Fujitsu MB3773 User Manual download pdf (Page 13)

MB3773

13

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APPLICATION CIRCUIT

EXAMPLE 1: Monitoring 5V Supply Voltage and Watchdog Timer

VCC (5V)

MB3773

RESET

RESET

CK

GND

Logic circuit

Notes : • Supply voltage is monitored using VS.

• Detection voltage are V

SH and VSL.

C

T

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 R

1 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

R

1 and R2 (See the table below.)

R1

R2

CT

R

1

(k

Ω

ΩΩ

Ω

)R

2

(k

Ω

ΩΩ

Ω

) Detection voltage: V

SL

(V) Detection voltage: V

SH

(V)

10 3.9 4.4 4.5

9.1 3.9 4.1 4.2

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 28 29

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