SWRA825 January   2025 IWR6843 , LP87745-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Regulatory Needs for Electro-Sensitive Protective Equipment (ESPE)
    2. 1.2 Different Types of Electro-Sensitive Protective Equipment (ESPE)
  5. 2Advantages of Radar Sensors in Industrial Applications
  6. 3Safety Concept Evaluation/Analysis
    1. 3.1 System Requirements
      1. 3.1.1 Stationary Use Case
      2. 3.1.2 Mobile Use Case
    2. 3.2 Considerations for Sensing Architectures
      1. 3.2.1 System Level Architecture
        1. 3.2.1.1 Bi-Static With Spatial Diversity
        2. 3.2.1.2 Co-Located Bi-Static (Two Sensor Products)
        3. 3.2.1.3 Co-Located Bi-Static (Single Sensor Product, Dual IWR6843)
        4. 3.2.1.4 Mono-Static (Single Sensor Product, Single IWR6843)
        5. 3.2.1.5 Summary
      2. 3.2.2 Latent Fault Monitoring
    3. 3.3 Sensor Level Architecture
      1. 3.3.1 Sensor Level Architecture for CAT 2
      2. 3.3.2 Sensor Level Architecture for Cat 3
  7. 4IEC TS 61496-5 Functional Test Results
  8. 5Other Considerations
    1. 5.1 Vibrations
    2. 5.2 Clock
  9. 6Conclusion
  10. 7References

3.3.2 Sensor Level Architecture for Cat 3

In addition to the built-in monitoring and diagnostics features and the external test equipment monitoring as described above for the Cat 2 architecture, there is the option to implement logical redundant processing chains in the IWR6843 for a Cat 3 architecture as shown in Figure 3-15.

Conceptual Block Diagram for Cat 3 Architecture Figure 3-15 Conceptual Block Diagram for Cat 3 Architecture

The IWR6843 device offers different processing nodes to realize the radar processing. The IWR6843 has two processing nodes, a hardware accelerator (HWA) and a digital signal processor (DSP). Up to four different input signals can be processed from the HWA and the DSP. For Cat 3, the mmWave detection processing chain could use both and performs a crosscheck of the calculated results. The crosscheck would be performed from the R4F Core, which can run in lockstep mode. Two different tasks should process the data from the HWA and from the DSP. The results from task 1 and task 2 would then be compared against each other. In case of a mismatch, an error should be signaled to the PMIC and the outputs should be put into a safe state.

This redundant processing for Cat 3 is currently not implemented and supported in any SW deliverables: neither the mmWave software development kit (SDK) nor the radar toolbox. Thus such a software architecture would have to be implemented by the customer.
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