RE: DRV8825: Irregularities in output waveform

Hello jcarter,

Thank you for the clarification. I see the thermal PAD which connects to the GND is missing, it is recommended to have that thermal Pad to remove heat. One thing we can try is to lower the current so see if that is one of the problems.
Could you please try running your motor around 300mA, that would let us see if the fault is due to an OTS event because of not enough heat dissipation.
Also, Could you please clarify your captures above. I see the red waveform has an offset of 6V, is this correct? if so this could also be a problem.
What pins are you capturing? Could you also monitor the nFault pin please and share your captures?
The other capture (only blue waveform) shows that maybe even the revA could be having a problem. Could you please add a larger capacitor than 4.7uF? Please also share that capture and let me know what pins exactly you are monitoring. I hope this helps, thank you very much.