- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄372194 > SP791EP Low Power Microprocessor Supervisory with Battery Switch-Over PDF資料下載
參數(shù)資料
| 型號(hào)： | SP791EP |
| 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)： | 12/19頁 |
| 文件大小： | 202K |
| 代理商： | SP791EP |
SP791DS/08 SP791 Low Power Microprocessor Supervisory with Battery Switch-Over
Copyright 2000 Sipex Corporation
12
POWER-FAIL INPUT
The Power-Fail Input (PFI) has a guaranteed
input leakage of +/-25nA max over temperature.
The typical comparator delay is 15
μ
s from V
IL
to V
OL
(power failing), and 55
μ
s from V
IH
to
V
OH
(power being restored). Connect PFI to
ground if not used.
POWER-FAIL OUTPUT
The Power-Fail Output (PFO) goes low when
PFI falls below 1.25V. It sinks 3.2mA with a
saturation voltage of 0.1V. With PFI above
1.25V, PFO is actively pulled to V
OUT
. Con-
necting PFI through a voltage divider to an un-
regulated supply allows PFO to generate an NMI
as the unregulated power begins to fall (see
Figure 9b
).
LOWLINE OUTPUT
The low-line comparator monitors V
CC
with a
typical threshold voltage 150mV above the re-
set threshold and has 15mV of hysteresis.
LOWLINE typically sinks 3.2mA at 0.1V. For
normal operation (Vcc above the LOWLINE
threshold), LOWLINE is pulled to V
OUT
. If ac-
cess to the unregulated supply is unavailable,
use LOWLINE to provide a nonmaskable in-
terrupt (NMI) to the
μ
P as shown in
Figure 9a
.
POWER-FAIL COMPARATOR
The power-fail comparator is an uncommitted
comparator that has no effect on the other func-
tions of the
SP791
. Common uses include moni-
toring supplies other than 5V (see the
Typical
Operating Circuit
and the
Monitoring a Nega-
tive Voltage
section) and early power-fail de-
tection when the unregulated power is easily ac-
cessible as shown in
Figure 9b
.
Figure 9. a) If the unregulated supply is inaccessible, LOWLINE generates the NMI for the
μ
P.
b) Use PFO to generate the
μ
P NMI if the unregulated supply is accessible.
FROM
REGULATED
SUPPLY
0.1
μ
F
3
2
1
15
10
11
0.1
μ
F
3.0V
4
POWER TO
CMOS RAM
μ
P
RESET
NMI
I/O LINE
RESET
LOWLINE
WDI
GND
V
BATT
V
OUT
Vcc
C orporation
UNREGULATED
SUPPLY
a.)
b.)
μ
P POWER
3
2
1
15
6
11
0.1
μ
F
3.0V
4
POWER TO
CMOS RAM
μ
P
RESET
NMI
I/O LINE
RESET
PFO
WDI
GND
V
BATT
V
OUT
Vcc
C orporation
μ
P POWER
PFI
7
0.1
μ
F
VOLTAGE
REGULATOR
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP800LCT | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP800LEN | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP800LEP | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP800LET | Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP800M | 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 |
|---|---|
| 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 |
| SP7B10/E12/41K | 制造商:Eiko Ltd 功能描述:Bullet Shape Decorative 7W/120V/4100K Compact Fluorescent Lamp 制造商:Eiko Ltd 功能描述:7W BULLET SHAPE 41K 120V E12 BASE |
| SP7B13/E26/41K | 制造商:Eiko 功能描述:Bullet Shape Decorative 7W/120V/4100K Compact Fluorescent Lamp 制造商:Eiko Ltd 功能描述:7W 120V 4100KBULLET SHAPE CFL MED SCREW BASE NO DIM |
| SP7G | 制造商:Hubbell Wiring Device-Kellems 功能描述:GRAY PAINTED STEEL SINGLE RECEPTACLE |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。