bd4729g ROHM Co. Ltd., bd4729g Datasheet - Page 6

• Manufacturer Part Number: bd4729g
• Description: Bipolar Voltage Detector Ic
• Manufacturer: ROHM Co. Ltd.

3）The following is an example of an application circuit in which an OR connection between two types of detection voltage.
4）
When there are several system power supplies and it is necessary to monitor power supplies VCC1 and VCC2 independently as well as
reset the microcontroller, the following application (as shown in Fig. 14) is possible. The output voltage “High” is matched to the
microcontroller power supply VDD1 by using an OR connection to pull up to an arbitrary voltage (VDD1).
The output of the BD47□□G series consists of a bipolar NPN transistor. When the input voltage is at or below the detection voltage
(VS), VOUT will be set to “Low”. This configuration makes it easier to secure output current capacity even when the output voltage
falls as well as when the pull up resistor (RL) at the output has to be made smaller or when many reset terminals have to be driven by
a single reset IC (Fig. 16).
V
CC1
BD47□□G
V
GND
CC
BD47□□G
BD47□□G
No.1
V
OUT
V
GND
CC
R
V
R
L
OUT
eset
V
V
OUT
CC2
GND
V
DD
BD47□□G
Fig.14
No.2
Fig.15
Fig.16
6/8
R
L
R
eset
V
OUT
R
eset
V
GND
R
DD
L
Microcontroller
R
ST
V
GND
contoller
Micro-
DD
R
eset
V
GND
V
GND
DD
DD1