One chip realizes functions such as spray 𞓜 ws2812 drive | key touch | LED display | voice broadcast chip and simplifies the design of humidifier products

        Humidifier , It is a consumer electronic product commonly used in our home , Spray device. 、 Key touch key 、LED Display driver chip 、 Voice broadcast chip and other components are combined and designed , Integrated circuits involved ic many , It means that the circuit is complex , comprehensive BOM The high cost , Low production efficiency , And the chip we introduced today WT2003H B007, It's a collection spray designed by Shenzhen's Chuang Yin electronics. 、WS2812 drive 、 Touch the button 、LED Display drive 、 Multi in one integrated chip with voice broadcasting and other functions , The birth of this chip greatly simplifies the design of atomizer products , Reduce synthesis BOM cost , Make product design faster and more convenient .

First of all, let's take a look at the overall schematic diagram ：

Let's introduce the functions of the product in parts

Realization of spray part ：

Don't look at this little simple circuit , At that time, I saw why two triodes were used to drive mos tube , Until one day I read such an article, I understood

Here, the atomization module mainly needs 3M Frequency to drive, otherwise this function cannot be realized , It takes the longest time , Follow PCB Layout and heat dissipation have a great relationship , And can't touch too close .

WS2812 The implementation of the ：

This drive RGB Everyone should be familiar with the lamp beads , His main difficulties are known to everyone. His timing requirements are very fast , General MCU It's still hard to be present , As we can run 160M The main frequency of the voice chip also has some difficulties , Because our voice chip wants to simulate a NS level IO It's difficult to flip the mouth .

 

 

About WS2812 That's all about the drivers of , This method is sure to be realized and very stable , You can drive as many lights as you want , The cost of selling this driver module in the market is still relatively high ,WT2003H B007 The voice chip has been standardized in this driver , The desired effect can be achieved through a simple serial port , High cost performance .

Touch the button ：

For this project WT2003H B007 The voice chip realizes 6 A touch key function , I won't elaborate too much on this . By calculating the discharge time after full charge, it can be obtained whether there is a press ,WT2003H B007 Now there is a click 、 double-click 、 Long press and other functions , Of course, we also did algorithm processing here , Now the use experience is also very good .

LED Show ：

WT2003H B007 Here is the driver 8 individual LED, It only took 4 individual IO complete 8 individual LED drive , Adopted IO Have 3 State function , Use dynamic scanning mode , The driver is realized 8 individual LED The function of .

Voice broadcast function , We won't go into details here , For details, please refer to WT2003H Voice chip description document .

As a high-tech enterprise focusing on voice technology research , Always adhere to “ Good service engineers ” Target , Take the standardization of voice interaction devices in the industry as the direction , Committed to making complexity simple , Provide fast voice 、 Intelligent Internet of things application solutions .WT2003H B007 Application design , On the smart alarm clock 、 Smart water cup 、 There are mature application cases in the field of consumer electronics such as atomizer . The application of consumer electronic products is an important development field of the company , future , Weichuang Zhiyin will launch standardized voice chips in more industries , Further enhance the design experience of Engineers , Enabling standardization in the consumer electronics industry .