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TPS3431 Standard Programmable Watchdog Timer with Enable
SNVSB66A
July 2018 – October 2021
TPS3431
PRODUCTION DATA
CONTENTS
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TPS3431 Standard Programmable Watchdog Timer with Enable
1
Features
2
Applications
3
Description
4
Revision History
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Timing Requirements
6.7
Timing Diagrams
6.8
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Enable Input (EN) and Enable Output (ENOUT)
7.3.2
Watchdog Mode
7.3.2.1
CWD
7.3.2.2
Watchdog Input WDI
7.3.2.3
Watchdog Output WDO
7.3.2.4
SET1
7.4
Device Functional Modes
7.4.1
VDD is Below VPOR ( VDD < VPOR)
7.4.2
Above Power-On-Reset, But Less Than VDD(min) (VPOR ≤ VDD < VDD(min))
7.4.3
Normal Operation (VDD ≥ VDD(min))
8
Application and Implementation
8.1
Application Information
8.1.1
CWD Functionality
8.1.1.1
Factory-Programmed Timing Options
8.1.1.2
CWD Adjustable Capacitor Watchdog Timeout
8.2
Typical Application
8.2.1
Design 1 Requirements
8.2.2
Detailed Design 1 Procedure
8.2.2.1
Calculating WDO Pullup Resistor Design 1
8.2.2.2
Setting the Watchdog Design 1
8.2.3
Application Curves Design 1
8.3
Programmable Application
8.3.1
Design 2 Requirements
8.3.2
Detailed Design 2 Procedure
8.3.2.1
Calculating WDO Pullup Resistor Design 2
8.3.2.2
Setting the Watchdog Design 2
8.3.2.3
Watchdog Disabled During Initialization Period Design 2
8.3.2.4
Programmable Disable Feature Design 2
8.3.3
Application Curves Design 2
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
Device and Documentation Support
11.1
Device Support
11.2
Documentation Support
11.2.1
Related Documentation
11.3
Receiving Notification of Documentation Updates
11.4
Support Resources
11.5
Trademarks
11.6
Electrostatic Discharge Caution
11.7
Glossary
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
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DATA SHEET
TPS3431 Standard Programmable Watchdog Timer with Enable
1
Features
Factory-programmed precision watchdog timers:
±2.5% Accurate watchdog timeout (WDT) typical at 25°C
Watchdog disable feature
User-programmable watchdog timeout
Input voltage range: V
DD
= 1.8 V to 6.5 V
Low quiescent current: I
DD
= 10 µA (typical)
Active-low open-drain output
Enable input (EN) and enable output (ENOUT)
Available in a small 3-mm × 3-mm, 8-pin VSON package
Junction operating temperature range:
–40°C to +125°C
2
Applications
Cellular module asset tracker
Energy storage power conversion system (PCS)
Electricity meter
Motion detector (PIR, uWave, etc.)
IP network camera
Surgical equipment
