MAX800MCPE Maxim Integrated Products, MAX800MCPE Datasheet - Page 15

• Manufacturer Part Number: MAX800MCPE
• Description: IC MPU SUPERVISORY CIRCUIT 16DIP
• Manufacturer: Maxim Integrated Products
• Type: Battery Backup Circuitr

Specifications of MAX800MCPE

• Number Of Voltages Monitored: 1
• Output: Open Drain, Push-Pull
• Reset: Active High/Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 4.4V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 16-DIP (0.300", 7.62mm)
• Monitored Voltage: 0 V to 5.5 V
• Output Type: Active High, Active Low, Open Drain
• Manual Reset: Not Resettable
• Watchdog: Watchdog
• Battery Backup Switching: Backup
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 0 V
• Supply Current (typ): 100 uA
• Maximum Power Dissipation: 842 mW
• Maximum Operating Temperature: + 70 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: 0 C
• Power Fail Detection: Yes
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

The V
the battery switchover comparator and should not
exceed 0.03V/µs. A standard rule of thumb for filter
capacitance on most regulators is on the order of 100µF
per amp of current. When the power supply is shut off or
the main battery is disconnected, the associated initial
V
The V
nentially, which more than satisfies the maximum fall-time
requirement.
A way to help the watchdog timer keep a closer watch
on software execution involves setting and resetting the
watchdog input at different points in the program,
rather than “pulsing” the watchdog input high-low-high
or low-high-low. This technique avoids a “stuck” loop
where the watchdog timer continues to be reset within
the loop, keeping the watchdog from timing out. Figure
14 shows an example flow diagram where the I/O dri-
ving the watchdog input is set high at the beginning of
the program, set low at the beginning of every subrou-
tine or loop, then set high again when the program
returns to the beginning. If the program should “hang”
in any subroutine, the I/O is continually set low and the
watchdog timer is allowed to time out, causing a reset
or interrupt to be issued.
CC
fall rate is just the inverse or 1A/100µF = 0.01V/µs.
CC
CC
fall rate decreases with time as V
fall time is limited by the propagation delay of
Watchdog Software Considerations
______________________________________________________________________________________
Maximum V
Microprocessor Supervisory Circuits
CC
CC
Fall Time
falls expo-
Figure 14. Watchdog Flow Diagram
OR PROGRAM LOOP
SUBROUTINE
SET WDI
RETURN
START
LOW
HIGH
END
WDI
SET
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