U5020M 데이터 시트보기 (PDF) - Atmel Corporation

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U5020M

Digital Window Watchdog Timer

Atmel Corporation 

Figure 4-4. Pulse Diagram of a Correct Trigger Sequence During the Short Watchdog Time

VDD

Reset out

Mode

t0

t1

t2

t3

t2

Trigger

ttrig

Enable

Pin 13

Pin 10

Pin 12

Pin 11

Pin 9

Figure 4-5 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 poten-

tial at the mode pin (pin 12).

Figure 4-5. Pulse Diagram of the Long Watchdog Time

Reset out

t6

t1

Pin 10

Wake-up

Pins 3 to 8

Mode

t4

t5

Pin 12

t2

Trigger

Pin 11

Enable

Pin 9

6 U5020M

4755B–AUTO–11/05

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