Specification: Supports two interface types of access target boards: pin or socket, and supports I2C bus cascade (multiple I2C modules can be used simultaneously through the pin head socket docking method). I2C interface, I/O expansion module, two I/O scalability 8 I/O (up to 8 PCF8574 using expansion to 64 I/O simultaneously). Suitable for multiple platforms including AVR/ARM. Typical application: I/O resource shortage MCU I/O expansion Main resources: PCF8574 I2C interface, 8-bit parallel. Information includes: test procedures (AVR, STM8, C8051F) circuit schematic diagram related PDF data. Provides universal remote I/O expansion through dual wire bidirectional I2C buses (serial clock (SCL), serial data (SDA)). Based on the I2C interface expansion module, I/O can be expanded using I/O (up to 64O using PCF8574 at the same time). An 8-bit input-output (I/O) expander for the 2-wire bidirectional bus (I2C) is designed for 2.5V to 6-V VCC operation.

Suitable for multiple platforms including AVR/ARM. Supports two interface types to access the target board: pin or row seat. Provides universal remote I/O expansion through dual wire bidirectional I2C buses (serial clock (SCL), serial data (SDA)). I2C interface, I/O expansion module, scalability of two I/Os 8 I/Os (up to 8 PCF8574 that can be expanded to 64 I/Os simultaneously). Standard interfaces that can be extended to various development boards.