Test Procedure for the LV8411GREVB Evaluation Board For Stepper Motor Control Osclloscope Osclloscope CHANNEL CHANNEL 1 2 3 1 4 2 3 4 CURRENT PROBE AMPLIFIER 1 CURRENT PROBE AMPLIFIER 2 PROBE INPUT PROBE INPUT OUTPUT OUTPUT Stepping Motor Power supply2 A V - + Power supply1 A V - Function generator 1 + Function generator 2 Hz Hz CHANNEL 1 CHANNEL 2 1 2 Table1: Required Equipment Equipment Power supply1 Power supply2 Function generator Oscilloscope Current probe LV8411GR Evaluation Board Stepper Motor 1/8/2014 1 Efficiency 6V-1A 6V-0.5A 200kHz × 2unit 4 channel × 2unit 2unit 6V-0.5A www.onsemi.com Test Procedure: 1. Connect the test setup as shown above. 2. Set it according to the following specifications: Supply Voltage: • VM (2.7 to 5.5V): Power Supply for LSI • VCC (2.7 to 5.5V): Logic “High” voltage for toggle switch Toggle Switch State: • Upper Side: High (VCC) • Middle: Open, enable to external logic input • Lower Side: Low (GND) Operation Guide - You can drive stepper motor through 1-2 phase excitation mode by switching input signal as follows. In the case of stepper motor 2, switch IN5 to IN8 in the same way. IN1 H H H L L L L L 1/8/2014 INPUT IN2 IN3 L L L L L H L H H H H L H L L L Table2: Truth table OUTPUT IN4 OUT1 OUT2 OUT3 H H L L L H L OFF L H L H L OFF OFF H L L H H L L H OFF H L H L H OFF OFF L 2 OUT4 H OFF L L L OFF H H Position No. (1) (2) (3) (4) (5) (6) (7) (8) www.onsemi.com 3. Check the IN1, IN2, IN3, and IN4 terminal voltage at scope CH1 and CH2, and the output current waveform at scope CH3. INPUT Table3: Desired Results OUTPUT VM=5.0V VCC=5.0V IN1, IN2, IN3, and IN4 are switched every time of 1msec. The output current and rotation of the stepper motor is confirmed. 2ms/div IN1 5V/div IN2 5Vdiv IN3 5Vdiv IN4 5Vdiv IOUT12 50mAdiv 1/8/2014 3 www.onsemi.com