BU4836F-TR Datasheet, PDF (11/16 Pages) Rohm – Low Voltage Standard CMOS Voltage Detector ICs

BU48xx series BU49xx series
Datasheet
●Circuit Applications
1) Examples of a common power supply detection reset circuit
VDD1
VDD2
RL
BU48xx
RST
Micro
controller
CIN
CL
(Capacitor for
noise filtering)
GND
Fig.15 Open Drain Output type
VDD1
CIN
GND
BU49xx
RST
Micro
controller
CL
(Capacitor for
noise filtering)
Application examples of BU48xx series
(Open Drain output type) and BU49xx series
(CMOS output type) are shown below.
CASE1:The power supply of the microcontroller (VDD2)
differs from the power supply of the reset detection (V DD1).
Use the Open Drain Output Type (BU48xx series).
Attach a load resistance (RL) between the output and
VDD2. (As shown Fig.15)
CASE2:The power supply of the microcontroller (VDD1) is
same as the power supply of the reset detection (VDD1).
Use CMOS output type (BU43xx series) or Open Drain
Output Type (BU48xx series). Attach a load
resistance (RL) between the output and VDD1.
(As shown Fig.16)
When a capacitance CL for noise filtering for setting the
output delay time 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).
Fig.16 CMOS Output type
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
BU48Exxx
NO.1
BU48xx
NO.2
CT
CT
RL
RST
microcontroller
Fig.17
GND
To reset the microcontroller when many independent power supplies are used in the system, OR connect an open drain
output type (BU48xx 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
TSZ02201-0R7R0G300060-1-2
22.May.2013 Rev.008