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Document: System Description Version Issue date: 1.0 Page 26.05.2012 6 of 14 5.2. Stepper Controller 5.2.1. A4899 Stepper motor driver Schematic drawing: Description Each Stepper controller is controlling one stepper motor; it is five stepper controllers on each MCC controlling the Nose wheel, rudder, right aileron, left aileron and the elevator. Function The stepper controller will amplify and convert a directional pulse from the PIC18F8520 to a current signal to the motor, controlling the speed and direction. The stepper controller will be enabled or disabled by the PIC18. And can be reset if desired. I/O specification Output: PIC18F8520 Input: A4899 Ref: MCC Card configuration STEP Ref: MCC Card configuration RESET Ref: MCC Card configuration DIR Ref: MCC Card configuration ENABLE 13.8V VMOT GND GND 5V VDD GND GND Output: A4988 Stepper motor: 1A Red 1B Yellow 2A Orange 2B Blue Vin & Imax 8 – 35 Vin & maximum 2A per coil (2 coils = 4A) MTBF 31,784.5 hours Price 12.95 USD References 7.1.1.5 data sheet of the A4988 Author / date A.G and R.L 07.03.2012
