CS8151

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6

TIMING DIAGRAMS

Watchdog

Pulse Width

RESET

Wake Up

WDI

Wake Up

Duty Cycle = 50%

Power Up

Sleep Mode

Normal Operation with Varying Watchdog Signal

RESET High

to Wake Up

Delay Time

POR

Figure 2. Power Up, Sleep Mode and Normal Operation

Figure 3. Error Condition: Watchdog Remains Low and a RESET Is Issued

RESET

Wake Up

WDI

POR

RESET High

to Wake Up

Delay Time

RESET Delay Time

RESET High

to Wake Up

Delay Time

Wake Up

Period

POR

RESET

Wake Up

WDI

Watchdog Pulse Width

RTL

POR

Power Down

Wake Up Period

Figure 4. Power Down and Restart Sequence