MCP23017 I2C GPIO 포트 확장 모듈
(Adafruit MCP23017 I2C GPIO Expander Breakout
- STEMMA QT / Qwiic)
개요
- 본 제품은 MCP23017 I2C GPIO 포트 확장 모듈 입니다.
- MCP23017칩을 기반으로 디자인된 제품으로 I2C 인터페이스를 이용하여 16개의 GPIO를 확장할 수 있게 하여 주는 제품입니다.
- 3V/5V 로직과 전원에서 사용이 가능하며, 각 GPIO는 최대 25mA까지 동작이 가능합니다.
- 두개의 IRQ 핀이 있어서 I2C 버스 폴링이 필요 없습니다.
- 모듈은 3개의 주소설정 핀이 있어 하나의 I2C 버스에 8개의 모듈을 연결할 수 있어 총 8x16 =128개의 GPIO 사용이 가능합니다.
특징
- Product Dimensions: 43.0mm x 18.0mm x 5.0mm / 1.7" x 0.7" x 0.2"
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We've gotten a lot of requests for a MCP23017 breakout and we've always sorta been like "ehh why not just use the DIP chip?" but with STEMMA QT we could see the use case for a plug and play version that comes with all the passives on board. This Adafruit MCP23017 I2C GPIO Expander Breakout has 16 GPIO with matching ground pad.
We particularly like the '17 as an expander for it's simple no-nonsense capability. It runs happily from 3V or 5V logic and power. Each GPIO can be an output driving up to 25mA, so LEDs are no problem. Or, each can be an input, with optional pullup. There are two IRQ pins that are configurable for what inputs to keep track of so no I2C bus polling is required. With 3 address pins, you can have up to 8 on a single bus for a total of 8 x 16 = 128 GPIO all on one I2C bus!
We've got solid Arduino and CircuitPython libraries with examples, all ready for this chip. But even if you are using some other platform, the MCP23017 is so classic, you'll likely be able to find example code.
Comes with two sticks of header so you can use it in a breadboard, with some soldering. You can also free-wire buttons by connecting one side to the GPIO (set as input with pullup) and the other side to a ground pad.
To get you going fast, we spun up a custom-made PCB in the STEMMA QT form factor, making it easy to interface with. The STEMMA QT connectors on either side are compatible with the SparkFun Qwiic I2C connectors. This allows you to make solderless connections between your development board and the MCP23017 or to chain it with a wide range of other sensors and accessories using a compatible cable.
QT Cable is not included, but we have a variety in the shop.
