CS7232 touch stepless dimming light circuit (1)

It is a touch-type stepless dimming lamp made of S7232 dimming special integrated circuit. Touch M
to steplessly dim
the brightness of bulb E.     CS7232 is
manufactured using MOS technology and can operate
at a voltage of 3-12V
, with a typical operating voltage
of 5V. The chip is packaged in
a standard DJP-8 package, and the functions of each
pin are as follows. Pin
① is V..., power supply Positive
terminal. Pin ②D()ZE,
⑤ pin SEN, ⑥ pin
SLAVE are all phase shift control
input terminals, ⑤ pin is the touch control input terminal, the hand touch signal passes through R. High value resistor input, when touching
Within 39-399ms, the sky lanterns are turned on. If the touch time is greater than 399ms (approximately 4s), the lights
or dimming are completed. Press and hold the touch pad M for a long time, and the light brightness will automatically fade from dark to bright again. The light gradually dims, and when 4rl thinks it is appropriate,
let go. The brightness is determined. If you want to turn off the light, just touch it briefly (less than 0 4s). Then
touch it (less than 0 4s) to turn on the light again, and keep The brightness is set by the original. The function of pin ⑥ is similar to that of pin ⑤, but
it is equipped with special logic inside. When it is used for long-distance control, it is not easily disturbed by T' and causes malfunction.
Pin ④SYN is for power frequency synchronization. The input is locked by the internal PI.I. and serves as the zero-phase reference for the output trigger pulse of the phase shift circuit and brightness memory circuit
. Pin ⑧ is CAP, which is the external terminal of the low-pass filter
capacitor Pin OV is the negative terminal of the power supply. Pin ⑧OU1, is the trigger pulse output terminal and must drive the thyristor
. SM7232, NR7232, etc. have the same functions as rS7232, and they can be
used directly interchangeably.
    VD1, vs, R- and C. form a resistor step-down half-wave rectification and stabilizing circuit , and output Sv current to supply power to
C S7232. R: Provides synchronization signal for ④ pin, (j filters out peak pulse interference, G is sufficient The PLL filter circuit
is discarded, and R provides the trigger signal for the thyristor VTH. The resistance value will affect the touch sensitivity, and it can generally
be selected between 220-680kn.