TPS3820 Voltage Monitor With Watchdog Timer | TI.com

TPS3820 (ACTIVE)

Voltage Monitor With Watchdog Timer

 

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 VDD becomes greater than 1.1 V. Thereafter, the supply voltage supervisor monitors VDD and keeps RESET active low as long as VDD remains less than the threshold voltage, VIT−. An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time, td, starts after VDD has risen above the threshold voltage (VIT− + VHYS). When the supply voltage drops below the threshold voltage VIT−, the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage, VIT–, 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).

Features

  • 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

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Parametrics Compare all products in Supervisor & reset ICs

 
Threshold Voltage 1 (Typ) (V)
Number of supplies monitored
VCC (Max) (V)
VCC (Min) (V)
Output driver type/reset output
Time Delay (ms)
Features
Rating
Operating temperature range (C)
Watchdog timer WDI (sec)
TPS3820 TPS3813 TPS3823 TPS3824 TPS3825 TPS3828 TPS3852
2.93
4.55    
2.25
2.64
2.93
4.55    
2.25
2.63
2.93
4.55    
2.25
2.63
2.93
4.55    
2.93
4.55    
2.93
4.55    
3.07
3.17    
1     1     1     1     1     1     1    
5.5     6     5.5     5.5     5.5     5.5     6.5    
1.1     2     1.1     1.1     1.1     1.1     1.6    
Active-low
Push-pull    
Active-low
Open-drain    
Active-low
Push-pull    
Active-high
Active-low
Push-pull    
Active-high
Active-low
Push-pull    
Active-low
Open-drain    
Active-low
Open-drain    
25     25     200     200     200     200     200    
Active-low enable
Manual reset
Watchdog timer    
Watchdog timer     Active-low enable
Manual reset
Watchdog timer    
Watchdog timer
Dual output    
Active-low enable
Manual reset
Dual output    
Active-low enable
Manual reset
Watchdog timer    
Active-low enable
Manual reset
Watchdog disable
Watchdog timer
Window watchdog    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 125    
0.2     Programmable     1.6     1.6     None     1.6     Programmable