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| 型號(hào)： | SP691A |
| 英文描述： | Low Power Microprocessor Supervisory with Battery Switch-Over(低功耗，微處理器監(jiān)控電路（帶電池開(kāi)關(guān)）) |
| 中文描述： | 低功耗微處理器監(jiān)控與電池開(kāi)關(guān)過(guò)（低功耗，微處理器監(jiān)控電路（帶電池開(kāi)關(guān)）） |
| 文件頁(yè)數(shù)： | 19/23頁(yè) |
| 文件大?。?/td> | 223K |
| 代理商： | SP691A |
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SP691A DS/04 SP691A/693A/800L/800M Low Power Microprocessor Supervisor with Battery Switch-Over Copyright 2000 Sipex Corporation
19
Figure 30. Watchdog Flow Diagram
START
SET
WDI
LOW
SUBROUTINE
OR PROGRAM LOOP
SET WDI
HIGH
RETURN
END
Watchdog Software Considerations
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 30
shows an example 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 subrouting 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.
Maximum V
CC
Fall Time
The V
CC
fall time is limited by the propagation
delay of the battery switchover comparator and
should not exceed 0.03V/
μ
s. A standard rule of
thumb for filter capacitance on most regulators
is on the order of 100
μ
F per amp of current.
When the power supply is shut off or the main
battery is disconnected, the associated initial
V
CC
fall rate is just the inverse of 1A/100
μ
F =
0.01V/
μ
s. The V
CC
fall rate decreases with time
as V
CC
falls exponentially, which more than
satisfies the maximum fall-time requirement.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP703 | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP703CN | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP703CP | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP703EN | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP703EP | Low Power Microprocessor Supervisory with Battery Switch-Over |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP691A_05 | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP691ACN | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:Evaluation Board Manual |
| SP691ACN/TR | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP691ACN-L | 功能描述:監(jiān)控電路 LW PWR MICRO 5.5V 25mA-250mA BAT SW/OV RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| SP691ACN-L/TR | 功能描述:監(jiān)控電路 LW PWR MICRO 5.5V 25mA-250mA BAT SW/OV RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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