TIDUF89 September   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Detection Theory
    2. 1.2 Multi-Pass Architecture
  8. 2System Overview
    1. 2.1 System Design Theory
      1. 2.1.1 Long Detection Range
        1. 2.1.1.1 Antenna Design for Long Detection Range
        2. 2.1.1.2 SNR Compensation for Long Detection Range
        3. 2.1.1.3 Smart Detection Logic
      2. 2.1.2 Low Power Consumption
        1. 2.1.2.1 Efficient Chirp Design
        2. 2.1.2.2 Deep Sleep Power Modes
        3. 2.1.2.3 Hardware Accelerator
      3. 2.1.3 Low False Alarm Rate
        1. 2.1.3.1 Typical Causes of False Alarms
        2. 2.1.3.2 False Alarms Outside the Detection Zone
        3. 2.1.3.3 False Alarms Within the Detection Zone
        4. 2.1.3.4 Adaptive State Machine
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Software Requirements
    3. 3.3 Test Setup
      1. 3.3.1 Test 1 - Detection Range
      2. 3.3.2 Test 2 - False Alarm Rate
      3. 3.3.3 Test 3 - Power Consumption
    4. 3.4 Test Results
  10. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
  11. 5Tools and Software
  12. 6Document Support
  13. 7Support Resources
  14. 8Trademarks
  15. 9About the Authors

3.3.3 Test 3 - Power Consumption

The power consumption measurement need to be conducted in a typical operating environment for the video doorbell if possible. TI recommends measuring the power consumption for each mode individually, and estimating total power consumption based off the expected time in each mode during typical operation.

To limit the amount of debugging information coming off the radar during a power measurement, TI provides a couple of predefined symbols that can be defined or not to enable power measurement in the different states. Table 3-2 shows which symbols to define to measure power in each mode.

Table 3-2 Symbols to Define to Measure Power in Each Mode
Measure Mode 1 Power Measure Mode 2 Power Measure Mode 3 Power

REMOVE_TRACKER

LOW_MEM

POWER_REDUCTION_MODS

POWER_MEASUREMENT_CFG

STAY_IN_FIRST_PASS_MODE

REMOVE_TRACKER

LOW_MEM

POWER_REDUCTION_MODS

POWER_MEASUREMENT_CFG

STAY_IN_SECOND_PASS_MODE

REMOVE_TRACKER

LOW_MEM

POWER_REDUCTION_MODS

POWER_MEASUREMENT_CFG

STAY_IN_THIRD_PASS_MODE

Each symbol does the following.

Table 3-3 Low Power Mode Symbol Definitions
Symbol Usage
REMOVE_TRACKER Removes the tracker from the project to save memory
LOW_MEM Reduces the size of the radar cube to the minimum needed for all three modes to save memory, requires user to change the linker file
POWER_REDUCTION_MODS Removes the GPIO from the example to reduce power consumption. Requires user to also remove GPIO in sysconfig
POWER_MEASUREMENT_CFG Only outputs power consumption every 100 frames to reduce UART impact on power consumption
STAY_IN_FIRST_PASS_MODE Keeps the demo from switching out of first pass mode for easier debugging
STAY_IN_SECOND_PASS_MODE Keeps the demo from switching out of second pass mode for easier debugging
STAY_IN_THIRD_PASS_MODE Keeps the demo from switching out of third pass mode for easier debugging

When each mode is running, the power consumption tab in the industrial visualizer displays power consumption as a function of time.

TIDEP-01035 Power Consumption Test - Visualizer ViewFigure 3-7 Power Consumption Test - Visualizer View