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參數(shù)資料
| 型號(hào)： | SP703EN |
| 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(kāi)關(guān)過(guò) |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大小： | 216K |
| 代理商： | SP703EN |
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SP703/704DS/07
SP703/704 Low Power Microprocessor Supervisory
9
Copyright 2000 Sipex Corporation
THEORY OF OPERATION
Reset Output
The microprocessor's (
μ
P's) reset input starts
the
μ
P in a known state. When the
μ
P is in an
unknown state, it should be held in reset. The
SP703/704
assert reset during power-up and
prevent code execution errors during power-
down or brownout conditions.
On power-up, once V
reaches 1V, RESET is
guaranteed to be a logic low. As V
rises,
RESET remains low. When V
exceeds the
reset threshold, RESET will remain low for
200ms,
Figure 9
. If a brownout condition
occurs and V
dips below the reset threshold,
RESET is triggered. Each time RESET is trig-
gered, it stays low for the reset pulse width
interval. If a brownout condition interrupts a
previously initiated reset pulse, the reset pulse
continues for another 200ms. On power-down,
once V
goes below the threshold, RESET is
guaranteed to be logic low until V
drops
below 1V. RESET is also triggered by a
manual reset
FEATURES
The
SP703/704
devices provide four key func-
tions:
1. A battery backup switching for CMOS RAM,
CMOS microprocessors, or other logic.
2. A reset output during power-up, power-down
and brownout conditions.
3. A reset pulse if the manual reset has been
pulled below 0.8V for at least 150ns.
4. A 1.25V threshold detector for power-fail
warning, low battery detection, or to monitor a
power supply other than +5V.
The
SP703/704
devices differ only in their
supply voltage monitor level. The
SP703
generates a reset when V
drops below 4.65V
while the
SP704
generates a reset below 4.4V.
The
SP703/704
devices are ideally suited for
applications in automotive systems, intelligent
instruments, and battery-powered computers and
controllers. All designs into an environment
where it is critical to monitor the power supply
to the
μ
P and its related digital components will
find the
SP703/704
ideal.
Figure 8. Typical Operating Circuit
GND
GND
RESET
NMI
V
CC
RESET
PFO
MR
V
OUT
BUS
V
CC
GND
V
BATT
R
2
R
1
Unregulated
DC
Regulated +5V
V
CC
0.1
μ
F
PFI
L3.6V
Battery
μ
P
RAM
Pushbutton
Switch
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP703EP | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP704 | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP704CN | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP704CP | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP704EN | 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 |
|---|---|
| SP703EN-L | 制造商:Exar Corporation 功能描述:SUPERVISORY CIRCUIT LOW POWER 703 |
| SP703EP | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP704 | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP7041-HAR | 制造商:Methode Electronics Inc 功能描述: |
| SP7041-JN | 制造商:Methode Electronics Inc 功能描述: |
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