I2C buses but comes in a different package (SOT23).
2. TXB0108: This IC offers bidirectional voltage-level translation for various protocols, including I2C, SPI, and UART.
3. BSS138: While not specifically designed for I2C level shifting, this MOSFET transistor can be used for simple voltage translation applications.

These alternative models offer similar functionality to the TCA9517DR and can be considered based on specific design requirements.

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