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參數(shù)資料
| 型號： | IMP813LCPA |
| 廠商： | IMP INC. |
| 英文描述： | LOW-POWER レP SUPERVISOR CIRCUITS |
| 中文描述： | 低功耗レP監(jiān)控電路 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 167K |
| 代理商： | IMP813LCPA |
1999 IMP, Inc.
408-432-9100/www.impweb.com
7
IMP705/6/7/8, 8
1
1
3L
Monitoring Voltages Other Than V
CC
The IMP705-708 can monitor voltages other than V
CC
using the
Power Fail circuitry. If a resistive divider is connected from the
voltage to be monitored to the Power Fail input, PFI, the PFO
(output) will go LOW if the divider voltage goes below its 1.25V
reference. Should hysteresis be desired, connect a resistor (equal
to approximately 10 times the sum of the two resistors in the
divider) between the PFI and PFO pins. A capacitor between PFI
and GND will reduce circuit sensitivity to input high-frequency
noise. If it is desired to assert a RESET in addition to the PFO flag,
this may be achieved by connecting the PFO output to MR.
Monitoring a Negative Voltage
The Power-Fail circuitry can also monitor a negative supply rail.
When the negative rail is OK, PFO will be LOW, and when the
negative rail is failing (not negative enough), PFO goes HIGH
(the opposite of when positive voltages are monitored). To trigger
a reset, these outputs need to be inverted: adding the resistors
and transistor as shown achieves this. The RESET output will
then have the same sense as for positive voltages: good = HIGH,
bad = LOW. It should be noted that this circuit’s accuracy depends
on the V
CC
line, the PFI threshold tolerance, and the resistors.
IMP70x
V
CC
= 5V
V
IN
= 12V
GND
V
CC
RESET
To Processor
12V Threshold
~10.87V
PFO
MR
PFI
1M
W
130k
W
705_07.eps
IMP70x
+
—
+5V
Negative Input
Voltage
GND
V
CC
RESET
PFO
MR
PFI
RP
RN
705_09.eps
5 1 25
RP
1 25
.
=
.
V
RN
TRIP
Application Information
Figure 4. Monitoring Voltages Other Than V
CC
Figure 5. Monitoring a Negative Voltage
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IMP813LCSA | 制造商:IMP 制造商全稱:IMP 功能描述:LOW-POWER レP SUPERVISOR CIRCUITS |
| IMP813LCUA | 制造商:Imp Inc 功能描述:Low Cost P Supervisor Circuits |
| IMP813LEPA | 制造商:IMP 制造商全稱:IMP 功能描述:LOW-POWER レP SUPERVISOR CIRCUITS |
| IMP813LESA | 制造商:IMP 制造商全稱:IMP 功能描述:LOW-POWER レP SUPERVISOR CIRCUITS |
| IMP8-1A0-00-A-XXX | 制造商:ASTEC 制造商全稱:Astec America, Inc 功能描述:Intelligent MP Series Up to 1500 Watts |
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