M668 touch step dimming light circuit

The touch-type stepping light made by Caichuan M6 68 integrated circuit has the characteristics of a waste circuit and is sufficient for the dimmer. It
adopts a two-wire connection method and has
only two external lead wires. Therefore,
it directly replaces the ordinary lighting
+|= off and turns the ordinary lighting off. The lamp
is made of a touch-sensitive lamp called Block Diao
/Qizhou.
    M6C, 8 is
manufactured using Sichuan CMOS process, standard DIP-8
package, the functions of each pin are as follows.
Pin ① is the power fish terminal vs. .
Pin ② is the touch signal input
terminal SFVN. Pin ③ is the keying
terminal KJ. Pin ④ is the Ding operation mode selection terminal wr. When the ④ pin is connected to the ground (i.e. vs;), it is the light-blocking
mode; when the ④ pin is connected to the positive terminal VDJ, UJ of the power supply, it is the on-off switch operation mode. Pin ⑤ is the synchronization signal input terminal S, _N. Pin ⑥ is
the internal oscillator of the circuit and is connected to the external resistor-capacitor terminal LH1. Pin ⑦ is the pulse signal output terminal rR, which is used to trigger the thyristor. Pin ‰ and l
are the power termination terminal ‰. The power supply voltage range used by M66 is 3-7V.
    In vain. V【)l- V1)4 and VT form the main return hoof of the electric lamp E, and the control loop M668 is composed of it.
vs.R. and (1) to form a resistor step-down voltage stabilizing circuit, which outputs a self-current voltage of about 6V for power consumption of the integrated block. The light-emitting
tube LED is a low-light indicator, which is convenient for finding the opening position at night. If you need a low-light indicator, you can The short wire
connects the two solder joints of the LED. R. and R. form a voltage divider to provide a synchronization signal for the ⑤ pin of the integrated block.
(The second is the pulse output capacitor of the integrated block, which adds the pulse to the gate of the pin tube VlI. The extremely precise lead angle of wr
enables four-level brightness control. R is a high-resistance safety resistor to ensure the safety of others. When a person r touches
the electrode sheet M once, the clutter signal induced by the human body After R, it is added to the input terminal of the integrated block. After SE\ is processed by the internal
circuit , the ⑦ pin outputs a series of pulse signals Yi (1.) and is sent to the gate of VT to control the conduction angle of VT
and make the brightness of the bulb according to the : Low light, medium light, brightest, off... four gears change cyclically
. The VT conduction angle at the maximum brightness is 1 50. If the ④ pin of M668 is not grounded and is connected to the ⑧ pin instead, the power will That is, it is a single
touch light that does not turn off and has no dimming function.