Datasheet
3Atmel ATA5021 [DATASHEET]
9145G–AUTO–09/12
2. Pin Configuration
Figure 2-1. Pinning SO8
Table 2-1. Pin Description
Pin Symbol Function
1 WUP
Wake-up input (pull-down resistor)
There is one digitally debounced wake-up input. During the long watchdog window, each signal
slope at the input initiates a reset pulse at pin 5.
2 TRG
Trigger input (pull-up resistor)
It is connected to the microprocessor’s trigger signal.
3 MODE
Mode input (pull-up resistor)
The processor’s mode signal initiates the switchover between the long and the short watchdog
time.
4 ENA
Enable output (push-pull)
It is used for the control of peripheral components. It is activated after the processor triggers
three times correctly.
5 RESET
Reset output (open drain)
Resets the processor in the case of under-voltage condition, a wrong trigger event or if a wake-
up event occurs during long watchdog period.
6 VDD Supply voltage
7 GND Ground, reference voltage
8 OSC RC oscillator
5
6
7
8
4
3
2
1
RESET
VDD
GND
OSC
ENA
MODE
TRIG
WUP