DEVICE OVERVIEW

The MCP23017/MCP23S17 (MCP23X17) device family provides 16-bit, general purpose parallel I/O expansion for I2C bus or SPI applications. The two devices differ only in the serial interface:

• MCP23017 – I2C interface

• MCP23S17 – SPI interface

The MCP23X17 consists of multiple 8-bit configuration registers for input, output and polarity selection. The system master can enable the I/Os as either inputs or outputs by writing the I/O configuration bits (IODIRA/B).

The data for each input or output is kept in the corresponding input or output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. All registers can be read by the system master.

Features

• 16-Bit Remote Bidirectional I/O Port:

- I/O pins default to input

• High-Speed I2C Interface (MCP23017):

- 100 kHz

- 400 kHz

- 1.7 MHz

• High-Speed SPI Interface (MCP23S17):

- 10 MHz (maximum)

• Three Hardware Address Pins to Allow Up to Eight Devices On the Bus

• Configurable Interrupt Output Pins:

- Configurable as active-high, active-low or open-drain

• INTA and INTB Can Be Configured to Operate Independently or Together

• Configurable Interrupt Source:

- Interrupt-on-change from configured register defaults or pin changes

• Polarity Inversion Register to Configure the Polarity of the Input Port Data

• External Reset Input

• Low Standby Current: 1 µA (max.)

• Operating Voltage:

- 1.8V to 5.5V @ -40°C to +85°C

- 2.7V to 5.5V @ -40°C to +85°C

- 4.5V to 5.5V @ -40°C to +125°C

MCP23S17属于集成电路（IC） > I/O 扩展器。微芯科技股份有限公司制造生产的MCP23S17I/O 扩展器该系列器件可与微控制器、微处理器或类似器件结合使用，目的是增加可用于连接外设的信号连接数量。典型的工作概念涉及使用串行通信，只需主机设备上的几根 I/O 线，即可读/写扩展器设备上的许多输入/输出引脚的状态。该技术的通信速度不佳，但连通性较高，最适合快速响应不是很关键的应用，例如许多人机界面应用。