Nano power, wide VIN (12 V max) supervisor reference design used as comparator or power sequencer
TIDA-010041
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Key Document

Description

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

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Design Files

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TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA320  Precision, Zero-Crossover, 20MHz, 0.9pA Ib, RRIO, CMOS Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS3431  Standard Programmable Watchdog Timer With Enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS3840  Nanopower high-input voltage supervisor with manual reset and programmable-reset time delay  Power management  Sample & Buy View Design Kits & Evaluation Modules
TVS0500  5V flat-clamp surge protection device  Circuit protection  Sample & Buy View Design Kits & Evaluation Modules
TVS1400  14V flat-clamp surge protection device  Circuit protection  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA320 Download Download
TPS3431 Download
TPS3840 Download Download
TVS0500 Download Download
TVS1400 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 4995 19 Dec 2018
Design files (6)
Title Type Size (KB) Date
PDF 2158 11 Apr 2019
PDF 344 11 Apr 2019
PDF 532 11 Apr 2019
ZIP 383 11 Apr 2019
ZIP 1948 11 Apr 2019
PDF 48 19 Dec 2018
Related Tools & Software

Design Kits & Evaluation Modules  ( 1 )

Name Part Number Tool Type
SimpleLink™ MSP432P4111 high-precision ADC MCU LaunchPad™ Development Kit  MSP-EXP432P4111  Development Kits 

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