DIGIO32-I2C

Features

• 32-bit Digital I/O
  • Two MCP23017 16-bit I2C I/O Expanders
• 24LC024 ODAS Personality EEPROM
  • pid = 6
  • Write Enable jumper protects EEPROM against accidental damage
• I/O Connector is inexpensive/standard DB-37 Female
• 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 Female Pinout

Schematic

• DIGIO32-I2C Schematic

Testing

• There are two card tests
  • Bounce LED test
    • Good for visual verification/debugging
    • Only tests outputs from UUT
  • Card to card test
    • More flexible/faster test
    • Tests both inputs/outputs from/to the card

Cards

• PiPicoMite02 Based Test Station
  • PiPicoMite02 Processor card
  • LED-32
• DB37RIBBON plugged into UUT
• (2) of 2x10 cables to connect between DB37RIBBON and LED-32
  • DB37-1 marked on cable end goes near P1 marked on DB37RIBBON
• LED32-1 marked on cable end goes near HDR1 marked on LED-32
• I2C cable from Arduino Based Test Station to I2C connector on UUT
• Unit Under Test (UUT)
• Check chip pin 1 orientation
• Power test card for shorts

Card Test Procedure

• Power up Test Station/UUT

Program EEPROM

• Some UUTs have Personality EEPROMs
• Run

chdir "/lbcards/ODAS_EEPROM"
load "ODASEEPROM.bas"
run

• If the UUT EEPROM is already programmed, the result is:

Found device at 0x50
Personality EEPROM contents
 Signature = ODAS
 Version = 1
 Rsvd = 0
 NumAtoms = 2
 eeplen = 96
 uuid = 0000000000000000
 Product ID = 6 (DIGIO32-I2C)
 vslen = 32
 pslen = 32
 Vendor String = LAND-BOARDS.COM
 Product String = DIGIO32-I2C
Re-write (Y/N)?

Bounce LED Test

• Cable DB-37 to LED-32 card
• Type

chdir "/lbcards/GPIO32"
load "DIGIO32I2C-01.bas"
run

• Should see the LEDs go around the LED-32 card
• Hit any key to stop (after finishing rotation)

Card-to-Card Test

• Can be used in place of the Bounce LED test
• (2) DB37RIBBON cards
• Cables to connect two DB37RIBBON cards
• Type C to select card test
• Type T to test the card
• puTTY will display test pass/fail
• Can set L for loop test then T to run test
• Mark bottom TEST block on bottom of card

Code Header

  //////////////////////////////////////////////////////////////////////////////////////
  // 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.
  //////////////////////////////////////////////////////////////////////////////////////

Drivers

• GitHub repo for the DigIO32-I2C Card Arduino Driver
  • Importing an Arduino ZIP library
• GitHub repo for the DigIO32-I2C Card Arduino examples

Assembly Sheet

• DIGIO32-I2C Assembly Sheet