Hi ,
The project uses 3pcs DRV8860 to drive five stepper motors，There are some problem in in prototype debugging:
1. No output waveform without load
2. The same DRV8860 drives two stepper motors, with 1-4 feet normal and 5-8 feet abnormal
the Schematic as blew, the capacitance between drv8860 and MCU is not connected。Thanks!
Hi Rick,
It's five identical unipolar stepper motors, Pin definitions and electrical principles are shown in the figure.
The output range capture of motor in normal and abnormal operation is shown in the figure, The high-level very short captured pictures are abnormal working motors.
Hi Blanche,
Thank you for the additional information. Can you clarify the images provided?
The output range capture of motor in normal and abnormal operation is shown in the figure, The high-level very short captured pictures are abnormal working motors.
Added below is my understanding of how the image should be:
State 1 should be low (output on)
State 2 should be low (output on)
State 3 should be high (output off)
State 4 should be high (output off)
Repeat states 1 through 4
What output is captured in the first image? There are 4 repeating states in the image. Between states 4 and 1, the output appears to drive low then release.
Is the output supposed to drive low through state 1?
Does the nFAULT pin go low?
What is the resistance of motor from pins 2,5 to pins 1, 3, 4, and 6? Can this create an overcurrent event?
What is the signal captured in the second image?
