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BD5243 Datasheet(PDF) 11 Page - Rohm

Part # BD5243
Description  Free Delay Time Setting Free Delay Time Setting
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD5243 Datasheet(HTML) 11 Page - Rohm

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Datasheet
11/13
BD52xx series
BD53xx series
TSZ02201-0R7R0G300040-1-2
© 2013 ROHM Co., Ltd. All rights reserved.
22.May.2013 Rev.006
www.rohm.com
TSZ22111
15
001
Circuit Applications
1) Examples of a common power supply detection reset circuit
Application examples of BD52xx series (Open Drain
output type) and BD53xx series (CMOS output type) are
shown below.
CASE1: Power supply of the microcontroller (VDD2)
differs from the power supply of the reset detection
(VDD1).
Use an open drain output type (BD52xx) device with a
load resistance RL attached as shown Fig.18.
CASE2: Power supply of the microcontroller (VDD1) is the
same as the power supply of the reset detection (VDD1).
Use a CMOS output type (BD53xx) device or an open
drain output type (BD52xx) device with a pull up resistor
between the output and VDD1.
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).
Please refer to Operational Notes for recommendations
on resistor and capacitor values.
2) The following is an example of a circuit application in which an OR connection between two types of detection voltage
resets the microcontroller.
To reset the microcontroller when many independent power supplies are used in the system, OR connect an open drain
output type (BD52xx series) to the microcontroller’s input with pull-up resistor to the supply voltage of the microcontroller
(VDD3) as shown in Fig. 20. By pulling-up to VDD3, output “High” voltage of micro-controller power supply is possible.
VDD1
BD52xx
VDD2
GND
CL
Noise-filtering
Capacitor
CT
RL
RST
Micro
controller
Fig.18 Open Drain Output Type
CL
Noise-filtering
Capacitor
VDD1
BD53xx
CT
GND
RST
Micro
controller
Fig.19 CMOS Output Type
VDD1
VDD3
GND
RST
microcontroller
CT
RL
VDD2
CT
BD52xx
NO.1
BD52xx
NO.2
Fig.20


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