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MB3773
17
EXAMPLE 6: Monitoring Low voltage and Overvoltage Monitoring (with hysteresis)
VCC (5 V)
1
2
3
4
8
7
6
5
MB3773
RESET
RESET
CK
GND
Comp. 2
Example : Comp. 1, Comp. 2
: MB4204, MB47393
20 kΩ
R
6
_
+
180 kΩ
R
4
30 kΩ
R
3
5.6 kΩ
R
6
1.2 kΩ
R
1
4.7 kΩ
R
5
Comp. 1
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
1L/V1H at the time of low voltage are approximately 4.2 V/4.3 V.
Detection voltages V
2L/V2H at the time of overvoltage are approximately 6.0 V/6.1 V.
For the formulas for finding hysteresis width and detection voltage, see EXAMPLE 4.
• Use V
CC ( = 5 V) to power the comparators (Comp. 1 and Comp. 2) in the external circuit shown
above.
Logic circuit
Diode
RESET
0
V
1L V1H
V2L V2H
VCC
+
_
CT