I2CIO-8X

Features

• 8 bits of Digital I/O
• I2C interface
• MCP23008P
• Base address = 0x20
  • Address offset jumpers (0-7)
• Interrupt pin on I2C connectors
• I2C Daisy-chain connectors
• GVS (Ground/Voltage/Signal) pins for all 8-bits
• 2.7V to 5.5V
• 49x49mm form factor
• (4) #4-40 mounting holes

Headers/Jumpers

J1, J2 - I2C Connectors

• Daisy-chain connectors
• Can ignore second connector
• Pinout

1. GND
2. Power (3.3V or 5V)
3. SDA
4. SCL
5. Interrupt (Out)

H8, H9 - I2C Terminators

• Install to terminate SDA/SCL with 2.2K terminator

A0-A2 - I2C Address Offset

• Install all three for address = 0x20

Factory Acceptance Test

Test Station Theory of Operations

• Test Station controls the I2C interface on the UUT
• Three tests
  • Internal Test
  • External Loopback Test
  • Bounce an LED Test

Test Station Set-up

• Uses ODAS Test Station V2
• Ribbon cable sets
  • Loopback cable Connector
  • LED-32 cable
• Unit Under Test (UUT)
• Attach Host Computer USB to the Arduino NANO on the Test Station
• Run puTTY on the Host Computer
  • 9600 baud

Card Selection

• puTTY will display the menu

Checking if EEPROM is present on UUT...EEPROM is not present on UUT
Count of I2C devices in range 0x20-0x27 on UUT = 1
Detected MCP23008
Select the board type (Other)
1 - I2CIO8 board
2 - I2CIO8X board
Select board >

• Select 2

Init I2CIO-8X card
C=Card Tests, D=Direct, E=EEPROM, I=access Internal DIGIO32

Running Loopback Card Test

• Use loopback cable
• Select Card Tests = "C"
• Select Run Tests = "T"
• Observe test results

L=Loop/S=Single, T=Test, B=Bounce LEDs, I=UUT Int'l Test, X=eXit sub-menu
Testing UUT = I2CIO-8X
Test PASS = 1, FAIL = 0

• Hit ENTER to display menu

L=Loop/S=Single, T=Test, B=Bounce LEDs, I=UUT Int'l Test, X=eXit sub-menu

Running Internal Tests

• Remove loopback cable
• Select Card Tests = "C"
• Select Run Tests = "I"
• Observe test results

L=Loop/S=Single, T=Test, B=Bounce LEDs, I=UUT Int'l Tests, X=eXit sub-menu
UUT Internal card tests
Test PASS = 2, FAIL = 0

• Hit ENTER to display menu

L=Loop/S=Single, T=Test, B=Bounce LEDs, I=UUT Int'l Test, X=eXit sub-menu

Running Blink LED Test

• Attach LED-32 cable
• Select Card Tests = "C"
• Select Run Tests = "B"
• Observe LEDs scanning on LED-32

L=Loop/S=Single, T=Test, B=Bounce LEDs, I=UUT Int'l Test, X=eXit sub-menu
Bounce a bit across outputs
Bouncing LEDs I2CIO8X - any key to stop

• Hit ENTER to display the menu

Finished bouncing LEDs

Reference

• Arduino Based Test Station
• ODAS Tester Github Repo

Drivers/Example Code

• Github repo - Driver code
• Github repo - Example code

Assembly Sheet

• I2CIO8-X Assembly Sheet