TIDUFF0 December   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 AWR2188
      2. 2.3.2 DS90UB971S-Q1
      3. 2.3.3 MSPM0G3519-Q1
      4. 2.3.4 LM68635-Q1
      5. 2.3.5 LP8772x-Q1
      6. 2.3.6 TPS6285018A-Q1
      7. 2.3.7 CDC6C025000-Q1
  9. 3System Design Theory
    1. 3.1 Diagnostic and Monitoring Features
    2. 3.2 Power over Coax (PoC) Network
    3. 3.3 SPI and I2C Communication Interface
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
    2. 4.2 Software Requirements
    3. 4.3 Test Setup
      1. 4.3.1 Precautions
      2. 4.3.2 Data Capturing Approach
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
      3. 5.1.3 PCB Layout Recommendations
        1. 5.1.3.1 Launch on Package (LOP Antenna)
        2. 5.1.3.2 Power over Coax (PoC)
        3. 5.1.3.3 PCB Layer Stackup
        4. 5.1.3.4 Board Photos
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
      1. 5.5.1 About the Author
  12. 6About the Author

3.3 SPI and I2C Communication Interface

The AWR2188, DS90UB971S-Q1 as well as MSPM0G3519-Q1 supports I2C as well as SPI communication. The board also supports both interfaces. By default, I2C is enabled to communicate between the DS90UB971S-Q1 and MSPM0G3519-Q1. The MSPM0G3519-Q1 communicates through SPI to the AWR2188 and through I2C to the PMIC.

The connection scheme can be modified to connect the DS90UB971S-Q1 through SPI to the AWR2188 directly and communicate through I2C to the PMIC. This way the MSPM0G3519-Q1 can be bypassed in case the MCU is not required. Complete the following to implement this change:

  • Populate R36, R61, R62, R63, R64, R69, R70, R127
  • Remove R82, R83, R84, R85, R86, R90, R91
TIDA-020093 Schematic of SPI and I2C Connection Figure 3-2 Schematic of SPI and I2C Connection