MB3773
13
■
■■
■APPLICATION CIRCUIT
EXAMPLE 1: Monitoring 5V Supply Voltage and Watchdog Timer
VCC (5V)
MB3773
RESET
RESET
CKGND
Logic circuit
Notes : • Supply voltage is monitored using VS.
• Detection voltage are VSH and VSL.
CT
1
2
3
4
8
7
6
5
EXAMPLE 2: 5V Supply Voltage Monitoring (external fine-tuning type)
VCC (5V)
1
2
3
4
8
7
6
5
MB3773
RESET
RESET
CK
GND
Logic circuit
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 (See the table below.)
R1
R2
CT
R1 (kΩ
ΩΩ
Ω)R
2 (kΩ
ΩΩ
Ω) Detection voltage: VSL (V) Detection voltage: VSH (V)
10 3.9 4.4 4.5
9.1 3.9 4.1 4.2