ST STWD100NYWY3F

Схема сторожевого таймера1

Overview

The STWD100NYWY3F 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 STWD100NYWY3F 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 STWD100NYWY3F 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.

Features

• Operating temperature range: –40 to 125 °C

• Packages: SOT23-5 and SC70-5 (SOT323-5)

• ESD performance

-HBM: 2000 V

-CDM: 1000 V

• Automotive qualified

• 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 WDO output

Applications

• Networking

• Medical equipment

• UPS (uninterruptible power supply)

• Automotive

• Telecommunications

• Alarm systems

• Industrial equipment