MCP23S18屬于集成電路（IC）的I/O擴展器。由美國微芯科技公司制造生產(chǎn)的MCP23S18I/O 擴展器該系列器件可與微控制器、微處理器或類似器件結(jié)合使用，目的是增加可用于連接外設的信號連接數(shù)量。典型的工作概念涉及使用串行通信，只需主機設備上的幾根 I/O 線，即可讀/寫擴展器設備上的許多輸入/輸出引腳的狀態(tài)。該技術(shù)的通信速度不佳，但連通性較高，最適合快速響應不是很關鍵的應用，例如許多人機界面應用。

The MCP23X18 device provides 16-bit, general purpose parallel I/O expansion for I2C bus or SPI applications. The two devices differ only in the serial interface.

? MCP23018 - I2C interface

? MCP23S18 - SPI interface

The MCP23X18 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. 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.

特性 Features

? 16-bit remote bidirectional I/O port:

- I/O pins default to input

? Open-drain outputs:

- 5.5V tolerant

- 25 mA sink capable (per pin)

- 400 mA total

? High-speed I2C? interface: (MCP23018)

- 100 kHz

- 400 kHz

- 3.4 MHz

? High-speed SPI interface: (MCP23S18)

- 10 MHz: 2.7V ≤ VDD ≤ 5.5V

? Single hardware address pin: (MCP23018)

- Voltage input to allow up to eight devices on the bus

? Configurable interrupt output pins:

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

? Configurable interrupt source:

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

? Polarity inversion register to configure the polarity

of the input port data

? External reset input

? Low standby current:

- 1 μA (-40°C ≤ TA ≤ +85°C)

- 6 μA (+85°C ≤ TA ≤ +125°C)

? Operating voltage:

- 1.8V to 5.5V