• 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
• Single Wake-up Input
• Reset Output
• Enable Output
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.