I2C-RPT-08

Features

• I2C Hub / Repeater / Replicator / Multiplexer / De-multiplexer
  • PCA9548A
  • Eight I2C Ports
  • 100KHz/400KHz operation
• Host port
  • Controlled via I2C
  • 3.3V or 5V host operation
• 3.3V or 5V slave ports operation
• Voltage translation between the ports
• Ex: a Raspberry PI which runs 3.3V can control I2C devices which run at 5V
• On-board termination resistors
• 49x49mm form factor
• 4 solid 4-40 mounting holes

Drivers/Example Code

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

Programming Note

• The mux chip allows multiple or single I2C ports to be written at the same time
  • To only enable one port at a time make sure you disable a channel after use or disable last channel used before enabling new channel

Testing

• Arduino Based Test Station
  • 9600 baud, no hardware handshake
• Uses 8x of I2CIO-8 cards
• On UUT
  • Install jumpers into A0-A2
    • I2C address offset = 0x0
    • BLUE-PILL-HUB is set to offset=0x1 so it does not conflict
• Connect directly to I2C port on the BLUE-PILL-HUB
• ODAS Tester Github Repo

Issues

• Silkscreen shows SCK, should be SCL

Assembly Sheet

• I2C-RPT-08 Assembly Sheet