MB3771PF Fujitsu Microelectronics, Inc., MB3771PF Datasheet - Page 11

• Manufacturer Part Number: MB3771PF
• Description: Power Supply Monitor
• Manufacturer: Fujitsu Microelectronics, Inc.

9. Dual (Positive/Negative) Power Supply Voltage Monitoring (V
10. Reference Voltage Generation and Voltage Sagging Detection
(1) 9V Reference Voltage Generation and 5V/9V Monitoring
Monitors a 5 V and a negative (any given level) power supply. R
In cases where V
In the above examples, the output voltage and the detection voltage are determined by the following equations:
Supply)
Detection Voltage = V
Example if V
Detection Voltage = 7.2 V
Detection Voltage = (R
Then the detected voltage = -4.37 V
V
V
EE
CC
EE
EE
V
= -5 V, R
may be output when V
CC
0.22 F
15 V
: 5 V
R
4
SB
0.47 F
1
4
- V
+ R
= 91 k
SB
2
)
C
T
R
C
V
T
4
/R
SB
/R
3
2
CC
R
is not output, it is necessary to use a Schottky barrier diode (SBD).
5
: 5.1 k
SBD
1
2
3
4
R
20 k
MB3771
3
:
R
5
8
7
6
5
: 3 k
1
2
3
4
MB3771
1
, R
R
7.5 k
R
1.2 k
8
7
6
5
3
4
2
:
:
, and R
CC
R
R
3
= 5 V, V
R
R
1
2
should be the same value.
1
2
: 300 k
: 62 k
: 20 k
: 20 k
RESET
9 V ( 50 mA)
RESET
EE
= Negative Power
MB3771
11