SDAA280 March   2026 MSPM0G5187

 

  1.   1
  2.   Abstract
  3. 1USB Makes a Complex System Appear Simple
    1. 1.1 Why Has USB Been so Successful?
    2. 1.2 Why Does USB Look Simple?
  4. 2MSPM0 USB Silicon
    1. 2.1 How MSPM0 Devices are Documented
    2. 2.2 MSPM0 USB Module
  5. 3MSPM0 USB Hardware Design
    1. 3.1 Block Diagram
    2. 3.2 USB Mode of Operation
      1. 3.2.1 USB Device Mode: Bus Powered
      2. 3.2.2 USB Device Mode: Self-Powered
      3. 3.2.3 USB Host Mode Power Considerations
      4. 3.2.4 ESD Considerations
      5. 3.2.5 Layout Considerations
    3. 3.3 USB Clock Implementation
      1. 3.3.1 Selecting a Clock Source
      2. 3.3.2 Selecting a Clock Frequency
    4. 3.4 Example Implementation
  6. 4Software Overview
    1. 4.1 USB Stacks: Features
    2. 4.2 SysConfig Descriptor Tool
    3. 4.3 Selecting a Device Class
      1. 4.3.1 Example Process for Deciding on a USB Device Class
    4. 4.4 How to Select a Vendor ID (VID) and Product ID (PID)
      1. 4.4.1 Choosing and Obtaining VID and PID
      2. 4.4.2 Using VIDs and PIDs During Development
    5. 4.5 TinyUSB API Programmer's Guide and Examples
  7. 5Getting Started: Evaluating MSPM0 USB
  8. 6Summary
  9. 7References
  10. 8USB Glossary

3.2.5 Layout Considerations

Similar to USB devices, matching trace lengths on the data lines to verify the two lines are synchronized is critical.

Designers must be careful to keep USB data traces clean, with minimal vias (in pairs if one must be used), routed away from high-speed signals. The DP/DM signals must have a clean and complete ground plane for reference in a layer behind or above the signals. The differential resistance on these signals must be as close to 90Ω as possible, which can be calculated using most PCBCAD software.