YH01 lighting control application specific integrated circuit

VD2 ~ VD5 and vs form the main circuit of the desk lamp H, and the integrated block and related components form the control circuit of the light switch. VDI,
VD6, Rl and C4 form a resistor step-down half-wave rectification and voltage stabilizing circuit, which outputs a DC voltage around Sv for powering the integrated block.
    When the power is just turned on, the 6-pin-cleared input terminal R of A receives a positive pulse signal due to C3 charging, the circuit is cleared and
reset, and the output terminal Q, i.e., 5-pin, outputs a low level , so the thyristor vs. no trigger signal is in In the off state, the light does not light up.
This ensures that every time the power is restored after a power outage, the light will be extinguished. When you need to turn on the light, just touch the electrode sheet M.
The clutter signal induced by the human body is input to the l pin, the IN terminal, through R6 and R5. The circuit state flips, Q outputs high level,
and vs obtains the forward trigger current through R2. Turn on, the lamp H is energized and emits light. The light-on time Tm
is determined by the value of the external resistor Rx and capacitor Cx of pin 2 of A. It can be roughly estimated by the formula Tm=5RX Cx. When Rx is 1MO and Cx is 10uF, then
Tm=50s. After 50s, the integrated block A is reset, the Q terminal returns to low level, vs loses the trigger voltage, and when the alternating current crosses zero
, it turns off and the light goes out. This is a delay switch, suitable for going to bed at night. If pin 2 is directly connected to the ground (
shown as the dotted line in Figure 2-29), it is in the locked state. Touch the electrode M once and the level of 0 changes once, and
the functions of touch on and touch off can be realized. Pin 3 of the integrated block is the logic positive output terminal Q, and its level change pattern is exactly
opposite When the Q terminal is high level, the Q terminal is low level: when the Q terminal is low level, The Q terminal is high level . Pin 3 of this circuit is left
unused and readers can use it to drive other lines for touch control.