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Product details

Parameters

Number of supplies monitored 1 Threshold voltage 1 (Typ) (V) Adjustable, 1.11, 1.15, 1.67, 1.72, 2.79, 2.88, 3.06, 3.16, 4.65, 4.8 Features Undervoltage and overvoltage monitor, Watchdog disable, Watchdog timer, Window watchdog Reset threshold accuracy (%) 0.8 Output driver type/reset output Active-low, Open-drain Time delay (ms) Programmable VCC (Max) (V) 6.5 Rating Catalog VCC (Min) (V) 1.6 Watchdog timer WDI (sec) Programmable Operating temperature range (C) -40 to 125 open-in-new Find other Supervisor & reset ICs

Package | Pins | Size

VSON (DRC) 10 9 mm² 3 x 3 open-in-new Find other Supervisor & reset ICs

Features

  • 0.8% Voltage Threshold Accuracy
  • Precision Over- and Undervoltage Monitoring:
    • Supports Common Rails from 0.9 V to 5.0 V
    • ±4% and ±7% Fault Windows Available
    • 0.5% Hysteresis
  • Factory-Programmed Precision Watchdog and Reset Timers:
    • ±15% Accurate WDT and RST Delays
  • Watchdog Disable Feature
  • User-Programmable Watchdog Timeout
  • User-Programmable Reset Delay
  • Input Voltage Range: VDD = 1.6 V to 6.5 V
  • Low Supply Current: IDD = 10 µA (typ)
  • Open-Drain Outputs
  • Available in a Small 3-mm × 3-mm, 10-Pin VSON Package
  • Junction Operating Temperature Range:
    –40°C to +125°C
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Description

The TPS3850 combines a precision voltage supervisor with a programmable window watchdog timer. The TPS3850 window comparator achieves 0.8% accuracy (–40°C to +125°C) for both overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) thresholds. The TPS3850 also includes accurate hysteresis on both thresholds, making the device ideal for use with tight tolerance systems. The supervisor RESET delay can be set by factory-programmed default delay settings, or programmed by an external capacitor. The factory-programmed RESET delay features a 15% accuracy, high-precision delay timing.

The TPS3850 includes a programmable window watchdog timer for a wide variety of applications. The dedicated watchdog output (WDO) enables increased resolution to help determine the nature of fault conditions. The window watchdog timeouts can be set by factory-programmed default delay settings, or programmed by an external capacitor. The watchdog can be disabled via logic pins to avoid undesired watchdog timeouts during the development process.

The TPS3850 is available in a small 3.00-mm × 3.00-mm, 10-pin VSON package.

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Exact equivalent in functionality and parametrics to the compared device:
TPS3850-Q1 ACTIVE Automotive, window supervisor for OV & UV monitoring with window watchdog timer & programmable delay AEC-Q100 qualified version of this device
Similar but not functionally equivalent to the compared device:
TPS3430 ACTIVE Window watchdog timer with programmable reset delay A standalone window watchdog timer to sense both early and late faults
TPS3431 ACTIVE Standard programmable watchdog timer with enable A standalone watchdog timer with no built-in voltage monitoring feature

Technical documentation

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Type Title Date
* Datasheet TPS3850 Precision Voltage Supervisor with Programmable Window Watchdog Timer datasheet (Rev. A) Nov. 10, 2016
More literature Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
Application notes Comparing Voltage and Processor Monitoring Solutions Apr. 05, 2019
Application notes Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) Oct. 09, 2018
Application notes How Comparator Topology Influences Propagation Delay Apr. 05, 2017
Technical articles Exploring watchdog timer applications Feb. 02, 2017
User guides TPS3850EVM-781 Evaluation Module Oct. 24, 2016
Technical articles A New Understanding: Blast Motion redefines movement, tracking and training for athletes. Aug. 06, 2014
Technical articles Improving Fly-Buck Regulation Using Opto (Part-1) Jul. 15, 2014
Technical articles Altium and WEBENCH – together at last Jul. 12, 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$29.00
Description
The TPS3850EVM-781 evaluation module (EVM) is designed for a typical configuration to evaluate the operation and performance of the TPS3850 low-quiescent current (Iq), 0.8% accurate supervisor with integrated watchdog timer.
Features
  • High threshold accuracy: 0.8%
  • User-programmable watchdog timer
  • User-programmable reset delay
  • Open-drain RESET output
  • Independent open-drain watchdog output

Design tools & simulation

SIMULATION MODELS Download
SBVM648A.ZIP (9 KB) - PSpice Model
SIMULATION MODELS Download
SBVM649A.ZIP (67 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
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Isolated Shunt Current Measurement with Standalone Digital Filters Reference Design
TIDA-01639 — This reference design implements a class 0.5 three phase energy measurement system with isolated shunt sensors by using isolated modulators and independent digital filters, enabling a wider choice of host microcontrollers (MCU) as integrated sync filters are no longer required. In this design (...)
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CAD/CAE symbols

Package Pins Download
VSON (DRC) 10 View options

Ordering & quality

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