bd45331g ROHM Co. Ltd., bd45331g Datasheet - Page 5

• Manufacturer Part Number: bd45331g
• Description: Counter Timer Built-in Cmos Voltage Detector Ic
• Manufacturer: ROHM Co. Ltd.

●Circuit Applications
1）Examples of a common power supply detection reset circuit.
2) The following is an example of a circuit application in which an OR connection between two types of detection voltages resets the
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.
microcontroller.
V
DD1
V
GND
V
DD1
DD1
BD45□□□
Fig.18 Open Collector Output Type
ER
BD46□□□
Fig.19 CMOS Output Type
BD45 □□□
No.1
C
（Noise-filtering
R
L
Capacitor）
L
V
OUT
C
（Noise-filtering
L
Capacitor）
V
Microcontroller
DD2
ER
Microcontroller
BD45 □□□
No.2
Fig.20
V
GND
DD2
5/8
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 Figure
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 Figure 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).
V
OUT
R
L
R
ST
microcontroller
V
GND
DD3