MB3773 Datasheet, PDF (14/31 Pages) Fujitsu Component Limited. – Power Supply Monitor with Watch-Dog Timer

MB3773
9. Application Circuit
EXAMPLE 1: Monitoring 5V Supply Voltage and Watch-dog Timer
VCC (5V)
C_T
MB3773
1
8
2
7
3
6
4
5
Logic circuit
RESET
RESET
CK
GND
Notes :
• Supply voltage is monitored using V_S.
• Detection voltage are V_SH and V_SL.
V_CC (5V)
CT
EXAMPLE 2: 5V Supply Voltage Monitoring (external fine-tuning type)
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: V_SL (V)
4.4
4.1
Detection voltage: V_SH (V)
4.5
4.2
Document Number: 002-08513 Rev. *A
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