SPRUJ91A april   2023  – may 2023 AM68 , AM68 , AM68A , AM68A , TDA4AL-Q1 , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VE-Q1 , TDA4VL-Q1 , TDA4VL-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Contributions to Power
  5. 2How to Use the Tool
  6. 3Use Case
    1. 3.1 Core Processor Utilization
    2. 3.2 Key IP Frequency Selection
    3. 3.3 Memory Interfaces
    4. 3.4 PHYs
    5. 3.5 High Speed Serial Interface
    6. 3.6 Environmental
    7. 3.7 LVCMOS IOs
    8. 3.8 Buttons
    9. 3.9 Starting Use Case
  7. 4Results Sheet
    1. 4.1 Thermal Power Estimate
    2. 4.2 Peak / PDN Power Estimate
  8. 5Three Specific Pre-Loaded Use Case Results
    1. 5.1 ARM Only
    2. 5.2 Superset
    3. 5.3 Valet Park
  9. 6Summary of Power for Pre-Populated Use Cases
  10. 7Revision History

Abstract

The Excel-based J721S2 Power Estimation tool allows users to estimate thermal power based on specified loadings for different components (compute cores and peripherals) of the system-on-chip (SoC). The tool allows the user to pre-populate the various fields (which components are used, and utilization of the major components) from a set of representative use cases. This gives a starting point from which a new use case can be customized to judge the power and loadings of their own use case. The tool provides a breakdown of thermal power at the junction temperature (Tj) entered, and also provides a table of power delivery network (PDN) currents computed for this defined use case at Tj = 125°C or 105°C. The J721S2 Power Estimation tool supports the SOCs (e.g. J721S2, TDA4VE, TDA4AL, TDA4VL, AM68) in the J721S2 family.

The tool gives two power estimates:

  1. Thermal power estimate: The time constant for heating or cooling an SoC is on the order of seconds or minutes. Because this is the primary use for the tool, the loadings represent the average activity over a duration of seconds or minutes.
  2. Peak / PDN estimate: The time constant for peak current (power) is on the order of a microsecond. Though a use case (on average) can utilize a given component for say 70%, for windows of time that component is at 100% utilization. The tool’s calculation for Peak / Power Delivery Network (PDN) estimates automatically increases the loading on key intellectual property (IP) that is enabled in order to create the PDN requirements.

Download the tool described in this document from https://www.ti.com/lit/zip/SPRUJ91A.