NCV8508 데이터 시트보기 (PDF) - ON Semiconductor

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NCV8508

5.0 V, 250 mA LDO with Watchdog and RESET

ON Semiconductor 

VIN

RESET

Wakeup

NCV8508

TIMING DIAGRAMS

Wakeup

Duty Cycle = 50%

WDI

VOUT

POR

RESET High

to Wakeup

Delay Time

WDI Pulse Must Occur with Wakeup in

Low State for 50% Duty Cycle.

Reference Figure 17 for Occurrence of

WDI with Wakeup in High State.

Power Up

Microprocessor

Sleep Mode

Normal Operation with Varying Watchdog Signal

Figure 3. Power Up, Sleep Mode and Normal Operation

VIN

RESET

Wakeup

WDI

RESET Delay Time

VOUT

POR

RESET High

to Wakeup

Delay Time

Wakeup

Period

RESET High

to Wakeup

Delay Time

Figure 4. Error Condition: Watchdog Remains Low and a RESET Is Issued

RESET

Wakeup

Wakeup Period

WDI

VOUT

Watchdog

Pulse Width

POR

RESET Threshold

Power Down

Watchdog Pulse Width

POR

Figure 5. Power Down and Restart Sequence

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