MB3773 Datasheet, PDF (13/29 Pages) Fujitsu Component Limited. – Power Supply Monitor with Watch-Dog Timer

MB3773
■ APPLICATION CIRCUIT
EXAMPLE 1: Monitoring 5V Supply Voltage and Watch-dog Timer
VCC (5V)
CT
MB3773
1
8
2
7
3
6
4
5
Logic circuit
RESET
RESET
CK
GND
Notes : • Supply voltage is monitored using VS.
• Detection voltage are VSH and VSL.
EXAMPLE 2: 5V Supply Voltage Monitoring (external fine-tuning type)
VCC (5V)
CT
MB3773
R1
Logic circuit
1
8
RESET
2
7
RESET
3
6
CK
4
5
R2
GND
Notes : • Vs detection voltage can be adjusted externally.
• Based on selecting R1 and R2 values that are sufficiently lower than the resistance of the IC’s
internal voltage divider, the detection voltage can be set according to the resistance ratio of
R1 and R2 (Refer to the table below.)
R1 (kΩ)
10
9.1
R2 (kΩ)
3.9
3.9
Detection voltage: VSL (V)
4.4
4.1
Detection voltage: VSH (V)
4.5
4.2
13