SDAA146 October   2025 AM62L , AM62P , AM67 , AM68 , AM69 , TDA4VM

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1VTM Module
    1. 1.1 VTM Module Description
    2. 1.2 VTM Working Principle and Usage
  5. 2Hardware Temperature Protection of TI Processors
    1. 2.1 Over-Temperature Protection Threshold of VTM
    2. 2.2 Maximum Hardware Temperature Protection
  6. 3Software Temperature Protection Strategy
    1. 3.1 Optional Software Temperature Protection Measures
    2. 3.2 Linux Temperature Protection Logic
    3. 3.3 Linux Disable Unused Cores
  7. 4Summary
  8. 5References

1 VTM Module

VTM (Voltage Thermal management) module provides control, status, and interrupt and event generation functionality related to integrated temperature sensors and user-programmed thermal events. In chip thermal management, we primarily focus on its temperature measurement, warning emission, and interrupt functionality. Figure 1-1 shows the block diagram of VTM inside the processor. VTM has the direct connection with reset controller of the processor because it could directly send the command to reset the processor. Additionally, the VTM includes a set of memory-mapped registers used to store device-specific operating voltages (AVSVNOM) set during device testing. These values can be used by the system AVS software to adjust the operating voltage of the device to achieve optimal working conditions (power consumption and performance balance).

VTM System Diagram Figure 1-1 VTM System Diagram

TI has plenty of SOC series, and the VTM system connection is quite similar among them. TI has plenty of SOC series, and the VTM system connection is quite similar among them. VTM is generally located in the wake-up domain (WKUP), which is the first to start working when the SOC powers up. Temperature management immediately intervenes upon power-up to ensure the normal operation and longevity of the entire SOC.