TPS3851 Datasheet, PDF (1/31 Pages) Texas Instruments – Precision Voltage Supervisor with Integrated Watchdog Timer

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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: V_DD = 1.6 V to 6.5 V
• Low Quiescent Current: I_DD = 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 (V_ITN)
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 (V_ITN) 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.