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參數(shù)資料
| 型號： | 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)控與電池開關(guān)過 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 216K |
| 代理商： | SP703EN |
SP703/704DS/07
SP703/704 Low Power Microprocessor Supervisory
11
Copyright 2000 Sipex Corporation
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Using a High Capacity Capacitor
as a Backup Power Source
V
BATT
has the same operating voltage range as
V
CC
, and the battery-switchover threshold volt-
ages are typically +20mV centered at V
BATT
,
allowing use of a capacitor and a simple charg-
ing circuit as a backup source (see
Figure 12)
.
If V
CC
is above the reset threshold and V
BATT
is 0.5V above V
CC
, current flows to V
and
V
CC
from V
BATT
until the voltage at V
BATT
is
less than 0.5V above V
CC
.
Leakage current through the capacitor charging
diode and the
SP703/704
internal power
diode eventually discharges the capacitor to
V
CC
. Also, if V
CC
and V
BATT
start from 0.5V
above the reset threshold and power is lost
at V
CC
, the capacitor on V
BATT
discharges
through V
CC
until V
BATT
reaches the reset
threshold; the
SP703/704
then switches to
battery-backup mode.
Figure 11. Allowable BACKUP-BATTERY Voltages
Figure 10. Input and Output Status in Battery-Backup Mode.
To enter the Battery-Backup mode, V
CC
must be less than the
Reset threshold and less than V
BATT
.
Figure 12. Backup Power Source Using High Capacity
Capacitor
with SP703 and a +5V
±
5% Supply
Figure 13. Backup Power Source Using High Capacity
Capacitor
with SP704 and a +5V
±
10% Supply
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5
5
V
CC
+5V
GND
V
BATT
V
OUT
RESET
CONNECT TO
STATIC RAM
TO
μ
P
0.1F
CONNECT
SP703
V
CC
+5V
GND
V
BATT
V
OUT
RESET
CONNECT TO
STATIC RAM
TO
μ
P
100K
0.1F
CONNECT
SP704
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:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP704 | 制造商:SIPEX 制造商全稱: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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