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STWD100

Watchdog
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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.

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Errata Sheet
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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

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Technical Documentation

Product Specifications

Description Version Size
pdf
DS5579: Watchdog timer circuit
9.0 530 KB

Application Notes

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AN2841: LED dimming implemented on STM32™ microcontroller
1.3 782 KB

Technical Notes & Articles

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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

Presentations & Training Material

Presentations

Description Version Size
pdf
VMA automotive applications
1,366 KB

Publications and Collaterals

Flyer

Description Version Size
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Resets and supervisors - portfolio overview
1,345 KB
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ST automotive solutions - High-performance analog products
1.0 1,323 KB
pdf
Watchdog ICs For automotive applications
487 KB

Sample & Buy

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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: 2016-02-09
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA93223000
P&SOrder NowASIA/PACIFIC11401
RS COMPONENTSOrder NowEUROPE27655
DIGIKEYOrder NowWORLDWIDE51321
MOUSEROrder NowWORLDWIDE35431
Ecopack2PDF
XML
STWD100NWWY3FActiveSOT23-5LTape And Reel-40125_Free Samples.517Distributor reported inventory date: 2016-02-09
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA28933000
RS COMPONENTSOrder NowEUROPE29001
DIGIKEYOrder NowWORLDWIDE26951
MOUSEROrder NowWORLDWIDE22241
Ecopack2-
STWD100NYWY3FActiveSOT23-5LTape And Reel-40125_Free Samples.52Distributor reported inventory date: 2016-02-09
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA1853000
AVNETOrder NowAMERICA156310
P&SOrder NowASIA/PACIFIC361
ANGLIA LiveOrder NowEUROPE958401
ARROWOrder NowEUROPE270000
RS COMPONENTSOrder NowEUROPE22095
DIGIKEYOrder NowWORLDWIDE279341
FUTUREOrder NowWORLDWIDE150003000
MOUSEROrder NowWORLDWIDE126681
Ecopack2PDF
XML
STWD100PYW83FActiveSOT323-5LTape And Reel-40125_Free Samples.52Distributor reported inventory date: 2016-02-09
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA25493000
Farnell Element14Order NowEUROPE20141
RS COMPONENTSOrder NowEUROPE29301
DIGIKEYOrder NowWORLDWIDE102361
MOUSEROrder NowWORLDWIDE44211
Ecopack2-
STWD100YNPWY3FActiveSOT23-5LTape And Reel-40125Yes-.62Distributor reported inventory date: 2016-02-09
Distributor NameRegionStockMin. order
Farnell Element14Order NowEUROPE23231
RS COMPONENTSOrder NowEUROPE29201
MOUSEROrder NowWORLDWIDE33191
Ecopack2-
STWD100YNWWY3FActiveSOT23-5LTape And Reel-40125Yes-.621Distributor reported inventory date: 2016-02-09
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA30003000
RS COMPONENTSOrder NowEUROPE29101
DIGIKEYOrder NowWORLDWIDE29981
FUTUREOrder NowWORLDWIDE31951
MOUSEROrder NowWORLDWIDE44121
Ecopack2PDF
XML
STWD100YNYWY3FActiveSOT23-5LTape And Reel-40125Yes-.62Distributor reported inventory date: 2016-02-09
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA24193000
ARROWOrder NowEUROPE30000
DIGIKEYOrder NowWORLDWIDE43651
MOUSEROrder NowWORLDWIDE60001
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.
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