BD9251FV_11 ROHM [Rohm], BD9251FV_11 Datasheet - Page 5

• Manufacturer Part Number: BD9251FV_11
• Description: IC for Human Body Detector Amplifier for Pyroelectric Infrared Sensor
• Manufacturer: ROHM [Rohm]

●Block Diagram/Application
●PIN Description
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© 2011 ROHM Co., Ltd. All rights reserved.
BD9251FV
Pyroelectric
PIN No.
sensor
10
11
12
13
14
1
2
3
4
5
6
7
8
9
Example of circuit constant：
D
S
G
A1P_IN
C1=C2=C3
C4=C6
C5=C7
C8
DRAIN
※ Please decide the constant after it confirms it enough examing the characteristic and the condition
C2
C3
C4
of the pyroelectric sensor.
PIN Name
REF_OUT
COMP_IN
A1_OUT
A2_OUT
A1P_IN
A1N_IN
A2P_DI
A2N_IN
D_OUT
T_OUT
DRAIN
GND
VDD
NC
R1
A1N_IN
Pyroelectric
sensor
: 1uF
: 6.9uF
: 15nF
: 10uF
+
D
G
S
-
A1_OUT
A1P_IN
AMP1
DRAIN
R2
※ Please decide the constant after it confirms it enough examing the characteristic and the condition
C5
C2
C3
C4
of the pyroelectric sensor.
Ground
NC
Power supply for pyroelectric infrared sensor
Sensor input
Amp1 n-input
Amp1 output
Amp2 diode output
Amp2 n-input
Amp2 output, Analog output
Reference voltage (1/2VDD) output
Comparator input
Comparator output
Moving detection output
Power supply
R1
A1N_IN
A2P_DI
C6
+
-
A1_OUT
AMP1
R2
C5
A2N_IN
R3
R1=R3
R2=R4
R5
A2P_DI
C6
Regulator
Voltage
+
-
A2_OUT
AMP2
A2N_IN
R3
Function
R4
C7
5/8
: 47kΩ
: 4.7MΩ
: 220kΩ
Regulator
Voltage
+
-
A2_OUT
AMP2
R4
C7
VDD
C8
VDD
C8
REF_OUT
REF_OUT COMP_IN
R5
R5
C1
C1
COMP_IN
+
+
-
-
+
+
-
-
BD9251FV
GND
Ｓ
BD9251FV
GND
Ｓ
Ｒ
D_OU
T_OU
Remarks
D_OUT
T_OUT
Technical Note
2011.10 - Rev.A