MCP23008 - i2c 8 input/output port expander

PRODUCT ID: 593
$1.95
QTY DISCOUNT
1-9 $1.95
10-99 $1.76
100+ $1.56

Description

Add another 8 pins to your microcontroller using an MCP23008 port expander. The MCP23008 uses two i2c pins (these can be shared with other i2c devices), and in exchange gives you 8 general purpose pins. You can set each of 8 pins to be input, output, or input with a pullup. There's even the ability to get an interrupt via an external pin when any of the inputs change so you don't have to keep polling the chip.

Use this chip from 2.7-5.5V (good for any 3.3V or 5V setup), and you can sink/source up to 20mA from any of the I/O pins so this will work for LEDs and such. Team it up with a high-power MOSFET if you need more juice. DIP package means it will plug into any breadboard or perfboard.

You can set the i2c address by tying the ADDR0-2 pins to power or ground, for up to 8 unique addresses. That means 8 chips can share a single i2c bus - that's 64 I/O pins!

We used this chip in our SPI/i2c backpack and found it to be very reliable and easy to get up and running. We even have an Arduino library with example code written which will set pin state, read and write from individual pins, and set the pullups.

https://www.youtube.com/embed/ouhHKlIrG-I

https://www.youtube.com/embed/EC1X_Jj68Xo

https://www.youtube.com/embed/vxDZktaVE_M?start=566

https://www.youtube.com/embed/rUuwO3Q8N6o?start=566

Technical Details

  • This board/chip uses I2C 7-bit address between 0x20-0x27, selectable with jumpers

Downloads:

Datasheet for MCP23008

RoHS 2 2011 65 EU Compliant
RoHS 2 2015 863 EU Compliant

Learn

Add 8 or 16 extra GPIO pins to your pia via I2C
Use a 16x2 or 20x4 character LCD with a small Linux board!
I2C addresses from 0x00 to 0x7F (inclusive)
How to wire up and use the MCP230xx I2C I/O extender with CircuitPython!