DIGIO32-I2C

Features

• 32-bit Digital I/O
  • Two MCP23017 16-bit I2C I/O Expanders
• EEPROM for board ID and application specific information
  • Write Enable jumper protects EEPROM against accidental damage
• I/O Connector is inexpensive/standard DB-37
• I2C Interface
  • Daisy-chain I2C connector
  • I2C Termination jumpers for end of I2C chain
  • I2C Address select jumper (2 addresses - can support up to 4 cards)
• Power Options
  • Supports 3.3V or 5V signal levels
  • Fuse protected power output on DB-37
• Power connector (not required for minimal loads
• ODAS form factor (width is 95 mm)
• 6-32 Mounting holes

Connectors

DB-37 Pinout

Schematic

• DIGIO32-I2C Schematic

Drivers

• GitHub repo for the DigIO32-I2C Card Arduino Driver
• GitHub repo for the DigIO32-I2C Card Arduino examples

Testing

• Arduino Based Test Station

  //////////////////////////////////////////////////////////////////////////////////////
  // uint8_t testDigio32Card() - Test the DIGIO32 card.
  // The Test Station and the UUT both are DIGIO32 cards.
  // Cable from UUT DB-37 connector to the DIGIO32 card DB-37 in the Test Station.
  // The DIGIO32 internal to the Test Station is set to all inputs with pull-ups.
  // The DIGIO32 that is the UUT is set up to all outputs.
  //////////////////////////////////////////////////////////////////////////////////////

Assembly Sheet

• DIGIO32-I2C Assembly Sheet