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

5 Description of Hardware Component Parts

A semiconductor component can be divided into parts to enable a more granular functional safety analysis. This can be useful to help assign specific functional safety mechanisms to portions of the design where they provide coverage ending up with a more complete and customizable functional safety analysis. This section includes a brief description of each hardware part of this component and lists the functional safety mechanisms that can be applied to each. This section is intended to provide additional details about the assignment of functional safety mechanisms that can be found in the Safety Analysis Report. The content in this section is also summarized in Appendix A.

Figure 5-1 and Figure 5-2 show the internal block diagrams of the TPS3704x-Q1 quad-channel and dual-channel devices respectively.

Figure 5-1 TPS3704x-Q1 Quad-channel Internal Block Diagram
Figure 5-2 TPS3704x-Q1 Dual-channel Internal Block Diagram

TPS3704x-Q1 is a family of quad, triple, dual, and single precision voltage supervisor(s) where each channel has overvoltage and undervoltage detection capability. The TPS3704x-Q1 features a highly accurate window threshold voltage where the upper and lower thresholds can be customized for symmetric or asymmetic tolerances. The reset signal for the TPS3704x-Q1 is asserted, with a fault detection time delay (tPD = 10 μs max), when the sense voltage is outside of the overvoltage and undervoltage thresholds.

TPS3704x-Q1 includes the resistors used to set the overvoltage and undervoltage thresholds internal to the device. These internal resistors allow for lower component counts and greatly simplifies the design because no additional margins are needed to account for the accuracy of external resistors. The level of integration in the TPS3704x-Q1 enables a total small solution size for any application.

The TPS3704x-Q1 is capable to monitor any voltage rail with high resolution (VIT ≤ 0.8 V: 20 mV steps /
VIT > 0.8 V: 0.5% or 20 mV steps whichever is lower). The device includes fixed reset time delay (tD) options ranging from 20 μs to 1200 ms and can monitor up to four channels while maintaining an ultra-low IQ current of 20 μA (max).