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描述
描述
Gravity:MCP23017 IIC 16位元數位IO擴展模組 基於MCP23017晶片的IO口擴展模組,最多可擴展128個IO口,適用于機器人、互動媒體等專案
這是一款基於MCP23017晶片的IO擴展模組,該模組可以為您的微控制器額外添加16個IO口。擴展板可設置8個IIC位址,這意味著一塊主控上最多能級聯8個模組,最多可擴展128個IO口。該擴展板解決了機器人、互動媒體等專案IO口不夠的問題。IO擴展板有2組IO引腳,分別為GPIOA和GPIOB,每組有8位獨立IO口,且每個IO口可被獨立設置為輸入、輸出、上拉輸入(內部接100KΩ上拉電阻)、中斷等模式。此外,該模組還有2個中斷信號引腳IA和IB,其中IA用於檢測GPIOA組的IO口是否發生中斷,IB用於檢測GPIOB組的IO口是否發生中斷,當GPIOA或GPIOB中某個引腳發生中斷,則相應的IA或IB引腳會產生一個高電平信號。
技術規格
-
介面供電電壓:3V-5.5V
- IIC地址:0x20~0x27
- Digital I/O 數位輸入/輸出端: PA0~PA7,PB0~PB7
- IO口驅動電流: 20mA
- 中斷信號引腳:IA、IB
- 產品尺寸:44*32mm
引腳說明

引腳說明 | ||
標號 | 名稱 | 功能描述 |
1 | +/VCC | 電源正極 |
2 | -/GND | 電源負極 |
3 | C | IIC時鐘線 |
4 | D | IIC數據線 |
5 | RST | 復位引腳 |
6 | IA | GPIOA中斷檢測引腳 |
5 | IB | GPIOB中斷檢測引腳 |
6 | PWR | 電源指示燈 |
7 | A0/A1/A2 | IIC位址切換開關 |
數字IO口簡介表 | ||||||||
組別 | 引腳編號 | |||||||
GPIOA | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
PA0 | PA1 | PA2 | PA3 | PA4 | PA5 | PA6 | PA7 | |
GPIOB | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
PB0 | PB1 | PB2 | PB3 | PB4 | PB5 | PB6 | PB7 |
上表中的每個數位引腳,都可被設置為輸入、輸出、上拉輸入、中斷等引腳模式。
技術文件與範例
Gravity: MCP23017 I2C 16 Digital IO Expansion Module
This is an IO expansion module that based on the chip MCP23017. The module can expand additional 16 IOs. It can set 8 I2C addresses, which means with this module, the microcontroller can connect 8 modules, and expand 128 IOs at most. The module solves insufficient IO ports problem in applications like robots and interactive medias.This Gravity: MCP23017 I2C IO 16 digital IO expansion module has 2 groups of IO pins, GPIOA and GPIOB. Each group has 8 independent IO interfaces, and each IO interface can be set to input, output, pull-up input (connect to 100KΩ pull-up resistor), interrupt and so on.
Besides, the module has 2 interrupt signal pins: IA and IB. IA is used to detect the interruption in IO interfaces of GPIOA, and IB is used to detect the interruption in IO interfaces of GPIOB. When one pin of GPIOA or GPIOB interrupts, the corresponding IA or IB will produce a high-level signal.
FEATURES
- Supporting to expand 128 IOs at most
- Multiple IO mode
- Changeable I2C address by dial switch
- Multiple VCC and GND pins leaded
- Compatible with both 3.3V and 5V
Scenarios
- Robots
- Interactive medias
- Light cube
SPECIFICATION
- Operating Voltage: 3.3V~5.5V
- I2C Address: 0x20~0x27
- Digital Input/Output: 20Ma
- Signal Interrupt Pin: IA, IB
- Dimension: 44x32mm / 1.73×1.26inch
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