lThis fan is based on the NuMicro® M251 and can simultaneously control three fans along with RGB lights on the blades to achieve various visual effects. Fans are commonly used for cooling in graphics cards or computer cases, and their power consumption varies depending on usage. Therefore, the cooling fan needs to adjust its speed frequently. This solution ensures that the fan maintains the same lighting effect at different speeds, allowing for real-time control of the RGB lights' activation.

• Feature
  

  -	PWM-base RGB LED on fan blades
  	- The RGB LED on each individual fan is controlled by three independent PWM signals
  -	Detect fan speed and adjust PWM frequency at the same time
  	- A timer captures the fan‘s FG (TACH) signal to modify the PWM output frequency, to maintain consistent lighting effects
  -	Controlling Fan Speed Using Simulated PWM Signal with QSPI
  	- The QSPI MOSI with PDMA, is used to output PWM signals for controlling the fan speed

• Specifications
  

  M251(32-bit Arm® Cortex®-M23)
  -	Operating frequency up to 48 MHz
  -	Supports wide operating voltage range: 2.5V ~ 5.5V
  -	Supports up to 24 channels of PWM
  	(depending on the model)
  -	Supports up to 4 sets of Timer Capture
  -	Supports UART/I2C/SPI/PSIO interfaces

• System Block Diagram