TIDA-010041

Nano power, wide VIN (12 V max) supervisor reference design used as comparator or power sequencer

TIDA-010041

Design files

Overview

This reference design highlights a versatile use case for a low-power reset IC and a watchdog timer. With less than 1-µA current consumption, the TPS3840 device can be configured to work either as a comparator (with simple 3-pin configuration) or as a universal power supply supervisor that can be daisychained as a sequencer. Additionally, the response and delay time can be configured using an external capacitor. For applications requiring a watchdog operation, the TPS3431 device, a stand-alone programmable watchdog timer with ±2.5% accuracy (typ) can be used.

Features
  • Threshold detection (TPS3840): Self-powered threshold detector using a voltage supervisor as a comparator (with 3-pin configuration and no external power supply)
    • Very low quiescent current (<700 nA) architectures with a set threshold from 1.6 V–4.9 V in 0.1-V steps and fast power-on (<250-µs startup delay) with a user-controllable response time (80 µs to 600 ms using external capacitor)
  • Reset for power supply supervision and sequencing (TPS3840): Useful for multirail reset supervision and startup sequencing
    • Active low and active high configurations available with thresholds from 1.6 V–4.9 V and TD from 80 µs–600 ms
  • Watchdog timer (TPS3431): User-adjustable timer with enable pin and wide input range
    • Low current consumption (20 µA maximum) for watchdog function and user-configurable timeout using an external resistor and capacitor

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUEJ9.PDF (4995 K)

Reference design overview and verified performance test data

TIDRY82A.PDF (532 K)

Detailed schematic diagram for design layout and components

TIDRY83.PDF (48 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRY84A.PDF (344 K)

Detailed overview of design layout for component placement

TIDRY86A.ZIP (1948 K)

Files used for 3D models or 2D drawings of IC components

TIDCF50A.ZIP (383 K)

Design file that contains information on physical board layer of design PCB

TIDRY85A.PDF (2158 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

ESD & surge protection ICs

TVS05005V flat-clamp surge protection device

Data sheet document-pdfAcrobat PDF open-in-new HTML
ESD & surge protection ICs

TVS140014V flat-clamp surge protection device

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision op amps (Vos<1mV)

OPA320Precision, zero-crossover, 20-MHz, 0.9-pA Ib, RRIO, CMOS operational amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
Supervisor & reset ICs

TPS3431Standard programmable watchdog timer with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Supervisor & reset ICs

TPS3840Nanopower high-input voltage supervisor with manual reset and programmable-reset time delay

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide Nano Power, Wide VIN (12 V max) Supervisor Reference Design Dec. 19, 2018
Technical article Improve circuit breaker leakage current response with a voltage supervisor Jan. 10, 2019

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