U5020M Datasheet, PDF (1/10 Pages) TEMIC Semiconductors – Digital Window Watchdog Timer

Features
• Low Current Consumption: I_DD < 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