1.Description:
EMC2101 is a fan controller with temperature monitoring function that will handle all of this for you. Programmable PWM output and tachometer input, with internal and external temperature sensing capabilities, with an accuracy of 1 ° C, making it the perfect friend for any 3 or 4-pin PC fan you may find.
The four pin PC fan has one power and ground pin (red and black), followed by two more pins. One of these additional pins, the PWM pin, allows you to set the speed of the fan. The last TACH pin is used for tachometer output, allowing EMC2101 to monitor the speed of the fan to ensure it operates as expected. This chip will handle all your affairs through daily I2C instead of using PWM outputs and counter inputs on the microcontroller.
In addition to allowing you to control the fan, EMC2101 also includes a connection for an internal temperature sensor and an external temperature sensing diode.
This simple small chip can be easily used to help provide cooling or ventilation for your next project. You can even use it to help quiet existing projects or crack noisy electronic devices with high fan noise. By allowing you to run the fan at a slower speed when cooling demand is moderate, EMC2101 can help reduce the vibration noise generated when the fan is running at full speed.

2.Feature:
1>.Low-power design
2>.Ultra small volume
3>.Simple and easy to operate

3.Parameter:
1>.Work Voltage: DC 3.3V-5V
2>.Size: 26*18mm

4.Package:
1>.1pcs EMC2101 I2C PC Fan Speed Controller