Supervisor. TPS3850 Datasheet

TPS3850 Datasheet PDF


Part

TPS3850

Description

Precision Voltage Supervisor

Manufacture

etcTI

Page 30 Pages
Datasheet
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TPS3850 Datasheet
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TPS3850
SBVS301A – OCTOBER 2016 – REVISED NOVEMBER 2016
TPS3850 Precision Voltage Supervisor with Programmable Window Watchdog Timer
1 Features
1 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
2 Applications
• Safety Critical Applications
• Telematics Control Units
• FPGA and ASIC Applications
• Embedded Controllers
• Microcontroller and DSP Applications
• Video Surveillance
3 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.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS3850
VSON (10)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Fully Integrated Microcontroller Supervisory
Circuit
1.8V
1.2V
TPS3850
SENSE
VDD
SET1 RESET
SET0 WDO
CRST
WDI
CWD
GND
VCORE
VI/O
Microcontroller
RESET
NMI
GPIO
GND
Copyright © 2016, Texas Instruments Incorporated
Overvoltage Threshold (VIT+(OV)) 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.

TPS3850 Datasheet
TPS3850
SBVS301A – OCTOBER 2016 – REVISED 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 ............................................ 10
7 Detailed Description ............................................ 13
7.1 Overview ................................................................. 13
7.2 Functional Block Diagram ....................................... 13
7.3 Feature Description................................................. 14
7.4 Device Functional Modes........................................ 20
8 Application and Implementation ........................ 21
8.1 Application Information............................................ 21
8.2 Typical Applications ................................................ 26
9 Power Supply Recommendations...................... 32
10 Layout................................................................... 32
10.1 Layout Guidelines ................................................. 32
10.2 Layout Example .................................................... 32
11 Device and Documentation Support ................. 33
11.1 Device Support...................................................... 33
11.2 Documentation Support ........................................ 33
11.3 Receiving Notification of Documentation Updates 33
11.4 Community Resources.......................................... 33
11.5 Trademarks ........................................................... 33
11.6 Electrostatic Discharge Caution ............................ 34
11.7 Glossary ................................................................ 34
12 Mechanical, Packaging, and Orderable
Information ........................................................... 34
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (October 2016) to Revision A
Page
• Changed units in ISENSE parameter and footnote 1 in Electrical Characteristics table .......................................................... 5
• Added correct operation state to Figure 2 ............................................................................................................................. 8
• Changed Figure 3 so the SET pins do not bring the watchdog into the disabled state before going to the 1:2 ratio............ 9
• Changed Figure 11 so it no longer has VDD and VSENSE tied together .............................................................................. 11
• Changed Figure 26 so it no longer goes through watchdog disabled .................................................................................. 17
• Added correct operation state to Figure 27 ......................................................................................................................... 18
• Changed RESET to WDO in description of WDO assertion in WDO Functionality section ................................................ 19
2 Submit Documentation Feedback
Product Folder Links: TPS3850
Copyright © 2016, Texas Instruments Incorporated


Features Datasheet pdf Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TPS3850 SBVS301A – OCTOBER 2016 – REVISED NOVEMBER 2016 TPS3850 Precision Voltage Supervisor with Prog rammable Window Watchdog Timer 1 Featu res •1 0.8% Voltage Threshold Accurac y • Precision Over- and Undervoltage Monitoring: – Supports Common Rails f rom 0.9 V to 5.0 V – ±4% and ±7% Fa ult Windows 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 • User-Programmable Rese t Delay • Input Voltage Range: VDD = 1.6 V to 6.5 V • Low Supply Current: IDD = 10 µA (typ) • Open-Drain Outpu ts • Available in a Small 3-mm × 3-m m, 10-Pin VSON Package • Junction Ope rating Temperature Range: –40°C to + 125°C 2 Applications • Safety Critic al Applications • Telematics Control Units • FPGA and ASIC Applications • Embedded Controllers • Microcontroller and DSP Applications • Video Surve.
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