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EXAMPLE 6: Monitoring Low voltage and Overvoltage Monitoring (with hysteresis)
V
(5 V)
CC
C
T
Notes : Comp. 1 and Comp. 2 are used to monitor for overvoltage while the MB3773 is used to monitor
for low voltage. Detection voltages V
Detection voltages V
For the formulas for finding hysteresis width and detection voltage, see EXAMPLE 4.
Use V
(
5 V) to power the comparators (Comp. 1 and Comp. 2) in the external circuit shown
CC
above.
MB3773
1
8
2
7
3
6
4
5
1.2 k
R
1
5.6 k
4.7 k
R
R
6
5
/V
1L
1H
/V
at the time of overvoltage are approximately 6.0 V/6.1 V.
2L
2H
20 k
R
6
30 k
Diode
R
3
180 k
R
4
+
_
_
+
Comp. 1
Comp. 2
Example : Comp. 1, Comp. 2
RESET
0
V
V
1L
at the time of low voltage are approximately 4.2 V/4.3 V.
MB3773
Logic circuit
RESET
RESET
CK
GND
: MB4204, MB47393
V
CC
V
V
2L
2H
1H
17
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