ATA5021 Datasheet, PDF (1/13 Pages) ATMEL Corporation – Low Current Consumption: IVDD < 25 μA

Features
• Low Current Consumption: I_VDD < 25 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
1. Description
The digital window watchdog timer, ATA5021, is designed in Atmel^®’s state-of-the-art
0.8 µm SOI technology SMART-I.S.^™1. In applications 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 ATA5021 offers a complete monitoring solution for micro-systems in
automotive and industrial applications.
Digital Window
Watchdog Timer
ATA5021
9145D–AUTO–05/10