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U5021M Datasheet, PDF (1/11 Pages) ATMEL Corporation – DIGITAL WINDOW WATCHDOG TIMER | |||
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Features
⢠Low Current Consumption: IDD < 100 µA
⢠RC Oscillator
⢠Internal Reset During Power-up and Supply Voltage Drops (POR)
⢠âShortâ Trigger Window for Active Mode,
âLongâ Trigger Window for Sleep Mode
⢠Cyclical Wake-up of the Microcontroller in Sleep Mode
⢠Trigger Input
⢠Single Wake-up Input
⢠Reset Output
⢠Enable Output
Digital Window
Watchdog Timer
Description
The digital window watchdog timer, U5021M, 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 U5021M offers a complete monitoring solution for microsystems in
automotive and industrial applications.
U5021M
Rev. 4756CâAUTOâ09/04
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