Related Manuals for Eckstein komponente POLOLU STSPIN220
Summary of Contents for Eckstein komponente POLOLU STSPIN220
- Page 1 POLOLU STSPIN220 LOW-VOLTAGE STEPPER MOTOR DRIVER CARRIER USER’S GUIDE USING THE DRIVER Minimal wiring diagram for connecting a microcontroller to a STSPIN220 low-voltage stepper motor driver carrier https://eckstein-shop.de/...
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Page 2: Power Connections
Power connections The driver requires a logic supply voltage (3 – 5 V) to be connected across the VCC and GND pins and a motor supply voltage of 1.8 V to 10 V to be connected across VIN and GND. These supplies should have appropriate decoupling capacitors close to the board, and they should be capable of delivering the expected currents (peaks up to 3 A for the motor supply). - Page 3 and MODE2 are both driven low, which overrides the latched microstep setting and forces the driver into full-step mode. The previous microstep setting is restored once MODE1 or MODE2 is set high. There are nine step resolutions available as shown in the table below. The four MODE pins are floating, so they must be connected to logic high or low before operating the driver.
- Page 4 Control inputs and status outputs The rising edge of each pulse to the STEP (STCK) input corresponds to one microstep of the stepper motor in the direction selected by the DIR pin. Unlike most of our other stepper motor driver carriers, the STEP and DIR inputs are floating, so they must be connected to logic high or low to ensure proper operation.
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Page 5: Current Limiting
Jumpers for FLT and VREF pins on the STSPIN220 low-voltage stepper driver carrier. CURRENT LIMITING To achieve high step rates, the motor supply is typically higher than would be permissible without active current limiting. For instance, a typical stepper motor might have a maximum current rating of 1 A with a 5 Ω... - Page 6 Another way to set the current limit is to measure the VREF voltage and calculate the resulting current limit. The VREF pin voltage is accessible via a small hole that is circled on the bottom silkscreen of the circuit board. The current limit relates to VREF as follows: current limit=VREF×5 AV Like the FAULT pin, VREF can be connected to the pin labeled “(1)”...
- Page 7 Please note that measuring the current draw at the power supply will generally not provide an accurate measure of the coil current. Since the input voltage to the driver can be significantly higher than the coil voltage, the measured current on the power supply can be quite a bit lower than the coil current (the driver and coil basically act like a switching step-down power supply).