RESET

WDT

_

+

Rising Edge

Detection

Watchdog

Ratio

Detection

Reset L ogic

and Timer

Bandgap

Voltage

Reference

Oscillator

Detection

Circuit

WDI

WDR

GND

Power t o c ircuitry

GND

GND

GND

Copyright © 2016, Texas Instruments Incorporated

9

TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50

www.ti.com

SLVS331H – DECEMBER 2000 – REVISED JULY 2016

Product Folder Links: TPS3813J25 TPS3813L30 TPS3813K33 TPS3813I50

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Copyright © 2000–2016, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The TPS3813xxx family of supervisory circuits provide circuit initialization and timing supervision signals. During

family have a fixed threshold voltage set by an internal voltage divider.

The TPS3813xxx family incorporates a so-called window-watchdog timer, which has a programmable delay and

window ratio. The supervised processor must trigger the WDI pin of the TPS3813xxx within the user-

programmable window to keep RESET from asserting. The upper limit of the watchdog time-out can be set by

8.2 Functional Block Diagram

8.3 Feature Description

The TPS3813xxx family incorporates both a voltage supervisor and a window-watchdog timer into a single

device. The device monitors the input voltage and the supervised processor must trigger the WDI pin of the

TPS3813xxx within the user-programmable window to keep RESET from asserting.