Pyroelectric infrared induction automatic light circuit (3)

The induction automatic lamp is made using the BTSSOOnI type infrared sensing signal special processing integrated circuit
. The circuit is shown in Figure 176. The operation is very stable and reliable and can be used for automatic lighting in bathrooms, storage rooms, etc.
    131SSOOOl is a dedicated IC with a CMOS digital-analog hybrid structure. The chip has
unit circuits such as a voltage comparator, a state controller, a delay circuit timer, a block time timer u and a reference voltage source. It currently has
two package forms: nIP_1 6 and S (jI (, 16). The power supply voltage range is 3 ~ 5V. The function of each pin is such as
F, pin ①^, which is a re-triggerable and non-re-triggerable control terminal. When A-1, repeated triggering is allowed;
when A-., small can be repeatedly triggered. Pin ③vo is the control signal output terminal, which
is triggered , causing vo to jump from low level to high level. It is a valid trigger, outside the output delay time n and without V.
When it jumps up, v0 is in a low level state. Pins ③ and ④, RRI, RC, l, are
the output terminals of the output delay time Tx, Tx ≈4 91521<, f.. Pins ⑤ and ⑥, RC2 and R R2, are the adjustment
terminals for triggering the blocking time Ti, T,-24Rz(,, pin ⑤vss, the negative terminal of the power supply, generally connected to ov. Pin ⑤ Pin VR√RESET is
the reference voltage and reset input terminal. It is generally connected to V㈨. When connected to ".", the timer can be reset. Pin ⑨ pin V
is the trigger prohibition terminal. When V.<V., triggering is prohibited; When v>V., triggering is allowed, VR≈
0 2Vrjo. Pin ⑩lB is the bias current setting terminal of the operational amplifier, via R around iMfl: connected to the V terminal
. Pin ⑩Vm, power supply terminal. Pin @ 20U'L, is the output terminal of the second-stage operational amplifier. Pin @
21N, is the inverting input terminal of the second-stage operational amplifier. Pin @1IN+, is the non-inverting input terminal of the first-stage operational amplifier
. Pin @ 11N, The inverting input terminal of the first-stage operational amplifier is. Pin ⑩10UT is
the output terminal of the first-stage operational amplifier. The C and S19508 integrated circuits that have the same functions as mssoooi     can
be used directly interchangeably.
, RP2 and R[． form a light control circuit . During the day, RL presents low resistance.
When the trigger prohibition terminal of Al is the level Vc<h (≈0 2Vnr,) of pin ⑧, it is trigger prohibition and Al is in reset state. Control
The second pin vo of the signal output terminal outputs low level, the transistor Wi is cut off, the homomorphic relay SSR is turned off, and the light E does not
light up. At night or when the ambient light is dark, the RI. resistance increases. When the first pin ⑨ of Al When the pin level Ve>V., Al
enters the waiting state, and the second pin of the output terminal vo is still low level. If someone
moves , the PIR will output an electrical signal that changes with the movement of the human body. Through RP1, it is sent to the input terminal 11N+ of the independent first
-stage high input impedance op amp inside the Al chip, which is the @th pin. After the preamplification, it is output by the ⑩ pin.