BD5246G Просмотр технического описания (PDF) - ROHM Semiconductor

Номер в каталоге

Компоненты Описание

производитель

BD5246G

Free Delay Time Setting CMOS Voltage Detector IC Series

ROHM Semiconductor 

BD52□□G, BD52□□FVE, BD53□□G, BD53□□FVE series

 Circuit Applications

1) Examples of a common power supply detection reset circuit

Technical Note

VDD1

VDD2

RL

BD52□□□

Microcontroller

CT

CL

（Noise-filtering

Capacitor）

）

Fig.18 Open Collector Output Type

GND

Application examples of BD52□□G/FVE series (Open

Drain output type) and BD53□□G/FVE series (CMOS

output type) are shown below.

CASE1: the power supply of the microcontroller (VDD2)

differs from the power supply of the reset detection

(VDD1).

Use the open drain output type (BD52□□G/FVE) attached

a load resistance (RL) between the output and VDD2. (As

shown Fig.15)

VDD1

CT

GND

BD53□□□

Microcontroller

CL

（Noise-filtering

Capacitor）

CASE2: the power supply of the microcontroller (VDD1) is

same as the power supply of the reset detection (VDD1).

Use CMOS output type (BD53□□G/FVE) or open drain

output type (BD52□□G/FVE) attached a load resistance

(RL) between the output and Vdd1. (As shown Fig.16)

When a capacitance CL for noise filtering is connected to

the VOUT pin (the reset signal input terminal of the

microcontroller), please take into account the waveform of

the rise and fall of the output voltage (VOUT).

Fig.19 CMOS Output Type

2) The following is an example of a circuit application in which an OR connection between two types of detection voltages

resets the microcontroller.

VDD1

VDD2

VDD3

BD52□□□

NO.1

CT

BD52□□□

NO.2

CT

RL

RST

microcontroller

Fig.20

GND

When there are many power supplies of the system, power supplies VDD1 and VDD2 are being monitored separately, and it is

necessary to reset the microcomputer, it is possible to use an OR connection on the open drain output type BD52□□G/FVE

series to pull-up to the desired voltage (VDD3) as shown in Fig.17 and make the output “High” voltage matches the power

supply voltage VDD3 of the microcontroller.

www.rohm.com

© 2009 ROHM Co., Ltd. All rights reserved.

6/9

2009.06 - Rev.B

Share Link: