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BU45L262 데이터시트(PDF) 10 Page - Rohm

부품명 BU45L262
상세설명  Counter Timer Built-in CMOS Voltage Detector IC
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TSZ02201-0R7R0G300130-1-2
TSZ22111
15
001
10/14
17.May.2013 Rev.003
BU45Kxxxx, BU46Kxxxx, BU45Lxxxx, BU46Lxxxx series
Datasheet
Circuit Applications
1. Examples of a common power supply detection reset circuit.
Application examples of BU45xxxxx series (Open Drain
output type) and BU46xxxxx 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 (BU45xxxxx series)
device with a load resistance RL as shown Fig.16.
CASE2: Power supply of the microcontroller (VDD1) is
same as the power supply of the reset detection (VDD1).
Use a CMOS output type (BU46xxxxx) device or an open
drain output type (BU45xxxxx)
with pull up resistor
between the output and VDD1. (As shown Fig.17)
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 voltage
resets the microcontroller.
Fig. 18
To reset the microcontroller when many independent power supplies are used in the system, OR connect an open drain
output type (BU45xxxxx series) to the microcontroller’s input with pull-up resistor to the supply voltage of the
microcontroller (VDD3) as shown in Fig. 18. By pulling-up to VDD3, output “High” voltage of micro-controller power supply is
possible.
Fig.16 Open Drain Output Type
Fig.17 CMOS Output Type
VDD1
VDD2
GND
BU45xxxxx
CL
Noise-filtering
Capacitor
RL
RST
Micro
controller
CL
Noise-filtering
Capacitor
VDD1
GND
BU46xxxxx
RST
Micro
controller
VDD2
VDD1
VDD3
GND
RST
Micro
controller
RL
BU45xxxxx
BU45xxxxx


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