S4723MB is a switch dimming and color adjustment controller with state memory function. It has three control ports. It can realize three-segment switch dimming with memory by adjusting the current-limiting resistor of the constant current main control. It can also be used with a linear main control to control three light sources to realize three-way switch color adjustment with memory. The chip internally sets the state switching window time Tsw (typical value is 3.2S). If the light-off time exceeds the state switching window time, the chip will remember the state before turning off the light. When turning on the light next time, the state before turning off the light will be directly presented. If the light-off time is less than the state switching window time and then turning on the light, state adjustment can be realized, increasing the convenience of use. S4723MB judges the action of the input switch by detecting the AC signal and performs switch switching on the three control ports according to the detection result. The three control ports can drive MOSFETs and thyristors (for the linear color adjustment scheme, the low-cost solution can be realized by using our SCR093S with three built-in thyristors).