... SPIinterface.Main features of Brushless DC Fan Motor speed controller: Supply Voltage: 12~75VDCMax power: 200WSpeed control: 100% controllable ... be customized according to customer demands, such as Supply voltage range, No noise, hall-free, power,etc.Applications: External rotor ... brushless dc motor, EC motor, energy saving motor,etc. Low noise 48V BLDC Fan motor driver or controller with tach output