DIGIO-128

Features

• (8) of MCP23017 - 16 bit GPIO x 8
  • Total of 128 bits of GPIO
• I2C host interface
  • MCP23017] I2C Parallel I/O
  • Two Wire interface
  • 100/400 KHZ operation
  • 25mA sink/source capability per I/O
  • Jumper selectable terminators
  • Single 4-pin host interface connector (Ground, Power, Clock, Data)
• 0.1" Pitch I/O Connectors
  • 16 digital I/O
  • 2 Power
  • 2 Ground
  • Interrupt connectors
  • I2C Connector
  • Power Connector
• 24LC024 Personality EEPROM
• 3.3V or 5V operation
• Compatible with Arduino, Raspberry Pi, BeagleBone Black
• 95x95mm form factor
• (4) 6-32 mounting holes - one on each corner

I2C Addresses

• MCP23017 parts 0x20 - 0x27
• EEPROM 24LC024 = 0x50

Software Examples/Drivers

• DIGIO-128 Arduino example code
• DIGIO-128 Arduino Driver
• DIGIO-128 - 64-bit version Arduino Driver
• DIGIO-128 Micropython Driver (ESP-32)
• Raspberry Pi Example Code - Requires some knowledge of the MCP23017 (datasheet)

Connectors

P1-P4, P6-P9 - Digital I/O Connector

• 16 bits per connector
• 2 Power
• 2 Ground

P5, P10 - Interrupt Outputs

• Useful for detecting input changes or levels
• Can be ignored

J2, J3 - I2C Connectors

• Daisy chained connections
• 2nd connector can be ignored
• Card can be powered through this connector(s)

J4 - Terminators

• SDA, SCL I2C Terminators
  • Install jumper to use terminators
• WE - EEPROM Write Enable
  • Install To enable writing config EEPROM

Schematics

• Rev X3 schematic
• Rev X4 schematic

Testing

• Arduino Based Test Station
• ODAS Tester Github Repo

Assembly Sheet

• DIGIO-128 Rev X4 Assembly Sheet
• DIGIO-128 Rev X3 Assembly Sheet