SBVS286 March 2017 TPS3851-Q1

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Timing Requirements
    7. 6.7Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1RESET
      2. 7.3.2Manual Reset MR
      3. 7.3.3UV Fault Detection
      4. 7.3.4Watchdog Mode
        1. 7.3.4.1CWD
        2. 7.3.4.2Watchdog Input WDI
        3. 7.3.4.3Watchdog Output WDO
        4. 7.3.4.4SET1
    4. 7.4Device Functional Modes
      1. 7.4.1VDD is Below VPOR ( VDD < VPOR)
      2. 7.4.2Above Power-On-Reset, But Less Than VDD(min) (VPOR ≤ VDD < VDD(min))
      3. 7.4.3Normal Operation (VDD ≥ VDD(min))
  8. Application and Implementation
    1. 8.1Application Information
      1. 8.1.1CWD Functionality
        1. 8.1.1.1Factory-Programmed Timing Options
        2. 8.1.1.2Adjustable Capacitor Timing
      2. 8.1.2Overdrive Voltage
    2. 8.2Typical Application
      1. 8.2.1Design Requirements
      2. 8.2.2Detailed Design Procedure
        1. 8.2.2.1Monitoring the 1.8-V Rail
        2. 8.2.2.2Calculating the RESET and WDO Pullup Resistor
        3. 8.2.2.3Setting the Watchdog
        4. 8.2.2.4Watchdog Disabled During Initialization Period
      3. 8.2.3Glitch Immunity
      4. 8.2.4Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Device Support
      1. 11.1.1Device Nomenclature
    2. 11.2Documentation Support
      1. 11.2.1Related Documentation
    3. 11.3Receiving Notification of Documentation Updates
    4. 11.4Community Resources
    5. 11.5Trademarks
    6. 11.6Electrostatic Discharge Caution
    7. 11.7Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Features

  • AEC-Q100 Qualified with the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C4B
  • Input Voltage Range: VDD = 1.6 V to 6.5 V
  • 1% Voltage Threshold Accuracy
  • Low Supply Current: IDD = 10 µA (typ)
  • User-Programmable Watchdog Timeout
  • Factory Programmed Precision Watchdog and Reset Timers:
    • ±15% Accurate WDT and RST Delays
  • Open-Drain Outputs
  • Precision Undervoltage Monitoring:
    • Supports Common Rails from 1.8 V to 5.0 V
    • 4% and 7% Undervoltage Thresholds Available
    • 0.5% Hysteresis
  • Watchdog Disable Feature
  • Available in a Small 3-mm × 3-mm, 8-Pin VSON Package

Applications

  • Safety Critical Applications
  • Automotive Vision Systems
  • Automotive ADAS Systems
  • Telematics Control Units
  • FPGAs and ASICs
  • Microcontrollers and DSPs

Description

The TPS3851-Q1 device combines a precision voltage supervisor with a programmable watchdog timer. The TPS3851-Q1 comparator achieves a 0.8% accuracy (–40°C to +125°C) for the undervoltage (VITN) threshold. The TPS3851-Q1 also includes accurate hysteresis on the undervoltage threshold making the device ideal for use with tight tolerance systems. The supervisor RESET delay features a 15% accuracy, high-precision delay timing.

The TPS3851-Q1 includes a programmable watchdog timer for a wide variety of applications. The dedicated watchdog output (WDO) enables increased resolution to help determine the nature of fault conditions. The watchdog timeouts can be programmed either by an external capacitor, or by factory-programmed default delay settings. The watchdog can be disabled via logic pins to avoid undesired watchdog timeouts during the development process.

The TPS3851-Q1 is available in a small 3.00-mm × 3.00-mm, 8-pin VSON package. The TPS3851-Q1 features wettable flanks that allow for easy optical inspection.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
TPS3851-Q1VSON (8)3.00 mm × 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Circuit

TPS3851-Q1 TPS3851_TypApp.gif