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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
8.0 410 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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TN0941: Reset and supervisor ICs: frequently asked questions (FAQ)
1.0 329 KB

User Manual

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

Presentations & Training Material

Presentations

Description Version Size
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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: 2015-08-01
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA334593000
P&SOrder NowASIA/PACIFIC11401
RS COMPONENTSOrder NowEUROPE29405
DIGIKEYOrder NowWORLDWIDE31961
MOUSEROrder NowWORLDWIDE6171
Ecopack2PDF
XML
STWD100NWWY3FActiveSOT23-5LTape And Reel-40125_Free Samples.517Distributor reported inventory date: 2015-08-01
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA30003000
RS COMPONENTSOrder NowEUROPE298010
DIGIKEYOrder NowWORLDWIDE28671
MOUSEROrder NowWORLDWIDE25781
Ecopack2-
STWD100NYWY3FActiveSOT23-5LTape And Reel-40125_Free Samples.52Distributor reported inventory date: 2015-08-01
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA104303000
AVNETOrder NowAMERICA44650
P&SOrder NowASIA/PACIFIC361
ANGLIA LiveOrder NowEUROPE1230001
ARROWOrder NowEUROPE570000
RS COMPONENTSOrder NowEUROPE31545
DIGIKEYOrder NowWORLDWIDE132641
FUTUREOrder NowWORLDWIDE210003000
MOUSEROrder NowWORLDWIDE244361
Ecopack2PDF
XML
STWD100PYW83FActiveSOT323-5LTape And Reel-40125_Free Samples.52Distributor reported inventory date: 2015-08-01
Distributor NameRegionStockMin. order
Farnell Element14Order NowEUROPE23271
RS COMPONENTSOrder NowEUROPE298010
DIGIKEYOrder NowWORLDWIDE84571
FUTUREOrder NowWORLDWIDE30003000
MOUSEROrder NowWORLDWIDE14951
Ecopack2-
STWD100YNPWY3FActiveSOT23-5LTape And Reel-40125YesFree Samples.62Distributor reported inventory date: 2015-08-01
Distributor NameRegionStockMin. order
Farnell Element14Order NowEUROPE24011
RS COMPONENTSOrder NowEUROPE299010
DIGIKEYOrder NowWORLDWIDE29211
FUTUREOrder NowWORLDWIDE30003000
MOUSEROrder NowWORLDWIDE33681
Ecopack2-
STWD100YNWWY3FActiveSOT23-5LTape And Reel-40125Yes-.621Distributor reported inventory date: 2015-08-01
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA30003000
RS COMPONENTSOrder NowEUROPE299010
DIGIKEYOrder NowWORLDWIDE5451
FUTUREOrder NowWORLDWIDE2301
Ecopack2PDF
XML
STWD100YNYWY3FActiveSOT23-5LTape And Reel-40125Yes-.62Distributor reported inventory date: 2015-08-01
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA27003000
DIGIKEYOrder NowWORLDWIDE7211
FUTUREOrder NowWORLDWIDE30003000
MOUSEROrder NowWORLDWIDE41501
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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