TPS3820_16 Datasheet, PDF (1/29 Pages) Texas Instruments – Voltage Monitor With Watchdog Timer

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TPS3820, TPS3823, TPS3823A, TPS3824, TPS3825, TPS3828
SLVS165K – APRIL 1998 – REVISED NOVEMBER 2015
TPS382x Voltage Monitor With Watchdog Timer
1 Features
•1 Power-On Reset Generator With Fixed Delay
Time of 200 ms (TPS3823/4/5/8) or 25 ms
(TPS3820)
• Manual Reset Input (TPS3820/3/5/8)
• Reset Output Available in Active-Low
(TPS3820/3/4/5), Active-High (TPS3824/5), and
Open Drain (TPS3828)
• Supply Voltage Supervision Range:
2.5 V, 3 V, 3.3 V, 5 V
• Watchdog Timer (TPS3820/3/4/8)
• Supply Current of 15 μA (Typical)
• 5-Pin SOT-23 Package
• Temperature Range: −40°C to 85°C
2 Applications
• DSPs, Microcontrollers, or Microprocessors
• Industrial Equipment
• Programmable Controls
• Automotive Systems
• Portable and Battery-Powered Equipment
• Intelligent Instruments
• Wireless Communications Systems
• Notebook and Desktop Computers
3 Description
The TPS382x family of supervisors provide circuit
initialization and timing supervision, primarily for DSP
and processor-based systems. During power on,
RESET asserts when the supply voltage V_DD
becomes greater than 1.1 V. Thereafter, the supply
voltage supervisor monitors V_DD and keeps RESET
active low as long as V_DD remains less than the
threshold voltage, V_IT−. An internal timer delays the
return of the output to the inactive state (high) to
ensure proper system reset. The delay time, t_d, starts
after V_DD has risen above the threshold voltage (V_IT−
+ V_HYS). When the supply voltage drops below the
threshold voltage V_IT−, the output becomes active
(low) again. No external components are required. All
the devices of this family have a fixed-sense
threshold voltage, V_IT–, set by an internal voltage
divider. The TPS382x family also offers watchdog
time out options of 200 ms (TPS3820) and 1.6 s
(TPS3823/4/8).
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS382x
SOT-23 (5)
2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Schematic
3.3 V
Normalized Input Threshold Voltage vs Free-Air
Temperature
V_DD
RESET
TPS3823-33
MR
WDI
GND
100 nF
V_DD
RESET
MSP430C325
I/O
GND
1.001
1
0.999
0.998
0.997
0.996
0.995
−40
−15
10
35
60
85
T_A − Free-Air Temperature − °C
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. UNLESS OTHERWISE NOTED, this document contains PRODUCTION
DATA.