Stepper motors are usually defined with step angle or step number parameters. Generally, one revolution of the motor is divided into 200 steps, that is, the step angle is 1.8 degrees. EasyDriver has the step distance subdivision function, the subdivision of this driver board It is 8 subdivision, that is, each step of the motor is subdivided into 8 small steps, so that more precise control can be obtained, which means that EasyDriver needs 1600 steps to complete a complete 360-degree rotation.
ms1 and ms2 are the logic input ports for stepping motor subdivision resolution selection;
dir is the port for selecting the direction of motor rotation;
reset is used to reset the initial value of the chip and shield all external outputs;
step is the pulse input port;
out1a, out1b, out2a, and out2b are the two pairs of output ports of the h bridge;
enable is the enable terminal;
sleep is sleep mode;
sense1 and sense2 are the current sense resistors of the h bridge;
ref is the reference voltage;
gnd is logic ground and power ground;
rc1 and rc2 are analog inputs for the h-bridge fixed cut-off time.
a3967slb pwm constant current control micro-step driving two-phase stepper motor dedicated driver. Its working voltage can reach 30v, and the drive current can reach 750ma. One a3967slb can drive a two-phase stepper motor, which can realize 8 subdivision drive. The pwm current control circuit inside the chip can be set to three current decay modes: slow, fast, and mixed by the voltage applied to the pfd. If the voltage at the pfd end is higher than 0.6vdd, the slow decay mode is selected. If it is lower than 0.21vdd, select fast decay mode. Between the two is the mixed attenuation mode. In addition, a3967slb can also provide complete protection measures, including suppression of transient voltage, overheating protection, prevention of current through, under-voltage self-locking and other functions.
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