The PCA9306 level conversion module is a bidirectional voltage converter designed for I²C/SMBus applications. It connects devices operating at different voltage levels, ranging from 1.2V to 5V, such as 3.3V microcontrollers (e.g., STM32, ESP8266, Raspberry Pi) and 5V sensors (e.g., OLED, BMP180, MPU6050). It features the Texas Instruments PCA9306 chip, supports up to 400kHz I²C Fast Mode communication, requires no direction control, and enables plug-and-play operation. Bidirectional conversion: Supports any voltage combination between 1.2V and 5V (e.g., 3.3V ↔ 5V, 1.8V ↔ 3.3V), enabling reliable data transmission across differing logic levels. Easy integration: Includes a compact PCB breakout board with straight pin headers for convenient breadboard or jumper wire connections. High compatibility: Designed for seamless I²C communication between devices with mismatched voltage levels. Dual-channel configuration handles both SCL (clock) and SDA (data) lines simultaneously. Wide application: Enables automatic bidirectional level shifting without external control signals or manual direction management. Chip model: PCA9306DCUR (Texas Instruments) Input voltage range: 1.2V to 5V (VREF1 ≤ VREF2) Maximum frequency: 400kHz Conversion direction: Bidirectional, automatic Interface type: I²C (SCL and SDA) Operating temperature: –40°C to +85°C Pin definitions: VREF1 — Low-voltage side power supply (e.g., 3.3V) SCL1 — Low-voltage side I²C clock line SDA1 — Low-voltage side I²C data line GND — Ground SDA2 — High-voltage side I²C data line SCL2 — High-voltage side I²C clock line