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STRUCTURE TYPE PRODUCT FEATURES
Silicon Monolithic Integrated Circuit
BD9251FV
Preamp IC for Pyroelectricity Infrared Sensor 1Amplifier for sensor output 2Comparator for sensor output 3Built-in voltage regulator 4Built-in moving detector
Absolute Maximum Ratings (Ta=25) Parameter Symbol Supply Voltage Power Dissipation Operating Temperature VDD Pd Topr
Limits -0.37.0 440
1
Units V mW
-3075
-55125 Storage Temperature Tstg 1. It reduces 3.5mW/ then Ta25. (On glass epoxy board of 70mmx70mmx1.6mm)
Operating Conditions Parameter Supply Voltage A1P_IN Offset Voltage
Symbol VDD VA1P_IN_OFFSET
Min. 2.97 -
Typ. 5.0 1.5
Max. Units 6.0 V V
Remarks
VDRAIN=2.3V
This product don't design for protection radioactive rays.
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Electric Characteristics VDD=5.0V, Ta=25
Parameter
Supply Current DRAIN Output Voltage AMP1/AMP2 Input Voltage AMP1/AMP2 Gain AMP1/AMP2 Unity Gain AMP1 Input Offset Voltage AMP2 Output Offset Voltage A2_OUT Output Current (source) A2_OUT Output Current (sink) D_OUT / T_OUT Output "H" Voltage D_OUT / T_OUT Output "L" Voltage
Symbol
IDD DRAIN VIN AG AUG VA1OFF VA2OUT IA2OUT1 IA2OUT2 VOH
Spec Min. 2.0 0.1 20 20 VDD-0.6 0 Typ. 300 2.3 1 1.5 30 200 Max. 400 VDD-0.8 46 10 VDD 0.6
Units uA V dB MHz mV V A A V V IOH=-1mA IOL=+1mA
Conditions Output no load VDD2.97V, IDRAIN100A
VOL
Package Outline
Fig.1 SSOP-B14 Package (Unit:mm)
D9251
Lot No.
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PIN Description PIN No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14
PIN Name GND NC DRAIN A1P_IN A1N_IN A1_OUT A2P_DI A2N_IN A2_OUT REF_OUT COMP_IN D_OUT T_OUT VDD Ground NC
Function
Remarks
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
Block Diagram/Application
VDD DRAIN Voltage Regulator C2 C1 Preamp
Pyroelectric sensor
D A1P_IN S C3 10k G 47k A1N_IN A1_OUT A2P_DI +
AMP1
350k 650k
33k
+ 7.5k
AMP2
+
D_OUT
-
-
T_OUT
7.5k 33k
+
A2N_IN
A2_OUT
REF_OUT R5
COMP_IN
GND
R2 C4 R1 C5 C6 R3
R4 C7 C8
Please decide the constant after it confirms it enough examining the characteristic and the condition of the pyroelectric sensor.
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Cautions on use. (1) Absolute maximum ratings Use of the IC in excess of absolute maximum ratings such as the applied voltage or operating temperature range may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode) when such damage is suffered. A physical safety measure such as a fuse should be implemented when use of the IC in aspecial mode where the absolute maximum ratings may be exceeded is anticipated. (2) GND potential Ensure a minimum GND pin potential in all operating conditions. (3) Short circuit mode between terminals and wrong mounting In order to mount the IC on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting can destroy the IC. Furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or the GND terminal, the IC can destroy. (4) Actions in strong magnetic field Use caution when using the IC in the presence of a strong magnetic field as doing so may cause the IC to malfunction. (5) Mutual impedance Use short and wide wiring tracks for the power supply and ground to keep the mutual impedance as small as possible .Use a capacitor to keep ripple to a minimum. (6) About warm-up time Operation depends on a power-supply voltage and an external constant for time until stabilizing. Please confirm warm-up time enough when you use it.
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Notice
Notes
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