LTC2938_15 datasheet(9/20 Pages) LINER

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LTC2938/LTC2939

293839ff

TIMING DIAGRAM

Vn Monitor Timing

Reset and Watchdog Timing

RST

WDO

WDI

293839 TD02

tRST

tWD

POWER-ON RESET

FOLLOWED BY RESET

CAUSED BY

UNDERVOLTAGE EVENT.

WATCHDOG OUTPUT SET

HIGH, WATCHDOG INPUT =

DON’T CARE

WATCHDOG INPUT NOT TOGGLED,

WATCHDOG TIMER EXPIRES, WATCHDOG

OUTPUT PULLS LOW. RESET OUTPUT

PULLS LOW FOR ONE RESET TIMEOUT

PERIOD.

WATCHDOG INPUT REMAINS UNTOGGLED,

WATCHDOG OUTPUT REMAINS LOW,

RESET OUTPUT PULLS LOW AGAIN AFTER

ONE WATCHDOG TIMEOUT PERIOD.

WATCHDOG OUTPUT CLEARED BY

UNDERVOLTAGE EVENT.

WATCHDOG INPUT NOT

TOGGLED, WATCHDOG

TIMER EXPIRES,

WATCHDOG OUTPUT

PULLS LOW. RESET

OUTPUT PULLS LOW.

WATCHDOG OUTPUT

LOW TIME SHORTENED

BY UNDERVOLTAGE

EVENT DURING RESET

TIMEOUT.

WATCHDOG INPUT NOT

TOGGLED, WATCHDOG

TIMER EXPIRES, WATCHDOG

OUTPUT PULLS LOW. RESET

OUTPUT PULLS LOW.

WATCHDOG OUTPUT NOT

CLEARED BY WATCHDOG

INPUT DURING RESET

TIMEOUT. AFTER RESET

COMPLETED, WATCHDOG

INPUT CLEARS WATCHDOG

OUTPUT.

tRST

293839 TD01

VRT

RST

tUV

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