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The Bipolar Stepper Add-on Board
2012 Microchip Technology Inc. DS41629A-page 35
FIGURE 4-1: THE BIPOLAR STEPPER MOTOR CONTROL ADD-ON ARCHITECTURE
4.4.2 Attaching the Motor
The bipolar stepper add-on kit includes the two-phase Leadshine 39HS02 bipolar step-
per motor. The supplied motor is pre-wired to a connector that mates with J3 of the
add-on board. The connector is designed to accept 26 AWG wire. Connector terminals
5 and 6, that mate with the board pins 2 and 1 respectively, may be used to wire in a
lab supply in lieu of power connector J2. Use of a lab supply with a current monitor is
recommended as an aid during parameter optimization.
4.4.3 Power-Up
Power is supplied through either the J2 2.5 mm power jack or the power pins of J3. The
default motor parameters assume that the supply voltage is 9 V
DC. Changing the sup-
ply voltage will require re-optimizing the motor parameters. Monitoring the supply cur-
rent during optimization is highly recommended to prevent over driving the motor.
The F1 LV Evaluation Platform must be configured to use expansion board power by
inserting the power jumper on J6. See the “F1 LV Evaluation Platform for Enhanced
PIC
®
Microcontrollers User’s Guide” (DS41614).
4.4.4 Power Stage
The unipolar stepper add-on incorporates the classic two H-bridges drive consisting of
four N-type and four P-type MOSFETs. The maximum current rating is 8A on each
MOSFET. Please keep this in mind when designing your application or modifying the
add-on hardware.