BD9251FV_11 ROHM [Rohm], BD9251FV_11 Datasheet - Page 6

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

●Timing chart ( When using dual type pyro sensor )
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© 2011 ROHM Co., Ltd. All rights reserved.
BD9251FV
Time axis
A1P_IN
(Pyro sensor output)
A2_OUT
(Analog output)
VREF_H side
Comparator output
VREF_L side
Comparator output
D_OUT
T_OUT
※When using dual type pyro sensor , it’s possible to detect the direction of movement by checking the switch of T_out signal at D_out=H.
VREF_H
VREF_L
Left
Pyro sensor
L
Right
Sensor Part
1
H
→
2
6/8
Time axis
A1P_IN
Pyro sensor output)
A2_OUT
(Analog output)
VREF_H side
Comparator output
VREF_L side
Comparator output
D_OUT
T_OUT
VREF_H
VREF_L
H
Left
Pyro sensor
Right
L
Sensor Part
1
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Technical Note
2011.10 - Rev.A
2