U5020M Datasheet

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Features

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Low Current Consumption: I

< 100 碌A(chǔ)

RC Oscillator

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

鈥淪hort鈥?Trigger Window for Active Mode

鈥淟ong鈥?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

U5020M

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.

Rev. 4755A鈥揂UTO鈥?1/03

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