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

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デザイン

技術文書

製品スペック
Description バージョン サイズ
DS5579 DS5579: Watchdog timer circuit 10.0 1019 KB
Technical Notes & Articles
Description バージョン サイズ
TN0941 TN0941: Reset and supervisor ICs: frequently asked questions (FAQ) 1.0 328 KB

プレゼンテーション & トレーニング資料

プレゼンテーション
Description バージョン サイズ
VMA automotive applications 1 MB

Publications and Collaterals

フライヤー
Description バージョン サイズ
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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サンプル & 購入

製品型番 パッケージ Packing Type Operating Temperature (°C) (min) Operating Temperature (°C) (max) Marketing Status Unit Price (US$) * 数量 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 サンプル入手 買い物かごに追加 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 サンプル入手 買い物かごに追加 DISTRIBUTOR AVAILABILITY
STWD100NYWY3F SOT23-5L Tape And Reel -40 125 Active 0.52 1000 NEC EAR99 MALAYSIA MORE INFO サンプル入手 買い物かごに追加 DISTRIBUTOR AVAILABILITY
STWD100PYW83F SOT323-5L Tape And Reel -40 125 Active 0.52 1000 NEC EAR99 MALAYSIA MORE INFO サンプル入手 買い物かごに追加 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

品質 & 信頼性

製品型番 Marketing Status パッケージ Grade RoHS Compliance Grade Material Declaration**
STWD100YNYWY3F アクティブSOT23-5L自動車Ecopack3 0 0
STWD100NPWY3F アクティブSOT23-5LIndustrialEcopack3 0 0
STWD100YNWWY3F アクティブSOT23-5L自動車Ecopack3 0 0
STWD100NWWY3F アクティブSOT23-5LIndustrialEcopack3
STWD100NYWY3F アクティブSOT23-5LIndustrialEcopack3
STWD100PYW83F アクティブSOT323-5LIndustrialEcopack3
STWD100YNPWY3F アクティブSOT23-5L自動車Ecopack3
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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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