TIDUF34 july   2023

 

  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  DP83TD510E
      2. 2.3.2  AM2434
      3. 2.3.3  TPS2660
      4. 2.3.4  TPS79801-Q1
      5. 2.3.5  MSP430FR2476
      6. 2.3.6  TLV7031
      7. 2.3.7  ATL431
      8. 2.3.8  LM74700-Q1
      9. 2.3.9  TPS62825A
      10. 2.3.10 TPS61023
      11. 2.3.11 TLVM13630
      12. 2.3.12 LSF0108
  9. 3System Design Theory
    1. 3.1 Power Supply
    2. 3.2 PoDL PD and Coupling Network
    3. 3.3 Sitara Technology Module
    4. 3.4 Boot Mode
    5. 3.5 PHI and BoosterPack Headers
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
      1. 4.1.1 Boot Switch Configuration
      2. 4.1.2 Reference Design Start-Up
    2. 4.2 Software Requirements
      1. 4.2.1 PD Firmware
      2. 4.2.2 MCU Firmware
    3. 4.3 Test Setup
    4. 4.4 Test Results
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Author

3.3 Sitara Technology Module


GUID-20230525-SS0I-WNSL-2SRZ-LKWVCCFKQVPM-low.png

Figure 3-7 Sitara™ TQMAX4XXL Board

A system on module (SOM) from TQ is used to simplify the design. The module includes almost everything needed to start the processor. The module is powered by 5 V and generates all necessary voltages internally, so the designer does not need to take care of all the low voltage levels, especially sequencing.

The JTAG interface is used for easy development so software can be loaded to all the cores and the state can be observed. When software development is finished, this header is not used anymore and the software can be stored on an SD card for changing the software easily on the internal eMMC or NOR flash of the modules. Typically, a production device uses these internal memories. For prototyping, an SD card is more practical.

A UART interface is important for debugging and bringup which is implemented with a USB UART interface with an additional isolation in this circuit. It is useful to have the circuit isolated, especially when using the circuit powered over PoDL, to avoid ground loops or to short parts of the rectifier that is part of the PoDL PD circuit.