November 4, 2009 21
Hardware Description
Key components in the reference design include a Stellaris LM3S617 microcontroller with an ARM
Cortex-M3 core and a power stage consisting of Fairchild Semiconductor’s gate drivers and
MOSFETs. Other complementary components complete the design by providing protection, signal
acquisition, and power supply functions. The entire circuit is built on a simple two-layer printed
circuit board (see Figure 3-1). All design files are provided in the RDK CD.
Figure 3-1. Stepper Motor Control RDK Layout
USB Interface
Gate Drivers
Mode Switch
Speed Pot
DC Bus Capacitors
Fuse
DC Power In
Output to Motor
Stellaris Microcontroller
Fairchild MOSFETs
Power Supplies
JTAG Port
CHAPTER 3
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