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Block diagram

Cin: 0.33

µF to 1000 µF

Co: 0.1

µF to 1000 µF

CT: 0.001

µF to 22 µF

Fig.13

Pin descriptions

Pin. No

Pin name

Function

1

CLK

Clock input from microcontroller

Vs(BD3004HFP)

Reset

2

INH(BD3005HFP)

WDT on/off function pin (WDT off when INH = high; WDT on when INH = low)

3

Vcc

Power supply pin

4

GND

GND pin

5

OUT

Voltage output pin

6

RESET

Reset output pin

7

CT

Reset output delay time, WDT monitor time setting external capacitance connection pin

FIN

GND

GND pin

I/O Circuit diagram

CLK (1 pin)

Vs(2 pin)

INH (2 pin)

OUT (5 pin)

RESET (6 pin)

CT (7 pin)

Fig.14

* All resistance values are typical ones.

PREREG

Vcc

100KΩ

HRP7

1 2 3 4 5 6 7

FIN

OUT

OUT

470KΩ

RESET

Vcc

Rb

Ra

OUT

Vcc

PREREG

100KΩ

CLK

OUT

CT

OUT

Vcc

100KΩ

PREREG

3.56MΩ

1.56MΩ

Vs

Vs

WDT

Pre Reg

TSD

Vref

OUT

OUT

Vcc

CLK

GND

OUT

RESET

CT

OCP

Reverse Polarity Protection

OUT

FIN

Co

Cin

CT

INH

（

BD3004HFP）

（

BD3005HFP）

microcontroller

Signal from

INH

3

2

2

1

4

7

6

5