What is the I2C Logic Level Converter?
The SHILLEHTEK IIC I2C Logic Level Converter is a compact, pre-soldered bi-directional voltage level shifter designed to safely step signals between 3.3V and 5V devices. Ideal for use with Raspberry Pi, Arduino, ESP32, and other microcontrollers, this 4-channel converter allows different logic-level devices to communicate seamlessly over I2C or other digital lines. Whether you're working with sensors, displays, or communication modules, this module ensures compatibility and prevents damage to sensitive components.
Operating Mechanisms of the Logic Level Converter
The logic level converter uses MOSFET-based circuitry to allow safe, bi-directional communication between 3.3V and 5V logic systems. Here's how it works:
- Bi-Directional Conversion: Each of the 4 channels automatically converts signals in both directions, allowing seamless data flow between mixed-voltage systems.
- Dual Voltage Supply: The module takes two power inputs—one for the high-voltage (5V) side and one for the low-voltage (3.3V) side—to define logic levels.
- Safe Communication: Prevents high-voltage logic from damaging 3.3V-only devices by shifting voltage levels appropriately.
- Pre-Soldered Pins: Comes with header pins already attached for immediate use in breadboards and development boards.
This module is perfect for I2C, SPI, UART, or any digital signal where voltage mismatch could pose a problem.
Pins
Logic Level Converter Pinout
HV (High Voltage Input)
Connect this to your 5V logic level power source (e.g., from Arduino).
LV (Low Voltage Input)
Connect this to your 3.3V logic level power source (e.g., from Raspberry Pi).
GND (Ground)
Common ground shared by both HV and LV systems. Must be connected to both microcontrollers' grounds.
TX1–TX4 (High Voltage Side)
These are the high-voltage I/O lines. Connect to the 5V device or bus.
RX1–RX4 (Low Voltage Side)
These are the corresponding low-voltage I/O lines. Connect to the 3.3V device or bus.
Technical Specifications
| Specification | Details |
|---|---|
| Channels | 4 Bi-Directional |
| Voltage Range | 1.8V–6V |
| Recommended Use | I2C, SPI, UART, GPIO logic-level matching |
| Compatibility | Arduino, Raspberry Pi, ESP32, ESP8266, STM32, and more |
| Form Factor | Breadboard-friendly, pre-soldered headers |
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