Technical Note

6/9

BD52

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

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2009.06 - Rev.B

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

 Circuit Applications

1) Examples of a common power supply detection reset circuit

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)

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).

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

resets the microcontroller.

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.

BD52□□□

GND

Microcontroller

（Noise-filtering

Capacitor）

）

Fig.18 Open Collector Output Type

（Noise-filtering

Capacitor）

BD53□□□

Microcontroller

GND

Fig.19 CMOS Output Type

GND

microcontroller

BD52□□□

NO.1

BD52□□□

NO.2

Fig.20