Description
Efficient 4‑Channel Bidirectional Logic Level Converter for Raspberry Pi
Designed to bridge the voltage gap between Raspberry Pi’s 3.3 V logic and peripherals that operate at 5 V (or 1.8‑V) levels, this compact converter employs a proven MOSFET‑based bi‑directional level‑shifter topology. The board is powered directly from the Pi’s 3.3 V rail on one side and a selectable external VCC on the other, requiring no additional pull‑up resistors for I²C operation. It maintains signal integrity at high data rates, making it ideal for SPI, UART, and high‑speed general‑purpose I/O.
With a maximum fan‑out of 16 mA per channel and up to 10 MHz line velocity, the unit can safely drive multiple sensors or modules from a single Raspberry Pi pin. It’s small, fully shielded from electrical noise, and compatible with standard 1.8 V–5.5 V logic families, ensuring reliable operation across a wide range of interfacing scenarios.
- Key Spec 1: 4 bi‑directional channels (VCC to 1.8 V–5.5 V; Pi side 1.8 V–3.3 V)
- Key Spec 2: Bidirectional at up to 10 MHz (typical I²C/SPI speed)
- Key Spec 3: Max 16 mA fan‑out per channel, fully protected with series resistors
- Common Use Case: Enabling I²C sensor (e.g., BME680, MPU6050), SPI EEPROM, or UART modules to interface seamlessly with a Raspberry Pi without voltage mismatches
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