ATA5021 ATMEL, ATA5021 Datasheet - Page 3

• Manufacturer Part Number: ATA5021
• Description: Digital Window Watchdog Timer
• Manufacturer: ATMEL

2. Pin Configuration
Figure 2-1.
Table 2-1.
9145D–AUTO–05/10
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Pin
1
2
3
4
5
6
7
8
Pinning SO8
Pin Description
Symbol
RESET
MODE
WUP
GND
OSC
TRG
ENA
VDD
Function
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.
Trigger input (pull-up resistor)
It is connected to the microprocessor’s trigger signal.
Mode input (pull-up resistor)
The processor’s mode signal initiates the switchover between the long and the short watchdog time.
Enable output (push-pull)
It is used for the control of peripheral components. It is activated after the processor triggers three times
correctly.
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.
Supply voltage
Ground, reference voltage
RC oscillator
MODE
TRIG
WUP
ENA
1
2
3
4
8
7
6
5
OSC
GND
VDD
RESET
ATA5021
3