MAX6318LHUK25AW-T Просмотр технического описания (PDF) - Maxim Integrated

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MAX6318LHUK25AW-T

5-Pin µP Supervisory Circuits with Watchdog and Manual Reset

Maxim Integrated 

5-Pin µP Supervisory Circuits with

Watchdog and Manual Reset

Figure 10 shows an example of a flow diagram where

the I/O driving the watchdog input is set high at the

beginning of the program, set low at the end of every

subroutine or loop, then set high again when the pro-

gram returns to the beginning. If the program should

hang in any subroutine, the problem would be quickly

corrected, since the I/O is continually set low and the

watchdog timer is allowed to time out, causing a reset

or interrupt to be issued. As described in the Watchdog

Input Current section, this scheme results in higher time

average WDI current than does leaving WDI low for the

majority of the timeout period and periodically pulsing it

low-high-low.

START

SET WDI

HIGH

PROGRAM

CODE

SUBROUTINE OR

PROGRAM LOOP

SET WDI LOW

POSSIBLE

INFINITE LOOP PATH

RETURN

__________________Pin Configurations

TOP VIEW

RESET 1

5 VCC RESET 1

5 VCC

MAX6316

GND 2 MAX6320

MAX6317

GND 2

MR 3

4 WDI

SOT23-5

MR 3

4 WDI

SOT23-5

Figure 10. Watchdog Flow Diagram

Typical Operating Circuit

VIN

MANUAL

RESET

VCC

RESET

MAX6316

MR

WDI

GND

VCC

RESET

µP

I/O

GND

RESET 1

5 VCC RESET 1

5 VCC

MAX6318

GND 2 MAX6321

MAX6319

GND 2 MAX6322

RESET 3

4 WDI RESET 3

4 MR

SOT23-5

SOT23-5

______________________________________________________________________________________ 11

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