BU4214 View Datasheet(PDF) - ROHM Semiconductor
Part Name
Description
Manufacturer
BU4214 Datasheet PDF : 16 Pages
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BU42xx series BU43xx series
●Circuit Applications
1) Examples of common power supply detection reset circuits
VDD1
CIN
CT
VDD1
VDD2
BU42xx
RL
Micro
RST controller
CL
(Capacitor for
noise filtering)
Fig.18 Open Drain Output type
GND
CIN
CT
GND
BU43xx
Micro
RST controller
CL
(Capacitor for
noise filtering)
Fig.19 CMOS Output type
Datasheet
Application examples of BU42xx series
(Open Drain output type) and BU43xx series
(CMOS output type) are shown below.
CASE1: Power supply of microcontroller (VDD2) differs
from the power supply of the reset detection (VDD1).
Use an open drain output Type (BU42xx series) device
with a load resistance RL as shown Fig.18.
CASE2: Power supply of microcontroller (VDD1) is the
same as the power supply of the reset detection (VDD1).
Use a CMOS output type (BU43xx series) device or an
open drain output type (BU42xx series) device with a pull
up resistor between the output and VDD1.
When a capacitance CL for noise filtering is connected to
VouT pin (the reset signal input terminal of the
microcontroller), please take into account the waveform
of the rise and fall time 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 voltage
resets the microcontroller.
VDD1
VDD2
VDD3
BU42xx
NO.1
CT
BU42xx
NO.2
CT
RL
RST
microcontroller
Fig.20
GND
To reset the microcontroller when many independent power supplies are used in the system, OR connect an open drain
output type (BU42xx 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.
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TSZ22111・15・001
11/13
TSZ02201-0R7R0G300050-1-2
03.Feb.2014 Rev.008
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