Datasheet

Technical Note
6/9
BD52□□G, BD52□□FVE, BD53□□G, BD53□□FVE series
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2009.06 - Rev.B
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 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.
VDD1
BD52□□□
VDD2
GND
Microcontroller
CL
（Noise-filtering
Capacitor）
）
CT
R
L
Fig.18 Open Collector Output Type
CL
（Noise-filtering
Capacitor）
VDD1
BD53□□□
Microcontroller
CT
GND
Fig.19 CMOS Output Type
VDD1
VDD3
GND
R
ST
microcontroller
C
T
R
L
VDD2
CT
BD52□□□
NO.1
BD52□□□
NO.2
Fig.20