參數(shù)資料
型號: MAX802
廠商: Maxim Integrated Products, Inc.
英文描述: 3.0V/3.3V Microprocessor Supervisory Circuits(具有看門狗和支持備用電池,高精度復(fù)位器)
中文描述: 3.0V/3.3V微處理器監(jiān)控電路
文件頁數(shù): 10/12頁
文件大小: 134K
代理商: MAX802
M
3.0V /3.3V Mic roproc essor S upervisory Circ uits
10
______________________________________________________________________________________
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
GND
V
CC
0V
TO
μ
P
V
L
= R
1
V
PFT
PFI
PFO
R
1
R
2
R
3
*OPTIONAL
C1*
V
IN
V
TRIP
V
IN
PFO
0V
V
H
V
L
R
1
+ R
2
V
H
= (V
PFT
+ V
PFH
) (R
1
)
V
TRIP
= V
PFT
+
1
+
1
3
1
R
3
V
CC
V
PFT
= 1.237V
V
PFH
= 10mV
WHERE
V
CC
GND
TO
μ
P
PFI
PFO
R
1
R
2
R
3
*OPTIONAL
C1*
V
IN
R
1
+ R
2
V
H
= R
1
(V
PFT
+ V
PFH
)
V
TRIP
= V
PFT
+
1
+
1
3
1
R
3
(V
CC -
V
D
)
V
PFT
= 1.237V
V
PFH
= 10mV
D
= DIODE FORWARD VOLTAGE DROP
V
L
= V
TRIP
WHERE
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
0V
PFO
0V
V
H
V
IN
V
TRIP
b
a
( )
( )
( )
( )
+
1
+
1
3
1
( )
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
GND
V
CC
PFI
PFO
R
1
R
2
V-
0V
V-
PFO
V
TRIP
V
L
V
PFT
= 1.237V
V
PFH
= 10mV
WHERE
3.0V OR 3.3V
V
TRIP
= R
2
+
R
1
1
1
)
(
R
2
V
CC
1
R
1
V
CC
(V
PFT
+ V
PFH
)
V
L
= R
2
+
R
1
1
)
(
R
2
R
1
(V
PFT
)
NOTE: V
TRIP
IS NEGATIVE
V
CC
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
GND
V
CC
PFI
PFO
R
1
R
2
PFO
V
TRIP
V
H
* MAX704T/S/R,
MAX806T/S/R ONLY
3.0V OR 3.3V
V
IN
V
TRIP
=
)
(
R
2
R
1
+
R
2
V
PFT
V
H
=
(V
PFT
+
V
PFH
)
V
CC
V
IN
MR
*
b
a
)
(
R
2
R
1
+
R
2
Figure 4. a) Adding Additional Hysteresis to the Power-Fail Comparator
b) Shifting the Additional Hysteresis above V
PFT
Figure 5. Using the Power-Fail Comparator to Monitor an Additional Power Supply
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