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參數(shù)資料
| 型號(hào)： | MAX808NMJA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | Interface IC |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, CDIP8 |
| 封裝： | 0.300 INCH, CERDIP-8 |
| 文件頁(yè)數(shù)： | 12/12頁(yè) |
| 文件大?。?/td> | 91K |
| 代理商： | MAX808NMJA |
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12
__________________Maxim Integrated Produc ts, 120 S an Gabriel Drive, S unnyvale, CA 94086 (408) 737-7600
1996 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
M
8-Pin μP S upervisory Circ uits
with ±1.5% Reset Ac c urac y
Watc hdog S oftware Considerations
To help the watchdog timer keep a closer watch on
software execution, you can set and reset the watch-
dog 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 9 shows a sample flow diagram where the I/O
driving the watchdog input is set high at the beginning
of the program, low at the beginning of every subrou-
tine or loop, then high again when the program returns
to the beginning. If the program should “hang” in any
subroutine, the I/O would be continually set low and the
watchdog timer would be allowed to time out, causing a
reset or interrupt to be issued.
Maximum V
CC
Fall T ime
The V
CC
fall time is limited by the propagation delay of
the battery switchover comparator and should not
exceed 0.03V/μs. A standard rule for filter capacitance
on most regulators is around 100μF per Ampere of cur-
rent. When the power supply is shut off or the main bat-
tery is disconnected, the associated initial V
CC
fall rate
is just the inverse, or 1A/100μF = 0.01V/μs.
START
SET
WDI
LOW
SUBROUTINE
OR PROGRAM LOOP,
SET WDI
HIGH
RETURN
END
Figure 9. Watchdog Flow Diagram
_________________Pin Configurations
WDI
RESET
RESET
GND
1
2
8
7
OUT
BATT
LOWLINE
V
CC
MAX801
DIP/SO
3
4
6
5
CE IN
RESET
CE OUT
GND
1
2
8
7
OUT
BATT
LOWLINE
V
CC
MAX808
DIP/SO
TOP VIEW
3
4
6
5
___________________Chip Information
TRANSISTOR COUNT: 922
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