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| 型號(hào)： | 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(kāi)關(guān)過(guò) |
| 文件頁(yè)數(shù)： | 13/19頁(yè) |
| 文件大?。?/td> | 202K |
| 代理商： | SP791EN |
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SP791DS/08 SP791 Low Power Microprocessor Supervisory with Battery Switch-Over
Copyright 2000 Sipex Corporation
PIN
1
NAME
V
BATT
STATUS
Supply current is 1
μ
A maximum
When V
CC
< V
BATT
-1.2V
V
OUT
is connected to V
BATT
through an Internal PMOS switch.
Battery-switchover comparator
monitors V
CC
for active switchover.
V
CC
is disconnected from V
OUT
GND-0V reference for all signals.
Logic high. The open-circuit output is
equal to V
OUT
.
The power-fail comparator is disabled
PFO is forced low.
The power-fail comparator is disabled
SWT is Ignored.
MR is ignored.
LOWLINE Logic low.
WDI
WDI is ignored, and goes high
impedance.
CE
OUT
Logic high. The open-circuit output
voltage is equal to V
OUT
.
CE
IN
High Impedance.
WDO
Logic high. The open-circuit output
voltage is equal to V
OUT
.
RESET Logic low.
WDPO
Logic high. The open-circuit output
voltage is equal to V
OUT
.
2
V
OUT
3
V
CC
4
5
GND
BATT ON
6
PFO
7
8
9
10
11
PFI
SWT
MR
12
13
14
15
16
INPUT SUPPLY VOLTAGE
The Input Supply Voltage (V
CC
) should be a
regulated +5V source. V
CC
connects to V
OUT
via a parallel diode and a large PMOS switch
(
Figure 10
). The switch carries the entire
current load for currents less than 250mA.
The parallel diode carries any current in excess
of 250mA. The maximum continuous current
is 250mA, but power-on transients may reach a
maximum of 1A.
BACKUP-BATTERY INPUT
The Backup-Battery Input (V
BATT
) is similar
to V
CC
, except the PMOS switch and parallel
diode are much smaller. Continuous current
should be limited to 25mA and peak currents
(only during power-up) limited to 250mA. The
reverse leakage of this input is less than 1
μ
A
over temperature and supply voltage.
OUTPUT SUPPLY VOLTAGE
The Output Supply Voltage (V
OUT
) supplies all
the current to the external system and internal
circuitry. All open-circuit outputs will, for ex-
ample, assume the V
OUT
voltage in their high
states rather than the V
CC
voltage. At the maxi-
mum source current of 250mA, V
OUT
will typi-
cally be 200mV below V
CC
. V
OUT
should be
decoupled with 0.1
μ
F capacitor.
BATTERY-BACKUP MODE
The
SP791
requires two conditions to switch to
battery-backup mode: 1) V
CC
must be below
the reset threshold; 2) V
CC
must be below
V
BATT
.
Table 1
lists the status of the inputs and
outputs in battery-backup mode.
BATTERY ON OUTPUT
The Battery On Output (BATT ON) indicates
the status of the internal V
CC
/battery-switchover
comparator, which controls the internal V
CC
and
V
BATT
switches. For V
CC
greater than V
BATT
(ignoring the small hysteresis effect), BATT ON
is a logic low. For V
CC
less than V
BATT
, BATT
ON is a logic high. Use BATT ON to indicate
battery-switchover status or to supply base drive
to an external pass transistor for higher-current
applications (see
Typical Operating Circuit).
Figure 10. V
CC
and V
BATT
-to-V
OUT
Switch
To enter the Battery-Backup mode, V
CC
must be less than
the Reset threshold and less than V
BATT
.
Table 1. Input/Output states in Battery-Backup mode
C orporation
V
BATT
Vcc
2
V
OUT
0.1
μ
F
INPUT/OUTPUT STATES IN
BATTERY-BACKUP MODE
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| SP791EP | Low Power Microprocessor Supervisory with Battery Switch-Over |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(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 |
| 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(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 |
| SP791EP | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
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