TPS3850 Datasheet, PDF (1/35 Pages) Texas Instruments – Precision Voltage Supervisor with Programmable Window Watchdog Timer

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TPS3850
SBVS301 – OCTOBER 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: I_DD = 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 (V_IT+(OV)) and undervoltage (V_IT–(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 (V_IT+(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.