SLVA528D September   2012  – August 2021 TPS65381-Q1 , TPS65381A-Q1

 

  1.   Trademarks
  2. 1Introduction
  3. 2Product Overview
    1. 2.1 Safety Functions and Diagnostics Overview
    2. 2.2 Target Applications
    3. 2.3 Product Safety Constraints
  4. 3Development Process for Management of Systematic Faults
    1. 3.1 TI New-Product Development Process
  5. 4TPS65381x-Q1 Product Architecture for Management of Random Faults
    1. 4.1 Device Operating States
    2.     Device Operating States (continued)
    3. 4.2 NRES (MCU Reset) Driver and ENDRV (SAFING Path Enable) Driver
  6. 5TPS65381x-Q1 Architecture Safety Mechanisms and Assumptions of Use
    1. 5.1 Power Supply
    2. 5.2 Regulated Supplies
      1. 5.2.1 VDD6 Buck Switch-Mode Supply
      2. 5.2.2 VDD5 Linear Supply
      3. 5.2.3 VDD3/5 Linear Supply
      4. 5.2.4 VDD1 Linear Supply
      5. 5.2.5 VSOUT1 Linear Supply
      6. 5.2.6 Charge Pump
    3. 5.3 Diagnostic, Monitoring, and Protection Functions
      1. 5.3.1 External MCU Fault Detection and Management
        1. 5.3.1.1 External MCU Error Signal Monitor (MCU ESM)
        2. 5.3.1.2 Watchdog Timer
      2. 5.3.2 Voltage Monitor (VMON)
      3. 5.3.3 Loss-of-Clock Monitor (LCMON)
      4. 5.3.4 Junction Temperature Monitoring and Current Limiting
      5. 5.3.5 Analog and Digital MUX (AMUX and DMUX) and Diagnostic Output Pin (DIAG_OUT)
      6. 5.3.6 Analog Built-In Self-Test (ABIST)
      7. 5.3.7 Logic Built-In Self-Test (LBIST)
      8. 5.3.8 Device Configuration Register Protection
  7. 6Application Diagrams
    1. 6.1 TPS65381x-Q1 With TMS570
    2. 6.2 TPS65381x-Q1 With C2000
    3. 6.3 TPS65381x-Q1 With TMS470
  8. 7TPS65381x-Q1 as Safety Element out of Context (SEooC)
    1. 7.1 TPS65381x-Q1 Used in an EV/HEV Inverter System
    2. 7.2 SPI Note
  9. 8Revision History

2.2 Target Applications

The TPS65381x-Q1 device is designed for use as the microcontroller power supply in general-purpose safety applications such as:

  • Motor-control systems, electronic power steering (EPS) systems, and electrical vehicle (EV) power train
  • Automotive braking systems, including anti-lock braking (ABS), anti-lock braking with traction control (ABS+ TC), and electronic stability control (ESC)
  • Automotive airbag applications
  • Battery Monitoring applications
  • Industrial safety applications, including motor-driver, factory automation, building control, and other applications

In designing this component, TI made various assumptions about how it could be used to address expected requirements for motor-control systems, braking applications, and airbag applications.

In the case of overlapping requirements between target systems, TI designed the device respecting the most stringent requirement. For example, the fault-tolerant response-time intervals in an ESC application are typically on the order of 100 ms. In an EPS application, the fault-tolerant response-time interval is typically on the order of 10 ms. In such case, TI has performed timer subsystem analysis respecting a fault-tolerant time interval less than 10 ms.

Although TI has considered certain applications while developing this device, this should not restrict a customer who wishes to implement other systems. With all safety-critical components, the system integrator must rationalize the component safety concept to confirm that it meets the system safety requirements.