ST Life.augmented

STWD100

Watchdog
  • active Active

The STWD100 watchdog timer circuits are self-contained devices which prevent system failures that are caused by certain types of hardware errors (non-responding peripherals, bus contention, etc.) or software errors (bad code jump, code stuck in loop, etc.).

The STWD100 watchdog timer has an input, WDI, and an output, WDO. The input is used to clear the internal watchdog timer periodically within the specified timeout period, twd. While the system is operating correctly, it periodically toggles the watchdog input, WDI. If the system fails, the watchdog timer is not reset, a system alert is generated and the watchdog output, WDO, is asserted.

The STWD100 circuit also has an enable pin, EN, which can enable or disable the watchdog functionality. The ENpin is connected to the internal pull-down resistor. The device is enabled if the ENpin is left floating.

pdf Please read
Errata Sheet
pdf Download
Datasheet

Key Features

  • Current consumption 13 μA typ.
  • Available watchdog timeout periods are 3.4 ms, 6.3 ms, 102 ms and 1.6 s
  • Chip enable input
  • Open drain or push-pull WDOoutput
  • Operating temperature range: –40 to +125 °C
  • Package SOT23-5, SC70-5 (SOT323-5)
  • ESD performance
  • HBM: 2000 V
  • RCDM: 1000 V

Circuit Diagram

Design Resources

Top

Technical Documentation

Product Specifications

Description Version Size
pdf
DS5579: Watchdog timer circuit
8.0 410 KB

Application Notes

Description Version Size
pdf
AN2841: LED dimming implemented on STM32™ microcontroller
1.3 782 KB

Technical Notes & Articles

Description Version Size
pdf
TN0941: Reset and supervisor ICs: frequently asked questions (FAQ)
1.0 329 KB

User Manual

Description Version Size
pdf
UM0574: STEVAL-ILL015V1 - LED dimmer demonstration board based on the STP24DP05 and STM32™
1.4 662 KB

Publications and Collaterals

Flyer

Description Version Size
pdf
Resets and supervisors - portfolio overview
1,345 KB
pdf
STWD100
1.0 717 KB

Sample & Buy

Top
Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Automotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STWD100NPWY3FActiveSOT23-5LTape And Reel-40125_Free Samples.52Distributor reported inventory date: 2014-08-28
Distributor NameRegionStockMin. order
P&SOrder NowASIA/PACIFIC19841
RS COMPONENTSOrder NowEUROPE15855
DIGIKEYOrder NowWORLDWIDE17021
MOUSEROrder NowWORLDWIDE41151
Ecopack2PDF
XML
STWD100NWWY3FActiveSOT23-5LTape And Reel-40125_-.517No availability reported, please contact our Sales officeEcopack2PDF
XML
STWD100NYWY3FActiveSOT23-5LTape And Reel-40125_-.52Distributor reported inventory date: 2014-08-28
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA89213000
AVNETOrder NowAMERICA38880
P&SOrder NowASIA/PACIFIC42281
ANGLIA LiveOrder NowEUROPE330003000
ARROWOrder NowEUROPE811000
RS COMPONENTSOrder NowEUROPE33455
DIGIKEYOrder NowWORLDWIDE119231
FUTUREOrder NowWORLDWIDE240003000
MOUSEROrder NowWORLDWIDE108301
Ecopack2PDF
XML
STWD100PYW83FActiveSOT323-5LTape And Reel-40125_-.52Distributor reported inventory date: 2014-08-28
Distributor NameRegionStockMin. order
DIGIKEYOrder NowWORLDWIDE14461
MOUSEROrder NowWORLDWIDE89851
Ecopack2PDF
XML
STWD100YNPWY3FActiveSOT23-5LTape And Reel-40125Yes-.62Distributor reported inventory date: 2014-08-28
Distributor NameRegionStockMin. order
DIGIKEYOrder NowWORLDWIDE29761
MOUSEROrder NowWORLDWIDE28781
Ecopack2PDF
XML
STWD100YNWWY3FActiveSOT23-5LTape And Reel-40125Yes-.621No availability reported, please contact our Sales officeEcopack2PDF
XML
STWD100YNYWY3FActiveSOT23-5LTape And Reel-40125Yes-.62Distributor reported inventory date: 2014-08-28
Distributor NameRegionStockMin. order
DIGIKEYOrder NowWORLDWIDE25471
MOUSEROrder NowWORLDWIDE29211
Ecopack2PDF
XML

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Feedback Form
Customer Feedback