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參數(shù)資料
| 型號： | SP791EN |
| 英文描述： | Low Power Microprocessor Supervisory with Battery Switch-Over |
| 中文描述： | 低功耗微處理器監(jiān)控與電池開關過 |
| 文件頁數(shù)： | 8/19頁 |
| 文件大?。?/td> | 202K |
| 代理商： | SP791EN |
SP791DS/08 SP791 Low Power Microprocessor Supervisory with Battery Switch-Over
Copyright 2000 Sipex Corporation
8
2) Manual-Reset input
Manually resets
RESET output
3) Power Fail Comparator
Provides for power-
fail warning and low-battery detection, or
monitors another power supply.
4) Watchdog function
Monitors
μ
P activity
where the watchdog output goes to a logic
LOW state if the watchdog input is not toggled
for a period greater than the timeout period.
5) Internal switch
Switches over from V
to
V
if the V
falls below the reset thresh-
old and below V
BATT
.
MANUAL RESET INPUT
Many microprocessor or microcontroller prod-
ucts include manual-reset capability, allowing
the operator or test technician to initiate a reset.
The Manual Reset Input (MR) can be connected
directly to a switch, without an external pull-up
resistor. It connects to a 1.25V comparator, and
has an internal pull-up to V
OUT
as shown in
Fig-
ure 1
. The propagation delay from asserting MR
to RESET being asserted is 7us typical. Pulsing
FEATURES
The
SP791
is a microprocessor (
μ
P) supervi-
sory circuit that monitors the power supplied to
digital circuits such as microprocessors,
microcontrollers, or memory. The
SP791
is an
ideal solution for portable, battery-powered
equipment that require power supply monitor-
ing. The
SP791
watchdog functions will con-
tinuously oversee the operational status of a sys-
tem. Implementing the
SP791
will reduce the
number of components and overall complexity
in a design that requires power supply monitor-
ing circuitry. The operational features and ben-
efits of the
SP791
are described in more detail
below.
THEORY OF OPERATION
The
SP791
is a complete
μ
P supervisor IC and
provides the following main functions:
1)
μ
P reset
RESET output is asserted during
power fluctuations such as power-up, power-
down, and brown out conditions, and is guar-
anteed to be in the correct state for V
CC
down
to 1V.
Figure 2. Manual-Reset Timing Diagram
Typical Operating Circuit
Figure 3. Diode "OR" connections allow multiple reset
sources to connect to MR.
C orporation
V
cc
V
BATT
BATT
SWT
V
OUT
CE
OUT
MR
CE
IN
PFI
PFO
GND
WDI
LOWLINE
RESET
WDO
UNREGULATED
OTHER SYSTEM
0.47F
ADDRESS
0.1
μ
F
+5V
0.1
μ
F
CMOS
AO-P
I/O
NMI
RESET
INT
UNREGULATED
MANUAL RESET
OTHER
RESET
SOURCES
*
DIODES NOT REQUIRED ON OPEN-DRAIN OUTPUTS
*
*
MR
C orporation
MR
RESET
CE
IN
0V
CE
OUT
25
μ
s
MIN
7
μ
s
TYP
15
μ
s
TYP
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相關代理商/技術參數(shù) |
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|---|---|
| SP791EN-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)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| SP791EN-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)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| SP791EP | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP7AL | 制造商:Hubbell Wiring Device-Kellems 功能描述:ALMOND PAINTED STEEL SGL. RECEPTACLE |
| SP7B10/E12/27K | 制造商:Eiko 功能描述:Bullet Shape Decorative 7W/120V/2700K Compact Fluorescent Lamp 制造商:Eiko Ltd 功能描述:7W BULLET SHAPE 27K 120V E12 BASE |
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