BD46XXG View Datasheet(PDF) - ROHM Semiconductor
Part Name
Description
Manufacturer
BD46XXG Datasheet PDF : 10 Pages
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BD45□□□G, BD46□□□G series
Circuit Applications
1) Examples of a common power supply detection reset circuit.
Technical Note
VDD1
BD45□□□
VDD2
RL
Microcontroller
CL
（Noise-filtering
Capacitor）
Fig.18 Open Collector Output Type
GND
VDD1
BD46□□□
Microcontroller
GND
CL
（Noise-filtering
Capacitor）
Fig.19 CMOS Output Type
Application examples of BD45□□□G series (Open Drain
output type) and BD46□□□G 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 (BD45□□□G) attached a
load resistance (RL) between the output and VDD2. (As
shown Fig.18)
CASE2: the power supply of the microcontroller (VDD1) is
same as the power supply of the reset detection (VDD1).
Use CMOS output type (BD46□□□G) or open drain output
type (BD45□□□G) attached a load resistance (RL)
between the output and Vdd1. (As shown Fig.19)
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.
VDD1
VDD2
ER BD45□□□ VOUT
No.1
ER BD45□□□ VOUT
No.2
VDD3
RL
microcontroller
RST
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 BD45□□□G
series to pull-up to the desired voltage (VDD3) as shown in Fig. 20 and make the output “High” voltage matches the power
supply voltage VDD3 of the microcontroller.
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© 2009 ROHM Co., Ltd. All rights reserved.
2009.05 - Rev.C
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