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| 型號： | SP805MCP |
| 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 |
| 文件大小： | 631K |
| 代理商： | SP805MCP |
SP690A/692ADS/08 SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
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 charging
circuit as a backup source (see
Figure 16)
.
If V
CC
is above the reset threshold and V
BATT
is 0.5V above V
CC
, current flows to VOUT 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
SP690A/SP802L/SP805L
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
SP690A/SP802L/SP805L
then switches to
battery-backup mode.
Figure 15. Allowable BACKUP-BATTERY Voltages
Figure 14. 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 16. Backup Power Source Using High Capacity
Capacitor
with SP690A/802L/805L and a +5V
±
5% Supply
Figure 17. Backup Power Source Using High Capacity
Capacitor
with SP692A/802M/805M and a +5V
±
10% Supply
V
CC
+5V
GND
V
BATT
V
OUT
RESET
(RESET)*
CONNECT TO
STATIC RAM
TO
μ
P
0.1F
CONNECT
*( ) SP805L only
V
CC
+5V
GND
V
BATT
V
OUT
RESET
(RESET)*
CONNECT TO
STATIC RAM
TO
μ
P
100K
0.1F
CONNECT
*( ) SP805M only
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP805MEN | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP690R | 3.0V/3.3V Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP690RCN | 3.0V/3.3V Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP690RCP | 3.0V/3.3V Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP690REN | 3.0V/3.3V 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 |
|---|---|
| SP805MEN | 制造商:Exar Corporation 功能描述:Power Supply Supervisor Circuit, 8 Pin, Plastic, SOP |
| SP805MEN/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP805MEP | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP805R | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:3.0V/3.3V Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP805RCN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:3.0V/3.3V Low Power Microprocessor Supervisory with Battery Switch-Over |
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