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Eckstein komponente POLOLU A4988 User Manual

Stepper motor driver
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POLOLU A4988 STEPPER MOTOR DRIVER
CARRIER
USER'S GUIDE
USING THE DRIVER
Minimal wiring diagram for connecting a microcontroller to an A4988 stepper motor
driver carrier (full-step mode).
POWER CONNECTIONS
The driver requires a logic supply voltage (3 – 5.5 V) to be connected across the VDD
and GND pins and a motor supply voltage (8 – 35 V) to be connected across VMOT 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 4 A for the
motor supply).
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Summary of Contents for Eckstein komponente POLOLU A4988

  • Page 1 POLOLU A4988 STEPPER MOTOR DRIVER CARRIER USER’S GUIDE USING THE DRIVER Minimal wiring diagram for connecting a microcontroller to an A4988 stepper motor driver carrier (full-step mode). POWER CONNECTIONS The driver requires a logic supply voltage (3 – 5.5 V) to be connected across the VDD and GND pins and a motor supply voltage (8 –...

  • Page 2: Motor Connections

    Warning: This carrier board uses low-ESR ceramic capacitors, which makes it susceptible to destructive LC voltage spikes, especially when using power leads longer than a few inches. Under the right conditions, these spikes can exceed the 35 V maximum voltage rating for the A4988 and permanently damage the board, even when the motor supply voltage is as low as 12 V.

  • Page 3: Control Inputs

    microstep modes to function correctly, the current limit must be set low enough (see below) so that current limiting gets engaged. Otherwise, the intermediate current levels will not be correctly maintained, and the motor will skip microsteps. Microstep Resolution Full step High Half step High...
  • Page 4 The A4988 supports such active current limiting, and the trimmer potentiometer on the board can be used to set the current limit. One way to set the current limit is to put the driver into full-step mode and measure the current running through a single motor coil while adjusting the current limit potentiometer.
  • Page 5 2017, which makes more of the adjustment potentiometer’s range useful. The following picture shows how to identify which current sense resistors your board has: Identification of original 50 mΩ sense resistors (left) and 68 mΩ sense resistors (right) introduced in January 2017. So, for example, if you want to set the current limit to 1 A and you have a board with 68 mΩ...
  • Page 6 POWER DISSIPATION CONSIDERATIONS The A4988 driver IC has a maximum current rating of 2 A per coil, but the actual current you can deliver depends on how well you can keep the IC cool. The carrier’s printed circuit board is designed to draw heat out of the IC, but to supply more than approximately 1 A per coil, a heat sink or other cooling method is required.

  • Page 7: Schematic Diagram

    SCHEMATIC DIAGRAM Schematic diagram of the A4988 stepper motor driver carrier (both green and black editions). Note: This board is a drop-in replacement for our original (and now discontinued) A4983 stepper motor driver carrier. The newer A4988 offers overcurrent protection and has an internal 100k pull-down on the MS1 microstep selection pin, but it is otherwise virtually identical to the A4983.