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參數資料
| 型號： | MAX807_CWE |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Full-Featured レP Supervisory Circuit with 【1.5eset Accuracy |
| 中文描述： | 全功能レP監(jiān)控電路與精度【1.5eset |
| 文件頁數： | 12/16頁 |
| 文件大小： | 116K |
| 代理商： | MAX807_CWE |
M
Power-Fail Comparator
PFI is the noninverting input to an uncommitted com-
parator. If PFI is less than V
PFT
(2.265V), PFO goes low.
The power-fail comparator is intended to monitor the
preregulated input of the power supply, providing an
early power-fail warning so software can conduct an
orderly shutdown. It can also be used to monitor sup-
plies other than 5V. Set the power-fail threshold with a
resistor divider, as shown in Figure 10.
Power-Fail Input
PFI is the input to the power-fail comparator. The typical
comparator delay is 14μs from V
IL
to V
OL
(power failing),
and 32μs from V
IH
to V
OH
(power being restored). If
unused, connect this input to ground.
Power-Fail Output
The Power-Fail Output (PFO) goes low when PFI goes
below V
PFT
. It typically sinks 3.2mA with a saturation
voltage of 0.1V. With PFI above V
PFT
, PFO is actively
pulled to V
CC
. Connecting PFI through a voltage divider
to a preregulated supply allows PFO to generate an
NMI as the preregulated power begins to fall (Figure
11b). If the preregulated supply is inaccessible, use
LOW LINE to generate the NMI (Figure 11a). The LOW
LINE threshold is typically 52mV above the reset
threshold (see Low-Line Comparatorsection).
Full-Featured μP S upervisory Circ uit with
±1.5% Reset Ac c urac y
12
______________________________________________________________________________________
MAX807
V
CC
GND
PFI
PFO
R1
R2
V
IN
0V
V
IN
PFO
V
TRIP
V
L
V
PFT
= 2.265V
V
PFH
= 20mV
WHERE
V
TRIP
= R2
+
R1
1
)
(
R2
1
–
R1
V
CC
(V
PFT
+ V
PFH
)
V
L
= R2
+
R1
1
)
(
R2
1
–
R1
V
CC
(V
PFT
)
NOTE: V
TRIP,
V
L
ARE NEGATIVE
V
CC
MAX807
V
CC
GND
PFI
PFO
R1
R2
PFO
V
TRIP
V
H
V
IN
V
TRIP
=
)
(
R2
R1
+
R2
V
PFT
V
H
=
(V
PFT
+
V
PFH
)
V
CC
V
IN
MR
b)
a)
)
(
R2
R1
+
R2
MAX807
OUT
V
CC
FROM
REGULATED
SUPPLY
POWER TO
CMOS RAM
BATT
RESET
LOW LINE
WDI
GND
RESET
NMI
I/OLINE
μ
P
μ
P POWER
0.1
μ
F
0.1
μ
F
2.8V
a)
b)
MAX807
OUT
V
CC
PFI
POWER TO
CMOS RAM
BATT
RESET
PFO
WDI
GND
VOLTAGE
REGULATOR
RESET
NMI
I/OLINE
μ
P
μ
P POWER
0.1
μ
F
0.1
μ
F
2.8V
Figure 10. Using the Power-Fail Comparator to Monitor an Additional Power Supply: a) V
IN
is Negative, b) V
IN
is Positive
Figure 11. a) If the preregulated supply is inaccessible, LOW
LINE generates the NMI for the μP. b) Use PFO to generate the
μP NMI if the preregulated supply is accessible.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX807L | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Full-Featured レP Supervisory Circuit with 【1.5eset Accuracy |
| MAX807LCPE | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數: 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX807LCPE+ | 功能描述:監(jiān)控電路 Full-Featured uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數: 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX807LCUE | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數: 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX807LCUE+ | 功能描述:監(jiān)控電路 Full-Featured uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數: 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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