The PCA9548A module enables a single I²C master to communicate with up to eight downstream I²C buses. Each channel can host devices with identical addresses, making this module ideal for sensor arrays, multi-display systems, and modular I²C expansion where address duplication is unavoidable.

Specifications

• Chipset: PCA9548A
• Interface: I²C (SDA/SCL)
• Operating Voltage: 2.3 V to 5.5 V
• Logic Level Compatibility: 3.3 V and 5 V systems
• I²C Address Range: 0x70 to 0x77 (configurable via A0–A2 pins)
• Max Clock Frequency: 400 kHz
• Channels: 8 independent I²C buses
• Reset Pin: Active-low input for software reset

Features

• Allows communication with multiple I²C devices sharing the same address
• Supports up to 8 downstream I²C channels
• Configurable I²C address via hardware jumpers (A0, A1, A2)
• Breadboard-friendly breakout with pull-up resistors and decoupling capacitors
• Compatible with Arduino, ESP32, Raspberry Pi, STM32, and other I²C hosts
• Ideal for sensor arrays, multi-display setups, and modular I²C expansion
• Supports cascading multiple modules for up to 64 devices on one bus