Watchdog

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

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 EN pin is connected to the internal pull-down resistor. The device is enabled if the EN pin is left floating.

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-pullWDO output
  • Operating temperature range: –40 to 125 °C
  • Packages: SOT23-5 and SC70-5 (SOT323-5)
  • ESD performance
    • HBM: 2000 V
    • RCDM: 1000 V
  • Automotive qualified

电路原理图

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技术文档

产品规格
Description Version Size
DS5579 DS5579: Watchdog timer circuit 10.0 1019 KB
Technical Notes & Articles
Description Version Size
TN0941 TN0941: Reset and supervisor ICs: frequently asked questions (FAQ) 1.0 328 KB

演示和培训资料

简报
Description Version Size
VMA automotive applications 1 MB

出版刊物和宣传资料

宣传册
Description Version Size
Resets and supervisors - portfolio overview 1.0 1 MB
ST automotive solutions - High-performance analog products 1.0 1 MB
Watchdog ICs For automotive applications 487 KB
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样片和购买

型号 Package Packing Type Operating Temperature (°C) (min) Operating Temperature (°C) (max) Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STWD100YNYWY3F SOT23-5L Tape And Reel -40 125 Active 0.62 1000 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
STWD100NPWY3F SOT23-5L Tape And Reel -40 125 Active 0.52 1000 NEC EAR99 MALAYSIA MORE INFO 获取样片 Add to cart DISTRIBUTOR AVAILABILITY
STWD100YNWWY3F SOT23-5L Tape And Reel -40 125 Active 0.621 1000 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
STWD100NWWY3F SOT23-5L Tape And Reel -40 125 Active 0.517 1000 NEC EAR99 MALAYSIA MORE INFO 获取样片 Add to cart DISTRIBUTOR AVAILABILITY
STWD100NYWY3F SOT23-5L Tape And Reel -40 125 Active 0.52 1000 NEC EAR99 MALAYSIA MORE INFO 获取样片 Add to cart DISTRIBUTOR AVAILABILITY
STWD100PYW83F SOT323-5L Tape And Reel -40 125 Active 0.52 1000 NEC EAR99 MALAYSIA MORE INFO 获取样片 Add to cart DISTRIBUTOR AVAILABILITY
STWD100YNPWY3F SOT23-5L Tape And Reel -40 125 Active 0.62 1000 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
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(*) 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

质量和可靠性

型号 Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STWD100YNYWY3F ActiveSOT23-5LAutomotiveEcopack3 0 0
STWD100NPWY3F ActiveSOT23-5LIndustrialEcopack3 0 0
STWD100YNWWY3F ActiveSOT23-5LAutomotiveEcopack3 0 0
STWD100NWWY3F ActiveSOT23-5LIndustrialEcopack3
STWD100NYWY3F ActiveSOT23-5LIndustrialEcopack3
STWD100PYW83F ActiveSOT323-5LIndustrialEcopack3
STWD100YNPWY3F ActiveSOT23-5LAutomotiveEcopack3
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(**) 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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