Supervisor. TPS3851 Datasheet

TPS3851 Datasheet PDF


Part

TPS3851

Description

Precision Voltage Supervisor

Manufacture

etcTI

Page 30 Pages
Datasheet
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TPS3851 Datasheet
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TPS3851
SBVS300 – NOVEMBER 2016
TPS3851 Precision Voltage Supervisor with Integrated Watchdog Timer
1 Features
1 0.8% Voltage Threshold Accuracy
• Precision Undervoltage Monitoring:
– Supports Common Rails from 1.8 V to 5.0 V
– 4% and 7% Undervoltage Thresholds
Available
– 0.5% Hysteresis
• Factory-Programmed Precision Watchdog and
Reset Timers:
– ±15% Accurate WDT and RST Delays
• Watchdog Disable Feature
• User-Programmable Watchdog Timeout
• Input Voltage Range: VDD = 1.6 V to 6.5 V
• Low Quiescent Current: IDD = 10 µA (typ)
• Open-Drain Outputs
• Manual Reset Input (MR)
• Available in a Small 3-mm × 3-mm, 8-Pin VSON
Package
• Junction Operating Temperature Range:
–40°C to +125°C
2 Applications
• Safety-Critical Applications
• Telematics Control Units
• FPGAs and ASICs
• Microcontrollers and DSPs
Fully Integrated Microcontroller Supervisory
Circuit
1.8 V
TPS3851
VDD
SET1
MR
CWD
RESET
WDO
WDI
GND
VDD
Microcontroller
RESET
NMI
GPIO
GND
Copyright © 2016, Texas Instruments Incorporated
3 Description
The TPS3851 combines a precision voltage
supervisor with a programmable watchdog timer. The
TPS3851 comparator achieves a 0.8% accuracy
(–40°C to +125°C) for the undervoltage (VITN)
threshold. The TPS3851 also includes accurate
hysteresis on the undervoltage threshold making the
device ideal for use with tight tolerance systems. The
supervisor RESET delay features a 15% accuracy,
high-precision delay timing.
The TPS3851 includes a programmable 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
watchdog timeouts can be programmed either by an
external capacitor, or by factory-programmed default
delay settings. The watchdog can be disabled via
logic pins to avoid undesired watchdog timeouts
during the development process.
The TPS3851 is available in a small 3.00-mm ×
3.00-mm, 8-pin VSON package.
Device Information(1)
PART NUMBER
PACKAGE BODY SIZE (NOM)
TPS3851
VSON (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Undervoltage Threshold (VITN) Accuracy vs
Temperature
0.5
Unit 1
Unit 3
Unit 5
Unit 2
Unit 4
Average
0.3
0.1
-0.1
-0.3
-0.5
-50
-25
0 25 50 75
Temperature (qC)
100 125
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

TPS3851 Datasheet
TPS3851
SBVS300 – NOVEMBER 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics........................................... 5
6.6 Timing Requirements ................................................ 6
6.7 Typical Characteristics .............................................. 8
7 Detailed Description ............................................ 11
7.1 Overview ................................................................. 11
7.2 Functional Block Diagram ....................................... 11
7.3 Device Functional Modes........................................ 14
8 Application and Implementation ........................ 15
8.1 Application Information............................................ 15
8.2 Typical Application ................................................. 18
9 Power Supply Recommendations...................... 21
10 Layout................................................................... 21
10.1 Layout Guidelines ................................................. 21
10.2 Layout Example .................................................... 21
11 Device and Documentation Support ................. 22
11.1 Device Support .................................................... 22
11.2 Documentation Support ........................................ 22
11.3 Receiving Notification of Documentation Updates 22
11.4 Community Resources.......................................... 22
11.5 Trademarks ........................................................... 22
11.6 Electrostatic Discharge Caution ............................ 22
11.7 Glossary ................................................................ 23
12 Mechanical, Packaging, and Orderable
Information ........................................................... 23
4 Revision History
DATE
November 2016
REVISION
*
NOTES
Initial release.
2 Submit Documentation Feedback
Product Folder Links: TPS3851
Copyright © 2016, Texas Instruments Incorporated


Features Datasheet pdf Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TPS3851 SBVS300 – NOVEMBER 2016 TPS3851 Precision Voltage Supervi sor with Integrated Watchdog Timer 1 F eatures •1 0.8% Voltage Threshold Acc uracy • Precision Undervoltage Monito ring: – Supports Common Rails from 1. 8 V to 5.0 V – 4% and 7% Undervoltage Thresholds Available – 0.5% Hysteres is • Factory-Programmed Precision Wat chdog and Reset Timers: – ±15% Accur ate WDT and RST Delays • Watchdog Dis able Feature • User-Programmable Watc hdog Timeout • Input Voltage Range: V DD = 1.6 V to 6.5 V • Low Quiescent C urrent: IDD = 10 µA (typ) • Open-Dra in Outputs • Manual Reset Input (MR) • Available in a Small 3-mm × 3-mm, 8-Pin VSON Package • Junction Operati ng Temperature Range: –40°C to +125 C 2 Applications • Safety-Critical A pplications • Telematics Control Unit s • FPGAs and ASICs • Microcontroll ers and DSPs Fully Integrated Microcontroller Supervisory Circuit 1.8 V TPS3851 VDD SET1 MR CWD RESET WDO W.
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