TPS3828 Voltage monitor with watchdog timer | TI.com

TPS3828
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
Voltage monitor with watchdog timer

 

Recommended alternative parts

  • TPS3828-Q1  -  AEC-Q100 qualified version of this device for automotive applications
  • TPS3850  -  A window detector with built-in window watchdog timer for overvoltage and undervoltage detection
  • TPS3851  -  Voltage supervisor with standard watchdog timer that offers high accuracy (0.8%) and low IQ (10 µA)
  • TPS3431  -  A standalone watchdog timer with no built-in voltage monitoring feature

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

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Part number Order 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)
TPS3828 Order now 2.93
4.55    
1     5.5     1.1     Active-low
Open-drain    
200     Active-low enable
Manual reset
Watchdog timer
Safety documentation    
Catalog     -40 to 85     1.6    
TPS3813 Order now 2.25
2.64
2.93
4.55    
1     6     2     Active-low
Open-drain    
25     Watchdog timer     Catalog     -40 to 85     Programmable    
TPS3820 Order now 2.93
4.55    
1     5.5     1.1     Active-low
Push-pull    
25     Active-low enable
Manual reset
Watchdog timer
Safety documentation    
Catalog     -40 to 85     0.2    
TPS3823 Order now 2.25
2.63
2.93
4.55    
1     5.5     1.1     Active-low
Push-pull    
200     Active-low enable
Manual reset
Watchdog timer
Safety documentation    
Catalog     -40 to 85     1.6    
TPS3824 Order now 2.25
2.63
2.93
4.55    
1     5.5     1.1     Active-high
Active-low
Push-pull    
200     Watchdog timer
Dual output
Safety documentation    
Catalog     -40 to 85     1.6    
TPS3850 Order now Adjustable
1.11
1.15
1.67
1.72
2.79
2.88
3.06
3.16
4.65
4.8    
1     6.5     1.6     Active-low
Open-drain    
Programmable     Undervoltage and overvoltage monitor
Watchdog disable
Watchdog timer
Window watchdog
Safety documentation    
Catalog     -40 to 125     Programmable    
TPS3851 Order now 1.67
1.73
2.32
2.4
2.79
2.88
3.07
3.17
4.65
4.8    
1     6.5     1.6     Active-low
Open-drain    
200     Active-low enable
Manual reset
Watchdog disable
Watchdog timer
Safety documentation    
Catalog     -40 to 125     Programmable    
TPS3852 Order now 3.07
3.17    
1     6.5     1.6     Active-low
Open-drain    
200     Active-low enable
Manual reset
Watchdog disable
Watchdog timer
Window watchdog
Safety documentation    
Catalog     -40 to 125     Programmable