The product information

Small fan PCBA scheme

2022-03-30

Small fan PCBA scheme

Professional PCBA development in China

The principle of small fan is that the energized coil rotates under force in the magnetic field, and the electric energy is transformed into mechanical energy. The small fan has two engines with only pneumatic linkage and concentric shaft rotor, which is called double rotor turbofan engine. Its working principle and structural characteristics are basically the same as those of double rotor turbojet engine.
The design and development of Xiaofeng PCBA scheme is completed by brushless motor and main control chip:

There are three gear modes, l \ m \ h represents three operating gears, and the current operating mode is indicated by LED; Two keys, the red key is the shutdown key and the green key is the mode key; A lighting LED. The specific operation methods are as follows:

1. When you click the button on the right, the gear will be switched, including first gear, second gear, third gear, shutdown (sleep), and the LED will indicate the current gear in real time;
2. In any working mode, click the left button to shut down, the LED goes out and enters the sleep mode; In the shutdown state, when you click the left button, the LED will display the battery power in real time, turn off after 5 seconds and enter the sleep mode, and the sleep current is 1.2ua;
3. Long press the right button in any state, and the LED on the right will be on. Similarly, long press the right button in any state, and the LED will be off;
4. The charging indicator light will indicate with different colors during charging and after full charge;
The chip is a high-performance single chip microcomputer with 8-bit RISC architecture and 12 bit ADC. This small fan PCBA chip has 64 byte SRAM and simple peripheral configuration, which can meet the needs of multi-functional design on the premise of saving circuit cost. This single chip microcomputer has excellent ad measurement, including six reference voltages of internal 1.4V, 2.0V, 3.0V, 4.0V, Vdd and external input. It can realize the hardware level correction of internal reference voltage and one channel of 32mhz 12 bit PWM output. It is suitable for the development of products in many fields.
High performance RISC CPU
8-bit MCU
Built in 1K × 14 bit program memory OTP
64 byte data memory (SRAM)
There are only 42 single word instructions
Level 8 storage stack
Level 8 push and pop stack
Support ISP
Low power characteristics
MCU working current
- normal mode 0 23mA@fosc =2MHz,fcpu=1MHz,3V
- normal mode 6uA@32KHz ,3V

The current in sleep mode is less than 1 μ A