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 Safety Concept Evaluation/Analysis

For this specific safety concept evaluation and analysis, the focus is on the Radar sensing part. However, in order to fulfill the requirements for an electro-sensitive protective equipment (ESPE), assumptions have to be made for the rest of the modules.

The IWR6843 device that is used in this concept analysis includes the entire millimeter wave blocks and analog baseband signal chain for three transmitters and four receivers, as well as a customer-programmable MCU and DSP (see Figure 3-1). The IWR6843 is a Functional Safety-Compliant device, developed for functional safety applications. Safety documentation is available to aid IEC 61508 for functional safety system design up to SIL 3.

IWR6843 Block Diagram Figure 3-1 IWR6843 Block Diagram

TI provides essential collaterals as shown in Figure 3-2, which are required for the successful FuSa certification of the system. The essential Fusa collaterals are only disclosed to the customers on request through Secure Resources.

Essential FuSa Collaterals Figure 3-2 Essential FuSa Collaterals

The mmWave Software Diagnostic Library (SDL) is a collection of functions for access to safety functions and response handlers for various safety mechanisms for TI mmWave sensors. These functions assist in the development of software applications involving functional safety. The mmwave SDL release package contains a Compliance Support Package (CSP). The Compliance Support Package (CSP) is evidence that TI provides to customers for software components that have been developed using the rigorous development process for functional safety software. The CSP is intended to assist you in your certification efforts for the integrated system.

The used LP87745-Q1 PMIC device (see Figure 3-3) is designed to meet the power management requirements of the IWR mmWave devices in various industrial radar applications. The LP87745-Q1 is a functional safety-compliant device, developed for functional safety applications. Safety documentation is available to aid IEC 61508 and ISO 26262.

LP87745-Q1 Block Diagram Figure 3-3 LP87745-Q1 Block Diagram