SFFS169A April   2022  – May 2022 TPS3704 , TPS3704-Q1

 

  1. 1Introduction
    1.     Trademarks
  2. 2 TPS3704x-Q1 Hardware Component Functional Safety Capability
  3. 3Development Process for Management of Systematic Faults
    1. 3.1 TI New-Product Development Process
    2. 3.2 TI Functional Safety Development Process
  4. 4 TPS3704x-Q1 Component Overview
    1. 4.1 Targeted Applications
    2. 4.2 Hardware Component Functional Safety Concept
    3. 4.3 Functional Safety Constraints and Assumptions
  5. 5Description of Hardware Component Parts
  6. 6 TPS3704x-Q1 Management of Random Faults
    1. 6.1 Fault Reporting
    2. 6.2 Functional Safety Mechanism Categories
    3. 6.3 Description of Functional Safety Mechanisms
      1.      A Summary of Recommended Functional Safety Mechanism Usage
        1.       B Distributed Developments
          1.        B.1 How the Functional Safety Lifecycle Applies to TI Functional Safety Products
          2.        B.2 Activities Performed by Texas Instruments
          3.        B.3 Information Provided
            1.         C Revision History

4.3 Functional Safety Constraints and Assumptions

In creating a functional Safety Element out of Context (SEooC) concept and doing the functional safety analysis, TI generates a series of assumptions on system level design, functional safety concept, and requirements. These assumptions (sometimes called Assumptions of Use) are listed below. Additional assumptions about the detailed implementation of safety mechanisms are separately located in Section 6.3.

The TPS3704x-Q1 Functional Safety Analysis was done under the following system assumptions:

  • [SA_1] The external System shall determine on TPS3704x-Q1 reset signal whether transistion to safe state is needed and execute that transition.
  • [SA_2] Voltage thresholds and timing requirements for TPS3704x-Q1 shall be set to match system requirements.
  • [SA-3] The system shall include a voltage clamp to prevent overvoltage on the sense inputs of TPS3704x-Q1
  • [SA-4] All inputs to the TPS3704x-Q1 SVS shall meet the recommended operating conditions defined in the device specification and does not exceed absolute operating conditions defined therein
  • [SA-5] The operating temperature of the TPS3704x-Q1 SVS shall meet the ambient and junction temperature limits defined in the device specification
  • [SA-6] All external components to the TPS3704x-Q1 SVS shall meet the electrical characteristics defined in the device specification
  • [SA-7] The layout of the system board shall follow the layout guidelines as defined in the TPS3704x-Q1SVS device specification

TPS3704x-Q1 shall be considered in the safe state when no power is applied, or when operating in a fully functional and fault-free integrated system.

TPS3704x-Q1 shall be considered in a safe state when Over-Voltage (OV), Under-Voltage(UV), is detected on one or more sense inputs and signaled to an external host element of the system/item. The host is responsible for fault reaction and transitioning of the system to a system safe state.

During integration activities these assumptions of use and integration guidelines described for this component shall be considered. Use caution if one of the above functional safety assumptions on this component cannot be met, as some identified gaps may be unresolvable at the system level.