SNVSCK5 April   2024 TPS3842

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 6 Specification
    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 Timing Diagram
  8. 7 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1 SENSE Input
        1. 8.3.1.1 SENSE Hysteresis
      2. 8.3.2 Selecting the SENSE Delay Time
      3. 8.3.3 Selecting the RESET Delay Time
      4. 8.3.4 RESET Output
    4. 8.4 Device Functional Modes
      1. 8.4.1 Normal Operation (VDD > VDD(min))
      2. 8.4.2 Above Power-On Reset but Less Than VDD(min) (VPOR < VDD < VDD(min))
      3. 8.4.3 Below Power-On Reset (VDD < VPOR)
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Meeting the Sense and Reset Delay
      3. 9.2.3 Application Curve
      4. 9.2.4 Power Supply Recommendations
      5. 9.2.5 Layout
        1. 9.2.5.1 Layout Guidelines
        2. 9.2.5.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Trademarks
    3. 10.3 Electrostatic Discharge Caution
    4. 10.4 Support Resources
    5. 10.5 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.3.1.1 SENSE Hysteresis

TPS3842 device offers built-in hysteresis around the UV threshold to avoid erroneous RESET deassert. The hysteresis (VHYS) is opposite to the threshold voltage for undervoltage options hysteresis is added to the negative threshold (VITN).

GUID-20240301-SS0I-CWDQ-RZWH-S5NL2SGTBDNN-low.svgFigure 8-4 Hysteresis (Undervoltage Active-Low)
Table 8-1 Common Adjustable Hysteresis Lookup Table
Part NumberDEVICE HYSTERESIS OPTION
TPS3842Axx1DRLR1%
TPS3842Axx5DRLR5%
TPS3842Axx0DRLR10%

Knowing the amount of hysteresis voltage, the release voltage for the undervoltage (UV) channel is (VITN + VHYS). Hysteresis is dependent on the device VITN including VITN accuracy and deviations.

Undervoltage (UV)

VITN = 700mV

Voltage Hysteresis (VHYS) = 1% = VITN x 1% = 7mV

Hysteresis Accuracy = +0.5% to +1.5% = 6.65mV to 7.105mV

Release Voltage = VITN + VHYS = 706.65mV to 707.105mV