6

U5020M

4755A–AUTO–11/03

Figure 6. Pulse Diagram of a Correct Trigger Sequence During the Short Watchdog Time

Figure 7 shows the switch-over from the short to the long watchdog mode. The wake-up

signal during the enable time, t

The watchdog can be switched back from the long to the short watchdog mode with a

low potential at the mode pin (pin 12).

Figure 7. Pulse Diagram of the Long Watchdog Time

V

DD

Reset out

Mode

Trigger

Enable

t

0

Pin 9

Pin 11

Pin 12

Pin 10

Pin 13

t

1

t

2

t

3

t

2

t

trig

t

2

Wake-up

Enable

Mode

Trigger

Reset out

Pin 9

Pin 11

Pin 12

Pins 3 to 8

Pin 10

t

4

t

5

t

6

t

1