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BD45315 Datasheet(PDF) 6 Page - Rohm

No. de pieza BD45315
Descripción Electrónicos  Counter Timer Built-in CMOS Voltage Detector IC
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Fabricante Electrónico  ROHM [Rohm]
Página de inicio  http://www.rohm.com
Logo ROHM - Rohm

BD45315 Datasheet(HTML) 6 Page - Rohm

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Technical Note
6/9
BD45
□□□G, BD46□□□G series
www.rohm.com
2009.05 - Rev.C
© 2009 ROHM Co., Ltd. All rights reserved.
 Circuit Applications
1) Examples of a common power supply detection reset circuit.
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.
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.
VDD2
VDD1
VDD3
GND
microcontroller
RL
BD45□□□
No.1
ER
VOUT
ER
VOUT
BD45□□□
No.2
RST
VDD1
VDD2
GND
BD45□□□
Microcontroller
CL
(Noise-filtering
Capacitor)
RL
Fig.18 Open Collector Output Type
CL
(Noise-filtering
Capacitor)
VDD1
GND
BD46□□□
Microcontroller
Fig.19 CMOS Output Type
Fig.20


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