MB3773 Просмотр технического описания (PDF) - Fujitsu

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производитель

MB3773

Power Supply Monitor with Watch-Dog Timer

Fujitsu 

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

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