Difference between revisions of "I2C-RPT-08"

Revision as of 13:08, 1 August 2020

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

Arduino Based Test Station
Connects directly to I2C port on the Blue Pill Hub
- I2C address offset = 0x0
- Blue Pill Hub is set to offset=0x1 so it does not conflict
- Uses 8x of I2CIO-8 cards
ODAS Tester Github Repo

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

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

@@ Line 34: / Line 34: @@
 * [https://github.com/land-boards/lb-Arduino-Code/tree/master/libraries/LandBoards_I2CRPT08 Github repo] - Driver code
 * [https://github.com/land-boards/lb-Arduino-Code/tree/master/LBCards/I2CRPT08 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 ==