u5020m ATMEL Corporation, u5020m Datasheet - Page 6

• Manufacturer Part Number: u5020m
• Description: U5020m Digital Window Watchdog Timer
• Manufacturer: ATMEL Corporation

Figure 4-4.
Figure 4-5.
6
U5020M
Trigger
Enable
Reset out
Wake-up
Mode
Trigger
Enable
Mode
Reset out
V
DD
Pulse Diagram of a Correct Trigger Sequence During the Short Watchdog Time
Pulse Diagram of the Long Watchdog Time
Figure 4-5
during the enable time, t
The watchdog can be switched back from the long to the short watchdog mode with a low poten-
tial at the mode pin (pin 12).
shows the switch-over from the short to the long watchdog mode. The wake-up signal
t
2
t
0
5
t
, activates a reset pulse, t
1
t
4
t
2
6
.
t
t
3
trig
t
5
t
6
t
t
1
2
Pins 3 to 8
Pin 12
Pin 11
Pin 10
Pin 9
Pin 13
Pin 10
Pin 12
Pin 11
Pin 9
4755B–AUTO–11/05