SLVS331J December   2000  – August 2024 TPS3813

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Switching Characteristics
    8. 6.8 Dissipation Ratings
    9. 6.9 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Input Voltage (VDD)
        1. 7.3.1.1 VDD Hysteresis
        2. 7.3.1.2 VDD Glitch Immunity
      2. 7.3.2 User-Programmable Watchdog Timer (WDI)
      3. 7.3.3 RESET Output
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation (VDD > VIT)
      2. 7.4.2 Above Power-On Reset But Less Than Threshold (VPOR < VDD < VIT)
      3. 7.4.3 Below Power-On Reset (VDD < VPOR)
    5. 7.5 Programming
      1. 7.5.1 Implementing Window-Watchdog Settings
      2. 7.5.2 Programmable Window-Watchdog by Using an External Capacitor
      3. 7.5.3 Lower Boundary Calculation
      4. 7.5.4 Watchdog Software Considerations
      5. 7.5.5 Power-Up Considerations
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Related Links
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

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8.2 Typical Application

A typical application example (see Figure 8-1) is used to describe the function of the watchdog in more detail. To configure the window watchdog function, two pins are provided by the TPS3813xxx. These pins set the window time-out and ratio. The window watchdog ratio is a fixed ratio, which determines the lower boundary of the window frame. It can be configured in two different frame sizes.

TPS3813 Application Example
A. Use this pulldown resistor if a GPIO pin is used to drive the WDI input pin of the TPS3813xxx to keep the WDI pin from floating during power up.
Figure 8-1 Application Example
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