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| U5021M Datasheet, PDF (6/11 Pages) ATMEL Corporation – DIGITAL WINDOW WATCHDOG TIMER | |||
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Figure 6. Pulse Diagram of a Correct Trigger Sequence During the Short Watchdog Time
VDD
Reset out
Mode
t0
t1
t2
t3
t2
Trigger
Pin 6
Pin 5
Pin 3
Pin 2
Enable
ttrig
Pin 4
Figure 7 shows the switch-over from the short to the long watchdog mode. The wake-up
signal during the enable time, t5, activates a reset pulse, t6.
The watchdog can be switched back from the long to the short watchdog mode with a
low potential at the mode pin (pin 3).
Figure 7. Pulse Diagram of the Long Watchdog Time
Reset out
t6 t1
Pin 5
Wake-up
Mode
t2
Trigger
Pins 1
t4
t5
Pin 3
Pin 2
Enable
Pin 4
6 U5021M
4756CâAUTOâ09/04
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