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U5020M-FP

Digital Window Watchdog Timer

Atmel Corporation 

Features

• Low Current Consumption: IDD < 100 µA

• RC Oscillator

• Internal Reset During Power-up and Supply Voltage Drops (POR)

• “Short” Trigger Window for Active Mode

“Long” Trigger Window for Sleep Mode

• Cyclical Wake-up of the Microcontroller in Sleep Mode

• Trigger Input

• Six Wake-up Inputs

• Reset Output

• Enable Output

Digital Window

Watchdog Timer

Description

The digital window watchdog timer, U5020M, is a CMOS integrated circuit. In applica-

tions where safety is critical, it is especially important to monitor the microcontroller.

Normal microcontroller operation is indicated by a cyclically transmitted trigger signal,

which is received by a window watchdog timer within a defined time window.

A missing or a wrong trigger signal causes the watchdog timer to reset the microcon-

troller. The IC is tailored for microcontrollers which can work in both full-power and

sleep mode. With an additional voltage monitoring (power-on reset and supply voltage

drop reset), the U5020M offers a complete monitoring solution for microsystems in

automotive and industrial applications.

U5020M

Rev. 4755A–AUTO–11/03

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