MAX6884ETP MAXIM [Maxim Integrated Products], MAX6884ETP Datasheet - Page 20

• Manufacturer Part Number: MAX6884ETP
• Description: EEPROM-Programmable, Hex Power-Supply Supervisory Circuits
• Manufacturer: MAXIM [Maxim Integrated Products]

The MAX6884/MAX6885 offer a separate output for the
watchdog timer system. WDO is active low and program-
mable for open-drain or weak pullup. Program WDO to
assert RESET when the watchdog timer expires. See the
Configuring the Watchdog Timer section for a complete
description of the watchdog timer system.
A watchdog timer monitors microprocessor (µP) soft-
ware execution for a stalled condition and resets the µP
EEPROM-Programmable, Hex
Power-Supply Supervisory Circuits
Figure
20
______________________________________________________________________________________
4. Watchdog Timing Diagrams
Configuring the Watchdog Timer
V
CC
*t
V
OR IN1–IN4
WDI
CC
OR IN1–IN4
RESET
IS THE INITIAL WATCHDOG TIMEOUT PERIOD.
RESET
WDO
WDI
WDI
WDO
2.5V
2.5V
t
t
D-PO
D-PO
WDO
t
RP
t
RP
*t
RESET NOT DEPENDENT ON WDO
*t
WDI
WDI
if it stalls. The output of the watchdog timer (WDO) con-
nects to the reset input or a nonmaskable interrupt of
the µP. Program R15h to configure the watchdog timer
functions (see
independent initial and normal watchdog timeout peri-
ods between 6.25ms and 102.4s (see
The initial watchdog timeout period (t
immediately after power-up, after a reset event takes
place, after enabling the watchdog timer, or after the
watchdog timer expires. The initial watchdog timeout
period allows the µP to perform its initialization process.
WDO CONNECTED TO MR.
t
WD
t
WD
Table
t
RP
8). The watchdog timer features
*t
WDI
*t
WDI
Figure
WDI
) is active
4).