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SGM819S - Watchdog Timer

Datasheet Summary

Description

The SGM819S is an independent watchdog timer circuit.

It can be used to guard against system failures due to hardware types like peripherals errors and bus occupancy or software types like infinite code execution in a loop.

This device has a WDI input and an nWDO output.

Features

  • Current Consumption: 3.5μA (TYP).
  • Six Selectable Watchdog Timeout Periods: 3.4ms, 6.8ms, 108.8ms, 1.7s, 7.0s and 27.9s.
  • Two Selectable Watchdog Active Time: 27.2ms and 217.6ms.
  • Watchdog Timer Accuracy: ±20%.
  • Active-Low Enable Input.
  • Open-Drain nWDO Output.
  • Available in a Green SOT-23-5 Package.

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Datasheet preview – SGM819S

Datasheet Details

Part number SGM819S
Manufacturer SG Micro
File Size 479.33 KB
Description Watchdog Timer
Datasheet download datasheet SGM819S Datasheet
Additional preview pages of the SGM819S datasheet.

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Full PDF Text Transcription

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SGM819S Watchdog Timer Circuit GENERAL DESCRIPTION The SGM819S is an independent watchdog timer circuit. It can be used to guard against system failures due to hardware types like peripherals errors and bus occupancy or software types like infinite code execution in a loop. This device has a WDI input and an nWDO output. In normal conditions, the WDI is toggled within the preset timeout period called tWD in order to clear the watchdog timer. However, if an error event occurs and the watchdog timer is not reset within tWD, the nWDO is asserted to send out the alarm signal. The SGM819S has an enable pin (nEN) to control the device to turn on/off the watchdog function. To turn on the watchdog function, just connect nEN pin which has a built-in pull-down resistor to GND or leave it floating.
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