Datasheet

Motor Control Starter Kit User’s Guide
DS75015A-page 18 © 2011 Microchip Technology Inc.
The powerful PWM module allows easy control over the 3-phase BLDC motor. The
PWM module features three complementary output pairs, hardware Fault shutdown,
programmable dead time, among others. A standard 3-phase inverter is used to
interface the device and the motor.
Three ADC channels provide information of the motor’s BEMF by reading the voltage
on the motor windings. Three resistor networks scale the voltage in the range needed
by the ADC module.
A single-shunt topology is featured on this starter kit, which can be used for overcurrent
protection or for a single-shunt control algorithm.
The dsPIC33FJ16MC102 DSC also features three analog comparators. One internal
comparator is used to trigger the Fault function of the PWM module if an overcurrent.
The advantage of the internal comparator is that different software thresholds can be
used to implement overcurrent conditions on different motors.
The demonstration application accepts user inputs from two sources: the capacitive
slider, and the push button (S1). The device’s CTMU module works together with the
A/D Converter to sample and convert both the channels of the capacitive slider. Three
user LEDs are also available for various display combinations.
The 9V power supply provided with the kit is sufficient for running the demonstration
application in Stand-alone mode. In Debug mode, both the 9V power supply and the
USB connection must be used.
3.1 PROGRAMMER/DEBUGGER
The Motor Control Starter Kit includes an on-board programmer/debugger circuit that
provides connectivity over USB. This circuit is hard-wired to the dsPIC device to
provide ICSP™ debugging/programming capability.