MAX6361 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX6361

SOT23, Low-Power µP Supervisory Circuits with Battery Backup

Maxim Integrated 

SOT23, Low-Power µP Supervisory Circuits

with Battery Backup

Watchdog Software Considerations

(MAX6362 Only)

To help the watchdog timer monitor software execution

more closely, set and reset the watchdog input at dif-

ferent points in the program, rather than “pulsing” the

watchdog input low-high-low. This technique avoids a

“stuck” loop, in which the watchdog timer would contin-

ue to be reset within the loop, keeping the watchdog

from timing out. Figure 2 shows an example of a flow

diagram where the I/O driving the WDI is set low at the

beginning of the program, set high at the beginning of

every subroutine or loop, then set low again when the

program returns to the beginning. If the program

should “hang” in any subroutine, the problem would

quickly be corrected, since the I/O is continually set low

and the watchdog timer is allowed to time out, trigger-

ing a reset.

START

SET

WDI

LOW

SUBROUTINE

OR PROGRAM LOOP

SET WDI

HIGH

RETURN

END

Figure 2. Watchdog Flow Diagram

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