MAX6715AUTTWD4+T Maxim Integrated, MAX6715AUTTWD4+T Datasheet - Page 13
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MAX6715AUTTWD4+T
Manufacturer Part Number
MAX6715AUTTWD4+T
Description
Supervisory Circuits Dual/Triple Ultra-Low-Voltage SOT23 N
Manufacturer
Maxim Integrated
Series
MAX6715A, MAX6716A, MAX6717A, MAX6718A, MAX6719A, MAX6720A, MAX6721A, MAX6722A, MAX6723A, MAX6724A, MAX6725A, MAX6726A, MAX6727A, MAX6728A, MAX6729A, MAX6797Ar
Datasheet
1.MAX1180ECMTD.pdf
(18 pages)
Specifications of MAX6715AUTTWD4+T
Number Of Voltages Monitored
2
Monitored Voltage
1.8 V to 5 V, 0.9 V to 3.3 V
Undervoltage Threshold
4.5 V, 3 V
Output Type
Active Low, Open Drain
Manual Reset
Resettable
Watchdog
No Watchdog
Battery Backup Switching
No Backup
Supply Voltage - Max
5.5 V
Chip Enable Signals
No
Maximum Power Dissipation
696 mW
Power Fail Detection
No
Supply Current (typ)
15 uA
Supply Voltage - Min
0.8 V
magnitude indicated (reset threshold overdrive). The
graph shows the maximum pulse width that a negative-
going V
a reset pulse to be issued. As the amplitude of the tran-
sient increases (i.e., goes farther below the reset
threshold), the maximum allowable pulse width
decreases. A 0.1µF bypass capacitor mounted close to
the V
Setting and resetting the watchdog input at different
points in the program, rather than “pulsing” the watch-
dog input high-low-high or low-high-low, helps the
watchdog timer to closely monitor software execution.
This technique avoids a “stuck” loop where the watch-
dog timer continues to be reset within the loop, keeping
the watchdog from timing out. Figure 6 shows an exam-
ple flow diagram where the I/O driving the watchdog
input is set high at the beginning of the program, set low
at the beginning of every subroutine 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
CC
pin provides additional transient immunity.
Watchdog Software Considerations
transient may typically have without causing
Dual/Triple, Ultra-Low-Voltage, SOT23 µP
______________________________________________________________________________________
Figure 6. Watchdog Flow Diagram
Supervisory Circuits
SUBROUTINE
COMPLETED
SUBROUTINE OR
PROGRAM LOOP
SET WDI LOW
PROGRAM
SET WDI
RETURN
START
CODE
HIGH
SUBROUTINE
HANG IN
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